Evolutionary differentiation in the neotropical montane region: Molecular phylogenetics and phylogeography of Buarremon brush-finches (Aves, Emberizinae)
Document Type
Article
Publication Date
9-2007
Publication Title
Molecular Phylogenetics and Evolution
Publisher
Elsevier
Volume
44
Issue
3
First page number:
993
Last page number:
1016
Abstract
Studies on Neotropical phylogeography have largely focused on lowland organisms. Because lowland and highland biotas have different histories and are likely affected by different processes influencing population differentiation, understanding Neotropical diversification requires detailed studies on montane taxa. We present the most comprehensive analysis of population differentiation conducted so far on a widespread group of Neotropical montane organisms, focusing on the evolutionary relationships and phylogeography of Buarremon brush-finches (Aves: Emberizidae) in montane areas from Mexico through Argentina. Sequences of mitochondrial and nuclear genes demonstrate that Buarremon is not monophyletic with respect to Arremon and Lysurus. Genetic structure revealed by mtDNA is strong in both B. brunneinucha and B. torquatus. Gene genealogies and nucleotide diversity indicate that B. brunneinucha originated in Mexico and later expanded to South America, where it followed one colonization route through the east, and one through the west of the continent. Differentiation among populations of B. torquatus was substantial, reaching 8% uncorrected sequence divergence within South America. Relationships among major lineages of B. torquatus were not fully resolved owing to rapid differentiation, but the occurrence of closely related taxa in distant locations suggests a complex history of diversification. Some Colombian populations of B. brunneinucha have affinities with populations from Venezuela and the East Andean slope of Ecuador and Peru, and others with those from the Pacific slope of Ecuador. Moreover, five divergent lineages of B. torquatus occur within Colombia, highlighting the importance of dense sampling in northwest South America for studies on diversification of widespread Neotropical lineages.
Keywords
Biogeography; Birds; Buarremon; Neotropics; Phylogeography
Controlled Subject
Biogeography; Molecular genetics; Phylogeography
Disciplines
Molecular Genetics | Ornithology | Population Biology
File Format
File Size
1152 KB
Language
English
Permissions
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Rights
IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/
Repository Citation
Cadena, C. D.,
Klicka, J.,
Ricklefs, R. E.
(2007).
Evolutionary differentiation in the neotropical montane region: Molecular phylogenetics and phylogeography of Buarremon brush-finches (Aves, Emberizinae).
Molecular Phylogenetics and Evolution, 44(3),
993-1016.
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