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Watershed characteristics influence winter stream temperature in a forested landscape

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Abstract

Winter stream temperatures, though infrequently studied, exert important influences on aquatic communities. To quantify effects of watershed physical characteristics on stream winter thermal regime, 54 streams (watershed area = 0.2–7.9 km2; altitude < 1300 m) on the Olympic Peninsula, Washington, USA were monitored hourly for 4 years. During the study, an exceptionally warm winter (2015) was used to evaluate influences of watershed characteristics under climatic conditions similar to those projected for mid-twenty-first century. Four watershed characteristics were hypothesized to influence winter stream temperature: stream size, elevation, solar exposure, and presence of glacial materials overlying bedrock. Larger streams were associated with colder winter water temperatures and higher thermal sensitivity to atmospheric conditions. Elevation—the strongest driver of winter stream temperatures—was negatively correlated to stream temperature, except on the coldest 15 days of winter when it had no influence. Watershed solar exposure had only a marginal influence on how cold streams were in winter but was positively correlated to diel stream temperature variation and thermal sensitivity. Streams in watersheds with glacial material overlying the sedimentary bedrock were colder and had less diel variation and lower thermal sensitivity than streams in watersheds where glacial material was not present. During the warm 2015 winter, the influences of watershed characteristics on temperature tended to be weaker compared with the other years. These insights improve our understanding of how watershed physical characteristics influence stream winter thermal regimes and how these winter thermal regimes vary across landscapes, facilitating development of predictive models, a first step in designing management plans that account for winter thermal habitat needs.

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Availability of data and material

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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The R code used for the analysis of data in this study are available from the corresponding author upon reasonable request.

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Acknowledgements

Funding was provided by Washington State Department of Natural Resources, with additional support from the U.S. Department of Agriculture Forest Service Pacific Northwest Research Station. The authors would like to thank scientific technicians Paul Dunnette, Ellis Cropper, Mitchell Vorwerk, David Grover, and Miles Mayer. We appreciate the comments and suggestions of two anonymous reviewers.

Funding

Funding was provided by Washington State Department of Natural Resources, with additional support from the U.S. Department of Agriculture Forest Service Pacific Northwest Research Station.

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Contributions

All five authors contributed to the conception and design of the research that resulted in this manuscript. Data collection was accomplished by a team led by TM, with assistance from AF and WD and technicians named in Acknowledgements. Analytical design was led by EAS, with contributions from all other authors. Data analyses were performed by WD. The first draft of the manuscript was written by WD. All authors provided text contributing to the manuscript and commented on and edited each revision of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Warren D. Devine.

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The authors have no conflicts of interest to declare that are relevant to the content of this article.

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None; this study did not involve human participants or biological material. No experimental work was conducted on animals.

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None; this study did not involve human participants or biological material.

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None; this study did not involve human participants or biological material.

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Devine, W.D., Steel, E.A., Foster, A.D. et al. Watershed characteristics influence winter stream temperature in a forested landscape. Aquat Sci 83, 45 (2021). https://doi.org/10.1007/s00027-021-00802-x

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  • DOI: https://doi.org/10.1007/s00027-021-00802-x

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