The Three Gorges Reservoir was filled at 1 june., 2003. The water level of the reservoir rose up to 135m. The lotic river ecosystem evolved into relative lentic reservoir ecosystem before the dam. The community composition of aquatic life changed with the environmental variation. We sampled the cladocerans at. 5 sites from Maoping to Guizhou every month during June, 2003 to July, 2004. There only 2 species were sampled before impoundment at the 5 sites in the reservoir. This result showed the lotic ecosystem didn't still for inhabit for cladocerans. There 20 species were sampled after impoundment at the 5 sites in the reservoir during the first year. The reservoir ecosystem supplied habitat for the water flea. The cladoceran composition changed with season and distribution after impoundment in the reservoir. The species except Bosmina coregoni and B. fatalis varied with season and showed different in composition. The species enriched at the first month (June, 2003) after impoundment and in the spring (April, 2004). Six species (D. brachyurum, Daphnia cucullata, Bosmina coregoni, B. fatalis, Bosminopsis dettersi and Alona guttata) distributed in five sampling sites. The others species distributed in part sampling sites.
Xue Jun-Zeng; Ye Lin; Cai Qing-Hua (email@example.com) ; Liu Jian-Kang.Variation of cladocerans from Maoping to Guizhou in the Three Gorges Reservoir before and after impoundment,Acta Hydrobiologica Sinica,2006,30(1):58-63