Reference : Mismatch between shape changes and ecological shifts during the post-settlement growt...
Scientific journals : Article
Life sciences : Zoology
http://hdl.handle.net/2268/130299
Mismatch between shape changes and ecological shifts during the post-settlement growth of the surgeonfish, Acanthurus triostegus
English
Frederich, Bruno mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Morphologie fonctionnelle et évolutive >]
Colleye, Orphal mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Morphologie fonctionnelle et évolutive >]
Lepoint, Gilles mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
Lecchini, David [Université de Perpignan > CRIOBE, USR 3278 - CNRS/EPHE, Labex "CORAIL" > > >]
25-Apr-2012
Frontiers in Zoology
BioMed Central
9
8
Yes (verified by ORBi)
International
1742-9994
[en] Acanthuridae ; Allometry ; Diet ; Geometric morphometrics ; Habitat change ; Moorea Island ; Reef fishes ; Coral Reefs
[en] Background: Many coral reef fishes undergo habitat and diet shifts during ontogeny. However, studies focusing on the physiological and morphological adaptations that may prepare them for these transitions are relatively scarce. Here, we explored the body shape variation related to ontogenetic shifts in the ecology of the surgeonfish Acanthurus triostegus (Acanthuridae) from new settler to adult stages at Moorea Island (French Polynesia). Specifically, we tested the relationship between diet and habitat shifts and changes in overall body shape during the ontogeny of A. triostegus using a combination of geometric morphometric methods, stomach contents and stable isotope analysis.
Results: After reef settlement, stable isotope composition of carbon and nitrogen revealed a change from a zooplanktivorous to a benthic algae diet. The large amount of algae (> 75% of stomach contents) found in the digestive tract of small juveniles (25–30 mm SL) suggested the diet shift is rapid. The post-settlement growth of A. triostegus is highly allometric. The allometric shape changes mainly concern cephalic and pectoral regions. The head becomes shorter and more ventrally oriented during growth. Morphological changes are directly related to the diet shift given that a small mouth ventrally oriented is particularly suited for grazing activities at the adult stage. The pectoral fin is more anteriorely and vertically positioned and its basis is larger in adults than in juveniles. This shape variation had implications for swimming performance, manoeuvrability, turning ability and is related to habitat shift. Acanthurus triostegus achieves its main transformation of body shape to an adult-like form at size of 35–40 mm SL.
Conclusion: Most of the shape changes occurred after the reef colonization but before the transition between juvenile habitat (fringing reef) and adult habitat (barrier reef). A large amount of allometric variation was observed after diet shift from zooplankton to benthic algae. Diet shift could act as an environmental factor favouring or inducing morphological changes. On the other hand, the main shape changes have to be achieved before the recruitment to adult populations and start negotiating the biophysical challenges of locomotion and feeding in wave- and current-swept outer reef habitat.
Applied and Fundamental FISH Research Center - AFFISH-RC
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS ; ANR-06-JCJC-0012-01 ; Coral Reef Initiative in the South Pacific - C2A
Researchers ; Professionals ; Students ; General public
http://hdl.handle.net/2268/130299
10.1186/1742-9994-9-8

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