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Abstract Detail


Population Genetics

Brandsrud, Michelle [1], McGlaughlin, Mitchell E [1], Helenurm, Kaius [1].

Genetic comparison of a population of Coreopsis gigantea on San Clemente Island, California, to other island populations using microsatellite loci.

Coreopsis gigantea (Asteraceae) is a native species of California’s Channel Islands that illustrates several characteristics associated with island evolution: gigantism, woodiness and self-fertilization. Known from all eight islands, it was thought to be extirpated on San Clemente Island because of goats and other introduced herbivores that dominated the island ecosystems until their elimination in 1992. A single population was recently discovered on a steep slope on the eastern coast of San Clemente Island. Because of the remote location of this population, it is likely to represent re-emergence from a seed bank rather than dispersal from populations on other islands. This may provide an opportunity to evaluate the genetic diversity of a population that has not existed above-ground for many years. We used microsatellite loci to investigate the level of genetic variation relative to population size and island of occurrence, and to address the genetic relationship of the populations found throughout the Channel Islands. The San Clemente Island population is relatively depauperate in genetic variation compared with populations of varying sizes on other islands; in addition, the relative monomorphism of this population is suggestive of a genetic bottleneck.


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1 - University of South Dakota, Department of Biology, 414 E. Clark St, Vermillion, SD, 57069, USA

Keywords:
Channel Islands
microsatellites
Coreopsis gigantea.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P76007
Abstract ID:2151


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