Slide2:
Columbia River at The Dalles (1970-1999) Virgin flow: observed flow corrected for reservoir manipulation and irrigation depletion and return
Adjusted flow: river flow adjusted for irrigation water withdrawal and return
Observed flow: Empirically measured flow at a gauge
Slide3:
Estuary
recoveries
Slide4:
Smolt Survival Studies 1995-1997
Fall chinook salmon: flow vs. survival
Slide5:
Columbia River Plume: June 1999 vs. June 2001
Slide6:
Ocean Transition and Riverine Plume Dynamics Physical dynamics
- temporal and spatial distribution of fronts and eddies; mixing and convergent zones
Trophic dynamics
- primary and secondary production
- predator-prey interactions
Distribution, growth, and survival of salmon A critical habitat transition
Slide7:
Conclusions Water is more than the medium in which salmon live…it is a dynamic force in shaping habitats and influencing survival throughout the complex life cycle
The flow-travel time-survival relationship for selected species of migrating juvenile salmon is an example of such an ecological service.
Significant progress is being made in understanding such ecological services in spawning and rearing and in estuarine and nearshore ocean habitats.