共 31 条
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
来源:
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
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