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Analysis of Three Amphibian Populations with Quarter-Century Long Time-Series

Andrea H. Meyer, Benedikt R. Schmidt and Kurt Grossenbacher
Proceedings: Biological Sciences
Vol. 265, No. 1395 (Mar. 22, 1998), pp. 523-528
Published by: Royal Society
Stable URL: http://www.jstor.org/stable/50824
Page Count: 6
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Analysis of Three Amphibian Populations with Quarter-Century Long Time-Series
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Abstract

Amphibians are in decline in many parts of the world. Long time-series of amphibian populations are necessary to distinguish declines from the often strong fluctuations observed in natural populations. Time-series may also help to understand the causes of these declines. We analysed 23-28-year long time-series of the frog Rana temporaria. Only one of the three studied populations showed a negative trend which was probably caused by the introduction of fish. Two populations appeared to be density regulated. Rainfall had no obvious effect on the population fluctuations. Whereas long-term studies of amphibian populations are valuable to document population declines, most are too short to reveal those factors that govern population dynamics or cause amphibian populations to decline.

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