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首页> 外文期刊>Ecology letters >Herbivorous animals can mitigate unfavourable ratios of energy and material supplies by enhancing nutrient recycling
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Herbivorous animals can mitigate unfavourable ratios of energy and material supplies by enhancing nutrient recycling

机译：食草动物可以通过增强营养物质的循环利用来缓解能源和物质供应的不利比例

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摘要

Recent evidence show that high supply ratios of light and nutrients limit planktonic herbivore growth by lowering the nutritional quality of algae. Over longer time scales, however, grazers may ameliorate this effect by their impact on nutrient cycling. We examine this possibility using two species of the herbivorous zooplankter Daphnia and its algal prey under different light intensities and low phosphorus supply in laboratory microcosms. At high light, Daphnia biomass was limited for a substantial period because of low P content of algal cells. However, a gradual increase in Daphnia density eventually improved food quality through grazing and nutrient cycling and via a novel process involving positive density dependence. Competitive exclusion of one of the two Daphnia species occurred under low light but not under high light when algae were nutritionally unsuitable. Such stoichiometrically mediated interactions among herbivorous animals may represent important mechanisms that affect community structure and material flows in ecosystems.
机译：最近的证据表明，光和养分的高供应比通过降低藻类的营养质量来限制浮游草食动物的生长。但是，在更长的时间范围内，放牧者可能会对养分循环产生影响，从而改善这种影响。我们在实验室缩影中使用两种草食性浮游动物水蚤及其藻类猎物在不同的光强度和低磷供应下检查了这种可能性。在强光下，由于藻类细胞的磷含量低，水蚤的生物质受到很大的限制。然而，水蚤密度的逐渐增加最终通过放牧和养分循环以及涉及正密度依赖性的新过程改善了食品质量。当藻类在营养上不合适时，两个水蚤物种之一的竞争性排斥发生在弱光下，而不是强光下。食草动物之间这种化学计量介导的相互作用可能代表了影响生态系统中群落结构和物质流动的重要机制。

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