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Optical characteristics of natural waters protect amphibians from UV-B in the U.S. Pacific Northwest

Ecology

By:
, , , , , and

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Abstract

Increased exposure to ultraviolet-B (UV-B) radiation has been proposed as a major environmental stressor leading to global amphibian declines. Prior experimental evidence from the U.S. Pacific Northwest (PNW) indicating the acute embryonic sensitivity of at least four amphibian species to UV-B has been central to the literature about amphibian decline. However, these results have not been expanded to address population-scale effects and natural landscape variation in UV-B transparency of water at amphibian breeding sites: both necessary links to assess the importance of UV-B for amphibian declines. We quantified the UV-B transparency of 136 potential amphibian breeding sites to establish the pattern of UV-B exposure across two montane regions in the PNW. Our data suggest that 85% of sites are naturally protected by dissolved organic matter in pond water, and that only a fraction of breeding sites are expected to experience UV-B intensities exceeding levels associated with elevated egg mortality. Thus, the spectral characteristics of natural waters likely mediate the physiological effects of UV-B on amphibian eggs in all but the clearest waters. These data imply that UV-B is unlikely to cause broad amphibian declines across the landscape of the American Northwest.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Optical characteristics of natural waters protect amphibians from UV-B in the U.S. Pacific Northwest
Series title:
Ecology
Volume
83
Issue:
11
Year Published:
2002
Language:
English
Contributing office(s):
Forest and Rangeland Ecosystem Science Center
Description:
p. 2951-2957
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Ecology
First page:
2951
Last page:
2957
Number of Pages:
7