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首页> 外文期刊>Estuarine Coastal and Shelf Science >Seasonal and longitudinal variability of zooplankton assemblages along a river-dominated estuarine gradient
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Seasonal and longitudinal variability of zooplankton assemblages along a river-dominated estuarine gradient

机译：沿河主导的雌曲程梯度季节和纵向变异

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摘要

The Columbia River Estuary (CRE) on the Pacific coast of North America is a highly modified river-dominated estuary. Land use, human development and tributary input vary along the length of the estuary, which may impact the distribution of zooplankton; however the longitudinal and temporal variability of zooplankton have not been evaluated along the tidally-influenced length of the CRE, which extends 234 river kilometers (rkm) inland. To evaluate zooplankton dynamics along the estuarine gradient, zooplankton and environmental data were collected monthly from five sites distributed along 193 rkm (82% of the length) of the estuary over a 2-year period (2016-2018). We found that zooplankton abundance and assemblage structure exhibited strong seasonal dynamics and that abundance was higher in the year with lower river discharge. At the only saline site sampled near the river mouth, assemblages were comprised of greater proportions of estuarine and marine taxa relative to tidal freshwater sites. Zooplankton assemblages at the river mouth were best explained by salinity, discharge and temperature, while assemblages at tidal freshwater sites were best explained by temperature and season. Nonnative taxa, notably the calanoid copepod Pseudodiaptomus forbesi, comprised over 50% of zooplankton abundance at tidal freshwater sites during late summer - early autumn, but were largely absent at the river mouth. Assemblages were highly similar among tidal freshwater sites despite differences in tributary input, land use and development along the estuarine gradient. Our findings suggest that low residence times in river-dominated estuaries, such as the CRE, may contribute to homogenization of zooplankton assemblages, particularly during the high flow period and within the tidal freshwater reach.
机译：北美太平洋海岸的哥伦比亚河口（CRE）是一个高度修改的河流主导的河口。土地利用，人类发展和支流输入沿着河口的长度变化，这可能影响浮游动物的分布;然而，Zooplankton的纵向和时间可变性尚未沿着CRE的整个受影响的长度进行评估，其延伸234河千克（RKM）内陆。为了评估沿着河口梯度的Zooplankton动力学，每月从分布于193吨（82％的长度）的五个地点，从193年（2016-2018）分发的五个地点收集了Zooplankton和环境数据。我们发现Zooplankton丰富和组合结构表现出强烈的季节性动态，并且在河流下的河流下的年度较高。在河口附近的唯一盐渍网站上，组装组成的雌卤素和海洋分类群相对于潮汐淡水位点。河口的浮游动物组合是最好的盐度，放电和温度解释，而潮气淡水部位的组装最好是通过温度和季节解释。非初期的分类基因群，特别是Calanoid CopepodPseudodiaptomus forbesi，在夏季深秋天的潮汐淡水场地占Zooplankton丰富的50％以上，但在河口很大程度上缺席。尽管支流投入，土地利用和沿着河口梯度的开发差异，但在潮汐淡水场所中的组装非常相似。我们的研究结果表明，河主导的河道（如CRE）中的低停留时间可能有助于浮游动物组合的均匀化，特别是在高流量期间和潮汐淡水覆盖范围内。

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