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首页> 外文期刊>Freshwater science >Effects of nonnative Rainbow Trout on two species of endemic Mexican amphibians
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Effects of nonnative Rainbow Trout on two species of endemic Mexican amphibians

机译：非彩虹鳟鱼对两种地方墨西哥两栖动物的影响

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摘要

Introduction of nonnative salmonids into fishless aquatic ecosystems often can have negative effects on these ecosystems. Amphibians appear to be particularly susceptible to the introduction of trout. Nonnative Rainbow Trout (Oncorhynchus mykiss) have been introduced to Mexico, including to streams in the mountains around Mexico City that are home to several endemic Mexican amphibians. We examined the effect of Rainbow Trout on the distributions of 2 endemic Mexican amphibians, Ambystoma altamirani and Hyla plicata, in the Sierra de Las Cruces. Ambystoma altamirani was never found at sites with Rainbow Trout, and H. plicata was observed only once at sites with Rainbow Trout. Stream site characteristics, for the most part, did not vary among streams occupied by different species, suggesting environmental variables were not primarily responsible for the species distributions. Our results provide strong circumstantial evidence that the introduction of Rainbow Trout in streams in the Sierra de Las Cruces has a negative effect on the distribution of native Mexican amphibians.
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