Systematics and Historical Biogeography of Wagtails: Dispersal Versus Vicariance Revisited

• Published in: The Condor
• Main Author: Voelker, Gary
• Format: Article in Journal/Newspaper
• Language: English
• Published: Oxford University Press (OUP) 2002
• Subjects: Animal Science and Zoology; Ecology, Evolution, Behavior and Systematics; Greenland; Alaska
• Online Access: http://dx.doi.org/10.1093/condor/104.4.725; http://academic.oup.com/condor/article-pdf/104/4/725/29712659/condor0725.pdf

Abstract Nucleotide sequences of the mitochondrial cytochrome b and ND2 genes were used in analyses of phylogenetic relationships of 10 of the 11 currently recognized species of wagtails (Aves: Motacilla). All analyses produced similar hypotheses of species relationships. Both Motacilla citreola and M. flava are paraphyletic, and consist of two and three distinct clades, respectively. M. lugens and M. alba are paraphyletic with respect to one another. None of the three currently recognized superspecies are monophyletic. A series of alternative tree topologies on which species and superspecies monophyly were enforced were significantly worse estimates of relationships in all cases except that of lugens and alba. Ancestral area reconstructions suggest that Motacilla arose in the eastern Palearctic; molecular-clock dates suggest that this occurred roughly 4.5 million years ago. Motacilla colonized Africa around 4.5 million years ago, and accomplished a second ancestral colonization of that continent about 2.9 million years ago. A number of recent dispersals from Eurasia to North Africa and North America (via both Alaska and Greenland) have occurred, and no fewer than 26 dispersals have occurred throughout the evolution of the modern distribution of this genus. This result, similar to results of other recently studied avian lineages, strongly suggests that dispersal has been an important factor in the development of modern-day avian distributions. Sistemática y Biogeografía Histórica de Motacilla: Revisión de Dispersión Versus Vicarianza Resumen. Se usaron secuencias de nucleótidos de los genes mitocondriales citocromo b y ND2 en análisis de relaciones filogenéticas en 10 de las 11 especies de aves actualmente reconocidas del género Motacilla. Todos los análisis produjeron hipótesis similares sobre las relaciones entre las especies. Tanto M. citreola como M. flava son parafiléticas, con dos y tres clados distintivos, respectivamente. M. lugens y M. alba son parafiléticas en relación a una con la otra. Ninguna de las ...