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Proximity to urban fringe recreational facilities increases native biodiversity in an arid rangeland

  • King Salman Royal Nature Reserve Development Authority
  • Dubai Desert Conservation Reserve

Abstract and Figures

Urban developments affect neighbouring ecosystems in multiple ways, usually decreasing native biodiversity. Arabian arid rangeland was studied to identify the primary causes of biodiversity variation. Al Marmoum 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 camel herbivory. Perennial floral and faunal diversity was assessed at 54 sites. Counts of reintroduced ungulates (Arabian Oryx, Arabian and Sand Gazelle) 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-northwest locations near recreational facilities, with the most likely cause being differential browsing pressure. Camel browsing faced greater communal regulation in the north-northwest, while oryx and gazelles congregated at feed points in the south-southeast 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.
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Proximity to urban fringe recreational facilities increases native
biodiversity in an arid rangeland
Tamer Khafaga
, Greg Simkins
and David Gallacher
Universidad de Málaga, Avenida de la Estación de El Palo, 4, 29017 Málaga, Spain.
Dubai Desert Conservation Reserve, PO Box 191177, Dubai, United Arab Emirates.
Department of Interdisciplinary Studies, Zayed University, PO Box 19282, Al Ruwayyah, Dubai,
United Arab Emirates.
Corresponding author. Emails:;
Abstract. Urban developments affect neighbouring ecosystems in multiple ways, usually decreasing native biodiversity.
Arabian arid rangeland was studied to identify the primary causes of biodiversity variation. Al Marmoum is a 990 km
on the urban edge of Dubai, designated for ecological enhancementand outdoor recreational use. The area lacks historical
biodiversity data, but is thought to be primarily inuenced by Arabian camel (Camelus dromedarius Linnaeus, 1758)
herbivory. Perennial oral 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 socioecological landscape exhibits
greater natural biodiversity at the urban fringe. Human activity reduces ungulate density, enabling a greater diversity of
perennial ora, which then attracts non-ungulate fauna. Anthropogenic features can therefore offer conservation value in
landscapes where ungulate populations are articially elevated.
Additional keywords: anthropogenic, browsing, camel, herbivory, peri-urban, ungulate.
Received 1 May 2017, accepted 8 October 2018, published online 2 November 2018
Urban fringes are normally associated with a reduction in native
biodiversity (Hansen et al.2005; Bekessy et al.2012), and
urban expansion is one of the leading causes of local extinctions
(Marzluff 2008). However, outer urban fringes sometimes
exhibit increased biodiversity, likely due to increased habitat
diversity that includes faunal access to resource-rich gardens
(McKinney 2002). Total phytomass may increase with groundwater
changes, which typically include an increase in both volume and
pollutants (Simon 2008). In such cases, the apparent ecological
health is controversial because the modied urbanrural
transitional landscapes favour immigrant species (Walker et al.
A healthy ecosystem of predominantly native species
has value beyond the preservation of natural heritage. High
biodiversity has a positive psychological effect (Carrus et al.
2015), and people are more connected with the natural
ecosystem of the region if that ecosystem reaches close to
their homes (McKinney 2006). Community participation is a
necessary component of long-term sustainability of conservation
efforts (Seddon 2000), but such participation may be problematic
in societies that retain a predominance of anthropocentric
over ecocentric values (Gagnon Thompson and Barton 1994).
Arabian camels (Camelus dromedarius Linnaeus, 1758) and
dates (Phoenix dactylifera L.) are held in high regard within
the Arabian culture, and edible species are held in higher regard
than species with little or no economic value (Seddon and Khoja
2003). Abu Dhabi Media Co. operates a television station
devoted to traditional sports, with camel racing as its primary
focus. Societies tend to conserve the species they value, to
the extent that the real environment often becomes a partial
reection of social attitudes (Ouis 2003).
Camel herbivory is frequently cited as the main cause of
rangeland decline on the Arabian Peninsula (Batanouny 1990;
Assaeed 1997;Ferguson et al.1998; Abed and Hellyer 2001;
Hegazy and Lovett-Doust 2016). Camels have been present
for millennia (Peters 1997), but social, cultural and political
effects have resulted in a population explosion (Al-Rowaily
1999) since the end of the Second World War (Heady 1963).
