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| Variation Characteristics of Pelagic Crustaceans Community in Main Rivers of Yuyao City from 2018 to 2019 |
| YANG Jieqing1, LIN Xirong2, OUYANG Longling1, CHEN Yuange1, TANG Fenghua1, MAO Shujie3, WANG Yunlong1, SHI Yunrong1 |
1. Key Laboratory of East China Sea Fisheries Resources Development and Utilization, Ministry of Agriculture and Rural Affairs, East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Shanghai 200090, China;
2. Shanghai Environment Monitoring Center, Shanghai 200235, China;
3. Fishery Management Station of Yuyao, Ningbo 315400, China |
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Abstract In order to further explore the variation characteristics of pelagic crustaceans community in main rivers of Yuyao city, the variations in species composition, dominant species, density and biomass were analyzed, based on the pelagic crustaceans survey data in February (winter), May (spring), August (summer) and November (autumn) of 2018 and 2019. Dominance curve analysis method was used to analyze the species numbers and its cumulative percentage of total pelagic crustaceans abundance. Analysis of similarity method(ANOSIM)was used to analyze the annual, seasonal and spatial differences in pelagic crustaceans community structure. Results showed that a total of 67 species, belonging to 39 genera, including 35 species of copepod and 32 species of cladocera, were identified in 2018. A total of 46 species, belonging to 26 genera, including 25 species of copepod and 21 species of cladocera, were identified in 2019. In 2018, the species composition, copepod numbers and cladocera numbers were higher than 2019. In 2018 and 2019, the density and biomass of spring ranked the first, autumn ranked the second, summer ranked the third, and winter ranked the last. The replacement rate of dominant species was about 78.26%. There was very significat difference in annual variation of pelagic crustaceans community at the level of 0.01. In 2018 and 2019, there was no significant difference in the annual variation of pelagic crustaceans community in summer at the level of 0.05, and the same in spatial. In 2019, the pelagic crustaceans community was featured by single species, and the environment of water quality tended to be eutrophication compared with 2018.
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Received: 02 February 2021
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