Not as the crow flies: a historical explanation for circuitous migration in Swainson's thrush (Catharus ustulatus)
Not as the crow flies: a historical explanation for circuitous migration in Swainson's thrush (Catharus ustulatus)
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不像乌鸦飞翔：斯温森画眉（Catharus ustulatus）迂回迁徙的历史解释
DOI：
10.1098/rspb.2002.2032
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发表时间：
2002
期刊：
影响因子：
--
通讯作者：
T. Smith
中科院分区：
文献类型：
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作者：
Kristen C. Ruegg;T. Smith
许多迁徙鸣禽遵循迂回的迁徙路线，而不是在越冬区和繁殖区之间采取最短路线。在这里，我们利用分子遗传学方法研究了斯温森画眉（Catharus ustulatus）（一种近热带-新热带候鸟）的迁徙模式。该物种目前被分为遗传上不同的沿海和大陆种群，这些种群在更新世晚期出现分歧（分子测年表明），但似乎保留了祖先的迁徙模式。低核苷酸多样性、星状单倍型系统发育和单峰错配分布都支持沿海和大陆人口最近经历了人口扩张的假设。近北-新热带区带和遗传数据显示，迁徙路线和越冬地点几乎完全隔离：沿海种群沿着太平洋海岸迁徙到中美洲和墨西哥的越冬地点，而大陆种群则沿着东部路线迁徙到巴拿马和南美洲的越冬地点。近北区-新热带区带数据还显示，这一迁徙分水岭以北、西北和东部的大陆鸟类在向南飞行之前会向东飞行数千英里。我们得出的结论是，斯温森画眉的迂回迁徙是更新世晚期范围扩张的产物。
Many migratory songbirds follow circuitous migratory routes instead of taking the shortest path between overwintering and breeding areas. Here, we study the migration patterns in Swainson's thrush (Catharus ustulatus), a neartic–neotropical migrant songbird, using molecular genetic approaches. This species is presently separated into genetically distinct coastal and continental populations that diverged during the Late Pleistocene (as indicated by molecular dating), yet appear to have retained ancestral patterns of migration. Low nucleotide diversity, a star–like haplotype phylogeny and unimodal mismatch distributions all support the hypothesis that both the coastal and the continental populations have undergone recent demographic expansions. Nearctic–neotropical banding and genetic data show nearly complete segregation of migratory routes and of overwintering locations: coastal populations migrate along the Pacific Coast to overwintering sites in Central America and Mexico, whereas continental populations migrate along an eastern route to overwintering sites in Panama and South America. Nearctic–neotropical banding data also show that continental birds north, northwest and east of this migratory divide fly thousands of miles east before turning south. We conclude that circuitous migration in the Swainson's thrush is an artefact of a Late Pleistocene range expansion.