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首页> 外文期刊>Oryx >The precarious persistence of the Endangered Sierra Madre yellow-legged frog Rana muscosa in southern California, USA
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The precarious persistence of the Endangered Sierra Madre yellow-legged frog Rana muscosa in southern California, USA

机译：美国南部加利福尼亚濒临灭绝的塞拉·马德雷（Sierra Madre）黄脚青蛙蛙蛙（Rana muscosa）的per不休

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摘要

We conducted surveys for the Endangered Sierra Madre yellow-legged frog Rana muscosa throughout southern California to evaluate the current distribution and status of the species. Surveys were conducted during 2000-2009 at 150 unique streams and lakes within the San Gabriel, San Bernardino, San Jacinto, and Palomar mountains of southern California. Only nine small, geographically isolated populations were detected across the four mountain ranges, and all tested positive for the amphibian chytrid fungus Batrachochytrium dendrobatidis. Our data show that when R. muscosa is known to be present it is easily detectable (89%) in a single visit during the frog's active season. We estimate that only 166 adult frogs remained in the wild in 2009. Our research indicates that R. muscosa populations in southern California are threatened by natural and stochastic events and may become extirpated in the near future unless there is some intervention to save them.
机译：我们对整个加利福尼亚南部的濒临灭绝的马德雷山脉（Sierra Madre）黄腿蛙Rana muscosa进行了调查，以评估该物种的当前分布和状况。在2000年至2009年期间，对加利福尼亚南部的圣盖博，圣贝纳迪诺，圣哈辛托和帕洛玛山区的150个独特溪流和湖泊进行了调查。在四个山脉中仅检测到9个地理上较小的小种群，两栖动物的两栖真菌真菌Batrachochytrium dendrobatidis全部呈阳性。我们的数据表明，当已知存在R. muscosa时，在青蛙活跃期的单次访问中就很容易检测到（89％）。我们估计2009年野外只剩下166只成年青蛙。我们的研究表明，南加州的粘膜蛙种群受到自然和随机事件的威胁，除非有一些干预措施可以拯救它们，否则它们在不久的将来可能会灭绝。

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