Camel herbivory suppresses phytomass and reduces the proportion
Journal compilation Australian Rangeland Society 2018
The Rangeland Journal
of more palatable small perennial plants on all land surfaces,
but more severely on gravel substrate (Gallacher and Hill 2006).
Camel herder settlements are scattered throughout the Dubai
rangeland (Gallacher 2010), but camel densities are highest
around racetracks and are not directly associated with rangeland
provision of feed or water (Yagoub and Hobbs 2003). Land
tenure is not always clear and is traditionally based on water
access rather than geographical boundaries (Wilkinson 1983).
Land tenure in the bordering Abu Dhabi emirate is legally
dened (The General Secretariat of the Executive Council of
the Emirate of Abu Dhabi 2015), though enforcement is unclear
and the emirate boundary is porous. Rangeland access for
camel herders is thus regulated communally within Dubai
emirate, with few restrictions through unfenced rangeland or
across emirate boundaries.
In the present study, the ecological status of an arid rangeland
zone on the southern edge of Dubai emirate was assessed as
part of a proposal for extending an ecological recreation zone.
There appeared to be more plant growth in areas bordering
recreational facilities, and it was hypothesised that proximity
to an urban fringe recreational facility inuences the biodiversity
of native faunal and oral species. Possible mechanisms for
increased biodiversity might include the provision of resources
(gardens, groundwater), the distribution of seeds, and the
suppression of browsing by livestock (camels) and native
ungulates (Arabian oryx Oryx leucoryx (Pallas, 1777), Arabian
gazelle Gazella gazella cora (C.H. Smith 1827) and sand
gazelle G. subgutturosa marica (Thomas, 1897)).
Materials and methods
Study site
Al Marmoum is a 990 km
open-access, protected area of
interspersed gravel plains and sand dunes on the inland fringe
of Dubai metropolitan area (Fig. 1). The area is hyper-arid, with
high summer temperatures, low rainfall of ~80 mm annually, and
lying in the humid coastal zone of the United Arab Emirates
(Böer 1997). Al Marmoum is bordered by the fenced 225 km
Dubai Desert Conservation Reserve (DDCR), a 62 km
military area, and the open-access arid rangelands of Abu Dhabi
emirate. Two unfenced, sealed roads cross the area, intersecting
perpendicularly. Camels and ungulates can move freely within
the United Arab Emirates, but cannot cross major roads or enter
fenced spaces such as the DDCR. Approximately 120 camel
enclosures are scattered throughout Al Marmoum. Enclosures
are comprised of one or more fenced areas, usually of ~200 m
each, and may include buildings. Information on the ownership
of camel enclosures in Dubai Emirate is lacking, though
Abu Dhabi
0 2.25 4.5 9 13.5 18 Kilometers
Map produced by:
Random Survey Points
Ungulate sites
Gravel Plains
Sand Dunes
Sand Stone
Main Roads
Secondary Roads
Desert Tracks
Cycle Tracks
Endurance Tracks
DM Ghaf Plantations
Fenced areas
Crop Land
Gravel Plains
Study area
AI Marmoom
Study area
Fig. 1. Map of the Al Marmoum open-access nature reserve, and its location within the United Arab Emirates (inset).
BThe Rangeland Journal T. Khafaga et al.
a general description of rangeland farms and livestock
enclosures has been published (Gallacher 2010). Camel diets
are only partially provided by rangeland, with the primary
source being provided within the enclosure from non-rangeland
sources. Hence, rangeland browsing pressure is strongly
inuenced by animal husbandry practices and is signicantly
lower than would be surmised from camel density estimates.
Several recreational facilities are provided within Al
Marmoum, with more being proposed. Currently available are:
*Dubai International Endurance City; includes soil-graded
equestrian circuits, the longest being 160 km, and 15 km
stables and other facilities for the Dubai Equestrian Club.
