Jolles, Diana .
How is reproductive isolation maintained in the Pyrola picta species complex, a group of species with remarkably similar flowers?
The Pyrola picta species complex (Monotropoideae: Ericaceae) is composed of at least four species that are restricted to western North America. These species have remarkably similar floral morphology and phenology given the fact that genetic lineages have largely achieved (and maintained) reproductive isolation across shared biogeographic ranges. In this study, maintenance of reproductive isolation was investigated in the context of lineage dispersal history by observing pollinators, recording aspects of flowering phenology, and conducting experimental crosses among species in multiple, sympatric populations in northern California. Findings suggest that, despite the fact that different species share the same pollinators (Bombus species), basic floral morphology, and buzz-pollination syndrome, low levels of hybridization in sympatric populations are associated with subtle differences in floral phenology and significantly different rates of fertilization in response to experimental crosses.
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1 - Rancho Santa Ana Botanic Garden, Claremont Graduate University, 1500 North College Avenue, Claremont, CA, 91711, USA
Presentation Type: Oral Paper:Papers for Topics
Location: Delaware D/Hyatt
Date: Wednesday, July 11th, 2012
Time: 4:45 PM