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

Journal Article · · Journal of the American Water Resources Association
ORCiD logo [1]; ORCiD logo [2];  [3];  [1]; ORCiD logo [2]
  1. National Oceanic and Atmospheric Administration (NOAA), Seattle, WA (United States). Northwest Fisheries Science Center
  2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  3. Snoqualmie Tribe, Snoqualmie, WA (United States). Environmental and Natural Resources Department

Climate change is reducing summertime water availability and elevating water temperature, placing human consumptive needs in competition with needs of coldwater fishes. Here we worked with natural resource managers in the Snoqualmie River (Washington, USA) to develop riparian management scenarios, and used a process-based modeling system to examine how a threatened population of Chinook salmon (Oncorhynchus tschawytcha) may respond to climate change and whether riparian restoration could reduce climate effects. Linking models of global climate, regional hydrology and water temperature, and fish, we projected that streams would become warmer year-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 was depressed 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 whether riparian buffers were partially or fully restored, whereas riparian degradation further warmed streams. Riparian restoration fully mitigated climate change effects on potential yearling migrant size, but only minimally affected sub-yearling migrants (assessment metrics changed <2%). Our results will be useful for watershed managers in aligning priorities for fish and humans and our framework can be applied elsewhere.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE; US Bureau of Indian Affairs
Grant/Contract Number:
AC05-76RL01830; A18AP00192
OSTI ID:
1907070
Report Number(s):
PNNL-SA-161108
Journal Information:
Journal of the American Water Resources Association, Vol. 58, Issue 4; ISSN 1093-474X
Publisher:
Wiley - American Water Resources AssociationCopyright Statement
Country of Publication:
United States
Language:
English

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