*Al Qudra Cycle Track; includes tarmac cycle circuits, the
longest being 100 km, and facilities for patrons (bicycle hire,
cafeteria, changing rooms).
*Al Qudra Lakes; includes 14 km
of irrigated forests and
lakes, developed for day trips and overnight camping. Forest
species are mostly indigenous, though the high tree density
and placement on gravel substrate do not mimic natural
systems. The 40 lakes contain a mix of native and introduced
fauna, with a notably large population of ducks. Note that the
singular term Al Qudra Lakerefers confusingly to a separate,
older lake associated with the Bab Al Shams Resort.
*Bab Al Shams Desert Resort and Spa; a 113-room hotel with
*The Dubai Camel Racing Club is located on the areas
perimeter, with race tracks (the longest being 8 km) and
35 km
of stables and other facilities.
A further 6 km
is used for pivot-irrigated forage production
of Medicago sativa L., and 10 km
for the Mohammed bin
Rashid Al Maktoum Solar Park. The area encompasses three
archaeological sites, but there are currently no plans to open
these to tourism.
Herbivore populations are encouraged to reside in the area
via 67 xed feeding points, at which hay, water and shade are
provided ad libitum, and camels are exclosed via razor wire at and
above 1.5 m. Translocation has established populations of three
native ungulate and one bird species. Details were unavailable
regarding dates, numbers and sources of translocations, but likely
began around 2005. Arabian gazelle and sand gazelle were likely
introduced from a mix of captive and wild populations, and
Arabian oryx from captive populations only. Chlamydotis
macqueenii (J.E. Gray, 1832), the Asian houbara bustard, have
been released annually from captive-bred populations as part of
an ongoing release program at locations throughout the United
Arab Emirates. There have been unofcial reports of houbara
breeding colonies within Al Marmoum.
Data collection
Fifty-four sites were selected randomly within the existing and
proposed extension areas of Al Marmoum, using XTools Pro
16.1 plugin for ArcGIS to ensure representative sampling of
gravel and sand substrates. Perennial oral and faunal counts
were made from 7 to 16 August 2016 within a circle of 50 m
radius. Ephemeral plant species were absent during data
collection, but their distribution is not affected by ungulate
herbivory (Gallacher and Hill 2008). Perennial oral counts were
made on ve 10 10 m plots within the circle, including one
central, and one randomly selected within each quartile of
50 m radius. This sampling method is time efcient for
heterogeneously distributed sparse vegetation (McAuliffe
1990). Faunal counts of tracks, burrows, faeces, skeletons and
living individuals were made in the entire circle. Ungulates
and sighted individuals were classied to species, but other
artefacts were classied broadly (rodent, lizard, etc.). Vertebrates
comprised 93% of observations. Sites were further ranked
based on ground observations of the substrate and included
9 stable and 24 active dunes, 17 gravel and 3 sandy plains, and
1 sandstone site.
In addition to counts made at study sites, live ungulates
(Arabian oryx, Arabian and sand gazelles) were counted once
during August 2016 at each of the 67 xed feed points,
9 forested locations where feed had been provided, and
elsewhere when observed.
Data analysis
The ShannonWiener, Simpson and Margalef indices were
calculated for oral and faunal observations at each of the 54
sites. The rst two indices represent Types I and II diversity (Peet
1974), which are more sensitive to variation in abundant and
rare species respectively. The third is an estimate of actual
species richness from observed data. Inverse distance weighting
(IDW) was used to generate heat maps of the predicted diversity
throughout the study area. The relative importance of each
species was estimated using the importance value index (IVI),
in which relative density, frequency, abundance and cover are
given equal weighting (Curtis and McIntosh 1951). The IVI
provides a broader assessment of a species presence within a
community than single measures do (Shukla and Chandel 1989;
Sharma 2003).
