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首页> 外文期刊>Auk >Using Historical Dna to Characterize Hybridization Between Baltimore Orioles (Icterus galbula) and Bullock's Orioles (I. bullockii)
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Using Historical Dna to Characterize Hybridization Between Baltimore Orioles (Icterus galbula) and Bullock's Orioles (I. bullockii)

机译：使用历史Dna来表征巴尔的摩金莺（Icterus galbula）和布洛克金莺（I. bullockii）之间的杂交

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Studies of genetic variation across hybrid zones have demonstrated that the evolutionary dynamics within them are often complicated. Using DNA extracted from toe pads of 701 individuals collected by Sibley and Short (class="ref NLM_xref-bibr" href="javascript:popRef2('bibr40')">1964) about 50 years ago from across the Icterus bullockii—I. galbula hybrid zone, we calculated mitochondrial cline shape parameters and compared them with plumage-based inferences of the hybrid-zone structure. Genetic and hybrid index score dines, estimated from populations collected along the Platte River in Nebraska, were both concordant (equal widths) and coincident (same center). More generally, the proportion of I. bullockii haplotypes within a sampling locality was strongly and significantly correlated with mean hybrid index scores across Colorado, Kansas, Nebraska, Oklahoma, and South Dakota. The relatively narrow width of the mitochondrial cline (328 km) indicates selection against hybridization, which may be mediated through differences in either molt and migration schedules or thermoregulatory capabilities (or both) of the parental species. Our results provide the first robust historical genetic characterization of this avian hybrid zone, laying the foundation for more in-depth investigations of temporal patterns of gene flow and introgression.
机译：对杂交区遗传变异的研究表明，它们之间的进化动力学通常很复杂。使用从Sibley and Short（class="ref NLM_xref-bibr" href="javascript:popRef2('bibr40')"> 1964 ）收集的大约701年前从脚趾垫中提取的DNA Ilterus bullockii — I。 galbula杂种带，我们计算了线粒体cline形状参数，并将其与基于羽毛的杂种带结构推断进行了比较。从内布拉斯加州的普拉特河沿岸采集的种群估计的遗传和杂种指数得分是一致的（等宽），也是一致的（同一中心）。通常， I 的比例。抽样地点内的 bullockii 单倍型与科罗拉多州，堪萨斯州，内布拉斯加州，俄克拉荷马州和南达科他州的平均杂种指数得分密​​切相关。线粒体的相对较窄的宽度（328 km）表明选择抗杂交，这可能是通过亲本物种的蜕皮和迁移时间表或温度调节能力（或两者）的差异来介导的。我们的结果提供了该禽类杂交区的第一个强大的历史遗传特征，为进一步深入研究基因流和基因渗入的时间型奠定了基础。

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