Research as an essential DDCR management tool
Current research projects
The research we conduct at DDCR enables us to make management decisions based on sound scientific principles. It also provides baseline data for future surveys and studies.
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Quantitative analysis of the hyper-arid vegetation changes under grazing in Dubai Desert Conservation Reserve
Quantitative analysis of the hyper-arid vegetation changes under grazing in Dubai Desert Conservation Reserve
Aims
To implement a continuous practical and efficient vegetation monitoring program by applying analytical tools for effective data interpretations. As vegetation is the base of the food pyramid the expected data and information is indispensable for managing the ecology of the Dubai Desert Conservation Reserve.
Goals
To evaluate the current state of the DDCR vegetation, the study is focuses on the assessment of density, cover, and biodiversity of the flora in the DDCR and follows the continued monitoring and repeated vegetation studies of 2004 (El Alqamy, 2004) and 2009 (Khafaga, 2009). To present the results through the mapping of the vegetation and by defining the lineage between different floral communities, using multivariate analysis combined with GIS techniques.
Methodology
Using the plot sampling method at 302 randomly selected sites, at each site, a circular plot is adapted for sampling the vegetation with an area of 50m diameter and each plot in total is equivalent to 7850m2. (Khafaga, 2009)
Plant species in each given plot are tentatively recorded in the field and put in tabulated form, giving the authentication of their identification with the help of the floristic books.
For each species total number of individuals are counted and an average size (length x width x height) is calculated.
To achieve the goal, data interpretation will require the adoption of the following strategies:
- Floristic composition and phytosociology- Density and Relative Density
- Abundance and Relative Abundance
- Frequency and Relative Frequency
- Cover and Relative Cover
- Important Value Index (Species Dominance).
- Diversity Indices- Simpson Dominance Index
- Shannon Diversity Index
- Margalef Richness Index
- Spatiotemporal variation of plant communities- The calculation of the values of the diversity indices of individual plots over different habitats will interpolate predicted variety in un-sampled areas and will produce an overall picture of how diversity is changing over the entire DDCR.
Expected outcomes
The anticipated results will encompass three main themes. These are:
- Assessing species diversity and variability of the DDCR flora.
- Comparison of floral communities in different habitats, specifically comparing the populations of Gravel Plains against those of Sand Dunes.
- Examining the vegetation diversity through various monitoring events and with altered adverse pressure and climatic factors.
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Changes in functional diversity under grazing pressure in hyperarid shrubland ecosystem
Changes in functional diversity under grazing pressure in hyperarid shrubland ecosystem
Aims
To investigate the term Functional diversity “a variety of life-history traits presented by an assemblage of organisms” with regards to the vegetation diversity of DDCR. It has been postulated to be critical for the maintenance of ecosystem processes and properties.
The conceptual linkages between ecosystem disturbance, species diversity and functional diversity are fundamental to resource management and conservation planning.Goals
To study the changes in intensity and timing of grazing and its effect on the changes in taxonomical and functional composition and subsequent changes in ecosystem functioning. These changes will explain the great interest in monitoring the impact of grazing on plant communities for the purpose of preserving their biodiversity and economic or aesthetic values.
Methodology
- Divide the reserve into three sectors (North, Centre and South).
- In each area, randomly select 25 sites for each habitat types (Gravel Plains and Sand Dunes), 150 sites in total.
- Build a matrix of different vegetation Functional traits for various monitoring times (2009 & 2017).
- Choose 24 “Functional Traits” to study the effect of grazing on vegetation and measure the response diversity in DDCR ecosystem.
- All attributes values will be recorded from published sources and herbarium information, except for the “plant heights” trait which will be measured in the field or collected from previous measured field studies.
- Anova and Diversity indices will be applied.
Expected outcomes
- A set of complete functional traits of DDCR.
- The change of the vegetation functional traits between different grazing pressures.
- A prediction of which functional character are more resilient and less vulnerable to any disturbances.
- Assessment of the changes in the diversity responses along a grazing gradient (the spatial variation of disturbance intensity).
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Monitoring of the Arabian Oryx (Oryx leucoryx) in the Dubai Desert Conservation Reserve
Monitoring of the Arabian Oryx (Oryx leucoryx) in the Dubai Desert Conservation Reserve
Aims
To gain an understanding of the ecology of the Arabian Oryx within the DDCR, in particular we will look to determine their home range and which habitats, within that home range, they prefer and finally which plant species they utilize within that habitat.
Goals
- Gain a better understanding on the movements of Arabian Oryx through the use of GPS collars and so collect data on their home range and habitat selection.
- Gather data on activity patterns (i.e. time spent grazing, resting or moving) of the Arabian oryx in relation to factors such as habitat, temperature, sex and life phase.
- Gain an understanding of the dependence of the Oryx herd to the provided feed and how this can affect there behavioural and distributional patterns.
- Study the grazing habitats of the Arabian Oryx to establish grazing preferences in relation to plant species and growth form.
Methodology
- Eight Arabian Oryx, representing approximately 2% of the reserve population and consisting of four males and four females, will be selected from eight different herds geographically spread across the DDCR.
- The Oryx will be chemically immobilized and fitted with a GSM-GPS collar which will record the GPS location of the Oryx every two hours in addition an activity sensor records some behaviour such as grazing or resting. Collars should be active for three years before dropping off.
- Data from the collars will be transmitted, via GSM signal, to a base station collation and analysis.
- Current GPS locations and activity data (i.e. grazing periods), as well as VHF signals will be used to track the Oryx to ascertain their preferred fodder species.
Expected Output
Data from the collars will be analysed to establish home range, habitat preference and activity patterns in relation to factors such as sex, life phase and temperature. Furthermore by actively tracking Oryx in relation to grazing activity we will gain an understanding of habitat use and in particular plant forage preferences. By understanding the movement and habitat use of the Arabian Oryx, our largest herbivore, we will gain a better understanding of the herbivore carrying capacity of the DDCR and thereby make the correct management decision to prevent overgrazing and habitat degradation.
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Monitoring of arid rangeland ecology using Unmanned Aerial Vehicles (UAVs) Desert Drones over Dubai
Monitoring of arid rangeland ecology using Unmanned Aerial Vehicles (UAVs) Desert Drones over Dubai
Aims
To establish a base in this emerging field within DDCR for the civilian use of aerial photography from Unmanned Aerial Vehicles (UAVs) and demonstrating its values for arid rangelands conservation.
Goals
Collecting accurate, inexpensive data to:
- Monitor grazing pressure on rangelands, and estimate botanic health of an arid ecosystem.
- Estimate and monitor the population of protected and endangered species
- Arabian Oryx, gazelle species, foxes, Gordon’s wild cats, Houbara bustard, birds of prey and Spiny-tailed lizards.
- Feral and invasive species, e.g. Prosopis juliflora.
- Evaluating the extent of damage caused by off-road recreational driving.
- Increasing the accuracy of ecological maps and consequently habitat classifications.
Methodology
After having the full set (Drone + Software) flights will be strictly limited to the 225km2 DDCR to avoid legal and privacy issues.
- Calibrating the airborne equipment over different altitudes, time of day and meteorological parameters to assess its abilities and limitations.
- Routine monitoring at selected elevations, to obtain spatio-temporal data of plant species and dune structure and possibly of some animals.
Each designated flight pattern will be recorded once per week for a year.
Expected Output
Temporal / Spatial baseline data of vegetation and dune change, related to topographic data; if the opportunity arises to study ephemeral species, then spatial distribution and growth of ephemerals over their lifespan.
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Camera Trap Survey of the Dubai Desert Conservation Reserve
Camera Trap Survey of the Dubai Desert Conservation Reserve
Aims
As many species within desert environments are both nocturnal and elusive, it is difficult to gather reliable information on their populations. A camera trap is a camera that triggers when an animal passes in front of an infrared and motion detector. This has the advantage of detecting, with equal efficiency, both nocturnal and diurnal activities while having minimal environmental disturbance. The camera trap survey aims at recording the presence (or absence) of elusive and nocturnal species, in particular the smaller carnivores, within the DDCR.
Goals
- To collect photographic records from the deployed camera traps that can be used for analysis to establish species distribution and population size of the target species; Arabian Red Fox (Vulpes vulpes arabica), Sand Fox (Vulpes ruepelli), Gordon’s Wildcat (Felis silvestris gordoni) and Sand cat (Felis margarita).
- Determine which feral species are present and where are they concentrated.
- Identify and document all species recorded by the camera traps.
Methodology
- Nine camera traps, five Reconyx Rapid Fire and four Bushnell Trophy Cams, are deployed from the November 2010 until November 2011, into the five habitat types across the DDCR; Gravel Plains, Sandy Plains, Vegetated Sand Dunes, Shifting Sand Dunes and Rocky outcrop.
- Data, which includes photographs as well as date and time of the event, is collected from the camera traps every fortnightly. At the same time the locations are baited to attract the target species.
- The photographs are classified according content and species, if any animal was recorded. These classifications are then added to a spreadsheet with the other data, location, date and time.
Expected Output
- The establishment of either the presence or absence of the target species within the DDCR.
- Through statistical analysis of the data collected an estimation of the population size of the target species.
- On the basis of the data collected from the camera traps, maps of the record species distribution and density across the reserve.
- Habitat preference of all recorded species as well as information on patterns of activity of these species.
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Assessment of Forage Productivity and Carrying Capacity
Assessment of Forage Productivity and Carrying Capacity
Aims
To investigate and recommend strategies, to manage and restore the rangelands and conserve their biodiversity in the Dubai Desert Conservation Reserve.
Goals
- Quantification of the forage productivity and evaluation of impact of important determining factors, such as soil and rainfall.
- Estimation of the rangelands carrying capacity, that is, the maximum possible stocking of livestock that a rangeland can support on a sustainable basis.
- Assessing the response of soil and vegetation to different grazing management practices for optimal rangeland use.
- Assessment of the possibility of restoring the degraded rangelands with indigenous forage plants and defining the most appropriate conditions for this process.
Methodology
- Site selection, sampling and environmental measurements.
- Estimation of forage productivity and carrying capacity.
- Building a model of the relationship between environmental factors and carrying capacity.
- Assessing the response of soil and vegetation to different grazing management practices for optimal rangeland use.
- Enclosures will be established.
- Number of plots will be located in each enclosure.
- Within each quadrate, the following plant community attributes will be recorded:
- A list for all the available species.
- Species density (number of individuals per unit area).
- Species frequency.
- Species cover (for perennials).
- Importance values (summation of relative frequency, relative density and relative cover) will be calculated for perennials.
- Species richness and diversity.
- Soil samples will be collected to measure its physical and chemical properties.
- Recovery of different species will be assessed in each enclosure.
Expected Output
- Development of management strategies and decision tools to proactively manage livestock grazing and reduce the drought impacts on plant community structure and function.
- Building a model that could predict the carrying capacity in any season or region.
- The rehabilitated sites would create more appropriate micro-habitats suitable for the reintroduction of some endangered or extinct in nature indigenous wildlife of the UAE.
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Fixed Point Photography
Fixed Point Photography
Aims
To maintain a visual record of the different habitat types within the Dubai Desert Conservation Reserve.
Goals
- To have a series of standardized photographs, which can be compared on a season to season and year to year basis.
- Corresponding data on the fauna and flora of each site that can be used to gain a better understanding of the visual changes at each location.
Methodology
- Nineteen locations across four main habitat types of the DDCR were selected for a fixed-point photography project.
- A 360° view of each point will be photographed in the winter and summer of each year.
- At the same time, each point will have a rapid survey conducted on the area photographed, which will collect data on the diversity and abundance of fauna and flora.
Expected Output
- A visual record of the changes that occur to the different habitats within the DDCR, that can be explained by environmental factors (rainfall, temperature etc.) or management decisions (stocking rate, land use etc.). This could then be used as a tool for future decision making.
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Macqueen’s Bustard Re-introduction
Macqueen’s Bustard Re-introduction
Aims
In a project done in conjunction with the National Avian Research Centre (NARC) and the office of HH Sheik Mohammed bin Rashid al Maktoum, Macqueen’s Bustard are to be re-introduced into Dubai Desert Conservation Reserve.
