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首页> 外文期刊>Ecology of Freshwater Fish >Effects of fish species richness and assemblage composition on stream ecosystem function
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Effects of fish species richness and assemblage composition on stream ecosystem function

机译：鱼类物种丰富度和组合组成对河流生态系统功能的影响

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Biodiversity is declining across aquatic ecosystems because of biological invasions and species extinctions. Because fishes have pervasive effects on ecosystems through species-specific food web interactions, alterations to species and functional richness, and composition of natural assemblages could have negative effects on aquatic ecosystem function. In this study, I tested the effects of fish species and functional richness, and assemblage composition on primary production (PPR), benthic invertebrate density, and benthic particulate organic matter (BPOM) in a 42-day experiment in artificial stream mesocosms. I found that fish species richness and assemblage composition were important predictors of PPR in stream mesocosms. However, the effect of species richness on PPR increased with time, suggesting that richness-related effects might strengthen as the magnitude of community-level interactions increases in ecosystems. There was no effect of fish species or functional richness or assemblage composition on benthic invertebrate densities or BPOM. These data provide additional support that fishes can be important regulators of ecosystem function in aquatic systems, and suggest that positive effects of fishes on ecosystems can be strengthened by increased species richness and composition of the assemblage. This study broadens the applicability of the biodiversity ecosystem-function literature to a new suite of taxa, supporting the overall hypothesis that ecosystem functions and services are likely to decline in response to species extinctions.
机译：由于生物入侵和物种灭绝，整个水生生态系统的生物多样性正在下降。由于鱼类通过特定物种的食物网相互作用对生态系统产生普遍影响，因此物种和功能丰富性的改变以及自然组合的组成可能会对水生生态系统功能产生负面影响。在这项研究中，我在为期42天的人工流中型试验中测试了鱼类和功能丰富度以及组合物组成对初级生产（PPR），底栖无脊椎动物密度和底栖颗粒有机物（BPOM）的影响。我发现鱼类物种的丰富性和组合组成是溪流中质膜中PPR的重要预测因子。但是，物种丰富度对PPR的影响随时间增加，这表明与丰富度相关的影响可能会随着生态系统中社区层面互动程度的增加而增强。鱼的种类，功能丰富度或组合组成对底栖无脊椎动物密度或BPOM没有影响。这些数据提供了额外的支持，即鱼类可能是水生系统中生态系统功能的重要调节者，并表明，鱼类物种对生态系统的积极影响可以通过增加物种的丰富度和组合的组成而得到加强。这项研究将生物多样性生态系统功能文献的适用范围扩展到了一套新的分类单元，从而支持了生态系统功能和服务可能因物种灭绝而下降的总体假设。

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