Phylogeny and biogeography of the New World siskins and goldfinches: rapid, recent diversification in the Central Andes

Molecular Phylogenetics and Evolution
Elizabeth J Beckman, Christopher C Witt

Abstract

Time-calibrated molecular phylogenies can help us to understand the origins of the diverse and unique Andean avifauna. Previous studies have shown that the tempo of diversification differed between the Andes and adjacent lowland regions of South America. Andean taxa were found to have speciated more recently and to have avoided the decelerated diversification that is typical of Neotropical lowland clades. The South American siskins, a Pleistocene finch radiation, may typify this Andean pattern. We investigated the phylogenetic biogeography of all the New World siskins and goldfinches in new detail. To understand the specific role of the Andes in siskin diversification, we asked: (1) Was diversification faster in Andean siskin lineages relative to non-Andean ones? (2) Did siskin lineages move into and out of the Andes at different rates? We found that siskin lineages in the Andes had higher diversification rates and higher outward dispersal rates than siskin lineages outside the Andes. We conclude that páramo expansion and contraction in response to Pleistocene climatic cycles caused accelerated diversification and outward dispersal in Andean siskins. The younger average age of bird species in the Andes compared to lowland South...Continue Reading

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Citations

Apr 8, 2017·Scientific Reports·Donna Lisa De-SilvaMarianne Elias
Dec 15, 2017·Ecology and Evolution·Jean-François PongeÉric Guilbert
Jul 18, 2018·Molecular Ecology·Elizabeth J BeckmanChristopher C Witt
Sep 23, 2020·Proceedings of the National Academy of Sciences of the United States of America·Frederik Van den BroeckJean-Claude Dujardin
May 15, 2018·Molecular Phylogenetics and Evolution·Qian TangFrank E Rheindt

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