Goals
- To supplement the wild population, which migrate through the UAE, of this species that is classified, on the IUCN Red Data List, as vulnerable through rapid population decline.
Methodology
- Macqueen’s Bustards are captive bred in the National Avian Research Centre and reared to adulthood, before being transported to the DDCR.
- The bustards are release into the DDCR by one of two methods.
- Soft Release: The bustards are allowed to acclimatize to the area for one month in specially built cages before being released.
- Hard Release: The Bustards are released directly into the desert.
- Satellite tracked bustards are monitored via regular downloads and records kept of their movements.
Progress to Date
- The first release of 29 Macqueen’s bustards were released into the DDCR on the 25 February 2010. 15 bustards, including 3 with satellite tracking, were hard released directly into the desert in the South of the DDCR. While a further 14, including 3 with satellite tracking, were soft released near Tawi Ruwayyan after spending 1 month in cages erected on the release site.
- Since the first release an annual release of Macqueen’s Bustard has taken place except for in 2011.
- A total of 3101 individuals have been released with an approximate 1:1, male:female ratio up until the January 2020 release.
- 106 Macqueen’s Bustards have been tagged with GPS trackers and their movements studied by the National Avian Research Centre.
- Since 2010 breeding has been recorded in the DDCR through four nests with eggs being found and one female with chicks observed.
- Regular sightings of Macqueen’s bustards without satellite tracking are report by the DDCR staff, including a male doing a mating display.
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Seasonal Dynamics of Herd Structure of Re-introduced Arabian Oryx in the Dubai Desert Conservation Reserve, United Arabian Emirates
Seasonal Dynamics of Herd Structure of Re-introduced Arabian Oryx in the Dubai Desert Conservation Reserve, United Arabian Emirates
Project Summary
Arabian Oryx (Oryx leucoryx, Pallas, 1777) is the largest species of antelope on the Arabian Peninsula. This magnificent animal was only saved from extinction through a captive breeding program and reintroduction to the wild. In Dubai Desert Conservation Reserve (UAE) antelope was successfully re-introduced in the 1999. Already in 2011 status of Arabian Oryx according to the IUCN Red List was changed from “Extinct in the wild” to “Vulnerable”.
Until 2019, the population of Arabian Oryx on the area of Conservation Reserve substantially increased (Lignereux, Alzahlawi, Al Kharusi and Pesci, 2018), however the knowledge on the dynamics in time and seasons is limited. Monitoring species abundance and distribution is a prerequisite when assessing species status and population viability. That is why the present research is needed. To describe the dynamics of Arabian Oryx population around feeding points, water holes, and on natural location (untouched); to understand the herd structure and influences driven by natural or artificial factors – all these are essential for successful development of management plan of protected area.
The main goal of the project is to identify the population dynamics over a selected time in relation to seasons, climatic conditions, locations and management measures (i.e. mobile feeding and water points). The period between 2009 and 2019 will be the main focus of the research. This timescale has close connection to present condition of the animal population and will help to prognoses the future population trend.Research Objectives
- To identify density changes of re-introduced semi-wild population of Arabian oryx on the area of DDCR for the period 2009-2019.
- To treat available data from DDCR archive: images from camera traps, bio expedition reports; personal observation reports; climate stations.
- To identify the herd structure and activity patterns using the data from camera traps at different type of location within DDCR for the period 2009-2019.
- To interpret the Arabian oryx density and herd structure in relation to climate events using the data from climate stations throughout the investigated period.
- To analyze the continuos data from 2011 year with random camera trap distribution to determine the population dynamics. Compare population trends with discrete data from other years and locations.
Methodology
- In 2019, there are approx. 400 Arabian Oryx on the territory of DDCR. Eight of them have been equipped by GPS-collars, data from which are archived in the database of the DDCR. There is a collection of about 10,000 images from camera traps for the period from 2009 - 2019. Among these images, photos of Arabian Oryx will be identified and analyzed using custom computer based learning TensorFlow API and Python, Imagej, and CLIQS software packages. In the first stage of data processing, data from camera traps and climate station for the winter months 2019 will be mined and analyzed. Parameters such as number of individuals on the picture, their sex and age class (adult vs. calf), and activity will be recoded. The first analyze will show which approach and software design is the most suitable to reach the project goal.
- Personal observation at feeding and water stations will verify the assumptions about the herd structure and interpretations of activities recorded on pictures. To increase personal experience and gain real practical knowledge, skills and attitudes field work will be consisting of: bio expedition experience (non-invasive monitoring of animal), weekly observation and calculation of Arabian Oryx at DDCR, study visits to local centers, where Arabian Oryx breed in captivity. To understand the terrain characteristic in real time (and as result - cover more behavioral patterns within different climatic conditions) field work will be splitted into 2 periods: summer and winter. Personal present in the office of DDCR will be helpful as well during the computing analyze of data with supervision of DDCR experts.
- Data from climate stations will provide information about the regular climate pattern and unusual climatic events on the territory from 2009-2019. The animal density dynamics will be tested for the effects of climatic parameters using relevant statistical procedures. Finally, the results of animal density and spatial distribution of feeding and water points will be visualized using tools in ArcGIS Pro software (e.g. Space Time Cube).
- Understanding of seasonal dynamic of herd structure and its dependence on natural, artificial factors will provide DDCR team with essential information for further managerial decisions.
- The analyze of managerial decisions (dislocation of feeding points) in the period of 2009-2019 will help to create the map of already-used and non-used plots on the DDCR area. This map will give a base to conservation management plan for future decision.
Expected Outcomes
- Information about seasonal dynamic of herd structure for the period 2009-2019 will be analyzed and prognosis of future population dynamic will be formulated. Effects of climate conditions on animal dynamics throughout the time period (2009-2019) will be visualized via Space Time Cube in ArcMap.
- Data findings at completion will be presented to the research committee in the form of presentation.
- Research results, as well as general research project outline will be organized as visual content of digital poster. Poster can be published on official website, media channels of DDCR.
- The recommendation to Management Conservation Plan will be made, based on the information about seasonal dynamic of herd structure and its dependence on natural, artificial factors.
- Final results of research will be presented to the academic community of Czech University of Life Science (Prague) in the form of presentation.
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The Genetic Study of the Arabian Oryx Population in Dubai, United Arab Emirates
The Genetic Study of the Arabian Oryx Population in Dubai, United Arab Emirates
Project Summary
Over the past 20 years the breeding of Arabian Oryx has been very successful, both in Dubai and around the world. Bring the species back from the state of Extinct in the wild and classified as Endangered by the IUCN Red List to having healthy re-introduced populations in a number of countries have led to a downgrade of its endangered status to Vulnerable. However it is important to now change the objective from reproduction to a sustainable population by ensuring we have the most genetically diverse and viable population possible to ensure their long term survival. This research aims to achieve the following;
- Ascertain the genetic diversity of the Oryx population found within the Dubai Emirate.
- Utilize the genetic data to develop a strategy to improve the genetic quality of Dubai’s Arabian Oryx population.
- Contribute to the regional efforts for the conservation of Arabian Oryx.
Research Objectives
- Collect blood, Tissue or Plucked hair samples from 10% of the Dubai population.
- Complete genetic analysis on all of these samples.
- Establish the level of genetic diversity within the Dubai population and measure it against the genetic diversity and maternal lines of genetically known populations.
- Design a genetic management program to enhance the genetic diversity of the Dubai population as well as contributing to other regional programs.
Methodology
There are approximately 2000 individual in the Arabian Oryx population of Dubai this comprises collections under intensive management as well as populations in extensive Protected areas. As stated the goal will be to collect either Tissue or blood samples from 10% of the population as per the University of Edinburgh, Arabian Oryx Genetic Management – Sampling Protocol (attached). Samples will be collected from as many different herds as possible within each collection. Tissue samples will be collected with a biopsy needle shot from a dart gun and blood samples will only be collected if the animals are being handled for other reasons.
Expected Outcomes
- A report will be prepared by University of Edinburgh, Conservation Genetics Lab. This report will detail the results of the DNA extraction and sequencing, providing us with a genetic profile of the Arabian population within Dubai.
- The data gathered from the genetic report will be utilized to develop a plan to maximize the genetic diversity of the Dubai oryx population. This will be completed by assessing the differences in genetic material between the different herds in Dubai as well as other populations with known genetics and developing a plan of exchange to maximize genetic diversity in the DDCR herd as well as the other herds in Dubai and the region.
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Machine Learning for Bio-diversity Monitoring and Tracking at Scale
Machine Learning for Bio-diversity Monitoring and Tracking at Scale
Project Summary
The need to protect the environment has taken center stage in recent years as the damage to the Earth’s natural ecological balance has become increasingly tangible. Natural reserves are set to protect the biodiversity. With this good intent comes great challenges. Understanding the populations of animals and vegetation living inside the reserve is a key parameter to secure the equilibrium and the continuity of the ecosystem. We propose to investigate the problem of biodiversity monitoring and tracking using machine learning techniques for mining useful information from complex data, image/videos.
Deep learning methods have proven to be efficient in the image processing field. In fact, their introduction in this area has reshaped the way images are processed and understood. At the same time, this raised expectations with regards to performing and automating the processing and understanding of images, along with understanding their content. A large number of works have been performed and many methods have been proposed to tackle different aspects of the problem. The novelty in this project resides in two folds: it is the first time that the performances of existing algorithms will be evaluated in such large magnitude and diversity of experiments, which will support the investigators to propose new algorithms. The second novelty resides in the application of the approach in the area of biodiversity tracking and monitoring in the desert. In fact, the investigators are not aware of any existing efforts that suggest the application of image mining in the desert.
The investigators intend to work closely with the DDCR to help detect and monitor the different species, their evolution, movement, and gender. This will directly help the DDCR in better estimating the number of animals, predict their evolution, understand their moves, and understand the density of those animals. The project is expected to be beneficial for the wildlife and the biodiversity.Research Objectives
- Collect a significant quantity of data to test a number of existing methods in real-life situations.
- Determine benchmarks to be used in the evaluation of future methods.
- Setup optimized techniques for scanning large desert areas for resources management.
- Propose methods for identifying animals, their family, gender, and movements.
- Create a set of methods and workflows to implement the findings of this project.
Methodology
This research will make use of modern image mining techniques to contribute to the area of environmental protection through automatic animals’ recognition and identification in wild areas. In this project, we will begin by creating a large scale and controlled experiments protocol to evaluate the top existing methods in research w.r.t. our context, i.e., animals identification in wild areas. We will then follow an experiment-based methodology in which real situations and real datasets (e.g., UAV captured images and videos) will be used for observation and learning models. These datasets will serve as a foundation for enabling the extraction of actionable knowledge. Once the experiments are performed; we will proceed to researching a method (or methods) that would integrate the knowledge and the learnings from the experimental phase.
At a high level, we will follow the steps shown in the next section.- Data collection and preparation: As a backbone of our research and experiments, the data to analyze will be related to litter in wild areas, i.e., desert in our case. As UAVs will be largely used here, the configuration of the experiments must be taken care of to ensure an objective assessment and interpretable quality of the outcomes. The datasets have to be tagged and classified to make sure that we can build the expected models. Considering the nature of the environment, different attempts may be considered to ensure a high quality of data is gotten.
- Benchmarking of existing methods: Relying on the collected data, a large experimental setup will be put in place to evaluate the most recent and advanced techniques available in the literature to identify animals, as well as movements and related concepts.
- Model(s) development: The objective here is to elaborate new methods for supporting animals identification in wild areas. While developing the models, we should take into consideration that we are dealing with real-time and heterogeneous data taken under different constraints.
- Implementation and Evaluation: This step will basically run across the entire project. Its objective will be to define the quality of the proposed methods and approaches in terms of effectiveness and performance. We will perform this objective through formal methods and subjective evaluations.
Expected Outcomes
- The project will provide a set of data, described in detail and capturing different situations and constraints.
