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

Details

Serval ID
serval:BIB_6A67B6F7B8D5
Type
Article: article from journal or magazin.
Collection
Publications
Title
Trait decoupling promotes evolutionary diversification of the trophic and acoustic system of damselfishes.
Journal
Proceedings of the Royal Society. B Biological Sciences
Author(s)
Frédérich B., Olivier D., Litsios G., Alfaro M.E., Parmentier E.
ISSN
1471-2954 (Electronic)
ISSN-L
0962-8452
Publication state
Published
Issued date
2014
Volume
281
Number
1789
Pages
20141047
Language
english
Abstract
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.
Keywords
constraint, coral reef fishes, morphological novelty, morphospace, sound production, trait evolution
Pubmed
Web of science
Open Access
Yes
Create date
02/07/2014 13:15
Last modification date
20/08/2019 15:25
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