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SPECIATION AND FEATHER ORNAMENTATION IN BIRDS.
1Laboratoire d'Ecologie, CNRS URA 258, Université Pierre et Marie Curie, Bât. A, 7ème étage, 7 quai St. Bernard, Case 237, F-75252 Paris Cedex 5, France.
Summary
Sexual selection, driven by ornate traits, appears to promote bird speciation and the formation of new subspecies. More ornamented species are found in diverse genera with intense sexual selection.
Area of Science:
- Evolutionary Biology
- Ornithology
- Speciation Research
Background:
- The link between sexual selection and speciation is a key question in evolutionary biology.
- Feather ornaments in birds are a prominent example of sexually selected traits.
- Empirical evidence testing the hypothesis that sexual selection drives speciation is limited.
Purpose of the Study:
- To investigate the hypothesis that sexual selection promotes speciation in birds.
- To determine if the evolution of feather ornaments is associated with increased species diversity and subspecies formation.
- To explore the role of mating systems in the relationship between sexual selection and speciation.
Main Methods:
- Identified 70 independent evolutionary events of feather ornaments in bird species.
- Compared species richness and subspecies numbers between ornamented and non-ornamented species and genera.
- Utilized regression analyses to assess the relationship between ornament evolution, species richness, and mating systems.
- Controlled for geographic range when comparing subspecies numbers.
Main Results:
- Genera with ornamented species exhibited a higher proportion of ornamented species compared to non-ornamented genera.
- Ornamented genera with more than the expected number of ornamented species were more speciose than their non-ornamented counterparts.
- Species with ornaments showed a greater number of subspecies than non-ornamented species, even after accounting for geographic range.
- A higher number of ornamented species was associated with mating systems characterized by skewed male mating success, indicating more intense sexual selection.
Conclusions:
- Sexual selection, evidenced by feather ornaments, is positively associated with increased speciation rates in birds.
- The evolution of ornaments may drive the formation of new subspecies, contributing to overall biodiversity.
- Intense sexual selection, particularly with skewed mating systems, appears to be a significant factor in ornament evolution and subsequent diversification.
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