Functional coupling constrains craniofacial diversification in Lake Tanganyika cichlids
Number of Authors: 3
2015 (English)In: Biology Letters, ISSN 1744-9561, E-ISSN 1744-957X, Vol. 11, no 5, 20141053Article in journal (Refereed) Published
Functional coupling, where a singlemorphological trait performs multiple functions, is a universal feature of organismal design. Theory suggests that functional coupling may constrain the rate of phenotypic evolution, yet empirical tests of this hypothesis are rare. In fish, the evolutionary transition from guarding the eggs on a sandy/rocky substrate (i.e. substrate guarding) to mouthbrooding introduces a novel function to the craniofacial system and offers an ideal opportunity to test the functional coupling hypothesis. Using a combination of geometric morphometrics and a recently developed phylogenetic comparative method, we found that head morphology evolution was 43% faster in substrate guarding species than in mouthbrooding species. Furthermore, for species in which females were solely responsible for mouthbrooding the males had a higher rate of head morphology evolution than in those with biparental mouthbrooding. Our results support the hypothesis that adaptations resulting in functional coupling constrain phenotypic evolution.
Place, publisher, year, edition, pages
2015. Vol. 11, no 5, 20141053
functional coupling, constraints, phylogenetic comparative analysis, geometric morphometrics, rate of evolution
IdentifiersURN: urn:nbn:se:su:diva-119256DOI: 10.1098/rsbl.2014.1053ISI: 000357684200003OAI: oai:DiVA.org:su-119256DiVA: diva2:845904