Genetic structure in a dynamic baboon hybrid zone corroborates behavioural observations in a hybrid population

Molecular Ecology - Tập 21 Số 3 - Trang 715-731 - 2012
Marie Charpentier1, Michaël C. Fontaine2,3, E. CHEREL1, Julien P. Renoult4, Todd M. Jenkins1, Laure Benoit1,5, N. BARTHÈS1, Susan C. Alberts6,7, Jenny Tung8
1CEFE-CNRS UMR 5175, 1919 Route de Mende, 34293 Montpellier Cedex 5, France
2Ecoanthropology and Ethnobiology UMR 5145 CNRS-MNHN-Université Paris, 7 Musée de l’Homme, 75016 Paris cedex, France
3Ecologie, Systématique et Evolution, Université Paris-Sud, and CNRS F-91405 Orsay Cedex, France
4Department of Evolutionary Biology and Animal Ecology, Faculty of Biology, University of Freiburg, Hauptstrasse 1, 79104, Freiburg, Germany
5CIRAD, UMR 101, Avenue Agropolis, 34398 Montpellier Cedex 5, France
6Department of Biology, Duke University, Box 90338, Durham, NC 27708, USA
7Institute of Primate Research, National Museums of Kenya, PO Box 24481, Nairobi, Kenya
8Department of Human Genetics, University of Chicago, 920 E 58th St, Chicago, IL 60637, USA

Tóm tắt

AbstractBehaviour and genetic structure are intimately related: mating patterns and patterns of movement between groups or populations influence the movement of genetic variation across the landscape and from one generation to the next. In hybrid zones, the behaviour of the hybridizing taxa can also impact the incidence and outcome of hybridization events. Hybridization between yellow baboons and anubis baboons has been well documented in the Amboseli basin of Kenya, where more anubis‐like individuals tend to experience maturational and reproductive advantages. However, it is unknown whether these advantages are reflected in the genetic structure of populations surrounding this area. Here, we used microsatellite genotype data to evaluate the structure and composition of baboon populations in southern Kenya. Our results indicate that, unlike for mitochondrial DNA, microsatellite‐based measures of genetic structure concord with phenotypically based taxonomic distinctions and that the currently active hybrid zone is relatively narrow. Isolation with migration analysis revealed asymmetric gene flow in this region from anubis populations into yellow populations, in support of the anubis‐biased phenotypic advantages observed in Amboseli. Populations that are primarily yellow but that receive anubis gene flow exhibit higher levels of genetic diversity than yellow populations far from the introgression front. Our results support previous work that indicates a long history of hybridization and introgression among East African baboons. Specifically, it suggests that anubis baboons are in the process of gradual range expansion into the range of yellow baboons, a pattern potentially explained by behavioural and life history advantages that correlate with anubis ancestry.

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Molecular Ecology

Tập 21 Số 3

715-731

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