Craft, KJ , Ashley, MV .
Pollen-mediated Gene Flow in Isolated and Continuous stands of Bur Oak, Quercus macrocarpa.
Contemporary pollen flow was examined using parentage analysis in three populations of Quercus macrocarpa in northeastern Illinois using DNA microsatellites. In order to assess differences in pollen-mediated gene flow in isolated and continuous stands, we genotyped all adults and 787 acorns from two isolated prairie remnants and a stand located in a continuous old-growth forest. Outside pollinations accounted for between 47% and 54% of paternities and did not differ significantly among sites, indicating that similar, high levels of gene flow occurred in both isolated and forested stands. Genetic diversity of incoming pollen was extremely high. Within stands, the mean pollination distance ranged from 42 to 70 meters, and at two of the three sites within-stand pollinations were random with respect to distance between pollen donor and maternal tree. When accounting for outside pollinations, mean pollination distances were well over 100 meters. Our findings indicate that even extremely isolated stands of oaks are unlikely to be genetically and reproductively isolated.
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1 - University of Minnesota, Plant Biology, 250 Biological Sciences Center, 1445 Gortner Ave., St. Paul, MN, 55108, U.S.A.
2 - University of Illinois at Chicago, Biological Sciences, 845 W. Taylor St., Chicago, IL, 60607, USA
Presentation Type: Oral Paper:Papers for Topics
Location: PDR 4/Hilton
Date: Monday, July 9th, 2007
Time: 11:30 AM