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Probing evolutionary patterns in neotropical birds through DNA barcodes.

Kevin C R Kerr1, Darío A Lijtmaer, Ana S Barreira

  • 1Department of Integrative Biology, Biodiversity Institute of Ontario, University of Guelph, Guelph, Ontario, Canada. kkerr@uoguelph.ca

Plos One
|February 6, 2009
PubMed
Summary

DNA barcoding of Argentinian birds reveals deep genetic divergence, supporting complex Neotropical evolutionary patterns. This study highlights greater regional divergence opportunities fueling avian diversity, not just young species radiations.

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Area of Science:

  • Ornithology
  • Evolutionary Biology
  • Genetics

Background:

  • Neotropical avifauna exhibits unparalleled diversity, yet patterns of regional divergence remain poorly understood.
  • Limited genetic data has historically constrained critical examination of avian evolutionary history in South America.
  • This study addresses this gap by creating a DNA barcode library for Argentinian birds.

Purpose of the Study:

  • To establish a mitochondrial COI sequence library for Argentinian bird species.
  • To compare genetic diversity patterns between Neotropical (Argentinian) and Nearctic (North American) avifaunas.
  • To investigate the evolutionary processes underlying high avian diversity in the Neotropics.

Main Methods:

  • Sequencing of mitochondrial cytochrome c oxidase subunit I (COI) gene for DNA barcoding.
  • Analysis of genetic diversity and sequence divergence among 500 Argentinian bird species.
  • Comparative analysis of genetic patterns between South American and North American bird species.

Main Results:

  • The first major DNA barcode library for South American birds was established, encompassing 500 species.
  • Most Neotropical species displayed significant genetic divergence from nearest neighbors, indicating ancient diversification.
  • Patterns of regional divergence in the Neotropics are more complex than in North America, suggesting unique evolutionary dynamics.
  • Deep genetic splits were identified in at least 21 species, with variable lineage distribution.
  • Absence of shared polymorphisms, even in recently isolated species, suggests regular purging of ancestral mitochondrial DNA.

Conclusions:

  • DNA barcoding is a highly effective tool for species delimitation in birds, applicable globally.
  • Large, standardized genetic libraries provide crucial insights into avian evolutionary processes and diversification.
  • The findings support the hypothesis that extensive regional divergence, rather than solely recent radiations, drives Neotropical avian biodiversity.