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Historical Records Reveal Changes to the Migration Timing and Abundance of Winter Steelhead in Olympic Peninsula Rivers, Washington State, USA
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2022
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Source: North American Journal of Fisheries Management, 42(1), 3-23
[PDF-1.03 MB]
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Journal Title:North American Journal of Fisheries Management
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Description:We analyzed multiple historical data sources (circa 1948 –1960) to estimate migration timing and abundance of Olympic Peninsula winter steelhead Oncorhynchus mykiss in the Quillayute, Hoh, Queets, and Quinault rivers, Washington, to provide context for contemporary (circa 1980 –2017) population trends. Contemporary wild winter steelhead migrations peak 1 –2 months later than historical migrations, and migration timing breadth has contracted by up to 26 d (a 37% reduction of the interquartile range of the migration timing distribution). Migration timingchanges coincide with an era of peak industrial forestry and introductions of early migrating hatchery winter steelhead stocks. We estimate that contemporary mean wild winter steelhead abundance has declined by 55% across populations
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Source:North American Journal of Fisheries Management, 42(1), 3-23
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ISSN:0275-5947;1548-8675;
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Rights Information:CC BY-NC-ND
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Compliance:Library
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