Allopatry, hybridization, and reproductive isolation in Arctostaphylos: phenology and field morphology

V. Thomas Parker
Premise of the study: Hybridization plays a key role in introgressive adaptation, speciation, and adaptive radiation as a source of evolutionary innovation. Hybridization is considered common in Arctostaphylos, yet species boundaries are retained in stands containing multiple species. Arctostaphylos contains diploids and tetraploids, and recent phylogenies indicate two clades; we hypothesize combinations of these traits limit or promote hybridization rates. Methods: We statistically analyzed co-occurrence patterns of species by clade membership and ploidy level from...
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