Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2020WR029169 |
Unintended consequences of selective water withdrawals from reservoirs alter downstream macroinvertebrate communities | |
Christina A. Murphy; Sherri L. Johnson; William Gerth; Todd Pierce; Gregory Taylor | |
2021-06-07 | |
发表期刊 | Water Resources Research
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出版年 | 2021 |
英文摘要 | Regulated rivers downstream of dams often exhibit highly modified thermal regimes in addition to modified hydrologic regimes; downstream river temperatures can be seasonally much warmer or cooler than unregulated streams. Selective water withdrawals can be used to minimize thermal impacts to downstream reaches. However, other water quality parameters, in-reservoir production, and species composition also vary with depth. In the South Fork McKenzie River, in the Pacific Northwest of North America, an existing large dam was retrofitted to mix and export water from multiple depths, allowing dam operators to adjust the outflow temperatures to be in sync with the upstream thermal regime. We examined benthic macroinvertebrate responses after implementation of selective water withdrawal, comparing it to thermally similar flow-through conditions, expecting to see shifts in the community over time to resemble upstream, undammed reaches. However, species composition and traits downstream of the dam became more dissimilar to upstream and to flow-through after selective water withdrawal. These changes included increases in non-insect taxa and taxa known to feed on plankton and detritus. The most likely explanation for this transition is that selective water withdrawal from multiple depths of a stratified reservoir included epilimnetic releases, which resulted in increased export of plankton and organic material downstream. This strategy favored taxa able to capitalize on resource subsidies from the reservoir. Our findings highlight the interconnected nature of responses to dams and dam operations, including the importance of considering biotic communities in addition to temperature and flow when planning water management strategies. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/329785 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Christina A. Murphy,Sherri L. Johnson,William Gerth,et al. Unintended consequences of selective water withdrawals from reservoirs alter downstream macroinvertebrate communities[J]. Water Resources Research,2021. |
APA | Christina A. Murphy,Sherri L. Johnson,William Gerth,Todd Pierce,&Gregory Taylor.(2021).Unintended consequences of selective water withdrawals from reservoirs alter downstream macroinvertebrate communities.Water Resources Research. |
MLA | Christina A. Murphy,et al."Unintended consequences of selective water withdrawals from reservoirs alter downstream macroinvertebrate communities".Water Resources Research (2021). |
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