- This report will contain a rigorous description of a set of experimental protocols that will govern the test of different methods and techniques in the literature.
- This deliverable is the final outcome and expectation of the project. It is a software platform that is dedicated for end-users and which will allow them to analyze real-time streams coming from unmanned aerial vehicles. It will embed artificial intelligence techniques that will not only reduce, e.g., the noise in image streams but also the selection of the best configuration to use by the UAV depending on the external constraints. The software is expected at the end of the project in its final version.
- We will target at least 2 top conferences/journals publications. These publications will be expected during the second year of the project, mainly.
- This report is a classical final report. It will be provided at the end of the project and will describe the achieved objectives and outcomes of the project.
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Large Scale Explorations of Real-Time Image Mining Captured by Unmanned Aerial Vehicles (UAVs): Application to Environment Protection
Large Scale Explorations of Real-Time Image Mining Captured by Unmanned Aerial Vehicles (UAVs): Application to Environment Protection
Project Summary
The need to protect the environment has taken center stage in recent years as the damage to the Earth’s natural ecological balance has become increasingly tangible. As humans, we consume a large amount of plastic as it has become a cornerstone of many manufacturing and packaging processes. In fact, it is common practice to dispose of unwanted waste improperly in the form of litter and illegally dumped garbage. Whether this occurs on the streets, where many people simply drop their unwanted packaging, or during time spent in extra-urban environments, it is clear that littering has become a significant problem in many societies and contexts.
Deep learning methods have proven to be efficient in the image processing field. In fact, their introduction in this area has reshaped the way images are processed and understood. At the same time, this raised expectations with regards to performing and automating the processing and understanding of images, along with understanding their content. A large number of works have been performed and many methods have been proposed to tackle different aspects of the problem. The novelty in this project resides in two folds: it is the first time that the performances of existing algorithms will be evaluated in such large magnitude and diversity of experiments, which will support the investigators to propose new algorithms. The second novelty resides in the application of approach in the area of liter identification in the desert. In fact, the investigators are not aware of any existing efforts that suggest the application of image mining in the desert.
The investigators intend to work closely with the DDCR to help detect and monitor litter in three key areas; along the boundary fence, camp areas and driving routes throughout the reserve. This will directly aid the DDCR in coordinating litter recovery as well issuing fines to parties who have violated the regulations regarding litter. In addition to a potential monetary gain and reduction in resources dispensed in patrolling the reserve, the wildlife will benefit from a reduced exposure to harmful objects which they may mistake for food.Research Objectives
- Collect a significant quantity of data to test a number of existing methods in real-life situations.
- Determine the constraints that affect the quality of image understanding in real situations.
- Determine benchmarks to be used in the evaluation of future methods.
- Create a set of methods and workflows to implement the findings of this project.
Methodology
This research will make use of modern image mining techniques to contribute to the area of environmental protection through automatic litter recognition and identification in wild areas. In this project, we will begin by creating a large scale and controlled experiments protocol to evaluate the top existing methods in research w.r.t. our context, i.e., litter identification in wild areas. We will then follow an experiment-based methodology in which real situations and real datasets (e.g., UAV captured images and videos) will be used for observation and learning models. These datasets will serve as a foundation for enabling the extraction of actionable knowledge. Once the experiments are performed; we will proceed to researching a method (or methods) that would integrate the knowledge and the learnings from the experimental phase.
At a high level, we will follow the steps shown in the next section.- Data collection and preparation: As a backbone of our research and experiments, the data to analyze will be related to litter in wild areas, i.e., desert in our case. As UAVs will be largely used here, the configuration of the experiments must be taken care of to ensure an objective assessment and interpretable quality of the outcomes. The datasets have to be tagged and classified to make sure that we can build the expected models.
- Benchmarking of existing methods: Relying on the collected data, a large experimental setup will be put in place to evaluate the most recent and advanced techniques available in the literature to identify litter.
- Model(s) development: The objective here is to elaborate new methods for supporting litter identification in wild areas. While developing the models, we should take into consideration that we are dealing with real-time and heterogeneous data taken under different constraints.
- Implementation and Evaluation: This step will basically run across the entire project. Its objective will be to define the quality of the proposed methods and approaches in terms of effectiveness and performance. We will perform this objective through formal methods and subjective evaluations.
Expected Outcomes
- The project will provide a set of data, described in detail and capturing different situations and constraints.
- This report will contain a rigorous description of a set of experimental protocols that will govern the test of different methods and techniques in the literature.
- This deliverable is the final outcome and expectation of the project. It is a software platform that is dedicated for end-users and which will allow them to analyze real-time streams coming from unmanned aerial vehicles. It will embed artificial intelligence techniques that will not only reduce, e.g., the noise in image streams but also the selection of the best configuration to use by the UAV depending on the external constraints. The software is expected at the end of the project in its final version.
- We will target at least 2 top conferences/journals publications. These publications will be expected during the second year of the project, mainly.
- This report is a classical final report. It will be provided at the end of the project and will describe the achieved objectives and outcomes of the project.
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Pathogen Risk Assessment on Arabian felines in the United Arab Emirates and Oman
Pathogen Risk Assessment on Arabian felines in the United Arab Emirates and Oman
Project Summary
Arabian felines (Arabian leopards, cheetahs, wildcats, sand cats and caracals) are either regionally extinct, critically endangered or their populations are worryingly declining in the Arabian Peninsula. Thus, the International Union for Conservation of Nature (IUCN), the global authority on the status of the natural world and the measures needed to safeguard it, claimed the need to carry out further research on the factors that may threaten these five felids.
Felid conservation will increasingly need to include assessments of disease risks and strategies for disease management in order to be successful, since it is known that most wild-feline populations are at risk of exposure to new pathogens due to deterioration of many of their inhabited ecosystems, as well as the fact that historic geographic barriers have been bridged, which might imperil population health. At the same time, due to the gravity of these animals’ situation in the wild, they are held and bred in captivity at centres worldwide. Such captive breeding programmes are essential in maintaining genetic diversity and saving these species from extinction, since their reintroduction may be the only means of restoring their populations in the wild. Nevertheless, captive animals are more likely to contract diseases because animals live in close proximity to each other. Whereas in nature diseases that are caused by parasites comprise one of the major problems resulting in even morbidity and mortality in these animals, in captivity the effects range from sub-clinical to death.
In this framework, the aim of this project would be to determine the types, prevalence, and intensity of parasitic, bacterial and viral infections in the wild and captive Arabian felines located in the United Arab Emirates and Oman. Very little has so far been published on pathogenic diseases of these felines in the Arabian Peninsula either in the wild or in captivity, and a study of this scope in such field would be the first of its kind. The results obtained will constitute a baseline data and a vital reference for future research in such neglected area. Moreover, the knowledge obtained from this project will, inevitably, be used in future reintroduction and reinforcement projects of these species in both countries.Research Objectives
- Which parasitic, bacterial and viral pathogen species infect/circulate within the Arabian felines populations in the UAE and Oman?
- When comparing wild and captive Arabian felines populations, what are the differences in pathogen prevalence and abundance?
- Does the prevalence and/or abundance of some of these pathogens comprise a threat to the Arabian felines’ lives?
Methodology
Please see Appendix I and II.
Expected Outcomes
- Launching collaboration between the Veterinary Medicine Department and Department of Biology at UAEU, and The Biology Department at SQU, as well as Governmental authorities and NGOs working in conservation of the Arabian felines in both countries.
- The expected results will be published in peer reviewed journals related to animal conservation and health.
- The data and conclusions will be presented in national and international conferences.
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Statistical evaluation of Sorbonne University Atmospheric Forecasting System (SUAFS) at Dubai Desert Conservation Reserve (DDCR) (phase 1)
Statistical evaluation of Sorbonne University Atmospheric Forecasting System (SUAFS) at Dubai Desert Conservation Reserve (DDCR) (phase 1)
Project Summary
Sorbonne University Atmospheric Forecasting System (SUAFS) is an integrated combination of advanced models able to provide detailed weather desert forecasts on various temporal scales over the Arabian Peninsula and the greater UAE areas.. The following predictions currently available by SUAFS (http://forecast.psuad.ac.ae) are:
- Weather forecast for 72 hrs ahead (3 days).
- Desert dust forecast for 72 hrs ahead (3 days).
SUAFS is running operationally since July 2018 and an annual archive of weather and desert dust forecasts are almost available for evaluation.
This research proposal offers a unique opportunity to initiate the framework for an important collaboration with DDCR in terms of environmental warnings and monitoring. Thus, the main aim of the Phase-1 project is to validate SUAFS forecasts against the atmospheric measurements obtained from DDCR meteorological stations. The entire records and data of the main atmospheric parameters from the network of the meteorological stations of DDCR, as well as the neighbored available stations, will be utilized for comparison with SUAFS forecasts. The extracting statistical scores will be helpful to identify the forecast errors of the system and their propagation into the period of the simulation. The results of this research work will lead SUAFS forecasts to achieve greater accuracy and reliability especially over the area of interest.
These results will be the base of the Phase 2, who focus on the air quality monitoring and dust forecasting dedicating for the DDCR. All the results will be at DDCR and SUAD disposal and a report with all the data will be submitted. Phase-1 will also act as a preparatory phase for attracting additional funding to launch the demanding Phase-2.Research Objectives
- Process and homogenization of the atmospheric measurements from the DDCR meteorological stations network.
- Statistical evaluation of SUAFS.
- Achievement of greater accuracy and reliability for the weather forecasting conditions in DDCR broader area.
Methodology
In Phase-1, the primitive records (bulk data) obtained from the meteorological stations will be processed in order to be implemented for the SUAFS assessment. Atmospheric forecasts of specific parameters such as near surface temperature, wind speed, humidity, mean sea level pressure and precipitation will be also processed for direct comparison against in-situ records of the stations.
The evaluation of the SUAFS weather forecasts will be made in the DDCR area where the available surface stations have been installed. Additionally, surface observations from neighborhood networks will be used to verify and compare categorical model forecasts of the 10-m wind field, 2-m air temperature and sea level pressure and the accumulated precipitation.
The evaluation methodology will be based on the point-to-point comparison between model-generated variables and observations. For the variables of wind speed, air temperature, humidity and sea level pressure the scores produced are the standard mean error (BIAS) and the root mean square error (RMSE). The verification scores used for the precipitation will be derived using the contingency table approach. This is a two-dimensional matrix where each element counts the number of occurrences in which the gauge measurements and the model forecasts exceeded or failed to reach a certain threshold for a given forecast period. Thus, the forecast skill can be measured by evaluating the bias score (BS) and the equitable threat score (ETS).Expected Outcomes
- SUAFS statistical scores (BIAS, RMSE, ETS) in the forecast window of 06-72hours
- Final report or publication in scientific journal or in conference proceedings. Presentation or one-day workshop in DDCR or SUAD to present the results.
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Analysis of trophic niche partitioning of desert rodents through diet reconstruction
Analysis of trophic niche partitioning of desert rodents through diet reconstruction
Project Summary
For this project we want to investigate the trophic niche partitioning of the desert rodents found in the Dubai Desert Conservation Reserve. Currently, the rodent populations and inter-species interactions in the DDCR are relatively unknown. We plan to use next generation sequencing (NGS) on fecal samples from the rodents species found in the DDCR to analyze their diet, gut microbiomes and parasite composition in order to evaluate the presence of trophic niche partitioning and to determine the functional role the gut microbe communities play in host evolution.
Furthermore, we want to evaluate the effects of anthropogenic features in the reserve (i.e. feeding stations and the Al Maha resort) on the rodents’ diets by looking for significant differences in our data from both far and near these features. We want to provide a deeper understanding of UAE desert ecological structures, their dynamics, and mechanisms. This is especially relevant for any future conservation or management action implemented on the area or on the rodents themselves.Research Objectives
- Reconstruct the typical diet of the six rodent species using NGS from fecal samples and compare the results for the presence of trophic partitioning.
- Examine the effects of grazers’ feeding stations on the desert rodents.
