Status of chinook salmon and steelhead in the Central Valley and San Francisco Bay

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The CVTRTs Assessment of Central Valley
Spring Chinook John G Williams
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TRT Members S. T. Lindley, R. Schick, B.P.
May, J.J. Anderson, S. Greene, C. Hanson, A. Low,
D. McEwan, R.B. MacFarlane, C. Swanson, and J.G.
Williams
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February 2007
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Products
Contents
Uses
List of independent pops diversity
groups Biological viability criteria for
populations Assessment of current
status Biological viability criteria for
ESUs Assessment of current status Identification
of catastrophic risks Basic monitoring
recommen- dations
Pop Structure Pop Viability ESU
Viability Monitoring
Guide reintroductions
Biological delisting criteria
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Population structure
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Definition of Independent Population An
independent population is any collection of one
or more local breeding units whose population
dynamics or extinction risk over a 100-year time
period is not substantially altered by exchanges
of individuals with other populations.
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Population viability
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Spawning Run Size (thousands)
Year
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ESU Viability Viability by representation Viabi
lity by assessment of specific threats
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Current Climate
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2 C Warming
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5 C Warming
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Monitoring Existing monitoring programs provide
the data necessary to assess the viability of
spring Chinook. Better programs are needed to
provide data to support recovery planning and
implementation.
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Volume 4, Issue 3, Article 2 2006 CENTRAL VALLEY
SALMON A Perspective on Chinook and Steelhead in
the Central Valley of California
John G. Williams
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End of presentation