The RIPPLE Population Module follows the multi-stage stock-production approach to population modeling. In this approach, a carrying capacity and density-independent mortality for each life stage, estimated from field data or literature, are used to develop life-stage-specific stock-production relationships. The model identifies critical life-stages, and compares relative changes in population size between alternative management scenarios (e.g., various instream flows, fish passage, hatchery management, potential enhancements). The model also serves as a framework for integrating available data and can either be used predicatively or as a means of identifying critical data gaps.
The following reference is recommended for additional information on the RIPPLE Population Module:
Stillwater Sciences. 2006. Population dynamics of bull trout and spring Chinook salmon at the Carmen-Smith Hydroelectric Project, Upper McKenzie River Basin, Oregon. Final report. Prepared by Stillwater Sciences, Arcata, California for Eugene Water & Electric Board, Eugene, Oregon.
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