Author:
Shalmon Benny,Sun Ping,Wronski Torsten
Abstract
Abstract
Wild populations of Arabian gazelles (Gazella arabica) were once common on the Arabian Peninsula, but today disappeared from large parts of their former range. In Israel only a small population of currently 30 individuals survived, although it was—and still is—well protected from illegal hunting and habitat destruction. In our study we aimed to identify the factors influencing the population growth of G. arabica in Israel over the last two decades (1995–2017). We tested the impact of five environmental variables including annual mean maximum temperature, rainfall, the availability of two major food plants, competition with sympatric dorcas gazelle (G. dorcas) and predation (mainly by wolves) on two dependent variables relating to population viability (population size, percentage fawn survival) using a retrospective time series analysis. After testing for autocorrelations, two generalized least squares (GLS) models with autocorrelations at 3 and 6 years [GLS-AR(3, 6)] were identified as the best models to explain environmental effects on populations size. Wolf encounter rate had a significant negative effect on G. arabica population size, while G. dorcas population size had a significant positive effect, suggesting that wolf predation shapes the population size of both gazelle species. For percentage fawn survival, model residuals did not reveal any significant autocorrelation and the best fit GLS-AR(0) model retained only wolf encounter rate and mean annual maximal temperature as significant predictors. This result suggests a strong impact of wolf predation and increasing temperatures on the fawn survival of Arabian gazelles. Changed rainfall patterns, food availability and competition between gazelle species had no impact on fawn survival.
Publisher
Springer Science and Business Media LLC
Subject
Nature and Landscape Conservation,Ecology,Ecology, Evolution, Behavior and Systematics
Reference83 articles.
1. Adamcik RS, Todd AW, Keith LB (1978) Demographic and dietary responses of great horned owls during a snowshoe hare cycle. Can Field Nat 92:156–166
2. Andelt FW, Althoff DP, Case RM, Gipson PS (1980) Surplus-killing by coyotes. J Mamm 61:377–378
3. Arsenault R, Owen-Smith N (2002) Facilitation versus competition in grazing herbivore assemblages. Oikos 97:313–318
4. Baharav D (1980) Habitat utilization of the dorcas gazelle in a desert saline area. J Arid Environ 30:161–167
5. Bärmann EV, Wronski T, Lerp H, Azanza B, Börner S, Erpenbeck D, Rössner GE, Wörheide G (2013a) A morphometric and genetic framework for the genus Gazella de Blainville, 1816 (Ruminantia: Bovidae) with special focus on Arabian and Levantine Mountain gazelles. Zool J Linn Soc 169:673–696
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