Study on the variation and distribution of zooplankton community in the Zhanjiang Bay in summer and autumn

Based on the data obtained from the two cruises carried out in August and November of 2010,the species composition,quantitative distribution and seasonal variation of zooplankton in the Zhanjiang Bay were analyzed.Results showed that 51 species in summer and autumn were identified.Acartia spinicauda and Balanua larva were two dominant groups appearing in two seasons.The number of dominant species in summer was a little more than that in autumn.The abundance of zooplankton was higher in summer(7 807.3 ind/m3) than that in autumn(190.15 ind/m3).The abundance of zooplankton inside the bay was higher than that outside the bay in summer.The copepods and larvae were the dominant groups in summer and autumn.The average diversity indices of zooplankton in summer was 1.91,and the average evenness was 0.50.The average diversity indices of zooplankton in autumn was 2.28,and the average evenness was 0.77.The average diversity indices and evenness of zooplankton in summer were less than those in autumn.