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Genetics Section

Cruse-Sanders, Jennifer [1], Friar, Elizabeth [1].

Gene flow, hybridization, and divergence between Hawaiian Dubautia species.

This study used microsatellites and paternity analysis to estimate pollen movement at a fine scale between Dubautia arborea and D. ciliolata. A well-documented hybrid zone occurs in the transitional habitat of Waipahoehoe Gulch on the slopes of Mauna Kea, Hawaii, and contains plants that represent a continuous morphological spectrum between the parental species. The two species are fully interfertile and occur in parapatry, but maintain distinct morphologies and ecological specialization. A core region within the hybrid zone was designated and every individual plant mapped and sampled for genetic analysis. Seeds from 15 maternal plants were collected, germinated, and genotyped using eight microsatellite loci. Additionally, 30 plants from adjacent pure populations of the parental species were genotyped. Within the active hybrid zone, mating appeared to be random with respect to plant phenotype, generating a wide array of intermediate forms. Therefore, gene flow was expected to follow an isolation by distance model. Results are interpreted in light of the role of hybridization in ecological divergence and the evolution of adaptive traits.


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1 - Rancho Santa Ana Botanical Garden, 1500 North College Avenue, Claremont, California, 91711, USA

Keywords:
evolution
island, genetic diversity
Hawaiian silversword alliance
paternity analysis
reproductive isolation
speciation.

Presentation Type: Poster
Session: 33-48
Location: Salon C, D & E - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 12:30 PM
Abstract ID:215


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