- Investigate if there is a significant anthropogenic effect from the Al Maha resort on the rodents’ diets.
Methodology
Field study: we plan to deploy approximately 100 baited rodent traps (Sherman traps, life traps) in the DDCR area. The traps will be equally divided amongst the different habitats, as well as close and far from the feeding stations and close and far from the resort. We will conduct three field visits during three different seasons lasting between 2 and 3 days per visit. We expect to obtain 20 feces and tissue samples (obtained via ear punching; for DNA barcoding) per rodent species per season; with a minimum of 5 samples per species per season for sufficient statistical analysis. Additionally, we will collect the available plant species in the different rodent habitats (i.e. the food resource) from the DDCR for DNA barcoding and creation of a reference catalog.
From the samples we will extract the DNA and run 18s and 16s PCR-based amplification. We will do 18s and 16s gene metabarcoding using next generation sequencing. We will analyze the results for presence and absence of organisms and relative abundance in order to check for partitioning of the niche. Furthermore, we will look for significant differences in dietary choices of rodents influenced either by the resort or the feeding stations.
Most statistical analyses will be conducted using Permanova and partial Mantel tests using R software.Expected Outcomes
- Using next generation sequencing we will obtain the range of the diet of the desert rodents and whether there is trophic niche partitioning.
- Analysis of effects of anthropogenic actions on the rodents.
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Understanding Spatiotemporal Dynamics of a Desert Gecko Community. Insights From Diet, Microbiome, and Parasitic Composition
Understanding Spatiotemporal Dynamics of a Desert Gecko Community. Insights From Diet, Microbiome, and Parasitic Composition
Project Summary
Understanding trophic interactions and the ways in which they influence niche partitioning remain at the core of ecology, and may have strong implications for conservation biology. Unfortunately, the dynamics of trophic interactions within communities of desert species remain largely undescribed. An example reflecting this claim is a community of nocturnal geckos inhabiting sandy sheets of the United Arab Emirates, which consists of three species - Stenodactylus arabicus, Stenodactylus doriae and Bunopus tuberculatus. A single study investigating basic ecology of the desert lizards of Arabia characterized the aforementioned geckos as insectivores. However, the exact way in which the partitioning of the dietary niche occurs within this community remains unknown.
A similar lack of understanding occurs within a system of two species inhabiting gravel plains. Stenodactylus slevini and Stenodactylus leptocosymbotes are two closely related nocturnal sepcies characterized by comparable morphological traits. Interestingly, field surveys revealed lack of overlap in the occurrence ranges, indicating that these two gecko species may exclude each other. An explanation of this phenomenon may be a potential overlap in dietary prefrences, however, this claim has never been investigated.
Diet is also known to influence microbial and parasitic composition. The vast majority of microorganisms associated with vertebrates can be found in the digestive system. These microorganisms have been shown to influence the host's physiology, development, and immune system. Until today, it remains a major goal to determine the functional role these microbe communities play in host evolution.
Excessive grazing of captive camels has been recognized as the single greatest threat to the desert ecosystems of the UAE. However, the effect of this phenomenon on small vertebrate (i.e lizard) communities remains unknown. Even though in most cases a direct prey competition between these animals and camels does not occur, there may be a strong indirect effect exerted by the grazers (decrease in number of prey animals who are dependent on substantial vegetation cover, reduction of hiding places, increase in terrestrial temperatures, etc). Hence, it remains of uttermost importance to understand how the results of overgrazing affect the dynamics of small vertebrate communities in order to establish appropriate conservational measures.
The proposed study aims at identifying the dietary preferences, microbial and parasitic compositions of the gecko species across different seasons and locations with varying grazing pressure. For this, stool samples of S. arabicus, S. doriae and B. tuberculatus will be collected over three seasons (fall, winter, summer) and contents will be analyzed using next-generation sequencing. In addition, prey availability and selection will be analyzed using pitfall trapping of arthropods and selective sequencing for barcoding purposes. Sampling will be conducted in two distinct locations - the DDCR and the Arabian Nights Village Road (Abu Dhabi Emirate), which differ significantly in the extent of vegetation cover. The project will potentially be extended to include S. slevini and S. leptocosymbotes from the gravel plains to determine reasons for mutual exclusion.
The results from next-generation sequencing will be analyzed using Permanova and partial Mantel tests to detect significant differences in diet, microbial and parasite compositions between the study species.Research Objectives
- To identify the dietary preferences of the three gecko species inhabiting the sandy sheets (B. tuberculatus, S. doriae, S. arabicus) across seasons.
- To determine the effect of dietary preference on niche partitioning of S. slevini and S. leptocosymbotes.
- To identify the effect of vegetation cover on the dietary preferences, microbiome and parasitic composition of the gecko species.
Methodology
Individuals from the chosen gecko species will be collected at night in order to obtain their fecal samples. The fresh stool will be transferred to sterile tubes and stored in liquid nitrogen immediately. The sampled geckos will be individually marked in order to avoid repetitions. Additionally, the sampling locations will be surveyed for insects, which will be captured, identified and euthanized in order to obtain 18s sequences.
Upon return to the laboratory, DNA from the feces will be extracted using Qiagen Stool Kit. Then, genetic markers 16s and 18s will be amplified using PCR-based protocol. The PRC products will be sequenced using next-generation sequencing. The sequences retrieved from the facility will be annotated, cleaned and compared with the ones available in the datasets. In such a way, species-specific information about dietary preferences, microbial and parasitic composition will be obtained and used to answer the questions at the community level.Expected Outcomes
- We expect that closely related, syntopic, and nocturnal gecko species from the sandy sheets will segregate and dietary niche to allow for co-existence (avoidance of competitive exclusion); in case of the two species inhabiting gravel plains, we expect that they will have highly similar diets (competitive exclusion).
- We expect that overgrazing will have strong negative effects on gecko species composition, abundance, as well as effects (positive, neutral or negative) on dietary, microbial and parasite composition.
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Identifying the colony role of late instar larvae in Psammotermes hybostoma: A potentially new sterile worker caste?
Identifying the colony role of late instar larvae in Psammotermes hybostoma: A potentially new sterile worker caste?
Project Summary
Termites, particularly the lower termites, have extraordinary developmental plasticity which has allowed them to adapt to varied and even harsh environments. Psammotermes hybostoma exemplifies this due to their capacity to survive in ecosystems with net zero productivity, such as arid deserts within the UAE.
This species also has a unique developmental pathway leading to older larvae which have an unknown function but are seemingly five times the size of the other individuals within the colony. It has been hypothesized that these individuals may produce metabolic water to help hydrate the colony, therefore could potentially be a new sterile worker caste. By collecting this species from the wild and undergoing behavioral experiments in the lab, the true nature of these individuals can be discovered.Research Objectives
- Locate and collect colonies of the termite species.
Methodology
I will find the location of workers outside the nest which will help identify the location of the nest. Once the nest is found, using a shovel, I will collect the whole colony into a safe container. If external workers are not easily identifiable, bait traps can be used to lure out the workers, helping with locating the nest sites.
Expected Outcomes
- I will need to locate the nest of this termite species and then collect the whole colony for transportation back to the UK.
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Arthropod Diversity in Ghaf Groves at the DDCR
Arthropod Diversity in Ghaf Groves at the DDCR
Project Summary
Arthropods are frequently sampled using a passive collection method called malaise trap. Such a trap can collect both flying, crawling, walking and jumping arthropods. A similar trap is used for sampling arthropods aerially (e.g. in trees) called a SLAM (Sea Land Air Malaise). A preliminary study during October 30th 2017 till April 3rd 2018 at the DDCR in a Ghaf Grove showed clear differences in arthropod diversity and abundance between samples collected using a malaise trap and SLAM trap. The proposed study will ascertain which arthropods are found at elevation within a tree in comparison to those that are found from the ground upwards.
Research Objectives
- Seasonal arthropod diversity within DDCR ghaf groves.
- Arthropod faunal difference collected by the two different methods (malaise and SLAM trap).
- Arthropod micro-habitat utilization within a ghaf tree.
- Suitability and refinement of the use of malaise and SLAM traps in a desert ecosystem.
Methodology
For direct comparison of data, two malaise traps and SLAM traps will be set up, one set in the ghaf grove situated in the Eastern region of the DDCR and the other in the Western region ghaf grove. The traps will be set up on October 2nd 2018 and will remain in situ for one year, with a possibility of extending this time period, depending on sampling success. Once operational, the sample bottles are exchanged every two weeks. Samples are passively collected into 70% ethanol and subsequently stored in containers with the same concentration. Samples are sorted in the lab into order, family, genus and species if possible, and where necessary, samples will be sent to a network of experts to help with identification. For population studies, individual species (whether identified or not) will be counted. Comparison will be drawn between taxa found in each trap and further literature review will take place to ascertain habitat requirements/feeding habits. For species where this information is not known, further research plans will be made.
Expected Outcomes
- Species lists.
- Data reflecting differences in arthropod populations from malaise and SLAM traps in a ghaf grove.
- Data collection on the efficacy of these types of traps in a desert ecosystem.
- Peer-reviewed journal publication; conference poster/presentation
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Archaeological – Geo-archaeological Research in the DDCR
Archaeological – Geo-archaeological Research in the DDCR
Project Summary
Sorbonne University Abu Dhabi have the interest to develop an archaeological and geoarchaeological research at the DDCR broader area. The department of Archaeology and History of Art has a great experience in archaeological prospection in archaeological sites in UAE (Masafi, Sarouk Al Hadid, etc.) as also abroad - in Lebanon (Baalbek, Bisri, Chhim, etc.), Syria (Palmyra, Apamea), Greece (Delos) as well as in methods and technics related to photogrammetry and 3D scanning of artefacts and buildings. The Department of Geography and Planning has a great experience in geoarchaeological research till 2003 in Southern Europe (Balkan peninsula, Greece, Cyprus, France etc.), in Middle east (Egypt, Lebanon, Kingdom of Saudi Arabia, Kuwait, Oman, Bahrein) as in the UAE (Sarouk al Hadid, Masafi, Marawah, Ras Ghumais etc.) as well as in methods and technics related to the GIS, remote sensing and multi proxy analysis of the sediments and landforms.
The aim of this research proposal is the systematic archaeological field investigation in selected areas of DDCR, collection archaeological objects, classification of archaeological findings, and age determination, their localization by GPS, and their insertion in GIS database for evaluation and storage. Geomorphological mapping using remote sensing technics and fieldwork including sediments sampling for multiproxy analysis and dating.
The results of archaeological analysis and from the geomorphological and remote sensing analysis with the sediments multi proxy investigation can provide to us information’s about the potential existence of an archaeological site in the DDCR protected area.Research Objectives
- Systematic surface Archaeological investigations using GPS and GIS.
- Classification and age determination of the archaeological findings. Possibility to conduct virtual analyze of 3D objects (non-invasive approach).
- Geomorphological mapping and spatial distribution of the archaeological findings.
Methodology
Systematic surface survey of the proposed area at the map. Four to five bachelor students of the department of Archaeology and History of Art of SUAD under the supervision of the Professor Dr. Ingrid Perisse Valero and another professor or archaeologist from Sorbonne University (name TBC) will do field investigations for three weeks in total on the area of interest.
Archaeological findings and artifacts field collection, localization by portal GPS and classification, digitalization of chosen artefact for 3D models. All the field data will be stored and processed in GIS database.
A report preparation of the findings and the localization of the artifacts and they propose the next steps of the archaeological investigations.
At the same time, one student, under the supervision of Prof. Dr. Kosmas Pavlopoulos and Dr. Haifa Ben Romdhane, will map the area of interest, the landforms, the sediments and they describe the geomorphological processes of the area. This research survey needs 2 weeks in total.
During the geomorphological/geological research a radar satellite data will be analyzed and process (INSAR, SAR, Sentinel, ALOS-pulsar2) to detect the substratum rocky paleo relief below the dune deposition. Dr. Haifa ben Romdhane and Prof. Kosmas Pavlopoulos will be responsible for this stage and deliverables.Expected Outcomes
- Maps with the details position of the archaeological findings, including the written report of the archaeological findings classification report.
