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SCI论文目录 |
Comparative studies on effects of predation by fish on Daphnia in
Lake Donghu (China) and Loch Leven (Scotland)
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| 出 版 社：Ecosystem Approaches for Fisheries Management. |
| 发表时间：1999 |
| 台 站：
东湖湖泊生态系统试验站
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作 者：Yang, Yufeng; May, Linda; Gunn, Iain; Huang, Xiangfei; Liu,
Jiankang
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| 点 击 率：2474 |
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| 关 键 字：null |
| 摘 要：null |
| 关 键 字(英文)：null |
摘 要(英文)： From the data of Daphnia surveys made in 1979-1996 in Lake Donghu
(China) and in 1978-1982 and 1992-1995 in Loch Leven (Scotland),
two shallow eutrophic lakes near Wuhan and Edinburgh,
respectively, the authors analyzed the long-term changes in
densities and size frequency of Daphnia. The results showed annual
average densities of Daphnia (station I + station II) in Lake
Donghu were negatively correlated with fish yield. Daphnia
densities tended to decrease after the introduction of rainbow
trout to Loch Leven from 1993 on. The size-frequency distributions
of Daphnia showed that small-sized Daphnia were dominant in Lake
Donghu, but the distributions in Loch Leven changed little. The
comparative studies showed that the Daphnia population was
determined largely by fish in Lake Donghu, with a high stocking
rate of planktivorous fish, and also by predatory copepods. In
Loch Leven, food resources, water temperature, etc., were key
factors causing a stable Daphnia population, the introduction of
rainbow trout having little effect on Daphnia, but analysis of gut
contents of rainbow trout demonstrated an apparent size-selective
predation for Daphnia larger than 1.4 mm in length. A low fish
stocking rate may be one of the important reasons for the stable
Daphnia population in Loch Leven.
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