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What's missing from avian global diversification analyses?

Sushma Reddy1

  • 1Biology Department, Loyola University Chicago, Chicago, IL 60660, USA.

Molecular Phylogenetics and Evolution
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PubMed
Summary
This summary is machine-generated.

Bird evolutionary studies reveal significant geographic and taxonomic biases in genetic data. Tropical and Eastern regions, along with smaller-ranged species, are notably underrepresented, impacting global diversity analyses.

Keywords:
BiodiversityBirdsDNA sequencesDiversity patternsSampling biasTaxonomy

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Area of Science:

  • Ornithology
  • Evolutionary Biology
  • Bioinformatics

Background:

  • Molecular phylogenetic studies have advanced understanding of avian evolutionary history.
  • Global avian diversity patterns are increasingly analyzed using accumulated genetic data.
  • Uneven distribution of genetic data across regions and taxa poses challenges for meta-analyses.

Purpose of the Study:

  • To assess genetic data availability for biases in geographic and taxonomic sampling of birds.
  • To understand the impact of sampling variation on interpretations of global avian diversity patterns.
  • To identify understudied regions critical for future systematic analyses.

Main Methods:

  • Analysis of genetic data availability across different geographic regions (latitude, hemispheres).
  • Examination of taxonomic sampling disparities, particularly concerning range size.
  • Identification of sampling biases in relation to global diversity patterns.

Main Results:

  • Significant sampling disparities identified, geographically linked to latitude (temperate vs. tropical) and hemispheres (East vs. West).
  • Tropical regions, despite high species diversity, are substantially less studied.
  • Eastern regions (Old World Tropics, Australasia) and species with smaller ranges are disproportionately undersampled.

Conclusions:

  • Differential genetic sampling significantly impacts global diversity comparisons and interpretations of diversification rates.
  • Current understanding of latitudinal and hemispheric diversity gradients may be skewed.
  • Urgent need for modern systematic analyses in understudied tropical and Eastern regions to refine avian diversity insights.