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A Climate-Mediated Shift in the Estuarine Habitat Mosaic Limits Prey Availability and Reduces Nursery Quality for Juvenile Salmon

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Abstract

The estuarine habitat mosaic supports the reproduction, growth, and survival of resident and migratory fish species by providing a diverse portfolio of unique habitats with varying physical and biological features. Global climate change is expected to result in increasing temperatures, rising sea levels, and changes in riverine hydrology, which will have profound effects on the extent and composition of the estuarine habitat mosaic and its associated nursery quality for juvenile fish. We used a spatially explicit bioenergetics model to assess how different climate change scenarios might affect juvenile salmon growth rate potential relative to present day conditions in the Nisqually River Delta, WA, USA. The model indicated that prey-rich habitats such as emergent salt marshes and eelgrass meadows were most likely to facilitate growth, and that reductions in their areal extent and accessibility could have severe consequences for salmon. For instance, unmitigated sea-level rise halved the predicted extent of low- and high-elevation emergent salt marsh, leading to a 30% reduction in end-of-season weights. Increasing water temperatures compounded these effects during the late spring and summer such that the average daily growth rate of an individual fish decreased by an additional 5–50% when compared to the effects of sea-level rise alone. Lethal temperatures (> 24 °C) were infrequently observed, but they were more likely to occur during summer low tides in the mudflat and eelgrass habitats when accessibility to prey-rich marsh was minimal, thereby limiting foraging capacity and the availability of thermal refugia. Our findings indicate that, barring the enactment of targeted management strategies, rising tidal levels and increasing ocean temperatures may reduce the quality of the estuarine habitat mosaic for out-migrating salmon and other sensitive fish species.

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Acknowledgements

This research was carried out as part of a collaborative effort between the U.S. Geological Survey (USGS), the Nisqually Indian Tribe, and Billy Frank Jr. Nisqually National Wildlife Refuge. USGS employees L. Shakeri, S. Blakely, A. Munguia, A. Hissem, L. Lamere, C. Freeman, A. Goodman, S.J. Donald, Y. Chan, C. Norton, and J.Y. Takekawa; Tribal employees W. Duval, E. Perez, J. Moore, and A. David; Refuge staff D. Roster, M. Bailey, J. Barham; and University of Washington biologists K. Connelly, J. Gardner, and M. Gamble were a vital part of this project’s success. Thanks to J. Keister and her lab for sharing bongo tow data from the Salish Sea Marine Survival Project. We would also like to acknowledge Z. Zhu, J. Schmerfeld, and S. Covington for their financial and logistical support. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Funding

This research was funded by the Washington State Estuary and Salmon Restoration Program (ESRP Project #13-1583P) with a grant awarded to the USGS Western Ecological Research Center (WERC). Additional science support came from the Salish Sea Marine Survival Program, WERC program funds, the USGS Ecosystems Mission Area, the USGS LandCarbon Program, the U.S. Fish and Wildlife Service Coastal Program, and several USGS internship programs (Students in Support of Native American Relations, National Association of Geoscience Teachers, and Youth and Education in Science). Graduate student author M. Davis was supported by an American Dissertation Fellowship through the American Association of University Women.

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Correspondence to Melanie J. Davis.

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Communicated by Ronald Baker

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Davis, M.J., Woo, I., Ellings, C.S. et al. A Climate-Mediated Shift in the Estuarine Habitat Mosaic Limits Prey Availability and Reduces Nursery Quality for Juvenile Salmon. Estuaries and Coasts 45, 1445–1464 (2022). https://doi.org/10.1007/s12237-021-01003-3

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  • DOI: https://doi.org/10.1007/s12237-021-01003-3

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