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首页> 外文期刊>The Science of the Total Environment >Multiple stressor effects on biodiversity and ecosystem functioning in a Mediterranean temporary river
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Multiple stressor effects on biodiversity and ecosystem functioning in a Mediterranean temporary river

机译：多种应激因素对地中海临时河流生物多样性和生态系统功能的影响

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The hydrological and biological complexity of temporary rivers as well as their importance in providing goods and services is increasingly recognized, as much as it is the vulnerability of the biotic communities in view of climate change and increased anthropogenic pressures. However, the effects of flow intermittency (resulting from both seasonal variations and rising hydrological pressure) and pollution on biodiversity and ecosystem functioning have been overlooked in these ecosystems. We explore the way multiple stressors affect biodiversity and ecosystem functioning, as well as the biodiversity-ecosystem functioning (B-EF) relationship in a Mediterranean temporary river. We measured diversity of benthic communities (i.e. diatoms and macroinvertebrates) and related ecosystem processes (i.e. resource use efficiency-RUE and organic matter breakdown-OMB) across a pollution and flow intermittency gradient. Our results showed decreases in macroinvertebrate diversity and the opposite trend in diatom assemblages, whereas ecosystem functioning was negatively affected by both pollution and flow intermittency. The explored B-EF relationships showed contrasting results: RUE decreased with higher diatom diversity, whereas OMB increased with increased macroinvertebrate diversity. The different responses suggest contrasting operating mechanisms, selection effects possibly driving the B-EF relationship in diatoms and complementarity effects driving the B-EF relationship in macroinvertebrates. The understanding of multiple stressor effects on diversity and ecosystem functioning, as well as the B-EF relationship in temporary rivers could provide insights on the risks affecting ecosystem functioning under global change. (C) 2018 The Authors. Published by Elsevier B.V.
机译：临时河流的水文和生物复杂性及其在提供商品和服务中的重要性日益得到认可，鉴于气候变化和人为压力增加，这也是生物群落的脆弱性。然而，在这些生态系统中，水流间歇性（由季节变化和水文压力上升所引起）和污染对生物多样性和生态系统功能的影响被忽略了。我们探索了多种压力因素如何影响地中海临时河流中生物多样性和生态系统功能以及生物多样性与生态系统功能（B-EF）的关系。我们测量了污染和流量间歇梯度下底栖生物群落（即硅藻和大型无脊椎动物）和相关生态系统过程（即资源利用效率-RUE和有机物分解-OMB）的多样性。我们的结果表明，大型无脊椎动物多样性的下降和硅藻集合体的相反趋势，而生态系统功能受到污染和流动间歇性的负面影响。探索的B-EF关系显示出相反的结果：RUE随着硅藻多样性的增加而降低，而OMB随着大型无脊椎动物多样性的增加而增加。不同的响应表明不同的操作机制，可能驱动硅藻中B-EF关系的选择效应和驱动大型无脊椎动物中B-EF关系的互补效应。了解多重压力因素对多样性和生态系统功能的影响，以及临时河流中的B-EF关系，可以提供关于全球变化下影响生态系统功能的风险的见解。 （C）2018作者。由Elsevier B.V.发布

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