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Variable breeding phenology affects the exposure of amphibian embryos to ultraviolet radiation

Ecology

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Abstract

Reduced water depth in dry years has been proposed to interact with ultraviolet-B (UV-B) radiation and pathogenic fungus to cause episodes of high mortality of amphibian embryos. Observations of breeding phenology of boreal chorus frogs (Pseudacris maculata) in Colorado from 1986-2001 show that dry years result in earlier breeding. The earliest and latest dates of maximum calling activity by males were 20 May and 16 June, and the date of maximum calling was strongly related to the amount of snow accumulation during the winter. Surface UV-B flux, estimated from satellite-based measurements, was positively related to date of maximum calling. In dry years, surface UV-B during calling was reduced by an amount similar to that attributed to reduced depth. Although there was a significant trend of increasing UV-B from 1978-2001 on the average date (2 June) of maximum calling activity, there was no relationship between year and surface UV-B at actual dates of maximum calling. Exposure to extreme temperatures is an alternative explanation for increased mortality of amphibian embryos in shallow water.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Variable breeding phenology affects the exposure of amphibian embryos to ultraviolet radiation
Series title:
Ecology
Volume
83
Issue:
1
Year Published:
2002
Language:
English
Description:
p. 2958-2963
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
2958
Last page:
2963
Number of Pages:
6