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    Seedling populations were grown and compared in common environments. Statistical analyses detected genetic differences between populations for numerous traits reflecting growth potential and periodicity of shoot elongation. Multiple regression models described an adaptive landscape in which populations from low elevations have a high growth potential while those from high elevations have a low growth potential. Patterns of genetic variation reflect adaptation to a growing season of variable length. Adaptive landscapes are used to construct guidelines for limiting seed transfer in artificial reforestation. In general, seed from a single source should not be transferred more than ± 200 m in elevation.

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    Rehfeldt, G. E. 1986. Adaptive variation in Pinus ponderosa from Intermountain regions. II. Middle Columbia River system. Res. Pap. INT-RP-373. Ogden, UT: U.S. Department of Agriculture, Forest Service, Intermountain Research Station. 9 p.


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    microevolution, genetic differentiation, seed zones, seed transfer

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