Multiple Factors Affect a Population of Agassiz's Desert Tortoise (Gopherus agassizii) in the Northwestern Mojave Desert
作者： Kristin H. Berry , Julie L. Yee , Ashley A. Coble , William M. Perry , Timothy A. Shields
DOI: 10.1655/HERPMONOGRAPHS-D-13-00002
关键词: Juvenile 、 Ecology 、 Adult size 、 Predation 、 Biology 、 Tortoise 、 Desert (philosophy) 、 Multiple factors 、 Population 、 Threatened species 、 Animal Science and Zoology 、 Ecology, Evolution, Behavior and Systematics
摘要: Abstract: Numerous factors have contributed to declines in populations of the federally threatened Agassiz's Desert Tortoise (Gopherus agassizii) and continue limit recovery. In 2010, we surveyed a low-density population on military test facility northwestern Mojave California, USA, evaluate status identify potential contributing distribution low densities. Estimated densities live tortoises ranged spatially from 1.2/km2 15.1/km2. Although only one death breeding-age tortoise was recorded for 4-yr period prior survey, remains 16 juvenile immature were found, most showed signs predation by Common Ravens (Corvus corax) mammals. Predation may limited recruitment young into adult size classes. To relative importance different types impacts tortoises, developed predictive models explicit sign using topograp...
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