Water storage decisions will determine the distribution and persistence of imperiled river fishes

Ecological Applications
By: , and 

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Abstract

Managing the world’s freshwater supply to meet societal and environmental needs in a changing climate is one of the biggest challenges for the 21st century. Dams provide water security, however, the allocation of dwindling water supply among reservoirs could exacerbate or ameliorate the effects of climate change on aquatic communities. Here, we show that the relative sensitivity of river thermal regimes to direct impacts of climate change and societal decisions concerning water storage vary substantially throughout a river basin. In the absence of interspecific interactions, future Colorado River temperatures would appear to benefit both endemic and nonnative fish species. However, endemic species are already declining or extirpated in locations where their ranges overlap with warmwater nonnatives and changes in water storage may lead to warming in some of the coolest portions of the river basin, facilitating further nonnative expansion. Integrating environmental considerations into ongoing water storage negotiations may lead to better resource outcomes than mitigating nonnative species impacts after the fact.

Publication type Article
Publication Subtype Journal Article
Title Water storage decisions will determine the distribution and persistence of imperiled river fishes
Series title Ecological Applications
DOI 10.1002/eap.2279
Edition Online First
Year Published 2020
Language English
Publisher Ecological Society of America
Contributing office(s) Southwest Biological Science Center
Description e2279
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