Long‐term environmental flows restore benthic invertebrate communities in a highly regulated river

IF 2.8 3区 环境科学与生态学 Q2 ECOLOGY Restoration Ecology Pub Date : 2024-05-13 DOI:10.1111/rec.14174
Andrew J. Brooks, Daniel W. Coleman, Robyn C. Bevitt, Timothy Haeusler, Matthew D. Russell, Teresa Rose, Simon Williams
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Abstract

The construction of dams and other in‐stream structures for human use has altered river ecosystems worldwide. Dams degrade rivers, and environmental flow releases aim to mitigate flow alterations and restore rivers downstream of dams by returning elements of the pre‐regulation flow regime, resulting in an ecosystem that resembles a more natural state. We examined the responses of benthic invertebrate communities in riffles and pool‐edge habitats to an environmental flow regime (EFR) in the highly regulated Snowy River over 17 years (2000–2016). Benthic invertebrate communities significantly changed in response to prolonged increases in the magnitude of all components of the flow regime. The composition of the benthos in the regulated river became more dissimilar to pre‐EFR communities and more closely resembled those of nearby unregulated rivers. These changes were apparent in both riffle and pool‐edge habitats and were most pronounced when flow magnitudes were highest. Scrapers increased as flows increased, and in contrast, the relative abundances of gatherers declined with prolonged high flows and could be attributed to increased daily flows and high flow events mobilizing fine sediment and scouring benthic substrates. These results indicated that the EFR altered abiotic conditions or resources that previously limited invertebrate abundances, facilitating changes to the benthic community. Community changes we observed were in response to a flow regime that remained drastically lower than natural, demonstrating that restoration targets can be achieved with small flow increases that mimic natural flow patterns.
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长期环境流恢复了一条高度管制河流中的底栖无脊椎动物群落
为人类使用而建造的水坝和其他河内结构改变了世界各地的河流生态系统。大坝使河流退化,而环境水流释放的目的是通过恢复调节前的水流状态来减轻水流的变化并恢复大坝下游的河流,从而使生态系统更接近自然状态。我们考察了高度管制的雪河在 17 年(2000-2016 年)内涟漪和池边栖息地底栖无脊椎动物群落对环境流量机制(EFR)的反应。底栖无脊椎动物群落随着水流制度所有组成部分的幅度长期增加而发生了显著变化。受调控河流中的底栖无脊椎动物群落组成与全环流之前的群落组成更加不同,而与附近未受调控河流中的群落组成更加相似。这些变化在河沟和池边生境中都很明显,而且在流量最大时最为显著。刮食者随着流量的增加而增加,与此相反,采集者的相对丰度随着长期大流量而下降,这可能是由于日流量的增加和大流量事件调动了细小沉积物并冲刷了底栖基质。这些结果表明,EFR 改变了以前限制无脊椎动物丰度的非生物条件或资源,促进了底栖生物群落的变化。我们所观察到的群落变化是对仍然大大低于自然水流的水流机制的响应,这表明,模仿自然水流模式的小流量增加可以实现恢复目标。
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来源期刊
Restoration Ecology
Restoration Ecology 环境科学-生态学
CiteScore
6.50
自引率
15.60%
发文量
226
审稿时长
12-24 weeks
期刊介绍: Restoration Ecology fosters the exchange of ideas among the many disciplines involved with ecological restoration. Addressing global concerns and communicating them to the international research community and restoration practitioners, the journal is at the forefront of a vital new direction in science, ecology, and policy. Original papers describe experimental, observational, and theoretical studies on terrestrial, marine, and freshwater systems, and are considered without taxonomic bias. Contributions span the natural sciences, including ecological and biological aspects, as well as the restoration of soil, air and water when set in an ecological context; and the social sciences, including cultural, philosophical, political, educational, economic and historical aspects. Edited by a distinguished panel, the journal continues to be a major conduit for researchers to publish their findings in the fight to not only halt ecological damage, but also to ultimately reverse it.
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