Genetic structure in a dynamic baboon hybrid zone corroborates behavioural observations in a hybrid population
Genetic structure in a dynamic baboon hybrid zone corroborates behavioural observations in a hybrid population
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DOI：
10.1111/j.1365-294x.2011.05302.x
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发表时间：
2012-02-01
影响因子：
4.9
通讯作者：
Tung, J.
中科院分区：
文献类型：
--
作者：
Charpentier, M. J. E.;Fontaine, M. C.;Tung, J.
行为和遗传结构是密切相关的：交配模式和群体或种群之间的运动模式影响着遗传变异在整个地貌上和从一代到下一代的移动。在杂交区，杂交类群的行为也会影响杂交事件的发生和结果。在肯尼亚的安博塞利盆地，黄狒狒和阿努比斯狒狒之间的杂交已经有了很好的记录，在那里，更多类似阿努比斯的个体往往会经历成熟和繁殖的优势。然而，目前尚不清楚这些优势是否反映在该地区周围种群的遗传结构中。在这里，我们使用微卫星基因型数据来评估肯尼亚南部狒狒种群的结构和组成。我们的结果表明，与线粒体DNA不同，基于微卫星的遗传结构测量与基于表型的分类差异一致，并且目前活跃的杂交区相对较窄。分离和迁移分析表明，该区域不对称的基因从阿努比斯种群流向黄色种群，支持在安博塞利观察到的阿努比斯偏向的表型优势。与远离入侵前沿的黄色种群相比，主要是黄色但接受Anubis基因流的种群表现出更高的遗传多样性水平。我们的结果支持了之前的工作，即东非狒狒之间的杂交和渗入有很长的历史。具体地说，它表明阿努比斯狒狒正处于逐渐扩大到黄狒狒范围的过程中，这一模式可能是由与阿努比斯祖先相关的行为和生活史优势解释的。
Behaviour 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.