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Gradients in fish feeding guilds along a reservoir cascade

机译：沿水库级联的鱼类饲养行会的梯度

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摘要

The river continuum concept predicts a longitudinal gradient in the structure and functioning of rivers. Impoundments potentially change this continuum by reorganizing nutrient transport and storage in the system. To determine if predictions made by the river continuum concept relative to fish assemblage trophic structure hold for a temperate river transformed into a reservoir cascade, we examined longitudinal trends in the distribution of biomass among feeding guilds over 30 reservoirs of the Tennessee River (USA). Fish assemblages were sampled over a 12-year period, and fishes were classified as detritivores, herbivores, invertivores, piscivores, or planktivores. Biomass of all feeding guilds increased with catchment area (i.e., in a downstream direction). However, representation of herbivores and planktivores within the fish assemblage, as indexed by percent biomass composition, increased with catchment area, whereas representation of detritivores, invertivores, and piscivores decreased. In general, the predictions made by the river continuum concept apply to the Tennessee River reservoir cascade despite the major environmental transformation caused by the series of impoundments. However, transformation of lotic into lentic systems promotes autochthonous primary production and proliferation of herbivores and planktivores that reduces relative representation of other guilds.
机译：河流连续体概念预测河流结构和功能的纵向梯度。蓄水池可能会通过重新安排系统中的养分运输和储存来改变这种连续性。为了确定河流连续统概念相对于鱼类组合营养结构所作的预测是否适用于转化为水库梯级的温带河，我们研究了田纳西河（美国）的30个水库的饲料行业生物量分布的纵向趋势。在12年的时间内对鱼群进行了采样，并将鱼分类为碎屑动物，食草动物，无食动物，食肉动物或浮游动物。所有饲养行会的生物量随流域面积的增加而增加（即在下游方向）。但是，以生物量组成百分比表示的鱼群中食草动物和浮游动物的代表随着流域面积的增加而增加，而碎屑动物，无脊椎动物和食肉动物的代表则减少。通常，尽管一系列蓄水造成了重大的环境变化，但河流连续体概念所作的预测仍适用于田纳西河水库梯级。但是，将乐透转化为小透镜系统会促进食草动物和浮游动物的自生初级繁殖和繁殖，从而减少了其他行会的相对数量。

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