| Negative effects of Microcystis blooms on the crustacean plankton in an enclosure experiment in the subtropical China |
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| 作者姓名： | CHEN Fei-zhou XIE Ping TANG Hui-juan LIU Hong |
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| 作者单位： | [1]Donghu Experimental Station of Lake Ecosystems, State Key Laboratory for Freshwater Eeology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China [2]Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China |
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| 基金项目： | The Key Project of Chinese Academy of Sciences（No. KZCX1-SW-12） and Chinese Postdoctoral Fundation（No. 2003034392） |
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| 摘 要： | IntroductionCyanobacteria(i .e .Microcystis aeruginosa) blooms arefrequently associated withchanges of zooplanktoncommunity.Fewzooplanktons can use bloom-formingMicrocystisdirectlybecause of nutritional deficiencies ( Arnold, 1971 ) ,inedibility( Webster …
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| 关 键 词： | 甲壳类浮游植物 中国 水蚤 捕食生物 环境生物 |
| 文章编号： | 1001-0742（2005）05-0775-07 |
| 收稿时间： | 2004-12-06 |
| 修稿时间： | 2005-03-31 |
Negative effects of Microcystis blooms on the crustacean plankton in an enclosure experiment in the subtropical China |
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| CHEN Fei-zhou,XIE Ping,TANG Hui-juan,LIU Hong.Negative effects of Microcystis blooms on the crustacean plankton in an enclosure experiment in the subtropical China[J].Journal of Environmental Sciences,2005,17(5):775-781. |
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| Authors: | CHEN Fei-zhou XIE Ping TANG Hui-juan and LIU Hong |
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| Institution: | 1. Donghu Experimental Station of Lake Ecosystems, State Key Laboratory for Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China;Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008,China
2. Donghu Experimental Station of Lake Ecosystems, State Key Laboratory for Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China |
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| Abstract: | Effects of Microcystis blooms on the crustacean plankton were studied using enclosure experiments during July-September, 2000. Eight enclosures were set in the hypereutrophic Donghu Lake. Different nutrient concentrations through additional nutrient and sediment in enclosures were expected to result in different abundance of Microcystis. From July to early August, the phytoplankton community was dominated by Chlorophyta, Cryptophyta, Bacillariophyta and Cyanophyta other than Microcystis aeruginosa. M. aeruginosa showed a rapid increase during early August in all enclosures and predominated. Crustacean plankton was dominated by the herbivorous Moina micrura, Diaphanosoma brachyurum and Ceriodaphnia cornuta, and the predaceous Mesocyclops sp. and Thermocyclops taihokuensis. During the pre-bloom period, the dynamics of M. micrura population appeared to be mainly affected by the predaceous cyclopoids. With the development of Microcystis blooms, such interaction between M. micrura and cyclopoids seemed weakened, especially when the Microcystis biomass was high. But there was no apparent influence on the interaction between Leptodora kindti and its zooplanktonic prey. The density of two cyclopoids decreased with the enhancement of Microcystis. The density decline of M. micrura was caused by both predation and inhibition by Microcystis. The low food availability of other edible phytoplankton during the blooms led to low densities of both C. cornuta and D. brachyurum by late August. It appears that dense Microcystis blooms exert strong negative effects on the herbivorous cladocerans and the predaceous cyclopoids. |
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| Keywords: | crustacean plankton cladocerans cyclopoids food availability Microcystis bloom |
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