Mechanistic Simulations Suggest Riparian Restoration Can Partly Counteract Climate Impacts to Juvenile Salmon

Aimee H. Fullerton; Ning Sun; Matthew J. BaerwaldeBrooke L. HawkinsHongxiang Yan

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Mechanistic Simulations Suggest Riparian Restoration Can Partly Counteract Climate Impacts to Juvenile Salmon

机译：Mechanistic Simulations Suggest Riparian Restoration Can Partly Counteract Climate Impacts to Juvenile Salmon

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Climate change is reducing summertime water availability and elevating water temperature, placinghuman consumptive needs in competition with needs of coldwater fishes. We worked with natural resource managersin the Snoqualmie River (Washington, USA) to develop riparian management scenarios, and used a processbasedmodeling system to examine how a threatened population of Chinook salmon (Oncorhynchus tschawytscha)may respond to climate change and whether riparian restoration could reduce climate effects. Linking models ofglobal climate, regional hydrology, water temperature, and fish, we projected that streams would become warmeryear-round and drier during summer, further stressing salmon. Climate change accelerated egg emergence,increased juvenile growth and survival, and accelerated outmigration of sub-yearling migrants. Growth wasdepressed for salmon remaining instream during summer (potential yearling migrants). Riparian restoration counteracted～10% of summer increases in water temperature, and affected salmon similarly regardless of whetherriparian buffers were partially or fully restored, whereas riparian degradation further warmed streams. Riparianrestoration fully mitigated climate change effects on potential yearling migrant size, but only minimally affectedsub-yearling migrants (assessment metrics changed <2%). Our results will be useful for watershed managers inaligning priorities for fish and humans and our framework can be applied elsewhere.

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来源
《Journal of the American Water Resources Association》 |2022年第4期|525-546|共22页
作者
Aimee H. Fullerton; Ning Sun; Matthew J. BaerwaldeBrooke L. HawkinsHongxiang Yan;
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作者单位

Fish Ecology Division, Northwest Fisheries Science Center, National Marine Fisheries Service, National Oceanicand Atmospheric Administration Seattle, Washington, USA;

Pacific Northwest National Laboratory, Richland, Washington, USA;

and Snoqualmie Indian Tribe, Environmental and Natural Resources Department Snoqualmie, Washington, USA;

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正文语种英语
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关键词
water temperature; flow; Pacific salmon; climate change; riparian management; mechanistic model;

Mechanistic Simulations Suggest Riparian Restoration Can Partly Counteract Climate Impacts to Juvenile Salmon

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