Reference : Evolution of ontogenetic allometry shaping giant species: a case study from the damselfi...
Scientific journals : Article
Life sciences : Zoology
http://hdl.handle.net/2268/33563
Evolution of ontogenetic allometry shaping giant species: a case study from the damselfish genus Dascyllus (Pomacentridae)
English
Frederich, Bruno mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Département des sciences et gestion de l'environnement >]
Sheets, David [> >]
Jan-2010
Biological Journal of the Linnean Society
Blackwell Publishing
99
1
99-117
Yes
International
0024-4066
Oxford
United Kingdom
[en] coral reef fishes ; development ; geometric morphometrics ; giantism ; growth ; heterochrony ; shape ; size ; skull
[en] The evolution of body size, the paired phenomena of giantism and dwarfism, has long been studied by biologists and paleontologists. However, detailed investigations devoted to the study of the evolution of ontogenetic patterns shaping giant species are scarce. The damselfishes of the genus Dascyllus appear as an excellent model for such a study. Their well understood phylogeny reveals that large-bodied species have evolved in two different clades. Geometric morphometric methods were used to compare the ontogenetic trajectories of the neurocranium and the mandible in both small-bodied (Dascyllus aruanus and Dascyllus carneus; maximum size: 50–65 mm standard length) and giant (Dascyllus trimaculatus and Dascyllus flavicaudus; maximum size: 90–110 mm standard length) Dascyllus species. At their respective maximum body size, the neurocranium of the giant species is significantly shorter and have a higher supraoccipital crest relative to the small-bodied species, whereas mandible shape variation is more limited and is not related to the ‘giant’ trait. The hypothesis of ontogenetic scaling whereby the giant species evolved by extending the allometric trajectory of the small-bodied ones (i.e. hypermorphosis) is
rejected. Instead, the allometric trajectories vary among species by lateral transpositions. The rate of shape changes and the type of lateral transposition also differ according to the skeletal unit among Dascyllus species. Differences seen between the two giant species in the present study demonstrate that giant species may appear by varied alterations of the ancestor allometric pattern.
Applied and Fundamental FISH Research Center - AFFISH-RC
Communauté Française de Belgique (Concours des bourses de voyage 2007) ; Belgian National Fund for Scientific Research (FRS-FNRS) (FRFC contract no. 2.4.583.05)
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/33563

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