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Genetics of Speciation

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Visually Sexing Loggerhead Shrike (Lanius Ludovicianus) Using Plumage Coloration and Pattern

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Published on: March 8, 2020

Sexual selection accelerates signal evolution during speciation in birds.

Nathalie Seddon¹, Carlos A Botero, Joseph A Tobias

¹Edward Grey Institute, University of Oxford, , South Parks Road, Oxford OX1 3PS, UK. nathalie.seddon@zoo.ox.ac.uk

Proceedings. Biological Sciences

|July 19, 2013

Summary

Sexual selection drives rapid evolutionary divergence in bird plumage, particularly in males, influencing speciation. This study highlights sexual selection

Keywords:

comparative analyses evolutionary rates plumage dichromatism sexual selection sister species speciation

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Area of Science:

Evolutionary Biology
Ornithology
Behavioral Ecology

Background:

Sexual selection is a proposed driver of animal diversification, but empirical evidence and underlying mechanisms remain debated.
Previous studies on sexual selection's role in speciation have yielded inconsistent results.

Purpose of the Study:

To investigate the influence of sexual selection on evolutionary change during recent speciation events in birds.
To identify specific traits and mechanisms through which sexual selection may drive diversification.

Main Methods:

A novel phylogenetic approach was employed to analyze 84 speciation events across 23 passerine bird families.
Phenotypic divergence was assessed in relation to estimated levels of sexual selection.

Main Results:

Elevated sexual selection correlates with faster phenotypic divergence in related bird lineages.
This effect is specific to male plumage traits involved in mate choice and species recognition.
No evidence was found for sexual selection driving divergence in female plumage or male traits for foraging/locomotion.

Conclusions:

Sexual selection, particularly female choice and male-male competition, is a dominant force promoting divergence during avian speciation.
These findings link sexual selection to the accelerated evolution of pre-mating reproductive isolation in birds.