Catastrophes and Recovery Goals. The Question: . What is the number and distribution of populations needed for a sustainable ESU?. Spatial Scale. Population (as per VSP) reproductive isolation independent demographics and intrinsic extinction risk ESUs may contain multiple populations.
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Spills >10,000 gallons over 14 year period.
(State of Washington Dept. of Ecology)
(Bue et al. 1997)
Nx = Number at time x
Rx = Spawners produced per Spawner at time x
R is a stochastic variable with a lognormally
distribution that can be estimated from data
Ai = Fraction that mature at age i
Snake River Fall Chinook