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首页> 外文期刊>Hydrobiologia >Influence of Pulsed Inflows and Nutrient Loading on Zooplankton and Phytoplankton Community Structure and Biomass in Microcosm Experiments Using Estuarine Assemblages
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Influence of Pulsed Inflows and Nutrient Loading on Zooplankton and Phytoplankton Community Structure and Biomass in Microcosm Experiments Using Estuarine Assemblages

机译：河口组合微观实验中脉冲流和养分含量对浮游动物和浮游植物群落结构及生物量的影响

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Productivity and community structure of phytoplankton and zooplankton are influenced by hydrologic disturbances in many ways. In a recent modeling study it was suggested that pulsed inflows might enhance zooplankton performance, curb accumulation of phytoplankton accumulated biomass, and promote phytoplankton species diversity. We tested these predictions by performing microcosm experiments on natural plankton assemblages from the Nueces Delta, TX, USA. On three occasions (March, June, and September 2001), experiments of semi-continuous and flow-through design were conducted using natural plankton assemblages. We investigated the effect of two different inflow and nutrient loading regimes on zooplankton biomass, and phytoplankton biomass and diversity, i.e., continuous and pulsed inflows of 3 day frequency. Despite differences in initial community structure on these three occasions, as well as the very different communities that arose between experimental designs, our findings showed that pulsed inflows altered plankton dynamics. In all cases, pulsed inflows resulted in greater zooplankton biomass. In most cases, pulsed inflows resulted in lower phytoplankton biomass and higher diversity. We speculate that greater phytoplankton diversity in the pulsed flow treatments favored selectively feeding zooplankton, whose better performance prevented higher accumulation of phytoplankton biomass.
机译：浮游植物和浮游动物的生产力和群落结构在许多方面受到水文扰动的影响。在最近的模型研究中，有人提出脉冲流可以增强浮游动物的性能，遏制浮游植物积累的生物量的积累，并促进浮游植物的物种多样性。我们通过对来自美国德克萨斯州Nueces Delta的天然浮游生物集合体进行缩影实验，测试了这些预测。在三种情况下（2001年3月，6月和2001年9月），使用天然浮游生物组合进行了半连续和流通设计的实验。我们调查了两种不同的流入量和养分加载方式对浮游生物量，浮游生物量和多样性的影响，即连续和脉冲频率为3天的流入量。尽管这三种情况下的初始群落结构存在差异，并且实验设计之间出现了非常不同的群落，但我们的研究结果表明，脉冲状流入改变了浮游生物的动力学。在所有情况下，脉冲流入都会导致浮游动物的生物量增加。在大多数情况下，脉冲状流入导致浮游植物生物量较低和多样性较高。我们推测脉冲流处理中较大的浮游植物多样性有利于选择性喂养浮游动物，其更好的性能阻止了浮游植物生物量的更高积累。

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