University of Wyoming
FACW_ZOO_2009_15372197_Garcia_Siepielski_Benkman.pdf (708.96 kB)

Cone and Seed Trait Variation in Whitebark Pine (Pinus Albicaulis; Pinaceae) and the Potential for Phenotypic Selection

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posted on 2021-11-15, 21:32 authored by R. Garcia, A. M. Siepielski, Craig Benkman
Phenotypic variation among, individuals is necessary for natural selection to operate and is therefore essential for adaptive evolution. However, extensive variation within individuals can mask variation among individuals and weaken the potential for selection. Here we quantify variation among within individuals in female cone and seed traits of whitebark pine (Pinus albicaulis). In many plants the production of numerous reproductive structures creates the potential for considerable variation within a plant, but these same traits should also undergo strong selection because of their direct link to plant fitness. We found about twice as much variation among individuals (overall mean = 65.3 ± 4.5% SE) than within individuals (overall mean = 34.7 ± 4.5%). One only needs to sample three to five cones per free to accurately assess variation among, trees in most cone and seed traits. The case at which trees can be assessed helps account for the strong and consistent patterns of phenotypic selection exerted by seed predators mid dispersers of whitebark pine and many other Conifers. In contrast, the few traits where variation within trees equaled or exceeded that among trees underwent weak if any phenotypic selection.







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Journal title

American Journal of Botany


Faculty Publication - Zoology and Physiology


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