• Corpus ID: 211238537

Population Structure and History of Steelhead Trout in California

@inproceedings{Garza2006PopulationSA,
  title={Population Structure and History of Steelhead Trout in California},
  author={John Carlos Garza and Libby Gilbert-Horvath and Joe M. Anderson and Thomas D. Williams and Brian C. Spence and Heidi E. Fish},
  year={2006}
}
Steelhead trout (Oncorhynchus mykiss) are the most widespread of the anadromous salmonids. In the western continental United States, 14 Evolutionarily Significant Units (ESUs) have been delineated on the basis of genetic, geographic and ecological variation. Of these 14 western ESUs, 11 have been listed as protected under the US Endangered Species Act (ESA). In California, there are six ESUs, 5 on the coast and 1 in the Central Valley. All but the Klamath Mountain Province ESU is listed, with… 

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References

SHOWING 1-3 OF 3 REFERENCES
PHYLOGENETIC ANALYSIS: MODELS AND ESTIMATION PROCEDURES
TLDR
This paper shows how suitable evolutionary models can be constructed and applied objectively and how the type of data will affect both the method of treatment and the validity of the results.
Detection of reduction in population size using data from microsatellite loci
TLDR
It is demonstrated that the mean ratio of the number of alleles to the range in allele size, which is calculated from a population sample of microsatellite loci, can be used to detect reductions in population size and that the value of M consistently predicts the reported demographic history for these populations.
AN EXACT TEST FOR POPULATION DIFFERENTIATION