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UncertaintyHow do hydrosystem operations affect salmon survival differently by life history type and stock (e.g., Snake River fall Chinook) thereby indicating the need for different hydrosystem operations?
ThemeHydrosystem flow and passage operations
SubthemeEffects on survival - juveniles - life history diversity
Sources ISAB 2006-1: Biological Effectiveness of 2005 Summer Spill
NPCC 2009 Science Policy Exchange - Panel Discussion
Criticality Level Priority
Rationale Maintaining life history diversity promotes resilience. Thus, hydrosystem operations that adversely affect some life histories (e.g., yearling versus subyearling migrants) may threaten resiliency. This uncertainty will become even more critical when effects of climate change and a revised Columbia River Treaty are superimposed.

last updated: Jan 26, 2016