Colonization of high-elevation lakes by long-toed salamanders (Ambystoma macrodactylum) after the extinction of introduced trout populations

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The authors surveyed high-elevation lakes for long-toed salamander (Ambystoma macrodactylum) larvae and trout in the northern Bitterroot Mountains of Montana in 1978, 1997, and 1998. Objectives were to 1) test whether trout exclude salamander populations, 2) determine whether lakes in which trout have gone extinct have since been colonized by salamanders, and 3) estimate the rates of population extinction and colonization in lakes never stocked with trout. As found in previous work on the interactions between trout and long-toed salamanders, trout effectively excluded salamander populations from lakes. Somewhat surprisingly, however, salamanders managed to colonize lakes after the extinction of trout populations despite evidence of low levels of interpopulation dispersal in these salamander populations. In lakes never stocked with trout, there was no evidence of a decline in salamander populations; two of these lakes were colonized and no populations went extinct.

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ELECTRONIC FILES - Zoology