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Patterns and Mechanisms of Evolution of Island Plants

Helenurm, Kaius [1], Wallace, Lisa [1].

Genetic diversity and differentiation of endemic plants of California.

California's Channel Islands are a group of eight islands lying within 100 miles of the coast of southern California. They were formed by a combination of volcanic action and uplift due to subduction between 0.5 and 5 mya and are thus a similar age as islands of other oceanic island archipelagos. Although 15% of the flora is endemic, genetic studies of plants have only been conducted recently. We present an overview of endemicity in these islands and summarize genetic studies of the endemic species. We present data of allozyme variation in 15 endemic species found on San Clemente Island, showing that levels of genetic variation vary widely. In addition, we present allozyme, RAPD and microsatellite data for three species found on more than one island (Crossosoma californicum, Lavatera assurgentiflora, and Scrophularia villosa) which indicate that little interisland differentiation has occurred.


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1 - University of South Dakota, Department of Biology, Vermillion, South Dakota, 57069, USA

Keywords:
island, genetic diversity.

Presentation Type: Symposium or Colloquium Presentation
Session: 50-2
Location: Salon J - Austin Grand Ballroom/Hilton
Date: Wednesday, August 17th, 2005
Time: 2:00 PM
Abstract ID:280


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