Biomass distribution and seasonal variation of zooplankton in the Changjiang Estuary and its adjacent waters

doi:10.3969/j.issn.1001-909X.2017.04.010

Abstract

Abstract: A comprehensive investigation involving biological, chemical and physical parameters was conducted in the Changjiang Estuary and its adjacent waters (29°30′N~32°30′N,120°00′E~127°30′E) in four seasons (from July 2006 to December 2007). The biomass of zooplankton, the key species affecting the biomass and their seasonal variation were studied based on the identification result of zooplankton samples and field measurement of environmental parameters. The results showed that there was a significant seasonal change in zooplankton biomass in the Changjiang Estuary and its adjacent waters. A significant decreasing trend was observed from spring to winter. The main contributors to zooplankton biomass included Calanussinicus, Diphyeschamissonis, Zonosagittabedoti and Pseudeuphausiasinica. The characteristics of this area were closely related to the influence of Changjiang River Plume, Taiwan Warm Current, Zhejiang Coastal Current and Kuroshio Current, thus formed an unique physical and chemical environment. Nutrient were the main environmental factor influencing the zooplankton biomass distribution in this area. Besides, other environmental factors also influenced the biomass of zooplankton, and there was seasonal difference. In spring, water temperature and salinity were the main influence factors. The zooplankton biomass had a significant positive correlation with water temperature and salinity. In summer, temperature, dissolved oxygen and chlorophyll a concentration were the main factors affecting the biomass of zooplankton. The zooplankton biomass was significantly negatively related to water temperature, and significantly positively related to dissolved oxygen and chlorophyll a concentration. In autumn, salinity, dissolved oxygen and suspended particles were the main factors affecting the biomass of zooplankton. The zooplankton biomass was significantly positively related to salinity, and significantly negatively related to dissolved oxygen and suspended particles. In winter, the water temperature in the Changjiang Estuary and its adjacent waters decreased significantly under the influence of cold front and current. Lower temperature depressed the growth and metabolism of zooplankton community. In addition, the community structure was simpler and the zooplankton biomass decreased. Therefore, no significant correlation between zooplankton biomass and environmental factors was found.

Key words: Changjiang Estuary, zooplankton, biomass, seasonal variation, environmental factor

CLC Number:

Q178.53

LI Xiao-hui, LIU Zhen-sheng. Biomass distribution and seasonal variation of zooplankton in the Changjiang Estuary and its adjacent waters[J]. Journal of Marine Sciences, 2017, 35(4): 94-101.

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