Factors driving Arabian gazelles (Gazella arabica) in Israel to extinction: time series analysis of population size and juvenile survival in an unexploited population

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 a...

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Veröffentlicht in:Biodiversity and conservation 2020, Vol.29 (1), p.315-332
Hauptverfasser: Shalmon, Benny, Sun, Ping, Wronski, Torsten
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description 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.
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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. 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subjects Analysis
Annual rainfall
Autocorrelation
Biodiversity
Biological competition
Biomedical and Life Sciences
Climate Change/Climate Change Impacts
Competition
Conservation Biology/Ecology
Dependent variables
Ecology
Endangered species
Environment models
Environmental degradation
Environmental effects
Environmental impact
extinction
Extinction (Biology)
fawns
Food
Food availability
Food plants
Food processing plants
Food supply
Gazella
Gazella arabica
Gazella dorcas
gazelles
habitat destruction
Habitat loss
Hunting
Interspecific relationships
Israel
Juveniles
Life Sciences
Original Paper
Population
Population growth
Population number
population size
Population viability
Predation
Protection and preservation
Rain
Rain and rainfall
Rainfall
species
Species extinction
Survival
Sympatric populations
sympatry
Temperature
Time series
time series analysis
Wolves
title Factors driving Arabian gazelles (Gazella arabica) in Israel to extinction: time series analysis of population size and juvenile survival in an unexploited population
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