Spatial Structure of Spawning- McElheny, et al. 2000 _ Evaluating population status
- 4 key parameters
- Abundance
- Population growth rate
- Population spatial structure
- Diversity
- Abundance and spatial distributions of a supplemented and a wild control population of Chinook salmon before and after the implementation of the hatchery supplementation program.
Outline- Study Area & Background
- Research questions
- Comparison: Pre and Post Supplementation
- Redd Abundance, Density and Distributions
- Wild / Natural Origin Carcass Distribution
- Conclusions
Goals- Compare redd abundance before and after supplementation.
- Evaluate spatial distributions of redds by analyzing density and distribution before and after supplementation.
- Investigate distributions of wild and “natural origin” carcasses before and after supplementation.
Outline- Study area & background
- Research questions
- Comparison: Pre and post supplementation
- Redd abundance, density and distributions
- Wild / natural origin carcass distribution
- Conclusions
Increased abundance (both populations).- Increased abundance (both populations).
- Increased densities in most reaches post supplementation.
- Shifts in distributions of spawning (natural process?) and perhaps a result of homing to hatchery facilities.
Outline- Study area & background
- Research questions
- Comparison: Pre and post supplementation
- Redd abundance, density and distributions
- Wild / natural origin carcass distribution
Proportions increased in Yakima and Teanaway Rivers- Proportions increased in Yakima and Teanaway Rivers
- Teanaway – Upstream (closer to acclimation facility)
- Yakima – Higher proportions trending upstream and around central hatchery.
- Proportions decreased in the Cle Elum River.
- Pre supplementation period – high occurrence of wild spawners below the Cle Elum dam.
- Post supplementation period – significant drop in the percentage of wild spawners in the most upstream 2 km section (less overall fish but distributions are the same).