Title: Genetic diversity, genetic structure, and mating system of brewer spruce (Pinaceae), a relict of the acto-tertiary forest
Author: Ledig, F. Thomas; Hodgskiss, Paul D.; Johnson, David R.
Source: American Journal of Botany 92(12):1975-1986
Description: Brewer spruce (Picea breweriana), a relict of the widespread Arcto-Tertiary forests, is now restricted to a highly fragmented range in the Klamath Region of California and Oregon. Expected heterozygosity for 26 isozyme loci, averaged over 10 populations, was 0.121. More notable than the relatively high level of diversity when compared to other woody endemics was the strong decrease in expected heterozygosity with latitude. Differentiation (FST) was 0.152, higher than values for many north temperate conifers with larger distributions. The number of migrants per generation (Nm) was 1.34 or 2.70, depending on the method of estimation. Inbreeding appeared low; FIS was only 0.003, in agreement with multilocus population outcrossing rates (tm), which were generally well above 0.90. No difference in tm was found between isolated vs. clustered trees.
Keywords: Fragmentation, genetic structure, heterozygosity, isozymes, relict species, selfing
View or Print this Publication (157 KB bytes)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
Ledig, F. Thomas; Hodgskiss, Paul D.; Johnson, David R. 2005. Genetic diversity, genetic structure, and mating system of brewer spruce (Pinaceae), a relict of the acto-tertiary forest. American Journal of Botany 92(12):1975-1986
Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility