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首页> 外文期刊>Journal of plankton research >Relationship between environmental conditions and zooplankton community structure during summer hypoxia in the northern Gulf of Mexico
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Relationship between environmental conditions and zooplankton community structure during summer hypoxia in the northern Gulf of Mexico

机译：墨西哥湾北部夏季缺氧期间环境条件与浮游动物群落结构之间的关系

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摘要

The environmental conditions and mesozooplankton community were monitored during summer cruises in 2003, 2004 and 2006-2008 in the northern Gulf of Mexico. Data were collected on temperature, salinity, dissolved oxygen, chlorophyll-a and zooplankton taxonomic abundances. Environmental conditions were largely related to the influence of the Mississippi River plume. The zooplankton community was numerically dominated by copepods, with various meroplankton and other non-copepod zooplankton present in lower abundances. Cluster analysis revealed four distinct groups of co-occurring zooplankton taxa. Two of these were numerically dominant, one characterized by the copepod Acartia spp. and a second consisting of several copepod taxa (including larger-bodied genera) and salps. Relative to the group containing Acartia spp., this second dominant group was more abundant at higher salinity, lower temperature and greater vertical extent of hypoxic water into the water column above the seafloor. Dissolved oxygen, as vertical extent of hypoxia, was of comparable importance to temperature and salinity in predicting the abundances of zooplankton taxa. Variability of the zooplankton community with environmental conditions, and particularly the greater abundance of larger taxa in association with hypoxia, has implications for the contribution of zooplankton-mediated vertical flux to oxygen drawdown, and for the quality of the food environment for larval and other planktivorous fish.
机译：在2003年，2004年和2006-2008年在墨西哥湾北部的夏季巡游期间，对环境条件和中游浮游生物群落进行了监测。收集有关温度，盐度，溶解氧，叶绿素-a和浮游动物分类学丰度的数据。环境条件很大程度上与密西西比河羽流的影响有关。浮游动物群落在数量上以co足类动物为主，各种浮游动物和其他非足足类浮游动物的数量较低。聚类分析揭示了四个共生浮游动物类群的不同组。其中两个在数量上占优势，一个以one足类the螨属为特征。第二种是由几种co足类的类群（包括大体的属）和胡麻组成。相对于含A螨属的组，该第二显性组在较高盐度，较低温度和进入海底水柱的低氧水的垂直范围较大的情况下更为丰富。在预测浮游动物类群的丰度时，作为低氧的垂直程度的溶解氧对温度和盐度具有同等重要的意义。浮游动物群落与环境条件的变化，尤其是与低氧相关的较大分类单元的大量存在，对浮游动物介导的垂直通量对氧气的吸收的贡献以及幼虫和其他浮游动物的食物环境质量都有影响。鱼。

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