Trait decoupling promotes evolutionary diversification of the trophic and acoustic system of damselfishes.

Détails

ID Serval
serval:BIB_6A67B6F7B8D5
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Titre
Trait decoupling promotes evolutionary diversification of the trophic and acoustic system of damselfishes.
Périodique
Proceedings of the Royal Society. B Biological Sciences
Auteur(s)
Frédérich B., Olivier D., Litsios G., Alfaro M.E., Parmentier E.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452
Statut éditorial
Publié
Date de publication
2014
Volume
281
Numéro
1789
Pages
20141047
Langue
anglais
Résumé
Trait decoupling, wherein evolutionary release of constraints permits specialization of formerly integrated structures, represents a major conceptual framework for interpreting patterns of organismal diversity. However, few empirical tests of this hypothesis exist. A central prediction, that the tempo of morphological evolution and ecological diversification should increase following decoupling events, remains inadequately tested. In damselfishes (Pomacentridae), a ceratomandibular ligament links the hyoid bar and lower jaws, coupling two main morphofunctional units directly involved in both feeding and sound production. Here, we test the decoupling hypothesis by examining the evolutionary consequences of the loss of the ceratomandibular ligament in multiple damselfish lineages. As predicted, we find that rates of morphological evolution of trophic structures increased following the loss of the ligament. However, this increase in evolutionary rate is not associated with an increase in trophic breadth, but rather with morphofunctional specialization for the capture of zooplanktonic prey. Lineages lacking the ceratomandibular ligament also shows different acoustic signals (i.e. higher variation of pulse periods) from others, resulting in an increase of the acoustic diversity across the family. Our results support the idea that trait decoupling can increase morphological and behavioural diversity through increased specialization rather than the generation of novel ecotypes.
Mots-clé
constraint, coral reef fishes, morphological novelty, morphospace, sound production, trait evolution
Pubmed
Web of science
Open Access
Oui
Création de la notice
02/07/2014 12:15
Dernière modification de la notice
20/08/2019 14:25
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