Amphibian population declines are occurring in some protected areas, such as the parks of the Sierra Nevada, California. Causes of these declines are not known, but one of the hypotheses implicates UV radiation as a stressor. Currently we are monitoring UV radiation at fourteen PRIMENet parks in an effort to detect trends in this stress through time. We want to make use of this baseline data to extrapolate UV exposure in amphibian habitat along an elevation gradient in three western parks. This will be done in concert with amphibian population surveys over a two-year period. The methods developed during this project can then be used in other parks and protected areas in an effort to link dose/response to explain amphibian population declines, especially if the Department of the Interior amphibian initiative is funded in FY 2000.
This is an interagency research project with investigators from the
EPA, NPS, USGS-BRD, and universities. This project is designed to perform
amphibian metapopulation analysis on selected pond-breeding amphibian
species in three parks along an elevational gradient. Selected pond
clusters (patches) will be surveyed in summer 1999-2000 for presence/absence
of the target species. At these sites UV will be characterized by measuring
UV extinction, concentrations of dissolved organic carbon (DOC), and
by habitat mapping.
Paul Steven Corn and Erin Muths. "Variable
breeding phenology affects the exposure of amphibian embryos to ultraviolet
radiation." in Ecology, 83(11), 2002, pp. 29582963.
Michael J. Adams,
Daniel E. Schindler, and R. Bruce Bury. "Association
of amphibians with attenuation of ultraviolet-b radiation in montane
ponds." in Oecologia 128, 2001, pp. 519525.
Ultraviolet Radiation/Amphibian Populations
for this project.
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