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Seasonal variations of the ichthyoplankton assemblage in the Yangtze Estuary and its relationship with environmental factors

机译：长江口鱼鳞浮游动物的季节性变化及其与环境因子的关系

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摘要

Seasonal variations of the ichthyoplankton assemblage and its relationship with the environment were analyzed based on four seasonal surveys during 2012. Historical data was collected to be compared with results from previous years in order to indicate the seasonal and inter-annual variation of the ichthyoplankton assemblage in the Yangtze Estuary and the adjacent waters. A total of 3,688 individuals belonging to 5 orders, 9 families, and 15 species were collected. No samples were collected in the winter cruise. In 2012, all samples were separated into four ecotypes, which is comparable with the historical data from previous years. The Engraulis japonicus was the most abundant species of all teleost fishes. The E. japonicus was captured in every season and contributed the most to the abundance of ichthyoplankton, which was greater than that of previous years. This result may be due to the periodic fluctuations of E. japonicus or from the displacement of spawning grounds offshore for environmental reasons. The diversity indices of the assemblage were significantly different among seasons, with the number and abundance of the species peaking in the spring, while richness, evenness and diversity indices peaked in the autumn. The species richness of the ichthyoplankton varied from 0.74 to 1.62, the Pielou evenness index varied from 0.10 to 0.49 and the Shannon–Wiener index varied from 0.19 to 1.04. The results of CCA analysis showed that the major factors affecting the ichthyoplankton assemblage differed throughout the seasons. Chla was the key factor affecting the ichthyoplankton in 2012. These seasonal and inter-annual variations likely resulted from migrations associated with fish spawning as well as the environment. Compared with data from previous studies, the relationship between the assemblage structure of ichthyoplankton and corresponding environmental variables have undergone a decline.
机译：根据2012年的四次季节调查分析了鱼鳞浮游动物的季节性变化及其与环境的关系。收集历史数据与往年的结果进行比较，以表明鱼鳞浮游动物的季节性和年际变化。长江口及附近水域。总共收集了3,688个人，分别属于5个科，9个科和15个物种。冬季巡游中未收集任何样品。 2012年，所有样本均被分为四种生态类型，与前几年的历史数据具有可比性。刺tele是所有硬骨鱼类中最丰富的种类。在每个季节都捕获了日本大肠埃希菌，它对鱼鳞浮游生物的丰富度贡献最大，比往年要多。此结果可能是由于日本大肠埃希菌的周期性波动或出于环境原因离岸产卵场的位移所致。物种多样性指数在各个季节之间存在显着差异，该物种的数量和丰度在春季达到峰值，而丰富度，均匀度和多样性指数在秋季达到峰值。鱼鳞浮游生物的物种丰富度从0.74到1.62不等，Pielou均匀度指数从0.10到0.49不等，Shannon-Wiener指数从0.19到1.04不等。 CCA分析结果表明，影响鱼鳞浮游生物组合的主要因素在整个季节都不同。 Chla是影响2012年鱼类浮游生物的关键因素。这些季节性和年际变化可能是由与鱼类产卵以及环境有关的迁移引起的。与以前的研究相比，鱼鳞浮游生物的组合结构与相应的环境变量之间的关系有所下降。

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