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Related Experiment Video

Updated: Mar 1, 2026

Visually Sexing Loggerhead Shrike Lanius Ludovicianus Using Plumage Coloration and Pattern
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SPECIATION IN NORTH AMERICAN CHICKADEES: I. PATTERNS OF mtDNA GENETIC DIVERGENCE.

Frank B Gill1, Alison M Mostrom1, Andrew L Mack2

  • 1The Academy of Natural Sciences, Philadelphia, PA, 19103, USA.

Evolution; International Journal of Organic Evolution
|June 2, 2017
PubMed
Summary

Mitochondrial DNA analysis of North American chickadees reveals low genetic diversity within populations. Widespread species show little differentiation due to postglacial expansion, while some populations exhibit distinct haplotypes, suggesting unique evolutionary histories.

Keywords:
BiogeographyParusQuaternarybirdschickadeesgenetic divergencehaplotype diversitymtDNAphylogenyphylogeographyspeciation

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Area of Science:

  • Avian genetics
  • Molecular evolution
  • Population genetics

Background:

  • North American chickadees (Parus, Subgenus Poecile) are a diverse group with complex population structures.
  • Understanding genetic divergence is crucial for avian conservation and evolutionary studies.

Purpose of the Study:

  • To investigate mitochondrial DNA (mtDNA) haplotype divergence within and between populations of six North American chickadee species.
  • To infer evolutionary relationships and population histories.

Main Methods:

  • Mitochondrial DNA sequencing and analysis of haplotype divergence.
  • Phylogenetic analyses of genetic data.

Main Results:

  • Low nucleotide diversity within populations was observed, typical for vertebrates.
  • Widespread northern species showed limited mtDNA differentiation, indicative of recent postglacial expansions.
  • Distinct mtDNA haplotypes were identified in Newfoundland and maritime populations, and a significant divergence was found in *P. carolinensis* populations.
  • Interspecific divergence suggests speciation occurred in the early Pleistocene.

Conclusions:

  • mtDNA data reveal complex population structures and evolutionary histories in North American chickadees.
  • Recent range expansions have homogenized mtDNA in some widespread species.
  • Phylogenetic analyses support two major clades and indicate *P. carolinensis* and *P. atricapillus* are not sister species.