Direct distances from each sample site were measured (using
Google Earth) to the closest anthropogenic xture for several
categories (sealed road, graded dirt road, plantation and/or
lake, a feeding point, cycle track, equestrian track, overhead
power line, camel enclosures, and non-farm buildings). Camel
enclosures were identied using Google Earth imagery, and
ranged from itinerant, small, fenced areas with a structure
providing shade, to permanent buildings with gardens and
livestock pens. The number of camels was assumed to vary
substantially from farm to farm.
Perennial oral diversity was considerably higher in the north-
north-west (Fig. 2a,b), where recreational facilities are located
(horse stables, equestrian and cycle tracks, resort facilities
and day/night camping areas), and was lower in the central
zone. Higher diversity on the southern edges of the reserve
bordered the township of Al Faqa and a worker accommodation/
industrial facility in Abu Dhabi emirate (24.67888N, 55.16318E),
though it was not consistently higher near the town of Murqquab
or a southern afforestation project (24.62458N, 55.40278E). All
plant species observed within sites were native. Faunal diversity
was also higher in the north-north-west and displayed greater
homogeneity than oral diversity, though this may be an artefact
of the sampling method. No evidence of non-native animal
species was detected.
Arid urban fringe biodiversity The Rangeland Journal C
Study Area
Low Diversity
High Diversity
0 2 4 8 12 16
0 1.75 3.5 7 10.5 14
Shannon Predicted Diversity
Study Area
Low Diversity
High Diversity
Shannon Predicted Diversity Study Area
Low Diversity
High Diversity
Study Area
Low Diversity
High Diversity
Study Area
Ungulates Predicted Distribution
0 2 4 8 12 16
0 2 4 8 12 16
0 2 4 8 12 16
(a) Shannon-Wiener floral diversity (b) Simpson’s floral diversity
(c) Shannon-Wiener faunal diversity (d) Simpson’s faunal diversity
(e) Ungulate count distribution
Fig. 2. Inverse distance weighted heat maps for Types I and II oral (a,b) and faunal (c,d) diversity indices and for ungulate counts (Arabian oryx, sand
gazelles and Arabian gazelles; e) in the Al Marmoum open-access reserve.
DThe Rangeland Journal T. Khafaga et al.
North-northwest South-southeast
Ungulate counts
- Flora
- Flora
- Flora
- Fauna
- Fauna
- Fauna
Richness index
Simpson index
Fig. 3. Quadratic correlations for oral (solid lines) and faunal (dashed lines) diversity indices, and ungulate
counts (dotdash lines; 8% of average count per site) along a gradient from the nor-north-west (north-north-
west) to the sou-south-east (south-south-east) of Al Marmoum reserve.
0.8 3.0
Active dunes
Stable dunes
Gravel plains
Sandy plains
Active dunes
Stable dunes
Gravel plains
Sandy plains
Active dunes
Stable dunes
Gravel plains
Sandy plains
Simpson’s Index Shannon-Weiner
Margalef’s Index
Fig. 4. Box-and-whisker plots of diversity indices for each of the ve vegetation types,
including stable (9) and active (24) dunes, sandy (3) and gravel (17) plains, and sandstone (1).
Arid urban fringe biodiversity The Rangeland Journal E
Table 1. Plant species observ ed among the ve habitat types, with life form (Raunkiær 1934), Impor tance Value Index (IVI) and frequency (percentage of plots in which the species
was observe d)
Family Life form; Raunkiær plant IVI Frequency Habitats (number of sites)
Species life-form
(%) Sand
stone (1)
plains (17)
plains (3)
dunes (9)
dunes (24)
Total habitat
Leptadenia pyrotechnica (Forsk.) Decne. Perennial shrub Ph 109 9  2
Arnebia hispidissima (Lehm.) DC. Annual herb Th 30 0.1 3
Heliotropium digynum (Forsk.)
Aschers. ex C. Christ.
Perennial shrublet Ch 11 6   3
Heliotropium bacciferum var. crispum
(Desf.) Sauvage and Vindt.
