Genetic differentiation of chinook salmon (Oncorhynchus tshawytscha) runs at Trinity River Hatchery, California

Author

Garwin M. Yip

Graduation Date

1994

Document Type

Thesis

Program

Other

Program

Thesis (M.S.)--Humboldt State University, 1994

Committee Chair Name

Thomas Hassler

Committee Chair Affiliation

HSU Faculty or Staff

Keywords

Trinity River, Humboldt State University -- Theses -- Fisheries, California, Chinook salmon--genetics

Abstract

Starch gel electrophoresis was conducted to determine the genetic differentiation of chinook salmon Oncorhynchus tshawytscha runs from Trinity River Hatchery (TRH), California. A total of 389 fish were collected from September through December 1992 at TRH. Fifty-three presumptive genetic loci from 22 enzyme systems were screened for genetic differences. For the statistical analyses, these populations were divided into a priori run timing designations by TRH, where samples 1-4 constituted the spring run, and samples 5-11 constituted the fall run. Log likelihood statistics were used to analyze the five polymorphic loci. There were significant allele frequency differences between the two TRH designated runs. Cluster analysis using unweighted pair group method with arithmetic averages (UPGMA) compared TRH runs to geographical groupings from California, Oregon, and Idaho using genetic identity values. The resulting dendrogram showed that TRH spring- and fall-runs were genetically related and were derived from the same ancestral stock.

https://scholarworks.calstate.edu/concern/theses/mc87ps62c

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