Complex causes of amphibian population declines

被引:528
作者
Kiesecker, JM [1 ]
Blaustein, AR
Belden, LK
机构
[1] Penn State Univ, Dept Biol, Mueller Lab 208, University Pk, PA 16802 USA
[2] Oregon State Univ, Dept Zool, Corvallis, OR 97331 USA
关键词
D O I
10.1038/35070552
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Amphibian populations have suffered widespread declines and extinctions in recent decades. Although climatic changes, increased exposure to ultraviolet-B (UV-B) radiation and increased prevalence of disease have all been implicated at particular localities(1-6), the importance of global environmental change remains unclear. Here we report that pathogen outbreaks in amphibian populations in the western USA are linked to climate-induced changes in UV-B exposure. Using long-term observational data and a field experiment, we examine patterns among interannual variability in precipitation, UV-B exposure and infection by a pathogenic oomycete, Saprolegnia ferax. Our findings indicate that climate-induced reductions in water depth at oviposition sites have caused high mortality of embryos by increasing their exposure to UV-B radiation and, consequently, their vulnerability to infection(1). Precipitation, and thus water depth/UV-B exposure, is strongly linked to El Nino/Southern Oscillation cycles, underscoring the role of large-scale climatic patterns involving the tropical Pacific(7). Elevated sea-surface temperatures in this region since the mid-1970s, which have affected the climate over much of the world(8), could be the precursor for pathogen-mediated amphibian declines in many regions(1,3,4,9).
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页码:681 / 684
页数:5
相关论文
共 31 条
[31]   Increased UV-B penetration in a lake owing to drought-induced acidification [J].
Yan, ND ;
Keller, W ;
Scully, NM ;
Lean, DRS ;
Dillon, PJ .
NATURE, 1996, 381 (6578) :141-143