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Media type:
E-Article
Title:
Analysis of Three Amphibian Populations with Quarter-Century Long Time-Series
Contributor:
Meyer, Andrea H.;
Schmidt, Benedikt R.;
Grossenbacher, Kurt
Published:
The Royal Society, 1998
Published in:
Proceedings: Biological Sciences, 265 (1998) 1395, Seite 523-528
Language:
English
ISSN:
0962-8452
Origination:
Footnote:
Description:
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.