A migratory divide spanning two continents is associated with genomic and ecological divergence
A migratory divide spanning two continents is associated with genomic and ecological divergence
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DOI：
10.1111/evo.14448
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发表时间：
2022-02-23
期刊：
影响因子：
3.3
通讯作者：
Safran, Rebecca J.
中科院分区：
文献类型：
--
作者：
Turbek, Sheela P.;Schield, Drew R.;Safran, Rebecca J.
迁徙分水岭是在非繁殖季节，具有不同迁徙策略的繁殖种群之间的接触区。这些地点提供了一个机会，以评估季节性迁移在维持生殖隔离的作用，特别是人口结构和功能与不同的迁移策略之间的关系。我们结合联合收割机光级地理定位仪，基因组测序，和稳定同位素调查的迁移时间和迁移路线的个人繁殖的任何一方的迁移鸿沟与基因组分化之间的杂交区家燕（Hirundo rustica）亚种在中国。杂交区以西的个体，与H. R. rustica祖先，具有相对丰富的稳定碳和氢同位素值，并在非洲东部越冬，而混合区以东的鸟类，与H。R. gutturalis祖先，耗尽了同位素值，并迁移到印度南部。这两个亚种沿着高海拔的喀喇昆仑山脉采取不同的迁徙路线，并在3周内到达繁殖地。这些结果表明，通过到达时间和/或针对具有中间迁徙特征的杂种进行选择来进行选型交配可能会维持亚种之间的生殖隔离，并且不适宜居住的地理特征可能通过影响迁徙模式而促进了亚洲鸟类区系的多样化。
Migratory divides are contact zones between breeding populations with divergent migratory strategies during the nonbreeding season. These locations provide an opportunity to evaluate the role of seasonal migration in the maintenance of reproductive isolation, particularly the relationship between population structure and features associated with distinct migratory strategies. We combine light-level geolocators, genomic sequencing, and stable isotopes to investigate the timing of migration and migratory routes of individuals breeding on either side of a migratory divide coinciding with genomic differentiation across a hybrid zone between barn swallow (Hirundo rustica) subspecies in China. Individuals west of the hybrid zone, with H. r. rustica ancestry, had comparatively enriched stable-carbon and hydrogen isotope values and overwintered in eastern Africa, whereas birds east of the hybrid zone, with H. r. gutturalis ancestry, had depleted isotope values and migrated to southern India. The two subspecies took divergent migratory routes around the high-altitude Karakoram Range and arrived on the breeding grounds over 3 weeks apart. These results indicate that assortative mating by timing of arrival and/or selection against hybrids with intermediate migratory traits may maintain reproductive isolation between the subspecies, and that inhospitable geographic features may have contributed to the diversification of Asian avifauna by influencing migratory patterns.