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Genetics, Vol. 168, 1601-1614, November 2004, Copyright © 2004
doi:10.1534/genetics.104.027714
Fine-Scale Genetic Structure and Gene Dispersal in Centaurea corymbosa (Asteraceae). II. Correlated Paternity Within and Among Sibships
Olivier J. Hardy*,
,1,
Santiago C. González-Martínez,
,
Bruno Colas
,
Hélène Fréville,**,
Agnès Mignot and
Isabelle Olivieri
* Laboratoire de Génétique et Ecologie Végétales, Université Libre de Bruxelles, 1160 Brussels, Belgium
Unidad de Genética Forestal, Centro de Investigación Forestal, Instituto Nacional de Investigación Agraria y Tecnología Alimentaria, 28040 Madrid, Spain
Institut des Sciences de l'Evolution de Montpellier, Université de Montpellier 2, 34035 Montpellier, France
Laboratoire Fonctionnement et Evolution des Systèmes Ecologiques, Université de Paris VI, 75252 Paris, France
** Département Ecologie et Gestion de la Biodiversité, UMR 5176 CNRS-MNHN, 91800 Brunoy, France
1 Corresponding author: Laboratoire d'Eco-éthologie Evolutive, Université Libre de Bruxelles, CP 160/12, 50 Av. F. Roosevelt, 1050 Brussels, Belgium.
E-mail: ohardy{at}ulb.ac.be
The fine-scale pattern of correlated paternity was characterized within a population of the narrow-endemic model plant species, Centaurea corymbosa, using microsatellites and natural progeny arrays. We used classical approaches to assess correlated mating within sibships and developed a new method based on pairwise kinship coefficients to assess correlated paternity within and among sibships in a spatio-temporal perspective. We also performed numerical simulations to assess the relative significance of different mechanisms promoting correlated paternity and to compare the statistical properties of different estimators of correlated paternity. Our new approach proved very informative to assess which factors contributed most to correlated paternity and presented good statistical properties. Within progeny arrays, we found that about one-fifth of offspring pairs were full-sibs. This level of correlated mating did not result from correlated pollen dispersal events (i.e., pollen codispersion) but rather from limited mate availability, the latter being due to limited pollen dispersal distances, the heterogeneity of pollen production among plants, phenological heterogeneity and, according to simulations, the self-incompatibility system. We point out the close connection between correlated paternity and the "TwoGener" approach recently developed to infer pollen dispersal and discuss the conditions to be met when applying the latter.
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