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首页> 外文期刊>Limnology >Longitudinal changes in zooplankton distribution below a reservoir outfall with reference to river planktivory
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Longitudinal changes in zooplankton distribution below a reservoir outfall with reference to river planktivory

机译：参考河流浮游生物，水库排泄口以下浮游动物分布的纵向变化

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摘要

The fate and interactions with river organisms of zooplankton as they drift downriver from a reservoir on a fourth-order mountain stream (Hiji River, Japan) were investigated. Monthly samples were collected at the reservoir and six river sites, simultaneously, from May 2005 to May 2006. Aquatic macroinvertebrates and fish were colleted, and their stomach contents were analyzed in April and May, 2006, respectively. Drift from the reservoir was the primary source for the river plankton community; the abundance of zooplankton, particularly those of cladocerans and large rotifer, rapidly decreased within several kilometers of the dam. Analysis of the contents of fish stomachs showed that drifting zooplankton was the main food for fish, with strong food selectivity for cladocerans and large rotifers. However, fish and insect planktivores showed longitudinally different stomach contents, with progressively fewer zooplankton found in the stomachs at the downriver sites. The results suggest that the outflow of zooplankton from the reservoir is an important food source for the downstream predators, especially fish, but the drift of zooplankton and consequent food availability for the predators at lower sites are strongly limited by concentrated fish predation just below the reservoir dam.
机译：研究了浮游动物从四阶山区河流（日本姬路）上的水库向下漂流时的命运及其与河流生物的相互作用。从2005年5月至2006年5月，同时在水库和六个河流站点每月采集一次样品。收集了水生大型无脊椎动物和鱼类，并分别于2006年4月和2006年5月分析了它们的胃内容物。来自水库的漂流是河浮游生物群落的主要来源。在水坝几公里内，浮游动物的数量迅速减少，特别是枝角类和大型轮虫的数量迅速减少。对鱼胃内容物的分析表明，浮游动物是鱼类的主要食物，对枝角类和大型轮虫具有很强的食物选择性。然而，鱼类和昆虫浮游动物显示出纵向不同的胃内容物，在下游部位的胃中发现的浮游动物逐渐减少。结果表明，浮游动物从水库中的流出是下游捕食者（尤其是鱼类）的重要食物来源，但浮游动物的漂移和下游捕食者的食物供应量受到水库下方集中鱼类捕食的强烈限制。坝。

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