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Genetics Section

Crowder, Michelle [1], Stratton, Don [2].

Evolutionary Impacts of Small Population Size and Geographic Isolation in Arabis lyrata [Brassicaceae].

Arabis lyrata [Brassicaceae] is a circumboreal species that reaches its range limit in North America near the Green Mountains of Vermont. Populations in Vermont grow on isolated rocky outcrops and are small relative to those farther south and west. Using common garden studies and cross-pollination experiments, the evolutionary impacts of small population size and geographic isolation were characterized for this species. To compare genetic diversity and evolutionary potential in small and large populations, seeds were collected from 3 small populations and 9 large populations in Vermont, New York, and the Great Lakes region. Common garden studies were used to estimate heritabilites for both morphological and life history traits, which were in turn used to relate genetic variation within a population to population size. To test for early stages in the formation of genetic barriers between populations, cross-pollinations were performed within and between populations at scales of 0-1000 km. Results are interpreted in relation to their impact on evolution in small populations.


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1 - University of Vermont, Botany, 120 Marsh Life Sciences, Burlington, Vermont, 05405, USA
2 -

Keywords:
Arabis lyrata
small population size
reproductive isolation
genetic variation.

Presentation Type: Poster
Session: 33-46
Location: Salon C, D & E - Gov Ballroom/Hilton
Date: Tuesday, August 16th, 2005
Time: 12:30 PM
Abstract ID:300


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