Northwest Fisheries Science Center

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Document Type: Report
Center: NWFSC
Document ID: 8632
Title: Assessing the impact of environmental conditions and hydropower on population productivity for interior Columbia River stream-type Chinook and steelhead populations
Author/Editor: ICTRT (Interior Columbia Technical Recovery Team), Richard W. Zabel
Year: 2007
Institution: Draft report of the National Marine Fisheries Service

In this report, we describe and present the results from a life–cycle modeling framework designed to evaluate population productivity and abundance under alternate scenarios of hydropower operation and environmental conditions.  This approach translates life–stage–specific changes in survival into metrics of population viability, which can be used for managing population recovery.  Further, the approach takes into account the potential effects of density dependence when incorporating changes in survival.  Finally, the approach allows for the analysis of alternative future scenarios, particularly ones related to climate, in the prediction of future population trajectories.  The stochastic nature of the model naturally produces uncertainty in projected viability metrics.

Theme: Recovery and rebuilding of marine and coastal species
Foci: Characterize the population biology of species, and develop and improve methods for predicting the status of populations.