The response of Daphnia to changes in trophic status and weather patterns : a case study from Lake Constance
Relationships between changes in trophic status and weather patterns and biomass of Daphnia in Lake Constance were analysed by comparing three long term records conducted at approximately 30-year intervals. These describe the zooplankton of Lake Constance in its oligotrophic (1920-1924), mesotrophic...
| Published in: | ICES Journal of Marine Science |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
1998
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| Subjects: | |
| Online Access: | http://nbn-resolving.de/urn:nbn:de:bsz:352-opus-39939 https://doi.org/10.1006/jmsc.1998.0397 |
| Summary: | Relationships between changes in trophic status and weather patterns and biomass of Daphnia in Lake Constance were analysed by comparing three long term records conducted at approximately 30-year intervals. These describe the zooplankton of Lake Constance in its oligotrophic (1920-1924), mesotrophic (1952-1962), and finally meso/eutrophic (1979-1995) state. Biomass increased approximately 30-fold from the 1920s to the 1950/60s and 6-fold from the 1950/60s to the I980/90s. The former increase was evident throughout the season, the latter was restricted to the second half of the year. Daphnid biomass has not yet shown any response to the re-oligotrophication process of Lake Constance during the 1980/90s. Within the period 1979-1995, biomass in May was significantly correlated with the North Atlantic Oscillation, whereas the annual average showed no response. The magnitude of inter-annual variation in spring biomass due to climate variability was as large as the long-term response to eutrophication. Because of the key role of daphnids in freshwater ecosystems, even a temporally restricted response to climate forcing might have important consequences for the ecosystem. published published |
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