The ecological effects of fish stocking on amphibian populations in high-mountain wilderness lakes. Final Report

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The goal of this project was to determine the effects of introduced trout on faunal communities in historically fishless lakes. Using a replicated, whole-lake experiment, we documented the immediate impacts of introduced trout on zooplankton, macroinvertebrates, and amphibians. This report summarizes the resulting data from this experiment conducted by the United States Geological Survey, Biological Resources Division (USGS BRD), Idaho Department of Fish and Game (IDFG), and Idaho State University. Field work for this study was conducted during summer 1997 (July–September) in the Frank Church–River of No Return Wilderness in central Idaho. In our experimental approach, we compared changes in the distribution and abundance of zooplankton, macroinvertebrate, long-toed salamander (Ambystoma macrodactylum ), and Columbia spotted frog (Rana Juteiventris) populations before and after cutthroat (Oncorhynchus clarki) and rainbow (0. mykiss) trout were stocked in three historically fishless lakes. To better understand the impacts of trout on lentic communities, we compared the distribution and abundance of taxa in our experimentally stocked lakes to three historically stocked and five fishless lakes.

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ELECTRONIC FILE - Zoology

SWAP (2/19/2016) citation:
Hoffman RL and DS Pilliod. [1999]. The ecological effects of fish stocking on amphibian populations in high-mountain wilderness lakes. Final report. Corvallis (OR): US Geological Survey, Biological Resources Division, Forest and Rangeland Ecosystem Science Center. 85 p.