if one were selecting only those families that were in the top 10 percent group for 

 height in any one test, very few of the high-elevation families would be selected 

 (table 14) . Among the lower elevation zones there again appeared to be no pattern to 

 the variation. 



The general finding from these studies that seedlings from high elevation trees are 

 slower growing than those from lower trees agrees with the results reported earlier by 

 Squillace and Bingham (1958). However, these data do not agree with their findings that 

 high-elevation families grew slower than low-elevation families in a low nursery and low 

 plots but faster at a high plot. In the vigor-quality study, low-elevation families were 

 significantly taller than high-elevation families at both low- and mid-test sites. While 

 the differences in sites were not as great as in Squillace and Bingham's study, the site 

 means did differ significantly and there was no indication of the high-elevation families 

 growing faster at the higher site. In fact, the difference between low- and high-eleva- 

 tion families was greater at the higher site even though total height was less. Simi- 

 larly, as mentioned above, in the elevational study high-elevation families were as tall 

 or slightly taller than low- or mid-elevation families at the low sites but slightly 

 shorter at the high sites. Thus, up to this time the results of the present studies 

 suggest that groups of families representing various elevational zones perform nearly 

 the same whether tested at low-, mid-, or high-elevation sites. ' 



Table 14. --Ratio of trees in top 10 pevcent group in various studies 



Study 



Seed collection elevational zone 



Low 



Mid 



High 



Elevational 



Nursery 1/7 1/11 1/39 



Ida Creek 1/7 1/10 1/35 

 PREF 



Low site 1/20 1/7 1/10 



Mid site 1/4 1/20 



High site 1/20 1/7 1/10 



X 1/9 1/10 1/12 



Canyon 



Low site 1/10 1/5 



Mid site 1/20 1/20 1/5 



High site 1/5 1/6 



X 1/12 1/20 1/6 



Natural selection 1/7 1/17 1/33 



Factorial mating design 1/5 1/8 1/36 



Overall 1/7 1/10 1/26 



18 



