期刊
BIOSCIENCE
卷 66, 期 7, 页码 561-575出版社
OXFORD UNIV PRESS
DOI: 10.1093/biosci/biw059
关键词
biodiversity; dams; biological traits; river ecology; citizen science
类别
资金
- Bureau of Reclamation's Glen Canyon Dam Adaptive Management Program
- US Geological Survey's Southwest Biological Science Center
- Department of Energy's Western Area Power Administration
Dams impound the majority of rivers and provide important societal benefits, especially daily water releases that enable on-peak hydroelectricity generation. Such hydropeaking is common worldwide, but its downstream impacts remain unclear. We evaluated the response of aquatic insects, a cornerstone of river food webs, to hydropeaking using a life history-hydrodynamic model. Our model predicts that aquatic-insect abundance will depend on a basic life-history trait-adult egg-laying behavior-such that open-water layers will be unaffected by hydropeaking, whereas ecologically important and widespread river-edge layers, such as mayflies, will be extirpated. These predictions are supported by a more-than-2500-sample, citizen-science data set of aquatic insects from the Colorado River in the Grand Canyon and by a survey of insect diversity and hydropeaking intensity across dammed rivers of the Western United States. Our study reveals a hydropeaking-related life history bottleneck that precludes viable populations of many aquatic insects from inhabiting regulated rivers.
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