0.100820064544681139047RMRSINTESPublished to Web1Publication1Formally Refereed1Scientific Journal (JRNL)<![CDATA[Ecological adaptations in Douglas-fir (Pseudotsuga menziesii var. glauca) populations: I. North Idaho and North-East Washington]]> 1979-1Growth, phenology and frost tolerance of seedlings from 50 populations of Douglas-fir (Pseudotsuga menziesii var. glauca) were compared in 12 environments. Statistical analyses of six variables (bud burst, bud set, 3-year height, spring and fall frost injuries, and deviation from regression of 3-year height on 2-year height) showed that populations not only differed in mean performance, but also reacted differently to the environmental gradient. Most of the population environment interaction was attributable to heterogeneous regressions of population means on environmental means. For all variables except growth rate, the variance of heterogeneous regression coefficients was explained by convergence of regression lines to a common point on the environmental gradient. Consequently, mean values for populations were significantly correlated with regression coefficients. Thus, main effects of populations in those single environments that induced the greatest mean differences reflected the interaction.https://www.fs.fed.us/rm/pubs_journals/1979/rmrs_1979_rehfeldt_g001.pdf315.0 KBhttps://www.fs.usda.gov/treesearch/pubs/38633386330Heredity. 43(3): 383-397.0433383397T0Rehfeldt, Gerald E.; 22-AUG-2011 13:48:1706-FEB-2017 21:33:39AY22-AUG-2011 13:48:5312Ecological adaptationRehfeldt, Gerald E.RMRS4157geraldrehfeldt1985001Rehfeldt, Gerald E.RMRS4157geraldrehfeldt1985001This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

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