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首页> 外文期刊>Global Ecology and Conservation >Historical population decline and habitat loss in a critically endangered species, the Chinese alligator (Alligator sinensis)
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Historical population decline and habitat loss in a critically endangered species, the Chinese alligator (Alligator sinensis)

机译：濒危物种中国扬子鳄的历史种群下降和栖息地丧失

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Habitat loss and degradation are among the leading causes of local extinctions, so it is crucially important to preserve and restore the remaining critical habitat increasingly critical to conserve biodiversity. However, mechanisms driving species extinction often begin with habitat loss and seldom are well understood, which is greatly limits our ability to mitigate their impacts. The Chinese Alligator ( Alligator sinensis ) is a critically endangered crocodilian, which is narrowly distributed in very small six regions of Anhui province, China. In the present study, we used 9 nuclear microsatellite loci genotyped across the taxon's distribution area to investigate genetic variation and population demography in A. sinensis . The Chinese Alligator showed unusually low levels of genetic diversity ( N a, 5.44; N e, 1.97; H e, 0.47) based on 793 individuals. Msvar analyses found recent signals of population decline reflecting a bottleneck (an approximately 9-fold decrease) about 25,000 years ago. Ecological niche modelling indicated that the habitat area has declined (about 8–15 fold) for A. sinensis when compared with that under different historical climatic conditions. Our results indicated that population decline and habitat loss in critically endangered Chinese Alligators may have acted as intrinsic and extrinsic factors that have impacted the current status of A. sinensis . In addition, these two unfavorable factors may have also directly contributed to a reduction in the genetic diversity of A. sinensis .
机译：栖息地的丧失和退化是局部物种灭绝的主要原因，因此，至关重要的是保护和恢复剩余的重要生境，而这些生境对于保护生物多样性越来越重要。但是，导致物种灭绝的机制通常始于栖息地丧失，很少有人了解，这极大地限制了我们减轻其影响的能力。扬子鳄（Alligator sinensis）是一种濒临灭绝的鳄鱼，分布在中国安徽省很小的六个地区。在本研究中，我们使用了在整个分类群分布区域进行基因分型的9个核微卫星基因座，以研究中华按蚊的遗传变异和种群人口统计学。扬子鳄基于793个个体显示出异常低的遗传多样性水平（N a，5.44; N e，1.97; H e，0.47）。 Msvar分析发现，最近的人口减少信号反映了大约25,000年前的瓶颈（减少了大约9倍）。生态位模型表明，与不同历史气候条件下的中华A相比，其栖息地面积有所减少（约8-15倍）。我们的结果表明，极度濒危的扬子鳄的种群减少和栖息地丧失可能是内在和外在因素，影响了中国中华。的现状。另外，这两个不利因素也可能直接导致中华曲霉的遗传多样性降低。

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