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

查看全文 作　　者：Ping [1,2]Du;Dingyong [2]Zeng;Feilong [2]Lin;Sanda [3]Naing;Zhibing [1,2]Jiang;Jingjing [1]Zhang;Di [2]Tian;Qinghe [1]Liu;Yuanli [1]Zhu;Soe Moe [4]Lwin;Wenqi [1]Ye;Chenggang [1]Liu;Lu [1]Shou;Feng [2]Zhou 高影响力作者 机构地区：[1]Key Laboratory of Marine Ecosystem Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;[2]State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;[3]Port and Harbour Engineering Department,Myanmar Maritime University,Yangon 11293,Myanmar;[4]Geology Department,Dagon University,Yangon 11422,Myanmar高影响力机构 出　　处：《Acta Oceanologica Sinica》索引2023年第42卷第6期,共13页高影响力期刊 基　　金：The Scientific Research Fund of the Second Institute of Oceanography,Ministry of Natural Resources under contract No.JG2210;the Global Change and Air-Sea Interaction II Program under contract No.GASI-01-EIND-STwin;the National Natural Science Foundation of China under contract Nos 42176148 and 42176039。 摘　　要：The northern Andaman Sea off Myanmar is one of the relatively high productive regions in the Indian Ocean.The 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 samples.The omnivorous Cyclopoida Oncaea venusta and Oithona spp.were the top two dominant taxa.Three 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 factor.Significant taxon spatial variations were controlled by CMCHLA,salinity and temperature.This study suggested that mesozooplankton spatial variation was mainly regulated by physical processes through their effects on CMCHLA.The 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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