. Ecological genetics of Pinus contorta in the Upper Snake River Basin of eastern Idaho and Wyoming . 5440 5840 0 10 20 30 40 50 DAYS Figure 2.—Periodicity of stioot elongation for populations from a range of elevations (feet) ttiat represented maximum differences in response. Patterns of Variation Elevation of the seed source had a pronounced effect on population performance (table 5, fig. 3). Elevational models accounted for more than 70 percent of the vari- ance between populations for five variables and were statistically significant for all variables except the initia- tion of shoot elong
. Ecological genetics of Pinus contorta in the Upper Snake River Basin of eastern Idaho and Wyoming . 5440 5840 0 10 20 30 40 50 DAYS Figure 2.—Periodicity of stioot elongation for populations from a range of elevations (feet) ttiat represented maximum differences in response. Patterns of Variation Elevation of the seed source had a pronounced effect on population performance (table 5, fig. 3). Elevational models accounted for more than 70 percent of the vari- ance between populations for five variables and were statistically significant for all variables except the initia- tion of shoot elongation. As elevation increases, growth potential decreases, largely because of an associated decline in late growth and in the rate, duration, and ces- sation of shoot elongation. Leaf lengths also decline with Table 3.—Results of analyses of variance for periodicity of shoot elongation presented as intraclass correlations, the ratio of a variance component to the sum of all components Source of variance Initiation Duration Rate Cessation Elongation Blocks ** ** ** 0 Populations .02 .22** .21** ** .38** Interaction .15** 0 .06 0 .03* Within plots .73 .73 .70 .77 .58 'Statistical significance of the F-value at the 5 percent level. "Statistical significance of the F-value at the 1 percent level. 4
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