Perennial shrublet Ch 7 6  2
Moltkiopsis ciliata (Forsk.) I. M. Johnst. Perennial shrublet Ch 41 7  2
Dipterygium glaucum Decne. Perennial shrublet Ch 10 2 1
Cornulaca monacantha Delile Perennial shrublet Ch 45 0.04  2
Eremobium aegyptiacum (Spreng.) Asch. Annual herb Th 6 2 1
Farsetia linearis Decne. Perennial shrublet Ch 13 2 1
Cyperus conglomeratus Rottb. Perennial sedge Ge 153 65   5
Crotalaria aegyptiaca Benth. Perennial shrublet Ch 5 2 1
Indigofera colutea (Burm.f.) Merr. Perennial shrublet Ch 52 17  4
Indigofera intricata Boiss. Perennial shrublet Ch 21 9  4
Prosopis cineraria (L.) Druce Perennial tree Ph 72 6 1
Limeum arabicum Friedrich Perennial shrublet Ch 47 30   4
Monsonia nivea (Decne.) Decne. ex Webb Perennial shrublet Ch 46 13 2
Centropodia forsskaolii (Vahl) Cope Perennial grass Th/He 25 0.2  4
Coelachyrum pierceii (Benth.) Bor Perennial grass He 42 0.04 1
Panicum turgidum Forssk. Perennial grass He 51 19 4
Pennisetum divisum (J.F.Gmel.) Perennial grass He 16 7  2
Stipagrostis plumosa (L.) Munro
ex T.Anderson
Perennial grass He 55 46   5
Neurada procumbens L. Annual herb Th 18 4  2
FThe Rangeland Journal T. Khafaga et al.
A total of 615 Arabian oryx, 1098 Arabian and 650 sand
gazelles were observed, mainly in areas that were distant from
anthropogenic features, other than a road near the southern
border (Fig. 2e). Numbers were higher in the central-west and
south-south-east, approximately the opposite of both oral and
faunal diversity (Fig. 3).
Biodiversity was higher in stable than on active dunes, and
on sandy than on gravel plains (Fig. 4). This represented an
observed site richness difference of 2.5 and 3.8 on active
dunes, to 7.0 and 10.3 on sandy plains, for plant species
and animal artefacts. Three of the 29 observed plant species
were ephemeral, despite the timing of the study in summer.
Correlation between oral and faunal diversity among sites
was low (R
= 0.075, 0.122 and 0.045 for the Simpson,
ShannonWeiner and Margalef indices respectively), but
among habitat types was high (R
= 0.374, 0.728 and 0.945).
Cyperus conglomeratus Rottb. was the most widespread plant
species, with the highest IVI, frequency, and appearance
across all ve substrates (Table 1). Zygophyllum simplex L. was
common on gravel and Fagonia indica Burm. l. on sandy
substrates. Gazelle and rodent tracks were observed at many
active dune and gravel plain sites, and at all other sites.
Plant diversity was signicantly higher within 1 km of tree
plantations and lakes (P<0.003 for all three indices) and within
2.5 km of major roads (P<0.006 for all three indices). However,
anthropogenic features are clustered in the northnorth-west
along the eastwest main road, which follows a gravel plain,
and correlations became insignicant when this was taken into
account. Proximity to feeding points and camel farms showed
no correlation with diversity measures.
Native biodiversity was ~3-fold higher near established
anthropogenic facilities in the north, and somewhat higher near
some but not all communities in the south. Plant biodiversity is
low across the United Arab Emirates (Hegazy and Lovett-
Doust 2016), and observed diversity is lower in summer, when
ephemeral species are mostly present only in seed form. Some
perennial species of ecological signicance in the area did not
appear in sampling, including Acacia ehrenbergiana Hayne
and Calotropis procera (Ait.) Ait. l. Hence, the true plant
species richness may be higher than observed.
Historical data is unavailable to determine whether
biodiversity distribution pre-dates anthropogenic structures.
Location of anthropogenic structures has been inuenced by
substrate and proximity to the coast, and is unlikely to have
also been signicantly inuenced by biodiversity. Camel and
horse stables, towns, and solar facilities are located on gravel
plains, whereas forage production and the desert resort are
located on stable dunes. Variation in community self-regulation
of camel browsing throughout Al Marmoum could have caused
the observed spatial variation in biodiversity. Camel herders in
the north suggested the south has been, and continues to be,
overgrazed by intraday Abu Dhabibased herders.
