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. 1995 Nov 21;92(24):11049-52.
doi: 10.1073/pnas.92.24.11049.

Synergism between UV-B radiation and a pathogen magnifies amphibian embryo mortality in nature

J M Kiesecker  1 , A R Blaustein
Affiliations

Synergism between UV-B radiation and a pathogen magnifies amphibian embryo mortality in nature

J M Kiesecker et al. Proc Natl Acad Sci U S A. .

Abstract

Previous research has shown that amphibians have differential sensitivity to ultraviolet-B (UV-B) radiation. In some species, ambient levels of UV-B radiation cause embryonic mortality in nature. The detrimental effects of UV-B alone or with other agents may ultimately affect amphibians at the population level. Here, we experimentally demonstrate a synergistic effect between UV-B radiation and a pathogenic fungus in the field that increases the mortality of amphibian embryos compared with either factor alone. Studies investigating single factors for causes of amphibian egg mortality or population declines may not reveal the complex factors involved in declines.

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