Settling down of seasonal migrants promotes bird diversification

Détails

ID Serval
serval:BIB_E1A91CAECFE7
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Settling down of seasonal migrants promotes bird diversification
Périodique
Proceedings of the Royal Society B: Biological Sciences
Auteur(s)
Rolland J., Jiguet F., Jonsson K.A., Condamine F.L., Morlon H.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452 (Print)
Statut éditorial
Publié
Date de publication
2014
Volume
281
Numéro
1784
Pages
20140473-20140473
Langue
anglais
Résumé
How seasonal migration originated and impacted diversification in birds remains largely unknown. Although migratory behaviour is likely to affect bird diversification, previous studies have not detected any effect. Here, we infer ancestral migratory behaviour and the effect of seasonal migration on speciation and extinction dynamics using a complete bird tree of life. Our analyses infer that sedentary behaviour is ancestral, and that migratory behaviour evolved independently multiple times during the evolutionary history of birds. Speciation of a sedentary species into two sedentary daughter species is more frequent than speciation of a migratory species into two migratory daughter species. However, migratory species often diversify by generating a sedentary daughter species in addition to the ancestral migratory one. This leads to an overall higher migratory speciation rate. Migratory species also experience lower extinction rates. Hence, although migratory species represent a minority (18.5%) of all extant birds, they have a higher net diversification rate than sedentary species. These results suggest that the evolution of seasonal migration in birds has facilitated diversification through the divergence of migratory subpopulations that become sedentary, and illustrate asymmetrical diversification as a mechanism by which diversification rates are decoupled from species richness.
Mots-clé
behavioural evolution, extinction rate, speciation rate, ancestral character reconstruction
Pubmed
Web of science
Open Access
Oui
Création de la notice
08/09/2015 17:37
Dernière modification de la notice
09/05/2019 2:28
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