Proximity to camel enclosures did not affect plant diversity
at the scale observed in this study, though we expect that a
specically designed transect study would nd differences at
smaller scales (tens of metres from enclosures). Moderate
Chrozophora oblongifolia (Delile)
A.Juss. ex Spreng.
Perennial shrub Ch 8 2 1
Lycium shawii Roem. and Schult. Perennial shrub Ph 9 2 1
Fagonia indica Burm. l. Perennial shrublet Ch 121 37  4
Tetraena qatarensis (Hadidi) Beier and Thulin Perennial shrublet Ch 65 11 4
Tribulus macropterus var. arabicus
(Hosni) F. Al-Hemaid and Jacob Thomas
Perennial herb Ch 54 4  2
Tribulus pentandrus Forsk. Perennial herb Ch 15 15  2
Zygophyllum simplex L. Perennial herb Th/Ch 127 33 1
Ch Chamaephyte; Ge Geophyte; He Hemicryptophyte; Ph Phanerophyte; Th Therophyte.
Arid urban fringe biodiversity The Rangeland Journal G
browsing can sometimes increase plant diversity through the
reduction of dominant species, but heavy browsing typically
reduces the richness of palatable species (Holechek et al.2010).
Observations of increaser and decreaser plant species were
mixed. The palatable grasses Panicum turgidum Forssk. and
Pennisetum divisum (J.F.Gmel.) Henrard were found only in
the north-north-west, and the palatable tree Calligonum
comosum LHér was not observed during the study, indicating
heavier browsing in the central and south-south-east regions.
However Calotropis procera, known to ourish under heavy
camel browsing (Gallacher 2010), was also not observed,
perhaps due to the presence of gazelles. Distribution of the
sedge Cyperus conglomeratus followed a similar pattern to the
ShannonWiener oral diversity (Fig. 2a), despite being an
early recoloniser of stressed habitats.
This study found no correlation between study-site
biodiversity and proximity to feeding points, but oryx and gazelle
densities were negatively correlated with site biodiversity and
proximity to human activity. These ungulates had ad libitum
access to non-rangeland food, water and shade sources at feed
points throughout Al Marmoum. It therefore appears they
preferentially inhabited areas away from people, using feed
points as their primary food source, and browsing on rangeland
vegetation nearby. Diurnal movement patterns of oryx and
gazelles were disrupted by reliance on feed points that provided
all their needs (food, water and shade) at a single location. In the
neighbouring DDCR, oryx utilised feed points, whereas gazelles
preferred rangeland vegetation if available. Oryx tend to disperse
uniformly during daytime and night-time browsing hours and
regroup at sunrise and sunset (Gallacher 2015). Ungulate
densities likely far exceed historical levels, but their level of
dependence on rangeland vegetation has not been measured.
Differential browsing is the most likely cause of the observed
spatial variation in biodiversity, due to camel herders using
areas that are less communally regulated, and other ungulates
avoiding human activity. Nevertheless, several other factors
could be contributing, including changes to groundwater, seed
bank production and dispersal, and faunal consumption of
irrigated vegetation. Groundwater distribution in the United
Arab Emirates has been substantially modied over the last
few decades through increased extraction and added recharge
sources (Murad et al.2007).
Protection from large herbivores is available for plants
in many anthropogenic structures, some of which also have
increased water availability. These areas may be important for
seed bank recharge of palatable species. Plants can grow far
larger with protection, and thus produce far more seeds than
plants without protection. Seed dispersal might also be affected
by faunal visits to irrigated spaces, and to anthropogenic activity
throughout the reserve. Equestrian tracks are regularly graded,
and on- and off-road vehicles of all sizes move throughout the
reserve. Higher site biodiversity appeared to be more associated
with fenced irrigated spaces than unfenced irrigated forests,
which is indicative that seed bank recharge might be signicant.