- Geomorphological map of the broader area of research. Analysis of the satellite images and interpretation. Report including the geomorphological and remote sensing results.
Annual Reports
The Dubai Desert Conservation Research began publishing annual reports in 2019-20, outlining its milestones, achievements and the research projects undertaken each year.
Our Research Reports
Read reports on research conducted in the DDCR since 2003 and their impact on our management decisions and conservation efforts.
Flora
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Hyper-arid tall shrub species have differing long term responses to browsing management
Hyper-arid tall shrub species have differing long term responses to browsing management
David J. Gallacher & Tamer Khafaga
ABSTRACT
Hyper-arid rangeland vegetation is typically dominated by large woody species which are often overlooked in herbivory studies. Long-term responses of tall shrub populations to herbivory change are poorly understood in the Arabian Peninsula. Population and size of 1559 individuals from four shrub species were assessed over 11 years under two herbivory regimes, one in which domestic livestock (camels) were replaced by semi-wild ungulates (Oryx and gazelles) before, and the other during, the study period. Each shrub species exhibited a different response to the change in herbivory. Populations of Calotropis procera decreased dramatically. Populations of both Calligonum polygonoides and Lycium shawii increased through sexual reproduction, but the spatial distribution of recruits indicated different modes of seed dispersal. Average lifespans were estimated at 22 and 20 years respectively. The persistence strategy of Leptadenia pyrotechnica was similar to tree species of this habitat in that vegetative regrowth was prioritised over recruitment, and average lifespan was estimated at 95 years. Shrub responses to changes in ungulate management are therefore species-specific. The response of individual plant size was faster than the response of population size, which was limited by slow sexual recruitment (L. pyrotechnica) or localised seed dispersal (C. polygonoides). -
Macromorphology and recruitment of Prosopis cineraria in the United Arab Emirates
Macromorphology and recruitment of Prosopis cineraria in the United Arab Emirates
David J. Gallacher and Ali El-Keblawy
ABSTRACT
Recruitment frequency of Prosopis cinerariain the United Arab Emirates is poorly understood, though heavy browsing by camels is often assumed to be a limiting factor. Macromorphological characteristics were recorded at eight locations from the northern United Arab Emirates. Tree size (canopy diameter, trunk diameter, and tree height) showed conformity within locations. Height of browse line was strongly affected by camels, which removed foliage to a height of 3 meters whenever present. Recruitment by seed was not observed during the study, and observed asexual recruitment was limited to root suckers produced only within the season. Presence of suckers was unrelated to browsing but strongly affected by a shifting ground surface. Viable theories for the absence of sexual recruitment include seedling destruction by herbivores, a lack of safe sites for seedling growth and establishment, and that sexual recruitment events might naturally occur rarely, but produce many recruits in the rare successful seasons. Significant recruitment of new individuals is likely to occur only with protection from current herbivory systems. -
Plant Species Identification via Drone Images in an Arid Shrubland
Plant Species Identification via Drone Images in an Arid Shrubland
Dr David Gallacher, Mr Tamer Khafaga, Mr Tamer Mahmoud Ahmed, Mr Hatem A. Shabana
The Arabian Peninsula is famous for its vast areas of desert rangelands and described by its sparse and low vegetation diversity. It is prohibitively expensive to monitor these lands by using satellite or manned aircraft due to its scale; while, ground monitoring is very labour intensive. In the present study, we aimed to assess whether low altitude aerial photography via drones stratified sampling could provide a feasible alternative to ground-based monitoring of vegetation.
Seventeen abundant species were selected and between 30 and 44 individual plants were numbered and identified by the resident botanist, and then photographed from above at 10, 30 and 100m (Ground sampling distances, GSDs, of 2, 6 and 20mm) using DJI s1000 multirotor drone with a Sony NEX7 24MB camera. Images were selected and cropped to include one sample of each labelled plant at each GSD and assigned a randomised filename, each image contained between one and 54 labelled plants. Two botanists who are familiar with the region, but not with the particular location, then classified each image to species, genus and plant group (tree, shrub, herb, grass, sedge).
The result have shown that plant species identification by drone is less accurate than ground-based assessment at any resolution, but it does provide several other benefits; of which, the collection of data from large sample areas in a short period. More data could, therefore, collected during seasons of peak growth or reproduction. Our study indicates that it would be feasible to establish a database of all perennial plants within predefined sample areas and thus aerial collects biomass estimates periodically for georeferenced perennial species. -
Ecological monitoring of arid rangelands using fixed-wing micro-UAVs (drones) in the MENA region
Ecological monitoring of arid rangelands using fixed-wing micro-UAVs (drones) in the MENA region
Dr David Gallacher, Zayed University, UAE Email: david.gallacher@zu.ac.ae
Mr Tamer Khafaga, Dubai Desert Conservation Reserve UAE Email: tamer.khafaga@emirates.com
It is often stated that rangelands suffer from overgrazing and excess water extraction, but there is a lack of reliable historical data to support these claims. Data exists in well managed reserves such as the Dubai Desert Conservation Reserve (DDCR), but it is labour intensive and expensive to maintain a routine system of monitoring.
Recent years have seen the rapid emergence of low-altitude unmanned aerial vehicles (micro-UAVs) for civilian use. Micro-UAVs have clear potential use for spatial ecology studies (Anderson and Gaston 2013) and for biodiversity assessments (Getzin, Wiegand, and Schöning 2012).
The long-term aims of this project are to (1) reduce the cost of rangeland, and (2) to provide a tool that nonspecialists in the region can use, thus encouraging the gathering of much better information for land management decisions.
Preliminary research has been conducted using a DJI s1000 octocopter equipped with a 24MP RGB and a 3.2 MP multispectral camera, and a SenseFly eBee fixed-wing drone equipped with 12 MP RGB and multispectral cameras. Preliminary trials were conducted to identify the maximum ground sampling distance (related to drone altitude and camera resolution) required to be able to identify individual species with reasonable accuracy. Images were collected at 10 m intervals from 10 to 300m above animal and plant species. From this, trials will be conducted at selected altitudes, and species observation from resulting images will be checked for accuracy against ground-based data.
At time of writing, observational data of known species taken from different altitudes has been collected, illustrating the viability of the technology. By the time of the conference presentation, results should include at least one structured study evaluating the reliability of the technology at a specific ground sampling distance.
Micro-UAVs have an enormous potential for improving rangeland management in the MENA region. However, much work still needs to be done to streamline processes and evaluate the enormous amount of data produced. -
Impacts of Surviving and Dead Shrubs and Grasses on Floral Diversity and Community Structure of Sandy Dunes of the UAE
Impacts of Surviving and Dead Shrubs and Grasses on Floral Diversity and Community Structure of Sandy Dunes of the UAE
Desertification of sandy areas driven by wind erosion in the Arabian Gulf region often results in the dominance of few shrubs and grasses, while most of the land are devoid of vegetation. The impact of surviving and dead shrubs and grasses on floral diversity and plant community structure was assessed on stabilized sand dunes in Dubai Desert Conservation Reserve. Shrubs have greater role in facilitating plant recruitment and survivorship and hence enhancing floral diversity, compared to grasses. Both dead shrubs and grasses attained significantly greater species richness, abundance and diversity indices compared to comparable surviving shrubs and grasses, so the effect of dead grasses was more pronounced than that of dead shrubs. Grasses have a greater role in enhancing floral diversity after their death. For restoring the productivity and species diversity of degraded sandy desert habitats, the study recommends the maintenance and growing shrubby plants as an early successional stage that facilitate the environment of other annuals and perennial plant. This would help in stability of the fragile desert ecosystems.
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A Comparative Study of Vegetation Structure and Regeneration between two Monitoring Surveys in Dubai Desert Conservation Reserve
A Comparative Study of Vegetation Structure and Regeneration between two Monitoring Surveys in Dubai Desert Conservation Reserve
Khafaga T A, Conservation Officer, Dubai Desert Conservation Reserve, DDCR
Abstract
This research is designed to implement a continuous practical and efficient vegetation monitoring program and to apply analytical tools for easy data interpretation. This information and data is indispensable for managing the Dubai Desert Conservation reserve, Dubai - United Arab Emirates.
The objective of the study was to compare the structure and the regeneration patterns of the vegetation between two monitoring surveys in Dubai Desert Conservation Reserve. The study policies were to implement continuous practical and comparative vegetation monitoring program and to apply analytical tools for the data interpretation which mainly emphasize the assessment of density, cover and diversity of the flora. Mapping the vegetation and defining lineage between different floral communities, using multivariate analysis combined with GPS techniques was also an objective for the study.
The results showed an incredible increase in species number and biodiversity when compared to the first monitoring study, the date indicates also good habitat recovery and it was attributed to the removal of the camel farms previously located within the reserve premises which gave the vegetation and the habitats a good chance to recover. -
Camel grazing affects species diversity and community structure in the deserts of the UAE
Camel grazing affects species diversity and community structure in the deserts of the UAE
A. El-Keblawya,*, T. Ksiksi a, H. El Alqamy b
Camel grazing plays a crucial role in the desert ecosystems of the UAE. In this study, we compare areas grazed by small antelope (Al Maha Resort – the AMR) with areas grazed by both camels and small antelope (Dubai Desert Conservation Reserve – the DDCR). A total of 126 plots were selected during the growing season 2006/07 on three soil substrates: gravel plains, sand flats and sand dunes. In each plot, several vegetation parameters were assessed: density, frequency, percent cover and diversity indices. The replacement of camels with wild antelope has significantly increased the number of species on gravel plains, vegetation density on sand dunes and diversity indices on both sand flats and sand dunes, but significantly decreased plant cover on sand flats and sand dunes. The increase in species diversity in the AMR was attributed to moderate grazing by antelope. Replacement of camels by antelope in the AMR has resulted in change in plant community composition of the three substrate types. Species recovered after protection from camel grazing are palatable, especially for camels, except Heliotropium kotschyi and Aerva javanica. The absence of most of the palatable species from the DDCR was attributed to both selective foraging and overgrazing by camels.
