File:McElhany et al 2000 viable salmon populations and recovery.pdf

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McElhany, P., M.H. Ruckelshaus, M.J. Ford, T.C., Wainwright, and E.P. Bjorkstedt. 2000. Viable salmonid populations and the recovery of evolutionarily significant units. U.S. Dept. Commerce, NOAA Tech. Memo. NMFS-NWFSC-42,156 p.

Four parameters form the key to evaluating population viability status. They are abundance, population growth rate, population spatial structure, and diversity. The NMFS focuses on these parameters for three reasons. First, they are reasonable predictors of extinction risk (viability). Second, they reflect general processes that are important to all populations of all species. Third, the parameters are measurable. To facilitate evaluation of populations, we provide a collection of viability guidelines based on our interpretation of currently available data and literature. As with all scientific endeavors, these guidelines can be modified as new data, more rigorous analysis and clearer interpretations are generated.