Monitoring the Reproductive Success of Naturally Spawning Hatchery and Natural Spring Chinook Salmon in the Wenatchee River, 2008-2009 Progress Report.
We investigated differences in the statistical power to assign parentage between an artificially propagated and wild salmon population. The propagated fish were derived from the wild population, and are used to supplement its abundance. Levels of genetic variation were similar between the propagated and wild groups at 11 microsatellite loci, and exclusion probabilities were >0.999999 for both groups. The ability to unambiguously identify a pair of parents for each sampled progeny was much lower than expected, however. Simulations demonstrated that the proportion of cases the most likely pair of parents were the true parents was lower for propagated parents than for wild parents. There was a clear relationship between parentage assignment ability and the degree of linkage disequilibrium, the estimated effective number of breeders that produced the parents, and the size of the largest family within the potential parents. If a stringent threshold for parentage assignment was used, estimates of relative fitness were biased downward for the propagated fish. The bias appeared to be largely eliminated by either fractionally assigning progeny among parents in proportion to their likelihood of parentage, or by assigning progeny to the most likely set of parents without using a statistical threshold. We used a DNA-basedmore »
- Publication Date:
- OSTI Identifier:
- Report Number(s):
R&D Project: 2003-039-00; TRN: US200916%%259
- DOE Contract Number:
- Resource Type:
- Technical Report
- Research Org:
- Bonneville Power Administration (BPA), Portland, OR (United States)
- Sponsoring Org:
- Country of Publication:
- United States
- 13 HYDRO ENERGY; ABUNDANCE; FEMALES; GENETICS; HABITAT; JUVENILES; MALES; MONITORING; ORIGIN; PROGENY; PROGRESS REPORT; RIVERS; SALMON; STREAMS; WATER
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