Graduate Thesis Or Dissertation
 

Population genetic structure of Jeffrey pine

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/0g354k536

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  • Jeffrey pine occurs in the mountains of California and adjacent states. In the Klamath Mountains, the northern margin of the range, it is restricted to infertile ultramafic soils, forming very open stands of low density. It occurs predominantly on more fertile soils in the Sierra Nevada and southern portions of the range, but does occur on ultramafic soils in the Sierra Nevada foothills. To contrast the Klamath Mountains with the Sierra Nevada - Southern region, I examined the mating system in five populations, and patterns of allozyme variation at 20 loci in 14 populations. No significant difference was found in outcrossing between Kiamath and Sierra populations, with both being predominantly outcrossing (t = .935). Genotype frequencies in these five populations fit Hardy-Weinberg expectations. Eighteen of 20 loci surveyed were polymorphic. Average expected heterozygosity was lower in the Klamath than the Sierra Nevada Southern region (.185 vs. .255). Allele frequency differences between the two regions were detected at 11 of 18 loci tested. The one Sierra population sampled on ultramafic soil was more similar to Klamath populations in allele frequencies than were other Sierra populations, possibly suggesting genetic adaptation to ultramafic soils. Jeffrey pine appears to be similar to most other conifers studied in having high outcrossing and high levels of genetic variability, with most of the variability occurring within populations.
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