A primary cause of rangeland degradation in Arabia is
open-access livestock herbivory. Ungulates and herders tend to
avoid peri-urban rangeland. This study found native biodiversity
to be higher in arid rangeland that bordered Dubai urban
developments, compared with rangeland further inland. Whether
this represents an increase over historical levels or a reduced
decline, is not known. The likely mechanism is the inuence
of anthropogenic xtures on browsing pressure by camels, oryx
and gazelles. Within the study area, camel browsing faced greater
communal regulation in locations bordering anthropogenic
xtures, whereas oryx and gazelles selectively avoided these
areas. Anthropogenic xtures can therefore offer conservation
value in this landscape by reducing the impact of elevated
ungulate populations.
Conicts of interest
The authors declare no conicts of interest.
Many thanks to Dr Richard Hornby, Nautica Environmental Consultants,
for his thorough review of the manuscript.
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Arid urban fringe biodiversity The Rangeland Journal I
... Several fenceline studies comparing camel presence to absence have demonstrated increased plant biomass and biodiversity on the excluded side, particularly for herbaceous and smaller woody shrubs (Shaltout, El-Halawany, and El-Kady 1996;Gallacher andHill 2006a, 2006b;Ouled Belgacem, Tarhouni, and Louhaichi 2013;Al-Rowaily et al. 2015), but complete exclusion from herbivory is a socio-politically unsustainable management option for most rangelands. A dramatic increase of domesticated camel populations over the last few decades has displaced smaller wild ungulates in Dubai (Gallacher and Hill 2006b), and although the establishment of the Al Marmoum conservation reserve (Khafaga, Simkins, and Gallacher 2018) has reversed this trend, camels still far exceed sustainable levels across the Arabian Peninsula. An increase in livestock numbers has devastated Vachellia origena (Hunde) Kyal. ...
... It was believed that camel browsing suppresses all species studied except C. procera which then benefits from the reduced competition (Gallacher and Hill 2006b). However, population densities of all four species are lower in the Dubai emirate when access for the public, including camel herders, is permitted (Khafaga, Simkins, and Gallacher 2018). Camels can be selective; in a moister desert they avoided the low-height shrub Artemisia monosperma Del. even when palatable herbs and grasses became rare (Katz et al. 2016). ...
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 an 11-year period 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 prioritized over recruitment, and average lifespan was estimated at 95 years. Shrub responses to changes in ungulate management are therefore species-specific. Response of individual plant size was faster than response of population size, which was limited by slow sexual recruitment (L. pyrotechnica) or localized seed dispersal (C. polygonoides).
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The Middle East is one of several ‘cradles of civilization’ where people early on tamed plants and animals, domesticating a few and then living successfully off them and with them ever since. Middle Eastern plant ecology today includes the plants of primordial Gondwana and ancient Arabia felix; of Iranian ‘Hyrcania’ and the land south of the Caspian Sea; and fabled plants of the Torah, Bible and Koran. The region is generally dry and getting drier, yet it’s also home to spectacular cloud forests of southern Arabia. The region has been badly neglected in terms of its overall natural history and much of this remains relatively unknown. The plant ecology is just getting under way and a book seems timely. Major dryland families and regional plant communities are described. The high frequency of facilitative interactions, where certain ‘host’ species help others is noted. The book includes a ‘plant’s-eye-view’ of domestication and journeys through some 24 countries, highlighting five regional biodiversity ‘hotspots’ where the challenges of desertification, habitat loss, and other threats to plant biodiversity are acute. Populations of iconic long-lived tree species like the Dragon’s-blood tree, the Bankoualé Palm, and beautiful Mimusops trees are all mostly made up of elderly individuals. The book explores effects of long-term climate change and the isolation of climate relicts upon the ‘regeneration niche’ –i.e., upon the youngsters and adolescents of such species. Other chapters explore ‘deep-time’ effects, salt and halophytes, succulence and sclerophylly, specialized photosynthesis, opportunism and ‘bet-hedging’ strategies for flowering and dispersal.
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Movement behavior 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 km 2 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.
