Aspen Bibliography

Observations on the Ecology and Evolution of Quaking Aspen, Populus tremuloides, in the Colorado Front Range

Document Type

Article

Journal/Book Title/Conference

American Journal of Botany

Volume

67

Issue

2

First Page

202

Last Page

209

Publication Date

2-1980

Abstract

Three protein polymorphisms and annual width increments measured from cores were used to study the ecology and evolution of quaking aspen, Populus tremuloides Michx., in the Front Range of Colorado. Correlations among elevation, age and diameter of the largest standing ramet, and sex and mean growth rate of 106 clones are reported and discussed. The variance of growth rate was apportioned within and among ramets of a clone; the majority of the variance is environmental, with broad heritability estimated as less than or equal to .32. Analyses of gene and genotypic frequencies of polymorphic proteins revealed little differentiation with elevation, but substantial differences between the sexes. For one of three pairwise tests, the genotypes are not distributed independently of one another; linkage disequilibrium between a peroxidase locus and phosphohexose isomerase is significantly different from zero. Multiple regression revealed a positive correlation between mean growth rate and degree of heterozygosity.

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