. Ecological genetics of Pinus contorta in the Upper Snake River Basin of eastern Idaho and Wyoming. Lodgepole pine Idaho; Lodgepole pine Wyoming; Forests and forestry Research United States; Forest genetics; Trees Genetics. Table 7.—Average difference between the observed performance of peripheral populations and that expected from the elevational regressions Variable Lower Snake River Wasatch Mountain Deadline Ridge Growth and development Late growth (inches) Leaf length (inches) Height (inches) Adjusted height (inches) Frost injury (percent) Periodicity of shoot elongation Initiation (days)
. Ecological genetics of Pinus contorta in the Upper Snake River Basin of eastern Idaho and Wyoming. Lodgepole pine Idaho; Lodgepole pine Wyoming; Forests and forestry Research United States; Forest genetics; Trees Genetics. Table 7.—Average difference between the observed performance of peripheral populations and that expected from the elevational regressions Variable Lower Snake River Wasatch Mountain Deadline Ridge Growth and development Late growth (inches) Leaf length (inches) Height (inches) Adjusted height (inches) Frost injury (percent) Periodicity of shoot elongation Initiation (days) Duration (days) Rate (inches/days) Cessation (days) Elongation (inches) Cold hardiness Injury (percent) 0 .05 .13 .57 .3 .01 .58 drainages east of the Tetons. Significant intercorrela- tions between variables (table 6) produce the similar elevational and geographic clines. Particularly note- worthy are the correlations among variables associated with growth potential. Whether measured in the field or greenhouse, these correlations were extremely strong (r >). The performance of populations from geographic regions peripheral to the region of study is presented in table 7, relative to that expected for populations from the upper Snake River drainage at similar elevations. Populations from the Wasatch Mountains are of slightly lesser growth potential and slightly higher hardiness than populations from the upper Snake. But, the popula- tions tested from the lower Snake were of considerably lesser growth potential and higher hardiness than those from the upper Snake. However, disjunct populations from Deadline Ridge are of higher growth potential and lesser hardiness than populations from similar elevations in the upper Snake. DISCUSSION Genetic differentiation between populations from the upper Snake River Basin, like that for populations from nort
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