Abstract：The zooplankton community structure (species composition, number of dominant species, diversity index) and the relationship with water masses in the coastal waters of Zhoushan were studied based on the plankton surveys in spring (April) and autumn (November) voyages off Zhoushan in 2019. The stations in the study area were classified by SPSS cluster analysis, and the differences in species number, Shannon-Wiener′s diversity index, speices richness index, and speices evenness index were analysed in the spring and autumn. Canonical correspondence analysis (CCA) was used to analyze the differences in the composition of zooplankton groups in the spring and autumn of 2019, and the reasons for the replacement of dominant species. The mechanism of the seasonal dynamics was finally discussed in the zooplankton community structure in spring and autumn. The results showed that according to the cluster analysis of surface sea temperature and surface sea salinity, the area was divided into 3 water masses:the water mass in the Hangzhou Bay(Area Ⅰ), the upwelling water mass in the Zhoushan Island(Area Ⅱ) and the offshore water mass in the Zhoushan(Area Ⅲ ). The independent sample T test method was used to test the significant effects of three water masses on the composition of zooplankton groups (P<0.05). The average dissimilarity of the zooplankton community composition was Ⅰ, Ⅱ, and Ⅲ, 71.04% in area Ⅰ water masses, 75.71% in area Ⅱ water masses, and 91.70% in area Ⅲ water masses in spring and autumn, The abundance of zooplankton was found to be greater in spring than that in autumn (P<0.05), and the diversity of zooplankton to be greater in autumn than that in spring (P<0.05). CCA showed that salinity was the main environmental factor affecting the spatial distribution, and temperature and chlorophyll a were the main environmental factors affecting the seasonal dynamics. The low temperature and high level of chlorophyll a in spring were favorable for a large number of zooplankton, and the high temperature and low level of chlorophyll a in autumn were suitable for a small number of zooplankton to live widely.
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2022, Vol. 41 
