Spring Chinook Salmon Interactions Indices - Competition

Spring Chinook Salmon Interactions Indices - Competition

Beverton/Holt and Ricker

Importance of Density Dependence

Capacity changes Yakima River at Cle Elum 98-06

Discharge vs. Cross Sectional Area

Food vs. Flow (2006)

Length vs. Focal Velocity 98-06

What happens to habitable area of juvenile Chinook when discharge increases dramatically relative to normal?

Normal vs. Managed Measures Yakima River at Cle Elum 98-06

Habitat area goes down (2005-2006)

% of habitable area (05-06)

Nelson Hydrograph

Increase in habitable area (05-06)

Distribution of SPC (Nelson)

If flow is influencing habitable space, then what is the magnitude of impact to juvenile spring Chinook salmon and the supplementation program?

Hypothetical Flow Mortality

Until effects of artificial flows and passage are addressed then the scope of supplementation success will be limited by the current capacity

Acknowledgments

Discharge vs. Habitable Area

Cle Elum cross-sectional area

Genetic and Environ. Capacity