Reference : Ontogenetic shape changes in Pomacentridae (Teleostei, Perciformes) and their relatio...
Scientific journals : Article
Life sciences : Zoology
Ontogenetic shape changes in Pomacentridae (Teleostei, Perciformes) and their relationships with feeding strategies: a geometric morphometric approach
Frederich, Bruno mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Département des sciences et gestion de l'environnement >]
Adriaens, Dominique [> >]
Vandewalle, Pierre mailto [Université de Liège - ULiège > Département des sciences et gestion de l'environnement > Morphologie fonctionnelle et évolutive >]
Biological Journal of the Linnean Society
Blackwell Publishing
Yes (verified by ORBi)
United Kingdom
[en] Allometry ; damselfishes ; development ; feeding apparatus ; growth ; heterochrony ; ontogeny ; reef fishes ; skull
[en] The present study explores the shape changes of cranial structures directly involved in food capturing during growth after reef settlement in two species of Pomacentridae (Dascyllus aruanus and Pomacentrus pavo). Landmark-based geometric morphometrics were used to study allometric patterns and related shape changes in four skeletal units: neurocranium, suspensorium and opercle, mandible and premaxilla. At settlement, the larvae of both species have a relatively similar morphology, especially with respect to the mandible. Their shapes suggest a feeding mode defined as ram/suction-feeding. Ontogenetic shape changes show a shift to a suction feeding mode
of prey capture. The main transformations involved are an increase in height of the suspensorium and the opercle, an elevation of the supraoccipital crest, a relative shortening of the mandible, and a lengthening of the ascending process of the premaxilla. Shape changes of the mandible in the two studied species also reflect an increase of biting capacities. The high disparity between adult shape results from differences in the rate and in the length of ontogenetic trajectories, from divergence of the ontogenetic trajectories (neurocranium, mandible, and premaxilla) and parallel shifts of the trajectories in the size-shape space (suspensorium and opercle). In an evolutionary
context, allometric heterochronies during ontogeny of different skeletal unit of the head may be considered as a basis for the explanation of the diversity of damselfishes.
Laboratoire de Morphologie Fonctionnelle et Evolutive
Fonds National de la Recherche Scientifique of Belgium
Researchers ; Professionals ; Students

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