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Abstract Detail


Population Genetics

Moore, Abigail [1], Moore, William L. [2], Baldwin, Bruce G. [3].

Habitat specialization in California Floristic Province Grindelia.

Grindelia (Asteraceae: Astereae) has an amphitropical disjunct distribution in the New World. It occurs in a wide range of dry, open habitats. Within Grindelia, the species native to the California Floristic Province and the adjacent Pacific coast of North America form a monophyletic group. Members of this clade appear to have radiated recently into a wide range of habitats including grassland, salt marshes, coastal bluffs, and serpentine. The internal branches of molecular trees are extremely short and the members of the clade are able to form fertile hybrids with other plants at the same ploidy level. Taxonomic opinion has varied widely, with some workers dividing the clade into many species based on habitat and associated differences in habit and phenology and others grouping them into a single species based on their ability to hybridize and the range of variation within some of the putative species. We are using microsatellite data to examine the patterns associated with maintenance of habitat specialization and morphological differences in the face of potential gene flow. A pair of taxa within the California Floristic Province clade that occur parapatrically are being examined: G. camporum and G. stricta var. angustifolia. Grindelia camporum grows in grasslands, while G. stricta var. angustifolia grows in tidal salt marshes and sloughs surrounding the San Francisco Bay.


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1 - University of California Berkeley, Department of Integrative Biology, University and Jepson Herbaria, 3060 Valley Life Sciences Building, Berkeley, California, 94720, USA
2 - University of Utah, David Eccles School of Business, 1645 E. Campus Center Dr. #101, Salt Lake City, UT, 84112, USA
3 - University of California, Berkeley, Jepson Herbarium and Department of Integrative Biology, 1001 Valley Life Sciences Building #2465, Berkeley, CA, 94720-2465, USA

Keywords:
Grindelia
California Floristic Province
tetraploidy
Asteraceae.

Presentation Type: Oral Paper:Papers for Topics
Session: 40
Location: Cottonwood D/Snowbird Center
Date: Tuesday, July 28th, 2009
Time: 9:00 AM
Number: 40001
Abstract ID:116


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