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首页> 外文期刊>Environmental toxicology and chemistry >Pesticides in mountain yellow-legged frogs (Rana muscosa) from the Sierra Nevada Mountains of California, USA.
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Pesticides in mountain yellow-legged frogs (Rana muscosa) from the Sierra Nevada Mountains of California, USA.

机译：美国加利福尼亚山内华达山脉的山黄脚青蛙（蛙蛙muscosa）中的农药。

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摘要

In 1997, pesticide concentrations were measured in mountain yellow-legged frogs (Rana muscosa) from two areas in the Sierra Nevada Mountains of California, USA. One area (Sixty Lakes Basin, Kings Canyon National Park) had large, apparently healthy populations of frogs. A second area (Tablelands, Sequoia National Park) once had large populations, but the species had been extirpated from this area by the early 1980s. The Tablelands is exposed directly to prevailing winds from agricultural regions to the west. When an experimental reintroduction of R. muscosa in 1994 to 1995 was deemed unsuccessful in 1997, the last 20 (reintroduced) frogs that could be found were collected from the Tablelands, and pesticide concentrations in both frog tissue and the water were measured at both the Tablelands and at reference sites at Sixty Lakes. In frog tissues, dichlorodiphenyldichloroethylene (DDE) concentration was one to two orders of magnitude higher than the other organochlorines (46+/-20 ng/g wet wt at Tablelandsand 17+/-8 Sixty Lakes). Both gamma-chlordane and trans-nonachlor were found in significantly greater concentrations in Tablelands frog tissues compared with Sixty Lakes. Organophosphate insecticides, chlorpyrifos, and diazinon were observed primarily in surface water with higher concentrations at the Tablelands sites. No contaminants were significantly higher in our Sixty Lakes samples.
机译：1997年，在美国加利福尼亚内华达山脉两个地区的黄脚青蛙（Rana muscosa）中测量了农药浓度。一个地区（六十湖盆地，国王峡谷国家公园）有大量显然健康的青蛙。第二个地区（Tablelands，红杉国家公园）曾经有大量的种群，但是该物种在1980年代初已从该地区灭绝。高原地区直接暴露于西部农业地区的盛行风中。当在1994年至1995年的一次实验性重新引入粘液鼠李（R. muscosa）于1997年被认为不成功时，从高原上收集了最后20只（再引入）的青蛙，并在这两个地方测量了青蛙组织和水中的农药浓度。高原和六十湖的参考点。在青蛙组织中，二氯二苯基二氯乙烯（DDE）的浓度比其他有机氯（Tablelands和17 +/- 8 Sixty Lakes的湿重46 +/- 20 ng / g湿重）高一到两个数量级。与六十湖相比，发现在桌青蛙组织中γ-氯丹和反式九氯的浓度都明显更高。主要在高原地区的地表水中观察到有机磷杀虫剂，毒死rif和二嗪农。在我们的“六十湖”样本中，没有污染物显着更高。

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