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Journal of Heredity Advance Access originally published online on September 19, 2006
Journal of Heredity 2006 97(5):451-455; doi:10.1093/jhered/esl022
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© The American Genetic Association. 2006. All rights reserved. For permissions, please email: journals.permissions@oxfordjournals.org.

Mating Patterns of Black Oak Quercus velutina (Fagaceae) in a Missouri Oak-Hickory Forest

Juan F. Fernández-Manjarrés, Jacquelyn Idol, and Victoria L. Sork

From the Laboratoire d'Ecologie, Systématique et Evolution, Bât 360, Université Paris 11 Sud, 91405 Orsay Cedex, France (Fernández-Manjarrés); the National Human Genome Research Institute, National Institute of Health, Bethesda, MD 20892 (Idol); and the Department of Ecology and Evolutionary Biology, The University of California at Los Angeles, CA 90095-1606 (Sork)

Address correspondence to J. F. Fernández-Manjarrés at the address above, or e-mail: juan.fernandez{at}ese.u-psud.fr.

Wind-pollinated forest trees usually have high outcrossing rates, but allogamy does not necessarily translate into high pollen movement. The goal of this study was to determine the outcrossing rates, pollen pool genetic structure, and the size of the effective pollination neighborhood in a population of black oak, Quercus velutina, in a Missouri oak-hickory forest. Based on 6 allozyme loci, 12 maternal trees, and 439 progenies sampled along a transect of 1300 m, we found complete outcrossing (tm = 1.000, P < 0.001) and small amounts of biparental inbreeding. Using a TwoGener analysis of the pollen gene pool, we found significant structure across maternal plants ({Phi}FT = 0.078, P < 0.001), which when corrected for adult inbreeding translates into {Phi}FT = 0.066 that corresponds to an effective number of pollen donors of 7.5 individuals. Assuming a bivariate normal distribution and an adult density of 16.25 trees ha–1, we estimated that the effective pollination neighborhood area had a radius of 41.9 m. Even assuming that our estimates may be conservative, these findings join a growing body of evidence that suggest that the local neighborhood of wind-pollinated forest tree populations may be relatively small creating opportunities for local selection and genetic drift.


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