Diel vertical migration of Microcystis and crustacean zooplankton in Lake Chaohu
DENG Dao-gui1,2, XIE Ping1, ZHOU Qiong1, YANG Hua1
1. Donghu Experimental Station of Lake Ecosystems;State Key Laboratory for Freshwater Ecology and Biotechnology;Institute of Hydrobiology, The Chinese Academy of Science, Wuhan 430072; 2. Department of Biology, Huaibei Coal Industry Teachers' College, Anhui, Huaibei 235000
Diel vertical migration of Microcystis and crustacean zooplankton were investigated in October 2002.The results showed: Diel vertical migration of Microcystis(predominant Microcystis aeruginosa) was obvious.The daily density of Microcystis in the upper layer was higher than in the lower layer,the reversed pattern was observed at night.Chlorophyll-a(chl-a) had a similar pattern.Positive correlations(p<0.01) of Microcystis were observed with chl-a,water temperature,DO and pH.Diel vertical migration of several dominantly crustacean zooplanktons was surveyed.For Diaphanosoma brachyurum and Ceriodaphnia cornuta,higher density occurred daily in the lower water layer(1.5 m and 2.5 m),while they migrated to the upper layer(0 m and 0.5 m) at night.On the contrary,higher density of Chydorus ovalis appeared daily at 0 m and 0.5 m.The density of Bosmina at 11:00 and 15:00 at different water layers was higher than at night.Sinocalanus dorrii and Mesocyclops leuckarti were daily inclined to concentrate on the lower layers while they migrated to the upper layers.The density of Schmackeria sp.in different water layers at night and at 03:00 was greatly higher than other sampling times.Diel vertical migration of Limnoithona sinensis was not obvious.The negative correlation(p<0.01) between Microcystis and the density of D.brachyurum was observed,while it was positive with Bosmina and C.ovalis.
邓道贵1,2, 谢平1*, 周琼1, 杨华1. 巢湖微囊藻和浮游甲壳动物昼夜垂直迁移的初步研究[J]. , 2006, 25(1): 8-12.
DENG Dao-gui1,2, XIE Ping1, ZHOU Qiong1, YANG Hua1. Diel vertical migration of Microcystis and crustacean zooplankton in Lake Chaohu. , 2006, 25(1): 8-12.
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