A large reservoir as a source of zooplankton for the river: structure of the populations and influence of fish predation

被引:61
作者
Akopian, M [1 ]
Garnier, J [1 ]
Pourriot, R [1 ]
机构
[1] Univ Paris 06, UMR CNRS Sisyphe 7619, F-75252 Paris 05, France
关键词
D O I
10.1093/plankt/21.2.285
中图分类号
Q17 [水生生物学];
学科分类号
071004 ;
摘要
Within an extensive programme on the Seine river, including the large reservoirs in the upstream basin, zooplankton populations were investigated at the reservoir-river interface to find out their fate when released into the river. Zooplankton structure, abundance and biomass were analysed in the river upstream and downstream from the reservoir, in the release canal and in the reservoir. Whereas the river zooplankton are dominated by rotifers, microcrustaceans represent a large part of the population in the reservoir, because of the longer residence time (6 months). We have shown that the reservoir is a source of zooplankton; we calculated a biomass export of 30-60 tons C year(-1), which is, however, rapidly lost in the river. One of the main loss factors was found to be selective fish predation on larger zooplankton species developed in the reservoir.
引用
收藏
页码:285 / 297
页数:13
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