the ecology and distribution of steelhead in the eel river · •do summer and winter-run fish...
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![Page 1: The Ecology and Distribution of Steelhead in the Eel River · •Do summer and winter-run fish spawn and rear in different ... Dip-netting proved to be the most effective method to](https://reader035.vdocuments.mx/reader035/viewer/2022080718/5f78c3cff8761a2a1369a5ed/html5/thumbnails/1.jpg)
The Ecology and Distribution of Steelhead in
the Eel River
Samantha Kannry
Master’s Student
Ecology Graduate Group
University of California, Davis
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The Van Duzen River has a small remnant run of summer steelhead.
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In California there are two distinct runs of
steelhead, winter and summer.
Summer steelhead in the Middle Fork Eel
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The Eel River is currently the southernmost extent of summer steelhead in California.
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The Eel River is extremely erosive and characterized by many large, complex stretches of “roughs”.
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Historic Counts of summer steelhead in the Van Duzen averaged an order of magnitude lower than what we have observed.
0
50
100
150
200
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300
1975 1980 1985 1990 1995 2000 2005 2010 2015 2020
Van Duzen River Summer Steelhead Counts
Year
Nu
mb
er o
f In
div
idu
als
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Many questions have remained unanswered regarding current and historic distribution of steelhead in the Eel River.
• Are Van Duzen summer steelhead an independent population?
• Is Eaton Falls a complete barrier to anadromy?
• Do summer and winter-run fish spawn and rear in different locations?
• Would the resident trout population above Scott Dam be a good restoration source if the dam were to be removed?
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Dip-netting proved to be the most effective method to obtain sufficient samples.
• High spatial distribution
• Young of the year sampling
• 2 years of sampling
Basin Number of SitesTotal number of samples
Van Duzen 29 480
Middle Fork 13 183
Upper Eel 8 173
Total = 836
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Genetic analyses provide useful tools for addressing ecological questions.
• Laboratory preparation
• Rapture
• Overall differentiation, OMY5 and GREB1L
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Many questions have remained unanswered regarding current and historic distribution of steelhead in the Eel River.
• Are Van Duzen summer steelhead an independent population?
• Is Eaton Falls a complete barrier to anadromy?
• Do summer and winter-run fish spawn and rear in different locations?
• Would the resident trout population above Scott Dam be a good restoration source if the dam were to be removed?
Summer steelhead in the Van Duzen
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Van Duzen summer steelhead are an independent population, not strays from the Middle Fork Eel.
PC1 (1.13%) / PC2 (0.945%)
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Many questions have remained unanswered regarding current and historic distribution of steelhead in the Eel River.
• Are Van Duzen summer steelhead an independent population?
• Is Eaton Falls a complete barrier to anadromy?
• Do summer and winter-run fish spawn and rear in different locations?
• Would the resident trout population above Scott Dam be a good restoration source if the dam were to be removed?
Eaton Falls
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There is a high frequency of the anadromous genotype above Eaton Falls.
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Eaton Falls is not a complete barrier to anadromy.
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Many questions have remained unanswered regarding current and historic distribution of steelhead in the Eel River.
• Are Van Duzen summer steelhead an independent population?
• Is Eaton Falls a complete barrier to anadromy?
• Do summer and winter-run fish spawn and rear in different locations?
• Would the resident trout population above Scott Dam be a good restoration source if the dam were to be removed?
Pink Caves
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We observe distinct spatial segregation around the three major Lost Duzen barriers at the GREB1L locus.
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We observe similar spatial segregation of summer and winter-run steelhead around barriers in the Middle Fork.
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Many questions have remained unanswered regarding current and historic distribution of steelhead in the Eel River.
• Are Van Duzen summer steelhead an independent population?
• Is Eaton Falls a complete barrier to anadromy?
• Do summer and winter-run fish spawn and rear in different locations?
• Would the resident trout population above Scott Dam be a good restoration source if the dam were to be removed?
Upper Eel above Scott Dam
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The summer-run allele is
present in the resident trout
population above Scott
Dam.
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Life history diversity is being
maintained in the resident
population above the dam.
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Overall genetic diversity is being maintained in the resident population above the dam.
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Conclusions• Van Duzen River summer steelhead are an
independent population
• Anadromous fish are passing Eaton Falls with some regularity
• Summer and winter-run steelhead are reproductively isolated by distinct geographic barriers
• Summer-run steelhead inhabited the Upper Eel above Scott Dam prior to dam construction
• Genetic diversity is being maintained in the resident population above the dam
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Acknowledgements• Shaun Thompson, Scott Harris
• Amazing volunteers: Lindsey Holm, Sam Rizza, Jeff Abrams, Natalie Okun, Seth Ricker, Cat Fong, Ryan Thompson, Mary Clapp, Alisha Saley, Rose Dana, Eric Stockwell, Jake Crawford, Tasha Thomson, Ethan Bertz, Cameron Holmgren
• Additional samples: Bob Pagliuco, Keith Lackey
• Landowners: Mark and Dina Moore, Humboldt Redwood Company, Eric Larsen, Griff Bramble
• Funding: Ecology Graduate Group, Department of Animal Science UC Davis, Native Fish Society, Patagonia Inc., Friends of the Eel River
• Mike Miller, Sean O’Rourke
• And many more