Present situation investigation on zooplankton in Yueqing Bay

Based on the survey in May and September,the zooplankton species composition,quantity distribution,diversity,community structure and relationship between abundance and environmental factors in Yueqing Bay were studied.The results showed that there were 47 species zooplankton in 13 groups in May and 70 species in 16 groups in September.The zooplankton in the survey area were mainly composed of coastal low saline species,and also a few of brackish water species.The main species of May were Calanus sinicu、leurobrachia globosa、Sagitta bedoti Beraneck,and the main species of September were Centropages dorsispinatus,Sagitta nagae,Calanopia thompsoni,Euphausiacea larvae and Macruran Larvae.The abundances of zooplankton in May were 91 ind /m3,and 115 ind /m3 in September.The qualities of zooplankton in May were 0.209 g/m3,and 0.222 g/m3 in September.The Margalef richness index,Pielou evenness index,Shannon-Weiner diversity index and Simpson dominance index in September were more than those in May.