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Article Dans Une Revue Comptes Rendus Biologies Année : 2007

Cytochrome b barcoding, molecular systematics, and geographic differentiation in rabbitfishes (Siganidae)

Résumé

The fish genus Siganus (Siganidae) is widely distributed in the coastal habitats of all the tropical Indo-Pacific, with 28 nominal species recognized so far, based on general morphology and coloration patterns. A mitochondrial phylogeny of 16 Siganidae species, based on the partial nucleotide sequences of the cytochome b gene, was produced. Individual haplotypes of given nominal species generally clustered at the extremity of long branches, thus validating the current taxonomy. However, S. lineatus haplotypes formed a paraphyletic group including S. guttatus, while S. fuscescens haplotypes were apparently splitted in two groups, calling for further investigation. S. woodlandi and S. argenteus formed a monophyletic group, as expected from their close morphological relatedness, although they were separated by a substantial, 14.5%-16.3% nucleotide distance. Among 8 species sampled from different locations across the Indo-West Pacific, S. argenteus and S. spinus showed the lowest degree of geographic differentiation, a result that correlated well with their extended pelagic larval stage. Fixation index estimates were high in all 6 other species tested (S. doliatus, S. fuscescens, S. lineatus, S. puellus, S. punctatus, S. vulpinus). The cytochrome b gene fragment chosen here proved useful as a barcode in Siganidae.
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Dates et versions

hal-00553678 , version 1 (08-01-2011)

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Sarah Lemer, D. Aurelle, Laurent Vigliola, Jean-Dominique Durand, Philippe Borsa. Cytochrome b barcoding, molecular systematics, and geographic differentiation in rabbitfishes (Siganidae). Comptes Rendus Biologies, 2007, 330, pp.86-94. ⟨10.1016/j.crvi.2006.09.002⟩. ⟨hal-00553678⟩
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