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Effects of camel grazing on density and species diversity of seedling emergence in the Dubai (UAE) inland desert
Effects of camel grazing on density and species diversity of seedling emergence in the Dubai (UAE) inland desert
D.J. Gallacher & J.P. Hill
Zayed University, POB 19282 Dubai, United Arab Emirates
Germination in the arid rangelands of the UAE occurs as an 'event' following a mid-winter to spring rainfall. A fence line study of the germination events was conducted in 2005 and 2006 to identify the response to differential grazing regimes. Fifty-six 1m² seedling plots were destructively sampled each season. Heavy grazing reduced species richness and diversity without significantly reducing seedling density. Both annual and perennial species were impacted, though the reduction in richness of the annual species was less pronounced than the natural variation among locations. Direct grazing of seedlings is limited to a few weeks, due to the short annual plant life span. Reduction of the perennial seedling density and species richness was likely caused by the reduced size of adults plants under grazing. Recruitment of perennial species could be affected by heavy grazing, leading to loss of habitat, though under moderate grazing levels this could easily be compensated by greater survival. -
Intensification of rangeland grazing in an oil-rich state; causes, consequences and possible solutions
Intensification of rangeland grazing in an oil-rich state; causes, consequences and possible solutions
D.J. Gallacher & J.P. Hill
Zayed University, POB 19282 Dubai, United Arab Emirates
Over the last 35 years land management and farmer lifestyles have changed dramatically on the rangelands of the United Arab Emirates. The human relationship with the rangelands has moved from subsistence to a secondary income or hobby. Both ecological health and indigenous knowledge of the rangelands are in decline. Large areas of the inland desert of the country are rapidly becoming urbanized. This paper reviews threats to the 225 km² Dubai Desert Conservation Reserve (DDCR) as a model of range and species conservation issues facing the country as a whole. Inland desert rangelands are threatened by groundwater depletion, habitat fragmentation, exotic species introductions and overgrazing. Overgrazing is currently the most serious threat to the inland desert, reducing range species diversity, production and available forage. Reduction of stocking rates requires a revision of pro-agricultural policies and resolving the legal ambiguity surrounding common grazing lands. It can be reasonably expected that environmental attitudes will shift from anthropocentric to ecocentric over time, but a shift in cultural heritage perceptions may also be needed to reassert a balanced approach to rangeland management. -
Effects of camel grazing on the ecology of small perennial plants in the Dubai (UAE) inland desert
Effects of camel grazing on the ecology of small perennial plants in the Dubai (UAE) inland desert
D.J. Gallacher & J.P. Hill
Zayed University, POB 19282 Dubai, United Arab Emirates
Camel grazing is recognized as a primary cause of ecological degradation in the UAE. A study of the perennial plant species <1m in height was conducted along a fence separating continuously camel grazed land from land in which camels had been replaced by oryx and gazelle species for 5 years (Al Maha). Vegetation regeneration in Al Maha in the absence of camels was considerable on all substrates (gravel, stable sand and semi-stable sand) but was greatest on the gravel substratum, indicating that ecology in this habitat is most at risk. Observed regeneration was primarily through vegetative reproduction and growth of existing plants, showing that existing species can tolerate heavy grazing. Therefore, an equilibrium grazing model of continuous and reversible vegetation dynamics is the most suitable for management of this ecological zone. Species richness was greater in Al Maha due to the greater number of plants, but biodiversity was unaffected. Ther was some evidence of localized dune stabilization within Al Maha due to increased vegetative cover. Further recovery of vegetation within Al Maha is discussed. This study highlights the need for reduced grazing pressure throughout the Dubai inland desert, and in particular gravel substrata. -
Effects of camel vs. Oryx and gazelle grazing on the plant ecology of the Dubai Desert Conservation Reserve
Effects of camel vs. Oryx and gazelle grazing on the plant ecology of the Dubai Desert Conservation Reserve
D.J. Gallacher & J.P. Hill
Zayed University, POB 19282 Dubai, United Arab Emirates
Grazing of the Dubai inland desert has changed substantially over the last century, and particularly over the last three decades. Populations of oryx, ostriches and gazelles have been replaced by an increased camel herd, which are at least 2.5 times historical levels. Camel grazing patterns differ to smaller herbivores, affecting plant species composition. Camels are given supplementary feed, so their population is not limited by seasonal availability of vegetation. Desert plants face longer periods of heavy grazing from a larger camel population, and shorter periods for recovery. Plant chemical defenses may also be less effective from the different grazing regime.
Although widely considered to be overgrazed, there is little information in the UAE on appropriate stocking levels for purposes of ecological sustainability or for maximizing pastoral production. The effect of grazing on vegetation was studied within the recently formed Dubai Desert Conservation Reserve (DDCR). Camel farms on the DDCR release camels during the day, allowing them to graze natural vegetation within the Reserve. It also contains an inner enclosure of five years in which camels were replaced by oryx and gazelles, separated by a 20 km fence. Fence line studies were made of (1) small (<1 m high) perennial plants, (2) seedling emergence during the winter of 2004/5, and (3) size and distribution of large shrubs (> 1 m high). In addition, telephone surveys were conducted on DDCR farmers, and spatial distribution of trees was recorded.
Heavy grazing in the DDCR has reduced the cover of small perennial plant species, reducing their capacity for annual forage production. The extent of overgrazing on gravel substrata was severe, but it was also significant on sand substrata. There was some evidence of localized dune stabilization in the camel exclosure, due to increased vegetation. Germination density of perennial species was greater in the camel exclosure, probably caused by higher seed production of the larger plants. Germination density of annual plant species was not affected by grazing, but was much greater in closer proximity to established small shrubs. No germination was observed to be associated with feces of camels, oryx, gazelle or Dhub lizards (Uromastyx aegyptiaca). Plants reached reproductive maturity at a height of 10 cm or less. Large shrubs were differentially impacted by grazing systems. Calligonum comosum was devastated by camel grazing. Leptadenia pyrotechnica and Lycium schawii were substantially reduced in size, though their long term impact is not yet known. Two species benefited from heavy grazing; the large shrub Calotropis procera and the sedge Cyperus conglomeratus. Among trees, the regeneration of Prosopis cineraria appears to have been severely reduced by herbivory at the small shrub stage, but no evidence of effects on Acacia tortilis was recorded.
Observed vegetation differences were primarily due to a greater level of grazing in the DDCR than the exclosure, but the ecological impact of camel grazing differs to that of oryx and gazelles. Rapid recovery within the camel exclosure indicates that plant species are well adapted to periods of heavy grazing, and ecological degradation in the DDCR is reversible. Nevertheless, complete recovery of plant species composition may take decades after a reduction of stocking rate. Recovery would benefit native wildlife, and also farmers by reducing their reliance of supplementary feed. Several options for reducing the impact of camel grazing are considered. -
Effects of Grazing on the Seed Germination in the Inland Desert of Dubai UAE
Effects of camel vs. Oryx and gazelle grazing on the plant ecology of the Dubai Desert Conservation Reserve
D.J. Gallacher & J.P. Hill
Zayed University, POB 19282 Dubai, United Arab Emirates
The effects of grazing on the seedling emergence was studied in a conservation reserve containing two enclosures; one with camels at high stocking rates (DDCR), and an enclosure of five years with gazelle and Oryx at lower stocking rates (Al Maha). Post-rainfall seed germination was measured within the two enclosures by counting and identifying all seedlings within 1m² plots. Germination varied enormously from place to place. The gravel substratum contained a very different mix of species than the surrounding dunes. Al Maha plots contained more species than DDCR plot, but the difference was mainly in seedlings of perennial rather than annual species. A greater density of annual species sprouted near established small shrubs, but it is unclear if this is due to local seed dispersal or soil conditions that favored both shrubs and seedlings. No germination was observed to be associated with feces of camels, Oryx, gazelle or spiny-tailed lizards. Plants reached reproductive maturity at a height of 10cm or less, reflecting the extreme aridity of the location. The observed differences among enclosures were probably due to a combination of livestock grazing and granivore effects on the seed bank, and microhabitat differences associated with the vegetation. -
Preservation of natural and cultural heritage on Dubai arid rangelands amid changing farmer lifestyles
Preservation of natural and cultural heritage on Dubai arid rangelands amid changing farmer lifestyles
Dr David J. Gallacher, Zayed University, PO Box 19282, Dubai, United Arab Emirates.
Manuscript of poster presentation for International Scientific Conference The Future of Drylands Tunis, Tunisia, 19 to 21 June 2006
Plant biomass of arid rangelands within the United Arab Emirates has been reduced by excessive grazing, and probably also by groundwater extraction. The reduction of annual plant biomass production is severe but reversible. It has caused population decline of native herbivores and carnivores, and has also reduced rangeland carrying capacity for livestock. Rangeland use by farmers has changed dramatically since the early 1980s due to increasing wealth and government policies to house and employ Bedu. In this study, nine farmers within the 225 km2 Dubai Desert Conservation Reserve were interviewed by telephone to assess their knowledge of the desert ecosystem, their attitudes toward conservation, and their current farming methods. Several farmers exhibited a sound knowledge of up to 100 species of plants and animals, but a poor understanding of rangeland management and the consequences of high stocking rates. Most had moved to the area after 1971, and had substantially increased their livestock numbers over the previous decade. This study highlights the need for improved awareness of rangeland sustainability, and indicates that farms could be relocated from the Reserve while maintaining both farmers' rights and their lifestyles. -
Vegetation of Dubai Desert Conservation Reserve, 2004
Vegetation of Dubai Desert Conservation Reserve: Initial Assessment and Baseline Data
By Husam El Alqamy, Conservation Officer, Dubai Desert Conservation Reserve
During the period of Jun 2004 until Feb 2005 a study was carried out to assess and quantify the vegetation cover and plant community in the Dubai Desert Conservation Reserve (DDCR). This was done to provide baseline data that will serve as the preliminary basis for temporal comparison, provided that monitoring is a continuously ongoing activity in DDCR. An emphasis was placed on assessing the density, cover and diversity of the flora of DDCR and in addition an attempt is made to map the vegetation of DDCR.
A total of 269 plots covering 1883000 m² were sampled over the DDCR and Al Maha Reserve (AMR). The sampling was done using plot sampling approach over the 2 main habitats; Gravel plains and Sand dunes. A standard of 10% coverage was maintained. In each plot several parameters were measured for each species; density, relative density, frequency, relative frequency, abundance, relative abundance and importance value. Diversity indices were used to quantitatively assess the diversity of plant communities in DDCR and to compare different habitats.
The floral diversity of DDCR includes approximately 37 species, 6 of which are trees, 26 are shrubs and dwarf shrubs while the remaining 5 are grasses.
Two major habitat types were identified, the Sand dunes and Gravel plains. Each is recognized for its unique terrain characteristics and floral community. The area is a good representation of the habitat of its surrounding ecosystem. Only 28 naturally occurring species were recorded throughout the study. Floral diversity is considered low to medium in DDCR.
DDCR and the AMR comprise one ecological unit as they are supposed to share the same physical and biological factors with the same processes occurring. However, land use and management regimes are drastically different in various parts of the region. In some areas severe overgrazing has been taking place over a long period and still occurs with increasing stocking rates, while in other areas strict conservation measures are in place for sustainable use of the resources. In conservation areas, grazing is replaced by wildlife herbivory thus representing a more practical image of a natural, dynamic desert ecosystem rather than excluding grazing completely. Thus the differences observed between the habitat structures in both areas are attributed to man-made impacts rather than natural processes.
The AMR showed better habitat quality compared to the DDCR and signs of habitat regeneration were evident, especially over the gravel plains habitat. This regeneration is not very drastic but this could be attributed to the relatively short period of conservation and the scarcity of rainfall. Biodiversity was increased in the Al Maha Reserve and diversity indices showed higher values and a tighter range of variation in Al Maha compared to those in DDCR. Densities of species that are still occurring on both areas showed the same drastic difference between the two areas emphasizing the impact of the livestock over grazing.
This investigation showed that the DDCR region is severely degraded and is exhibiting a high degree of habitat fragmentation. Analysis results showed that DDCR is composed of a very fragmented landscape that do not share the soil-type and flora communities over large continuums, rather it comprises a group of isolated islands with different properties. The scale of fragmentation is higher in the northern parts of the DDCR while in the southern part a large area was recorded as totally void of vegetation. These vegetation-void areas are occurring in the immediate vicinity of the two largest camel farms in the southern range of DDCR. Al Maha Reserve showed a more discrete pattern of habitat distribution. The landscape was observed to be more organized and continuums of homogenous habitats where more readily detectable and larger in spread over the study region. The landscape detected in Al Maha could be considered as the standard for Dubai Inland Desert except for the lack of tree species.
Gravel plains are only comprising small fraction of the total DDCR surface area (>10%). Nevertheless, unique floral species are recorded as only found on gravel plain and not on the dunes. These two facts makes it a higher priority to device special conservation measures and rules concerning gravel plains and all activities (off-road driving, grazing, tourism) involving them. Gravel plains must be assigned as very sensitive type of habitat in DDCR.
Fauna
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Are Desert Rodents a Suitable Indicator for Assessing Change in Ecosystem Health in the United Arab Emirates Inland Deserts?
Are Desert Rodents a Suitable Indicator for Assessing Change in Ecosystem Health in the United Arab Emirates Inland Deserts?
