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Inter- and Intraspecific Variation in Pinon Pine Populations

The population size class distributions of eight Pinus edulis (Colorado pinon) and six P. cembroides (Mexican pinon) sites were analyzed and compared. In general, each species had the same range of diameters, with those of Mexican pinon smaller than those of Colorado pinon. Colorado pinon populations showed fluctuations in size-class distributions that were not evident in Mexican pinon stands. Interspecific differences were attributed to higher community densities in Mexican pinon stands. Direct evidence of mortality across size classes in Colorado pinon partially corroborated indirect mortality estimates from extant stand distributions. The cumulative stand distribution of P. edulis resembles that of several Rocky Mountain climax species, indicating that climax species may indeed have coincident cumulative size distributions.