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Population differentiation among three species of white oak in northeastern Illinois

Summary: Population differentiation among three species of
white oak in northeastern Illinois
Kathleen J. Craft and Mary V. Ashley
Abstract: We used microsatellite DNA analysis to examine population differentiation among three species of white
oak, Quercus alba L., Quercus bicolor Willd., and Quercus macrocarpa Michx., occurring in both pure and mixed
stands in northeastern Illinois. Using individual-based Bayesian clustering or principal components analyses, no strong
genetic groupings of individuals were detected. This suggests that the three species do not represent distinct and differ-
entiated genetic entities. Nevertheless, traditional approaches where individuals are pre-assigned to species and popula-
tions, including F statistics, allele frequency analysis, and Nei's genetic distance, revealed low, but significant genetic
differentiation. Pairwise F statistics showed that some intraspecific comparisons were as genetically differentiated as
interspecific comparisons, with the two populations of Q. alba exhibiting the highest level of genetic differentiation ( =
0.1156). A neighbor-joining tree also showed that the two populations of Q. alba are distinct from one another and
from the two other species, while Q. bicolor and Q. macrocarpa were genetically more similar. Pure stands of
Q. macrocarpa did not show a higher degree of genetic differentiation than mixed stands.
Résumé : Les auteurs ont utilisé l'analyse des microsatellites d'ADN pour étudier la différenciation des populations
parmi trois espèces de chêne blanc, Quercus alba L., Quercus bicolor Willd. et Quercus macrocarpa Michx., du nord-
est de l'Illinois retrouvées en peuplements purs ou mélangés. Une analyse bayésienne de regroupement et une analyse
en composantes principales ont été réalisées à partir des données individuelles. Aucun regroupement génétique particu-
lier d'individus n'a été observé, ce qui indique que les trois espèces ne constituent pas des entités génétiques distinctes
et différenciées. Néanmoins, des approches traditionnelles où les individus sont assignés a priori aux diverses popula-


Source: Ashley, Mary V. - Department of Biological Sciences, University of Illinois at Chicago


Collections: Biology and Medicine; Environmental Sciences and Ecology