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 rangelands has moved from subsistence to a secondary income or hobby. Both ecological health and indigenous knowledge of 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). Inland desert rangelands are threatened by groundwater depletion, habitat fragmentation, exotic species introductions and overgrazing. The paper argues that 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.
Urban Ecology is the study of ecosystems that include humans living in cities and urbanizing landscapes. It is an emerging, interdisciplinary field that aims to understand how human and ecological processes can coexist in human-dominated systems and help societies with their efforts to become more sustainable. It has deep roots in many disciplines including sociology, geography, urban planning, landscape architecture, engineering, economics, anthropology, climatology, public health, and ecology. Because of its interdisciplinary nature and unique focus on humans and natural systems, the term "urban ecology" has been used variously to describe the study of humans in cities, of nature in cities, and of the coupled relationships between humans and nature. Each of these research areas is contributing to our understanding of urban ecosystems and each must be understood to fully grasp the science of Urban Ecology. Therefore, in Urban Ecology: An International Perspective on the Interaction Between Humans and Nature, we introduce students and practitioners of urban ecology to its roots, bases, and prospects by way of a diverse collection of historical and modern foundational readings. The editors are urban ecologists from the United States, Italy, and Germany who together view these readings as a fair representation of the importance of both natural and social sciences to Urban Ecology. This book presents important papers in the field of Urban Ecology that both set the foundations for the discipline and to illustrate modern approaches, from a variety of perspectives and regions of the world. The editors do this by reprinting important publications, filling gaps in the published literature with a few targeted original works, and translating several key works originally published in German. The aim of this collection is to provide students, practitioners, and professionals with a rich background in some of the core facets of Urban Ecology. © 2008 Springer Science+Business Media, LLC. All rights reserved.
Deforestation is one of the main factors negatively affecting the conservation of biological diversity. We assess the impact of deforestation on biodiversity in Mexico by quantifying its effect on (1) mammal species' distributions, (2) delineation of biogeographical regionalization, (3) the effectiveness of conservation area networks to prevent biologically deleterious land use/land cover change, and (4) area prioritization for biodiversity conservation. Deforestation has a significant impact on species' distributions with habitat loss ranging from 10-90%, leading in some cases to high risks of extinction. Significant changes also occur in the delineation of biogeographical provinces (bioregionalization) due to deforestation because several areas with unique fauna show high rates of natural habitat reduction, leading to potential ecological and biogeographical changes in species interactions and distributions. A variety of decreed natural protected areas now show increasing pressures due to potential land use conversion from natural habitat to agriculture and urban settlements which threatens their biodiversity content. Area prioritization for biodiversity conservation is seriously negatively affected by deforestation because a significantly increased total area is required to conserve endemic mammals as compared to what would have been adequate 30 years ago before significant loss of forest cover. These trends urge immediate collaborative actions between academic, governmental, and NGO sectors to prevent and reduce further deforestation nationwide.
Explanations of the differences between the traditional and modern notions of territory in the Gulf tend to emphasize the distinction between jus sanguinis and jus soli. The adequacy of such an explanation is examined in the context of South East Arabia with special attention being paid to the notions of territoriality amongst the nomads in whose dārs the creation of modern boundaries has been most arbitrary. After examining basic notions of ownership and the means by which allodial rights and precedence in the exploitation of natural resources are established, the article continues by examining the relationship with the functional needs for control of territory, notably demographic pressures on a sparse and fluctuating pastoral resource base. Notions of community, government and sovereignty amongst both the settled and the nomads are then sketched and related to the growth of nascent states through shaykhly control of nodes that give access to marine and land resources. The article concludes that it is meaningless to divorce soli and sanguinis, since we are dealing with a society in which both are intimately linked in a common jus. Some of the rulers of the Gulf appear to be reverting to these notions to regulate territorial differences between them (since the withdrawal of the British presence a decade ago). Their agreements constitute as valid an 'international' law as the Western notions of territoriality which have led to ludicrous fragmentation of sovereign rights over resources in the region. There is little reason to suppose that, because these agreements do not produce 'demarcated boundaries' they are any more unstable than if they were to do so.