David McGrath
ABSTRACT
Given their reliance on vegetation for feeding and shelter, and importance as prey species, rodents present a potentially useful bioindicator of arid desert ecosystem health. The study aim is to build on the existing research conducted by the Dubai Desert Conservation Reserve in the area of inland desert of the United Arab Emirates. The study aims to investigate whether the enclosure of a protected desert reserve and implementation of land-use management practices ten years ago has improved ecosystem health in the reserve. Utilising data on rodent abundance, the study attempts to determine whether there is a discernible difference in ecosystem health inside and outside the reserve. Using a stratified random sampling approach, a total of 39 sites were identified and surveyed using live trapping with baited Sherman traps deployed from dusk until dawn. The data was collated and subjected to statistical analysis. The study shows a discernable difference in rodent abundance and species diversity within the DDCR compared to the NR areas outside of the reserve. The generalist Gerbillus cheesmani dominated the trap results were the only species recorded in traps set in dune habitat. Species richness and diversity were higher on gravel plain habitat within the DDCR, suggesting that recovery of the vegetation following exclosure allows for the support of a more diverse small mammal community. Further study would be warranted to determine seasonal variations and survey effort may need to be adjusted to target species that may not have been fully represented using the rapid transect methods employed in this study. -
Investigating optimal pit fall trap rim circumference for sampling surface dwelling arthropods in a desert habitat
Investigating optimal pit fall trap rim circumference for sampling surface dwelling arthropods in a desert habitat
Salma Elserafi
ABSTRACT
Pitfall trapping is one of the most extensively used methods for sampling surface foraging arthropods in ecological monitoring and biodiversity studies. Despite variations in trap design influencing catch rate and species composition, there is no standardisation protocol associated with pitfall trapping. Larger traps are known to increase catch rate and species richness sampled, but also increase handling and processing time and have been found to enhance the positive body size bias towards larger species. Many studies have investigated how to trap size influences the size bias and trapping efficiency but studies focused on optimal rim circumference are few. This study consisted of a single short sampling period, investigating the role of rim circumference in sampling surface-dwelling arthropods in an Emirati desert environment. Four rim circumferences (22, 27, 35 and 45 cm) were assessed across four sites (4 sizes, 20 replicates, 80 traps) on their diversity estimates and catch mean body length. To assess the strength of any catch body size bias, body length was compared between the pitfall size classes using one-way ANOVAs, and no consistent significant overrepresentation of larger-bodied species in larger traps was found. Three criteria were then considered in choosing optimal rim circumference; handling/processing time, ability to maximise species diversity and ethical consideration. The results suggest that the second-largest trap size was optimal. For the same number of traps and handling time, the 35 cm size class caught the highest number of species (>4) out of all the other traps (<4). Moreover, larger traps may increase the potential for trapping non-target species, further justifying the second-largest circumference as the optimum. -
Body Condition Scoring for the Arabian Oryx of the Dubai Desert Conservation Reserve
Body Condition Scoring for the Arabian Oryx of the Dubai Desert Conservation Reserve
Adèle Guidot
ABSTRACT
Medium-sized antelope, the Arabian Oryx is an indigenous species to step and desert areas of the Arabian Peninsula. This mammal was first introduced in 1999 in an area of 27 km2 in the Al Maha hotel complex situated 60 km South-East of Dubai and then relocated throughout a larger superficial of 225 km2 end of 2003, in what has been called since then “Dubai desert conservation reserve”. Following this major change, the population started to grow, and what was at first a herd of 70 endangered Arabian oryx in 2003, is now 400, making DDCR the largest free-roaming herd of its kind in the UAE (DDCR). It was however noticed that the body condition of the Arabian oryx throughout the years deteriorated, naturally explained by a larger population and therefore a lack of food. A new feeding management strategy was then adopted, in order to improve the health of the herds, assessed and measured by the body condition scoring. A scheme for body condition scoring is adopted as an approach to provide measurable, quantitative and informative indicator of the fitness of the Arabian oryx herd in (Gilbert and Woodfine, 2003). The BCS was in that case, measured by a visual perspective of the fat cover of the animal, its back posture, the appearance of musculature and spine. The scores vary from 0 to 5; 0 being emaciated and 5 being Obese. The Body condition scoring can be used as a health or nutritional deficiencies indicator, in order to control the feeding management of the herd and therefore its longevity but also reproduction rates. A new feeding program was implemented in 2013 and has overall remained the same since then. The purpose of this study is, therefore, to assess the efficiency of the 2013 feeding program, determined by the average score of the oryx population. It will also work as an indicator to the management, if there should be any adjustment to the feeding strategies or not, in order to keep the population as healthy as possible. The correct feeding strategy would give us an ideal score of three. -
Conservation of the Asian Houbara Bustard in the UAE-Cultural contexts and Initiatives
Conservation of the Asian Houbara Bustard in the UAE-Cultural contexts and Initiatives
Basil Roy
ABSTRACT
Over the past few decades the Asian Houbara Bustard (Chlamydotis macqueenii), and the African Houbara Bustard (Chlamydotis undulata) have been classified as vulnerable on the IUCN Red List. This phenomenon is due to the over-cultivation of the houbaras’ natural habitat, desertification, and the extensive hunting of the species. The houbara bustard is a historically symbolic bird, most notably associated with falcon hunting. The conservation of houbara is important for both environmental and cultural reasons. It has a unique status in Emirati culture. Just like the Arabian Oryx, the Houbara Bustard has been overhunted; and similarly, great efforts have been made to increase their populations. This paper focuses on the cultural position of the houbara, looking back on the historical significance of the houbara. Also, falcon hunters have been interviewed to determine attitudes regarding its cultural significance, the level of awareness regarding the vulnerability of the houbara, and whether or not they are willing to consider alternative hunting practices. This paper also discusses conservation efforts being done in the UAE. Working with conservation organisations such as The National Avian Research Center and the Dubai Desert Conservation Reserve allowed me to collect field data and determine whether or not these initiatives are successfully increasing houbara populations in the UAE. The U.A. E’s houbara conservation initiative is highly achievable given the right strategy and planning. Linking the survival of the houbara bustard to the ancient art of falconry has proved to be successful, not only conserving the United Arab Emirates natural environment but also its identity. -
Movement patterns of two Arabian Oryx (Oryx leucoryx) within a midsized reservation
Movement patterns of two Arabian Oryx (Oryx leucoryx) within a midsized reservation
David Gallacher
ABSTRACT
Movement behaviour of ungulates within a mid-sized arid rangeland reservation has implications for both conservation management and tourism. In this qualitative study, one male and one female Arabian oryx were tracked each 15 minutes for eight months using GPS collars in the 226 km2 Dubai Desert Conservation Reserve. Results were consistent with wild animals of the species for movement response to time of day, temperature, and rainfall. However, the oryx routinely used only 4.5% of their available range, despite having much larger ranges in wild populations. During summer months, the oryx actively sought drinking water on an almost daily basis, but utilized shade only opportunistically. Results were consistent with domesticated ungulates for toleration of anthropogenic proximity in exchange for artificial food and water, but avoidance of the DDCR boundary fence. An edge of 0.5 -1.5 km from the fence was breached only occasionally at night, and was unrelated to anthropogenic activity outside the fence. As the edge represents 18-48% of the reserve, carrying capacity could be improved by using artificial feed and water points to encourage animals into this area. -
Rodent community Structure and dynamics in Dubai Desert Conservation Reserve
Rodent community Structure and dynamics in Dubai Desert Conservation Reserve
Tamer Khafaga and Stephen Bell
The study aimed to provide a baseline survey of the rodent communities in DDCR; and to assess the community structure and the distribution of the individual rodent species and species distribution patterns on different habitat types (Sand Dunes and Gravel Plains)The survey consisted of 40 random selected points evenly distributed between the sand dunes and the gravel plains with 12 traps been placed 10m apart along the four compass directions. Trap lines were set for a period of 6 nights at each site. Trapping success tends to peak on days three, four and five. While autumn was the best season for trapping, New Moon and rain were the best moon phase and weather conditions respectively for trapping.
Four species of rodents were trapped during the yearlong survey namely;- Gerbillus cheesmani:The most common rodent in the reserve is which had been caught
- Meriones crassus: Trapped from four sites, 9 individuals were trapped consisting of 7 males and 2 females.
- Gerbillus nanus: Trapped in three sites, the 4 individuals caught all being male.
- Acomys cahirinus: Only trapped in one site a unique rocky habitat in the DDCR, Two individuals were trapped both which were males.
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Density of dens of the Red Fox (Vulpes vulpes) in the Dubai Desert Conservation Reserve
Density of dens of the Red Fox (Vulpes vulpes) in the Dubai Desert Conservation Reserve
Arabian red fox den density, occupation rates, and habitat preference was investigated within the Dubai Desert Conservation Reserve. A total of 168 dens were located, of which only 64 were active. Dens sites were mainly established in sandy plains with predominance of Leptadenia pyrotecnica (order: family), with low human disturbance. A single camera trap was used on a rotational basis at six different dens to provide further insight into den utilization by Arabian fox.
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Leptien’s Spiny-tailed Lizard (Uromastyx aegyptia leptieni) in the Dubai Desert Conservation Reserve
Leptien’s Spiny-tailed Lizard (Uromastyx aegyptia leptieni) in the Dubai Desert Conservation Reserve
Simkins GD and Ingram R
Conservation Manager, DDCR, greg.simkins@emirates.com
Leptien's spiny-tailed lizard (Uromastyx aegyptia leptieni), endemic to the UAE and Oman, are large herbivorous lizards found on gravel terrain and inter-dune compact soils. They can grow up to 75cm long and usually live in loose colonies. As Spiny-tailed lizards are part of the herbivore community in the DDCR and were directly affected by low vegetation density and off-road driving in the past, it was decided that a baseline survey of their numbers, distribution and density needed to be conducted.
The survey was conducted during October 2008 and May 2009 and focused on the burrows of the Spiny-tailed lizards. Transects across the gravel plains were surveyed and burrows were classified into three categories (Active, Inactive & Abandoned) according to the presence or absence of activity. The survey was divided into two areas the Al Maha Reserve AMR and the rest of the DDCR.
The results showed a healthy population of lizards in the DDCR with 448 active burrows and a further 48 inactive. A high number of abandoned burrows (740) were also found and has been attributed to both relocation and predation. As expected, the majority of the DDCR population (48%) were found within the AMR where the population density was much higher as result of a more suitable habitat due to longer protection from overgrazing and off-road driving.
The results from this survey form a good base for the continued monitoring the Spiny-tailed lizard population as well as a platform for more detailed studies of the species in the DDCR. -
Re-introduction of Arabian Oryx into the Dubai Desert Conservation Reserve
Re-introduction of Arabian Oryx into the Dubai Desert Conservation Reserve, Dubai, UAE
Greg Simkins
Conservation Manager, Dubai Desert Conservation Reserve,
P. O. Box 7631, Dubai, UAE
Arabian Oryx (Oryx leucoryx) are endemic to the Arabian Peninsula, with a historically range across Oman, Saudi Arabia, Jordan, United Arab Emirates, Yemen, Kuwait and Iraq. They are the largest of the antelopes in the region and are extremely well adapted to the extremely arid environment and are culturally significant. For these reasons they were reintroduced into the Dubai Desert Conservation Reserve (DDCR), an area of 225 km² in the emirate of Dubai in the UAE. The area is characterized by sand dunes interspersed with gravel plains. The reintroduction project aim at providing a viable breeding population of Arabian Oryx, within a diverse desert landscape, that could be observed by visitors to the DDCR.
Initially 118 individuals were released into the Al Maha Reserve and provided with supplementary feed, artificial shelter and water, in order to encourage the stated aims of having a breeding population and of increasing the biodiversity of the reserve.
At the end of 2003 and in March 2004 established herds of 17 and 24 respectively were translocated into separate locations in the northern area of the DDCR. A further release in April 2005 was done by moving one of the feeding stations from the AMR into the DDCR. The separation of the AMR and the DDCR is now more permeable allowing Oryx to move freely between the two areas and this has lead to the natural formation of free ranging herds of Oryx. As of May 2008 approximately 270 Arabian Oryx occur within the DDCR of which approximately 50 are independent of supplementary feed or artificial shelters.
Arabian Oryx are well established within the DDCR, breeding continues to be successful and self sustaining herds although small do now occur within the reserve
The reintroduction has not impacted of the biodiversity of the DDCR. In fact there has been and continues to be an improvement in flora and fauna within the reserve.
