Multiple stressors and amphibian declines: dual impacts of pesticides and fish on yellow-legged frogs.

Multiple stressors and amphibian declines: dual impacts of pesticides and fish on yellow-legged frogs. Research Abstract Details 

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Multiple stressors and amphibian declines: dual impacts of pesticides and fish on yellow-legged frogs. Abstract Text:

Carlos Davidson,Roland A Knapp,

More than 40% of Earth's 5700+ amphibian species have undergone recent declines. Despite the likely involvement of multiple factors in driving these declines, most studies continue to focus on single stressors. In California (USA), separate studies have implicated either introduced fish or pesticides as causal agents. To date, however, no study has simultaneously evaluated the respective roles of these two potential stressors nor attempted to assess their relative importance, information critical for the development of effective conservation efforts and environmental policies. We examined the role and relative effect of fish and pesticides on the mountain yellow-legged frog (Rana muscosa) using unusually detailed data sets for a large portion of R. muscosa's historic range in California's Sierra Nevada. Habitat characteristics and presence/absence of R. muscosa and fish were quantified at each of 6831 sites during field surveys. Pesticide use upwind of each site was calculated from pesticide application records and predominant wind directions. Using generalized additive models, we found that, after accounting for habitat effects, the probability of R. muscosa presence was significantly reduced by both fish and pesticides, with the landscape-scale effect of pesticides much stronger than that of fish. The degree to which a site was sheltered from the predominant wind (and associated pesticides) was also a significant predictor of R. muscosa presence. Taken together, these results represent the strongest evidence to date that windborne pesticides are contributing to amphibian declines in pristine locations. Our results suggest that amphibian declines may have complex multi-factorial causes, and caution that single-factor studies that demonstrate the importance of one factor should not be used as evidence against the importance of other factors.

Multiple stressors and amphibian declines: dual impacts of pesticides and fish on yellow-legged frogs. Publishing Authors By Initials

C Davidson,RA Knapp,

For similar chemical actions and uses: toxic actions: environmental pollutants: water pollutants: water pollutants, chemical research abstracts see: chemical actions and uses: toxic actions: environmental pollutants: water pollutants: water pollutants, chemical research

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Multiple stressors and amphibian declines: dual impacts of pesticides and fish on yellow-legged frogs. Journal Published:

PUBLICATION TYPE: Research Support, U.S. Gov't,

Journal: Ecological applications : a publication of the Eco

VOLUME: 17

Page Numbers: 587-97

Journal Abbreviation:

ISSN: 1051-0761

DAY: 3

MONTH: Mar

YEAR: 2007

Multiple stressors and amphibian declines: dual impacts of pesticides and fish on yellow-legged frogs. Information

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LANGUAGE: eng

NlmUniqueID: 9889808

Multiple stressors and amphibian declines: dual impacts of pesticides and fish on yellow-legged frogs. Keywords Mesh Terms:

KEYWORDS: Water Pollutants, Chemical

MESH TERMS: toxicity

Chemical & Substance for Abstract: Multiple stressors and amphibian declines: dual impacts of pesticides and fish on yellow-legged frogs. Information

Substance Name: Water Pollutants, Chemical

Registry Number: 0

Grant and Affiliation Information for Multiple stressors and amphibian declines: dual impacts of pesticides and fish on yellow-legged frogs.

AFFILIATION: Environmental Studies Program, San Francisco State University, California 94132, USA. carlosd@sfsu.edu

Country: United States

AGENCY: United States NIEHS

GRANT: R01ES12067

ACRONYM: ES

MEDLINETA: Ecol Appl

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