Abstract
The genetic variation at 27 allozyme loci and seven different seedling traits were studied in a coastal stand of Douglas-fir [ Pseudotsuga menziesii var. menziesii (Mirb.) Franco] with respect to different elevation classes. The average proportion of polymorphic loci per elevation class was 0.54 ± 0.06 and the average proportion of heterozygous loci per individual was 0.17 ± 0.02. The isozyme data showed that the amount of genetic polymorphism varied considerably between loci and the amount and pattern of genetic variation for most loci were similar among the different elevational classes although some loci had large differences among elevational classes. Seven % of the total genic diversity was attributed to interelevational differentiation while the remaining 93% resided within the different elevational classes. Good agreement occurred between the isozyme data and quantitative information obtained from half-sib families of the same trees used for the isozyme analysis. The analyses of variance for the studied traits gave the same general trend and variation within the different elevational classes varied between 94 to 100%. In general, both the quantitative and the isozyme studies showed that the majority of variation resided within and not among the different elevation classes. Using these two different approaches in assessing variation in natural population is recommended.
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