Abstract
A plantation comprising 79 lodgepole pine provenance samples from all four geographic races was established in 1972 at a site on southern Vancouver Island, British Columbia. Provenance adaptability was assessed in 1991 after 20 growing seasons based on: total height, diameter, survival, crown condition, crown density, tree form, western gall rust and sequoia pitch moth damage, and principal component (PC) scores derived from PC analysis. Regression models depicting geographic trends in adaptive variation accounted for 33% (pitch moth) to 81% (PC1) of provenance variance. The results showed a strikingly narrow ecological adaptation of lodgepole pine within its coastal range. Only provenances from a narrow strip along eastern Vancouver Island in the rain shadow zone, with a climate similar to the test environment, showed no symptoms of declining vigor. Implications in the context of evolutionary significance, genetic resource management, and seed movement are discussed.
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