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Epipelagic mesozooplankton communities in the northeastern Indian Ocean off Myanmar during the winter monsoon

Acta Oceanologica Sinica 2023年第6期42卷 57-69页

作者： Ping Du Dingyong Zeng Feilong Lin Sanda Naing Zhibing Jiang Jingjing Zhang Di Tian Qinghe Liu Yuanli Zhu Soe Moe Lwin Wenqi Ye Chenggang Liu Lu Shou Feng Zhou Key Laboratory of Marine Ecosystem Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China State Key Laboratory of Satellite Ocean Environment Dynamics Second Institute of OceanographyMinistry of Natural ResourcesHangzhou 310012China Port and Harbour Engineering Department Myanmar Maritime UniversityYangon 11293Myanmar Geology Department Dagon UniversityYangon 11422Myanmar

The northern Andaman Sea off Myanmar is one of the relatively high productive regions in the Indian *** abundance,biomass and species composition of mesozooplankton and their relationships with environmental variables in the epipelagic zone(~200 m)were studied for the first time during the Sino-Myanmar joint cruise(February 2020).The mean abundance and biomass of mesozooplankton were(1916.7±1192.9)ind./m3and(17.8±7.9)mg/m3,respectively.A total of 213 species(taxa)were identified from all *** omnivorous Cyclopoida Oncaea venusta and Oithona *** the top two dominant *** mesozooplankton communities were determined via cluster analysis:the open ocean in the Andaman Sea and the Bay of Bengal(Group A),the transition zone across the Preparis Channel(Group B),and nearshore water off the Ayeyarwady Delta and along the Tanintharyi Coast(Group C).Variation partitioning analysis revealed that the interaction of physical and biological factors explained 98.8%of mesozooplankton community spatial variation,and redundancy analysis revealed that column mean chlorophyll a concentration(CMCHLA)was the most important explanatory variable(43.1%).The abundance and biomass were significantly higher in Group C,the same as CMCHLA and column mean temperature(CMT)and in contrast to salinity,and CMT was the dominant *** taxon spatial variations were controlled by CMCHLA,salinity and *** study suggested that mesozooplankton spatial variation was mainly regulated by physical processes through their effects on *** physical processes were simultaneously affected by heat loss differences,freshwater influx,eddies and depth.

关键词： mesozooplankton Myanmar epipelagic zone physical processes water column mean chlorophyll a

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