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An annual investigation of Mollusca was carried out in Lake Taihu between November 2006 and October 2007. Altogether 12 species were recorded, belonging to 12 genera of 9 families in 232 samples. The occurrence frequency of benthic Mollusca was 90.0% in 30 sampling sites. The annual average density and biomass of Mollusca in its distribution area were 266ind./m2, 102.2g/m2, respectively. Corbicula fluminea and Bellamya aeruginosa were the dominant species of Mollusca in Lake Taihu. The occurrence frequency of C. fluminea was 90.0%, and the annual average density and biomass were 174ind./m2, 58.3g/m2, respectively, which mainly distributed in the southwest part of Lake Taihu(393-896ind./m2) and Gonghu Bay (393-552ind./m2); the occurrence frequency of B. aeruginosa was 56.7%, and the annual average density and biomass were 58ind./m2, 61.6g/m2, respectively, which mainly distributed in the east part of Lake Taihu. Principal Components Analysis showed that habitat types and characteristics of sediment were the key factors determined the spatial distribution pattern of C. fluminea, while that of the gastropods was mainly influenced by the distribution of macrophytes, which coincided with the "mutualistic theory". Analyzing the variation of Mollusca community structure between 1987 and 2006, the results showed that the mainly distributed area of C. fluminea has changed from Meiliang Bay and Zhushan Bay to the central and southwest part of Lake Taihu, and the size of C. fluminea showed a tendency of decrease (P0.001), while the average weight of B. aeruginosa did not changed remarkably (P=0.051).

Standing crop and spatial distributional pattern of Mollusca in Lake Taihu, 2006-2007