Biogeography of the Andean metaltail hummingbirds: contrasting evolutionary histories of tree line and habitat-generalist clades
Aim: To assess geographical and temporal patterns of diversification in Metallura hummingbirds, particularly with respect to topographical barriers and climatic variation between different population. Location: Tropical Andes. Methods: We estimated a multilocus phylogeny for all nine species of Metallura and evaluated phylogeographical patterns within Metallura tyrianthina using mitochondrial DNA sequences from across its range (n = 192). We tested mechanisms of diversification using climatic classification of sampling sites, coalescent-based dating, lineages-through-time plots and dispersal-vicariance analysis. Results: Metallura consists of two main clades: (1) the tree line specialists in the M. aeneocauda superspecies; and (2) a habitat-generalist dade that includes M. tyrianthina and M. iracunda. Metallura phoebe was recovered as sister to the tree line clade in some analyses. In both clades, there was marked genetic structure across topographical barriers and almost no structure between climatically distinct regions in the absence of barriers. The tree line clade exhibited deeper divergences in the Central Andes than elsewhere, and a south-to-north history of diversification, whereas the habitat-generalist clade showed deeper divergences in the Northern Andes and a history of southward expansion. A pure-birth model explained the steady net rate of diversification of Metallura hummingbirds through the Pliocene and the Pleistocene. Main conclusions: Isolation across topographical barriers best explained the genetic structure in M. tyrianthina. The two Metallura clades expanded from opposite ends of the Andes, leading to asynchronous divergence across common topographical barriers. Cycles of expansion followed by isolation may explain the preponderance of idiosyncratic area relationships that are typical of Andean clades. Geoclimatic dynamism during the Pleistocene caused Metallura and other Andean bird clades to undergo radical range shifts, including dispersal across topographical barriers, that became key to their diversification..
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2015 |
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| Erschienen: |
2015 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:42 |
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| Enthalten in: |
Journal of Biogeography - 42(2015), 4, Seite 763-777 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Benham, Phred M. [VerfasserIn] |
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| PPN (Katalog-ID): |
JST129064386 |
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| 245 | 1 | 0 | |a Biogeography of the Andean metaltail hummingbirds: contrasting evolutionary histories of tree line and habitat-generalist clades |
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| 520 | |a Aim: To assess geographical and temporal patterns of diversification in Metallura hummingbirds, particularly with respect to topographical barriers and climatic variation between different population. Location: Tropical Andes. Methods: We estimated a multilocus phylogeny for all nine species of Metallura and evaluated phylogeographical patterns within Metallura tyrianthina using mitochondrial DNA sequences from across its range (n = 192). We tested mechanisms of diversification using climatic classification of sampling sites, coalescent-based dating, lineages-through-time plots and dispersal-vicariance analysis. Results: Metallura consists of two main clades: (1) the tree line specialists in the M. aeneocauda superspecies; and (2) a habitat-generalist dade that includes M. tyrianthina and M. iracunda. Metallura phoebe was recovered as sister to the tree line clade in some analyses. In both clades, there was marked genetic structure across topographical barriers and almost no structure between climatically distinct regions in the absence of barriers. The tree line clade exhibited deeper divergences in the Central Andes than elsewhere, and a south-to-north history of diversification, whereas the habitat-generalist clade showed deeper divergences in the Northern Andes and a history of southward expansion. A pure-birth model explained the steady net rate of diversification of Metallura hummingbirds through the Pliocene and the Pleistocene. Main conclusions: Isolation across topographical barriers best explained the genetic structure in M. tyrianthina. The two Metallura clades expanded from opposite ends of the Andes, leading to asynchronous divergence across common topographical barriers. Cycles of expansion followed by isolation may explain the preponderance of idiosyncratic area relationships that are typical of Andean clades. Geoclimatic dynamism during the Pleistocene caused Metallura and other Andean bird clades to undergo radical range shifts, including dispersal across topographical barriers, that became key to their diversification. | ||
| 540 | |a Copyright © 2015 John Wiley & Sons Ltd. | ||
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| 700 | 1 | |a Cuervo, Andrés M. |e verfasserin |4 aut | |
| 700 | 1 | |a McGuire, Jimmy A. |e verfasserin |4 aut | |
| 700 | 1 | |a Witt, Christopher C. |e verfasserin |4 aut | |
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