Selection and geographic isolation influence hummingbird speciation: genetic, acoustic and morphological divergence in the wedge-tailed sabrewing (Campylopterus curvipennis).
Selection and geographic isolation influence hummingbird speciation: genetic, acoustic and morphological divergence in the wedge-tailed sabrewing (Campylopterus curvipennis).
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DOI：
10.1186/1471-2148-11-38
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发表时间：
2011-02-08
影响因子：
3.4
通讯作者：
Gutiérrez-Rodríguez C
中科院分区：
文献类型：
--
作者：
González C;Ornelas JF;Gutiérrez-Rodríguez C
中美洲是世界上最受威胁的生物多样性热点之一，但我们还远未了解地质历史和驱动大多数地方性类群的种群分化和物种形成的过程。在高度分化的种群中，选择性和/或中性因素可以诱导涉及配偶选择的性状发生快速变化，促进异域种群之间的生殖隔离，最终导致物种形成。我们提出的遗传分化的结果，并探讨漂移和选择的影响，在促进声学和形态的分歧Campylopterus curvipennis，lekking蜂鸟在中美洲具有非凡的声乐变异种群之间。对160个个体的两个线粒体基因和10个微卫星位点的基因型分析显示，存在三个没有当代基因流的谱系：C。C. curvipennis、弯翅拟步行虫C. C. excellens和C. C.潘帕草原间断分布于东方马德雷山脉、图斯特拉地区和尤卡坦半岛。序列mtDNA和微卫星数据与两个多样化事件一致：一个古老的地理变异事件在特万特佩克地峡（c。1.4马），以及更新世分裂，孤立的人口在图斯特拉斯地区。excellens群的蜂鸟体型较大，而pampa群的蜂鸟喙较短，被隔离时间最长的谱系共享较少的音节，并且共享音节的频谱和时间特征不同。聚结模拟表明，固定的歌曲类型发生的速度比预期的中立，但零假设，形态分歧导致漂移没有被拒绝。我们的地理学分析揭示了三个中美洲楔尾剑翅谱系的存在，这在不同的时间尺度分歧。这些结果突出了特万特佩克地峡和更新世气候事件在驱动隔离和人口分化的重要性。表型性状的进化的融合分析表明，选择是推动歌曲的演变，楔尾剑翅，但漂移不能被拒绝作为一种可能的形态分歧。
Mesoamerica is one of the most threatened biodiversity hotspots in the world, yet we are far from understanding the geologic history and the processes driving population divergence and speciation for most endemic taxa. In species with highly differentiated populations selective and/or neutral factors can induce rapid changes to traits involved in mate choice, promoting reproductive isolation between allopatric populations that can eventually lead to speciation. We present the results of genetic differentiation, and explore drift and selection effects in promoting acoustic and morphological divergence among populations of Campylopterus curvipennis, a lekking hummingbird with an extraordinary vocal variability across Mesoamerica. Analyses of two mitochondrial genes and ten microsatellite loci genotyped for 160 individuals revealed the presence of three lineages with no contemporary gene flow: C. c. curvipennis, C. c. excellens, and C. c. pampa disjunctly distributed in the Sierra Madre Oriental, the Tuxtlas region and the Yucatan Peninsula, respectively. Sequence mtDNA and microsatellite data were congruent with two diversification events: an old vicariance event at the Isthmus of Tehuantepec (c. 1.4 Ma), and a more recent Pleistocene split, isolating populations in the Tuxtlas region. Hummingbirds of the excellens group were larger, and those of the pampa group had shorter bills, and lineages that have been isolated the longest shared fewer syllables and differed in spectral and temporal traits of a shared syllable. Coalescent simulations showed that fixation of song types has occurred faster than expected under neutrality but the null hypothesis that morphological divergence resulted from drift was not rejected. Our phylogeographic analyses uncovered the presence of three Mesoamerican wedge-tailed sabrewing lineages, which diverged at different time scales. These results highlight the importance of the Isthmus of Tehuantepec and more recent Pleistocene climatic events in driving isolation and population divergence. Coalescent analyses of the evolution of phenotypic traits suggest that selection is driving song evolution in wedge-tailed sabrewings but drift could not be rejected as a possibility for morphological divergence.
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影响因子：
4.9
作者：
Clement, M;Posada, D;Crandall, KA
通讯作者：
Crandall, KA
影响因子：
2.8
作者：
Hahn, TP;Sockman, KW;Morton, ML
通讯作者：
Morton, ML
影响因子：
2.6
作者：
Excoffier, Laurent;Laval, Guillaume;Schneider, Stefan
通讯作者：
Schneider, Stefan
DOI：
10.1073/pnas.081068098
发表时间：
2001-04-10
影响因子：
11.1
作者：
Beerli, P;Felsenstein, J
通讯作者：
Felsenstein, J
影响因子：
2.1
作者：
Dingle, C.;Halfwerk, W.;Slabbekoorn, H.
通讯作者：
Slabbekoorn, H.