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Journal of Heredity Advance Access originally published online on September 8, 2005
Journal of Heredity 2005 96(6):635-643; doi:10.1093/jhered/esi104
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© The American Genetic Association. 2005. All rights reserved. For permissions, please email: journals.permissions@oupjournals.org.

Mating Patterns of a Subdivided Population of the Andean Oak (Quercus humboldtii Bonpl., Fagaceae)

J. F. Fernández-M., and V. L. Sork

From the Laboratoire d'Ecologie, Systématique et Evolution, Bât 360, Université Paris Sud XI, 91405 Orsay Cedex, France (Fernández); and Department of Ecology and Evolutionary Biology, University of California–Los Angeles, Los Angeles, CA 90095-1606 (Sork)

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

Mating patterns play a critical role in the maintenance of genetic variation. We analyzed the mating system in a recently fragmented population of the Andean oak (Quercus humboldtii) using four microsatellite loci. Five fragments in northeastern Colombia, South America, were selected consisting of 30.4 trees on average. We sampled about 30 seeds from three target trees in each fragment and genotyped them with four microsatellite loci with a total of 40 alleles across loci. Progenies were analyzed under the mixed mating system model (MLTR program) and the TwoGener pollen pool structure analyses. The number of unshared pollen donors per family (Nu) was estimated using gametotypic counts with the program HAPLOTYPES. Low selfing (3%) is occurring at the population and fragment level. Biparental inbreeding is present (4.9%), but reduced, in the largest fragment. The average pollen neighborhood size (Nep = 5.1 to 6.1) appears comparable to other oak species in sparse landscapes. In contrast, Nu consists of 2 to 4 main donors, although up to 12 are possible, with the mode positively correlated with fragment size. The Andean oak appears to be a resilient species capable of tolerating population subdivision, provided landscapes include large fragments.


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J. F. Fernandez-Manjarres, J. Idol, and V. L. Sork
Mating Patterns of Black Oak Quercus velutina (Fagaceae) in a Missouri Oak-Hickory Forest
J. Hered., September 1, 2006; 97(5): 451 - 455.
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