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首页> 外文期刊>Estuaries and coasts >Plankton Assemblage Variability in a River-Dominated Temperate Estuary During Late Spring (High-flow) and Late Summer (Low-flow) Periods
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Plankton Assemblage Variability in a River-Dominated Temperate Estuary During Late Spring (High-flow) and Late Summer (Low-flow) Periods

机译：春季（高流量）和夏季（低流量）后期河支配温带河口中的浮游生物集合变异性

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摘要

Seasonally variable freshwater flows are known to influence estuarine plankton assemblages. There has been little recent study of the plankton dynamics of the Columbia River Estuary (CRE), a large, river-dominated estuary that has experienced great modification to its hydrological cycle. Zooplankton (>75 mu m) were collected during four late spring (high-flow) cruises and three late summer (low-flow) cruises in 2005 and 2006. Surface-water microplankton (5-200 mu m) were collected during cruises in 2005. Zooplankton and phytoplankton assemblage composition varied along an axial salinity gradient and between flow periods. Estuarine zooplankton were strongly seasonal and dominated by the calanoid copepod Eurytemora affinis in the late spring, high-flow period and by the invasive calanoid Pseudodiaptomus forbesi in the late summer, low-flow period. The phytoplankton assemblage was dominated by freshwater diatoms, primarily Aulacoseira spp. The ciliate Mesodinium rubrum (=Myrionecta rubra) reached high densities during the low-flow period, but otherwise, distinct high-flow and low-flow phytoplankton assemblages were not detected. Comparison to prior studies in the CRE suggests that the plankton assemblage composition during the low-flow period has undergone considerable change, which may in turn have important trophic implications.
机译：已知季节性变化的淡水流量会影响河口浮游生物的聚集。最近，对哥伦比亚河河口（CRE）的浮游生物动力学的研究很少，哥伦比亚河河口是一个以河为主导的大型河口，其水文循环发生了很大的变化。在2005年和2006年的四次春季（高流量）航行和三次夏季（低流量）航行中收集了浮游动物（> 75微米）。在2007年的航行中收集了地表水微浮游生物（5-20​​0微米）。 2005。浮游动物和浮游植物的组成组成沿轴向盐度梯度和流动周期之间变化。河口浮游动物是强烈季节性的，在春季后期，高流量时期以an足类pe足类Eurytemora affinis为主，而在夏季后期，低流量时期则以侵入性的类鼻anPseudodiaptomus forbesi为主。浮游植物的组合以淡水硅藻为主，主要是Aulacoseira spp。纤毛中生红藻（= Myrionecta rubra）在低流量时期达到高密度，但除此之外，未检测到明显的高流量和低流量浮游植物组合。与CRE先前研究的比较表明，低流量时期的浮游生物组合物成分发生了相当大的变化，这反过来可能具有重要的营养意义。

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