Graduate Thesis Or Dissertation
 

A phenotypic comparison of thirty-eight steelhead (Oncorhynchus mykiss) populations from coastal Oregon

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  • An aspect of the genetic structure of coastal Oregon steelhead was explored and found to gradually change in a north to south pattern for the allelic frequencies of several enzymes. Isocitrate dehydrogenase and superoxide dehydrogenase were the clearest examples of this pattern of variation. This pattern was most evident in populations from river basins larger than 350 km². The area south of the Coos River was marked by a transition in the increase of at least four rare alleles, most notably variants of phosphoglucose isomerase 2 and malate dehydrogenase 3-4. Populations from the largest (2000 km²) basins had on average 10% more variants of the ME 3 common enzyme than did populations from the smallest (200 km²) basins. The genetic distance between the Nehalem hatchery stock and neighboring wild stocks appears to have narrowed since the reintroduction of wild fish to the hatchery. In the decade since the last major electrophoretic work on coastal steelhead, most populations seemed little changed; however shifts in several isozyme frequencies were noted in populations from two Rogue River tributaries and the Elk River. The Bandon Hatchery stock persisted in showing large departures from coastwide trends for many alleles.
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file details HatchKeithM1990.pdf 2017-08-10 Pubblico Scaricare