Over 200 000 people visited the DDCR in 2007 through good practice and education of tour operators this is being done in a sustainable manner. -
Camera Trap Survey in the Dubai Desert Conservation Reserve
Camera Trap Survey in the Dubai Desert Conservation Reserve
Husam El Algamy & Greg Simkins
Dubai Desert Conservation Reserve, P.O. Box 7631, Dubai, U.A.E. greg.simkins@emirates.com
In order to achieve the aim conserving the natural resources of Dubai's inland desert and to restore the natural fauna and florato its original bio-diversity it was decide to carry out a number of surveys to asses the current situation. In particular very little was known about species belonging to the order Carnivora so the following questions were asked:- What wild carnivore species are to be found in the DDCR?
- What is the distribution of these species?
- What is the population size of these species?
- Are there any feral species and where are they concentrated?
It was decided that the best method to answer these questions was to utilize camera traps. Camera traps have the advantage of detecting, with equal efficiency, nocturnal and diurnal activities while having minimal environmental disturbance. In addition to animal detection, camera traps can provide additional information about patterns of activity and habitat use.
The main focus of the survey was to assess the presence and distribution of the following species: Gordon's wild cat (Felis silvestris gordoni); Sand cat (Felis margarita); Caracal (Felis caracal schmitzi); Arabian red fox (Vulpes vulpes arabica); Sand fox (Vulpes ruepelli). In order to attract these species the camera traps were baited with meat on a regular basis.
Sampling was done over a period of 1029 active camera days at seven sites over the study area of the DDCR. These sites were representative of most habitats and vegetation cover types present in the DDCR and resulted in 1991 pictures. The pictures are classified in to four categories: 1) Test; 2) Empty; 3) Malfunction; 4) Live. A total of 1286 (64.59%) were classified as "Live" pictures and were then sorted as follows: a) Wild mammals; b) Wild birds; c) Grazing livestock; d) Feral mammals, before being used for further analysis.
Mammal fauna of the Dubai inland desert have been badly impacted by decades of unsustainable utilization of the desert habitat with un-controlled access for different activities such as livestock grazing and off-road driving. This has been shown in the results with only two of the target species being recorded and it can be concluded with confidence that species such as the Sand cat, Caracal and Sand fox are absent from the DDCR. The Arabian red fox and Gordon's wildcat are the only remaining small to medium sized predatory mammals left in the reserve. While the Arabian red fox population is relatively abundant the Gordon's wildcat population is suppressed and could be classified as threatened within the area. The main reason for the pressure on the wildcat population is through competition with feral cats which compete for food resource and territory and at the same time threaten the genetic integrity of the species by hybridization.
This survey has shown that the diversity of predatory mammals within the DDCR is critically low and that serious conservation measure are required to protect the remaining species as well as focusing on the potential re-introduction programs for both Sand fox and Sand cat in the near future.
Arthropods
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A New Species of the Genus Palarus
A New Species of the Genus Palarus (Hymenoptera: Crabronidae)
Wojciech J. Pulawski and Sarah K. Gess
A new species, Palarus inexspectatus, is described from Dubai. It is closely similar to Palarus jaxartes Pulawski and Prentice, from which it differs by details of the elevation of the sternum II and color, the male also by the flagellomeres II-IX distinctly angulate near the midlength, the presence of a midtibial spur, and the shape of tergum VII. Three females and two males were collected on the flowers of Heliotropium kotschyi Gürke (Boraginaceae), and one male on those of Calligonum comosum L’Herit (Polygonaceae). One prey, a male Bembix hauseri Schmid-Egger, was taken from a nesting female. The nest, a sloping burrow, had been excavated.
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A preliminary survey of flower visiting by aculeate wasps and bees in the Dubai Desert Conservation Reserve, UAE
A preliminary survey of flower visiting by aculeate wasps and bees in the Dubai Desert Conservation Reserve, UAE
Sarah Kathleen Gess1, Peter Alexander Roosenschoon2
The present contribution is a first brief attempt to give an overview of flower visiting by aculeate wasps and bees in the Dubai Desert Conservation Reserve (DDCR), and as far as has been established the first of its kind for the United Arab Emirates. Seventeen sites within the reserve were well sampled and, in order to see the reserve in relation to its position in the peninsula, two one day transects were undertaken, one of brief sampling at six sites east from the reserve to the coast at Khor Kalba and the other of brief sampling at five sites west from the reserve to the coast in the marine reserve of the Emirates Marine Environmental Group (EMEC). Flower visitors were observed and sampled on 21 species of plants within the DDCR and on two additional species east of the DDCR and two west of the DDCR. Fifty-one species of aculeate wasps and 27 species of bees were recorded. Of the wasps, 34 species were from the DDCR and the ad¬ditional 15 from transects east and west of the Reserve. Of the bees, 23 species were from the DDCR and the additional two from transects east and west of the Reserve. Flower sampling yielded flower visiting records for 39 species of aculeate wasps and 23 species of bees. Although this preliminary survey of flower visiting by wasps and bees in the DDCR was conducted over a limited period of time, during a dry spring, following seven dry years, it has provided sufficient data to draw some general conclusions: most of the plants attract visits from a complex of both wasps and bees; the flowers of some plants attract a wide range of wasps and bees but there were no flowers that were attractive to all available wasps and bees at any one site; very few species of the wasps and bees encountered were specialists; and the plants on which these specialist wasps and bees were dependent were not themselves dependent on these species for pollination.
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Spiders of an open desert eco-systems
Spiders of an open desert eco-systems
The Arachnid Survey in the DDCR was done over several days. 99 specimens was collected during the survey comprising a total of Nine Families; Araneidae, Eresidae, Gnaphosidae, Lycosidae, Oxyopidae, Pholcidae, Saticidae, Sparassidae, and Zodariidae. The specimens that were not confirmed were sent off for further identification. A total of nine locations were visited during the summer months and two of these locations were revisited in the middle of November, where the abundance was much lower than in the summer. Spiders were found in many different habitats but the large diversity and abundance was collected on the irrigated gravel plains, this will indicate that the spiders prey species are more prevalent. The Evippa arenaria was most prevalent and dominant spider species on the survey area
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Insect Biodiversity and Distribution of the Dubai Desert Conservation Reserve
Insect Biodiversity and Distribution of the Dubai Desert Conservation Reserve
By: Peter Roosenschoon
This Arthropod study was conducted in the Dubai Desert Conservation Reserve (DDCR). The reserve is located on the border between Sharjah and Abu Dhabi. The habitats of the reserve are dominated mainly by low-to-medium size sand dunes and interspersed gravel plains. This reserve is a perfect site to observe and collect different Arthropod species. Although this survey was aimed on the biodiversity and the distribution of the species found on the reserve has indicated that the Dominant species of the reserve is that of the Hymenoptera Order and more specific Short-wing wasp (Komarowia concolor). The IVI, Important Value Index. 65.26% this recorded over a trapped 140 trap-nights period. The Co-dominant species was of the Order Coleoptera and of the Family of Tenebrionidae, the Rack beetle (Tentyrina palmeri) with an IVI of 61.91%. The survey indicated that the trapping success of the three methods, the Light trapping, Pitfall-trapping and Malaise trapping, thus the Light trapping was most successful and the Malaise trapping the least.
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A Presence/ Absence Study in an Arid Desert Environment
Arthropods: A Presence/ Absence Study in an Arid Desert Environment.
By: Peter Roosenschoon.
This Arthropod study was conducted in the Dubai Desert Conservation Reserve (DDCR). The reserve is located on the border between Sharjah and Abu Dhabi. The habitats of the reserve are dominated mainly by low-to-medium size sand dunes and interspersed gravel plains. This reserve is a perfect site to observe and collect different Arthropod species. Although this study focused mainly on few species; the presence of these species in all habitats was observed. The study indicated that there are 7 Classes of Arthropods within the reserve; of which it has been observed that the Insecta Class is the largest with 13 Orders, more than 50 Families and over 140 Species. Furthermore; this study has supported the collection of specimens for a reference library. The collection process is an ongoing project.
Biosphere Expeditions
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Biosphere Expeditions - Arabia
Biosphere Expeditions - Arabia
Biosphere Expeditions is an international non-profit wildlife volunteer organisation, founded in 1999, that runs conservation expeditions for environmental volunteers all across the globe. With our conservation expeditions we hope to make a small but significant difference to our biosphere and at the same time bring enjoyment and fulfilment to our environment volunteer teams.
The Arabia Expedition, conducted in January every year since 2012, focuses on research of the Arabian oryx and other desert species in the fascinating and iconic sandy desert landscape of the Arabian Peninsula. Working alongside scientists from the Dubai Desert Conservation Reserve, volunteers will be part of a small international team, monitoring Arabian oryx, Gordon's wildcat, sand fox, mountain and sand gazelles, as well as other flagship species of the desert. From a comfortable oasis field camp, volunteers will venture out in the expedition 4WDs and on foot to study antelope behaviour and social structures, camera- and live-trap Gordon's wildcat and sand fox, and monitor them by radio and GPS telemetry. All this to ensure the survival of these important flagship desert species in their beleaguered world.
Data collected has been compiled into annual reports which have covered Arabian Oryx Body condition scores, monitored species distribution across the reserve through direct observations as well as camera trap data, trapping success for wildcats and rodents and monitoring of Red Fox populations through den monitoring. Furthermore this data is then utilized to inform management decision to benefit the overall protection of the Dubai Desert Conservation Reserve.
Ecology
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Proximity to urban fringe recreational facilities increases native biodiversity in an arid rangeland
Proximity to urban fringe recreational facilities increases native biodiversity in an arid rangeland
Tamer Khafaga, Greg Simkins & David Gallacher
ABSTRACT
Urban development’s affect neighbouring ecosystems in multiple ways, usually decreasing native biodiversity. Arabian arid rangeland was studied to identify the primary causes of biodiversity variation. Al Marmoom is a 990 km2 area on the urban edge of Dubai, designated for ecological ‘enhancement’ and outdoor recreational use. The area lacks historical biodiversity data but is thought to be primarily influenced by Arabian camel (Camelus dromedarius Linnaeus, 1758) herbivory. Perennial floral and faunal diversity was assessed at 54 sites. Counts of reintroduced ungulates (Arabian oryx Oryx leucoryx (Pallas, 1777), Arabian gazelle Gazella gazella cora (C.H. Smith, 1827) and sand gazelle G. subgutturosa marica (Thomas, 1897)) were made at 79 separate sites. Correlations of observed biodiversity with substrate type, anthropogenic structures, and ungulate distribution were assessed. Native biodiversity was substantially higher in north-north-west locations near recreational facilities, with the most likely cause being differential browsing pressure. Camel browsing faced greater communal regulation in the north-north-west, whereas oryx and gazelles congregated at feed points in the south-south-east that were farther from human activity. Arid rangeland in this socio-ecological landscape exhibits greater natural biodiversity at the urban fringe. Human activity reduces ungulate density, enabling a greater diversity of perennial flora, which then attracts non-ungulate fauna. Anthropogenic features can, therefore, offer conservation value in landscapes where ungulate populations are artificially elevated. -
Ecosystems as Commodity Frontiers - Challenges Faced by Land Set Aside as Protected Areas
Ecosystems as Commodity Frontiers - Challenges Faced by Land Set Aside as Protected Areas
Brigitte Howarth, Tamer Khafaga, Greg Simkins & Sabrina Joseph
ABSTRACT
This chapter examines natural habitats in Dubai, UAE that the state has demarcated as protected areas (PAs) in an attempt to utilise them for recreational/economic purposes while also mitigating habitat fragmentation. The authors employ the concept of the ‘commodity frontier’ to demonstrate how these PAs have contributed to the ongoing commodification of land that began with the rise of modern agriculture in the mid-twentieth century. The rise of the oil economy in the mid-twentieth century stimulated significant development that, over time, has resulted in ecological degradation. In line with state conservation agendas aimed at greening the desert and preserving biodiversity, PAs also serve as a mechanism for promoting tourism. Ironically, these activities have, in turn, put further pressure on the country’s natural resources and desert ecology. The authors also present an example of a PA that has been effectively managed and could serve as a model of sustainable development.