Diel vertical migration of dominant planktonic crustaceans in the south branch of Yangtze Estuary, China
Diel vertical migration of dominant planktonic crustaceans in the south branch of Yangtze Estuary, China
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DOI：
10.1016/j.aaf.2020.05.008
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发表时间：
2020-08
影响因子：
--
通讯作者：
Tianli Li;Tong Liu;Ruhan Liu;Lijing Chen
中科院分区：
文献类型：
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作者：
Tianli Li;Tong Liu;Ruhan Liu;Lijing Chen
浮游动物是鱼类重要的食物生物，其时空分布格局对当地生境鱼类的生长繁殖有重要影响。中国长江口渔业资源丰富，但对该地区浮游动物分布格局的了解还很有限。于2017年6月至2018年5月在长江口南支调查了甲壳动物群落的动态垂直迁移(DVM)格局和季节变化及其与环境因子的关系。结果表明，长江口甲壳动物优势类群的分布格局多为聚集分布。甲壳类在春季和夏季的迁徙幅度大于秋季和冬季，不同季节有不同的迁徙方式。与福贝西不同的是，法特里斯表现出明显的DVM。甲壳动物的DVM模式可能受水体中牙质光、温度和总溶解固体以及鱼类捕食效应的影响，而营养物质浓度和pH不是关键因素。
Zooplanktons are important food organisms of fishes, and their spatial and temporal distribution pattern has an important influence on the growth and reproduction of fishes in local habitats. The Yangtze River Estuary of China is rich in fishery resources, but the knowledge on the distribution pattern of zooplankton in this area is still very limited. The diel vertical migration (DVM) patterns and seasonal variations of the crustacean community, and their relationship with environmental factors were investigated in the south branch of the Yangtze Estuary, from June 2017 to May 2018. The results showed that the dispersion patterns of dominant crustacean taxa in the Yangtze Estuary were mostly aggregated. Migration amplitudes of crustacean were greater in spring and summer than in autumn and winter, and different migratory patterns occurred in different seasons.Sinocalanus dorrii,Schmackeria inopinus,Mesmackeria leuckarti,Bosmina longirostris, andB. fatalis, unlikeS.forbesi, showed a significant DVM. The DVM patterns of crustaceans was possibly influenced by light dentisy, temperature, and total dissolved solids in the water column, and the fish predation effect; whereas, the nutrient concentration and pH were not supposed to be key factors.