Abstract
Adaptive differentiation in cold hardiness of Larixlaricina (DuRoi) K. Koch from 66 populations, primarily from northern Ontario, was studied using laboratory freezing tests. Population differentiation was greatest before the first frost. However, relative hardiness of populations before and after the first frost were strongly correlated. Hardiness was related to latitude, longitude, and elevation of population origins. Multiple regression analyses accounted for 74% of the variance among population means. Population differentiation was detected across relatively small geographic and elevational intervals. Consequently, in order to limit maladaptation, transfer of plant material in artificial reforestation should be carefully controlled.
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