Genetic distances among fishes of the genus Siganus (Siganidae) from the Western Pacific Ocean

Lacson, J. M.; Nelson, Steven G.

doi:10.1007/bf00350008

Cited by 9 publications

(10 citation statements)

References 8 publications

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“…The present results do not support the phylogenetic separation of Siganidae species with tubular snout, heretofore grouped under subgenus Lo (Seale, 1906), versus the other species (subgenus Siganus), thus confirming Lacson and Nelson's (1993) preliminary conclusions from allozymes. S. (Lo) unimaculatus and S. (Lo) vulpinus branched within a subclade of Clade I, as sister-species to S. puellus and S. punctatus, both with slightly elongate snout and placed under subgenus Siganus.…”

Section: Discussioncontrasting

confidence: 89%

“…The present results distinguished three major clades in Siganidae, which had not been identified earlier (Lacson and Nelson, 1993;Lemer et al, 2007). The early separation between deep-bodied and fusiform species indicates that general body shape has a strong phylogenetic component in Siganidae.…”

Section: Discussionmentioning

confidence: 43%

“…An allozyme study conducted on ten Siganus spp. species allowed phylogenetic inference based on allozyme distances (Lacson and Nelson, 1993). The authors provisionally concluded that a major dichotomy separated deep-bodied and shallow-bodied Siganus spp.…”

Section: Introductionmentioning

confidence: 99%

“…Instead, S. vulpinus paired with S. punctatus (Fig. 1), a result that was deemed "unpredicted" by Lacson and Nelson (1993). No test of robustness of the allozyme tree was, nor can be performed from the data that were then published, hence it is not clear how much reliable its topology was.…”

Section: Introductionmentioning

confidence: 99%

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Patterns of lineage diversification in rabbitfishes

Borsa

Lemer

Aurelle

2007

Molecular Phylogenetics and Evolution

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Fishes of the tropical Indo-Pacific family Siganidae comprise 28 species, characterized by their body proportions and their colour patterns. A mitochondrial phylogeny of 20 Siganidae species was produced to infer their evolutionary history. Three distinct, major clades were found, that also correspond to the early radiation of the family into three major ecological types: fusiform species that also live in schools on the inshore reef flats (S. canaliculatus, S. fuscescens, S. luridus, S. rivulatus, S. spinus, S. sutor); deep-bodied species including brightly coloured ones whose adults live in pairs on the reef front (S. corallinus, S. doliatus, S. puellus, S. punctatus, S. unimaculatus, S. virgatus, S. vulpinus), and species that live in small schools in mangroves, estuaries and estuarine lakes (S. guttatus, S. javus, S. lineatus, S. randalli, S. vermiculatus); and a third clade including a cosmopolitan species, S. argenteus, the only species of the family known to possess a pelagic, prejuvenile stage and S. woodlandi, a recently described species from New Caledonia and morphologically close to S. argenteus. The partition of the genus into two sub-genera, Lo (erected for S. unimaculatus, S. vulpinus and three related species possessing a tubular snout) and Siganus (all the other species), had no phylogenetic rationale. The present results indicate that the tubular snout, which apparently results from ecological specialization, is a recent acquisition within the deep-body clade. The Western Indian Ocean endemic S. sutor appeared as the sister-species of the Red Sea endemic S. rivulatus within a well-supported subclade that also included S. canaliculatus and S. fuscescens. S. spinus did not appear as sister-species to S. luridus. S. lineatus haplotypes formed a paraphyletic group with S. guttatus, and an early isolation of Maldives S. lineatus was suggested. Unexpectedly, S. randalli did not appear as the sister-species of S. vermiculatus, but its haplotypes instead were embedded within the West Pacific S. lineatus haplogroup, suggesting recent introgression. Among currently-recognized sister-species with parapatric distribution, S. doliatus and S. virgatus haplotypes formed a single, unresolved haplogroup, as did S. unimaculatus and S. vulpinus. The occurrence of two distinct clades within S. fuscescens was confirmed.

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Section: Discussioncontrasting

confidence: 89%

Section: Discussionmentioning

confidence: 43%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Patterns of lineage diversification in rabbitfishes

Borsa

Lemer

Aurelle

2007

Molecular Phylogenetics and Evolution

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“…Additional analyses of species boundaries not cited by these authors include studies of Myliobatis (Levy & Conceição, 1989), Siganus (Lacson & Nelson, 1993), Naso (Dayton et al, 1994), Pleuronichthys (Watanabe et al, 1994), Osmerus (Taylor & Dodson, 1994), several damselfish genera (Lacson, 1994;Lacson & Clark, 1995;Lessios et al, 1995), Lutjanus (Lee & Cheng, 1996), Trematomus (Bernardi & Goswami, 1997), Cyclothone (Miya & Nishida, 1997), Mugil (Rossi et al, 1998), andChaetodon (McMillan et al, 1999).…”

Section: Fishmentioning

confidence: 99%

Molecular genetic analyses of species boundaries in the sea

2000

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The tools of molecular genetics have enormous potential for clarifying the nature and age of species boundaries in marine organisms. Below I summarize the genetic implications of various species concepts, and review the results of recent molecular genetic analyses of species boundaries in marine microbes, plants, invertebrates and vertebrates. Excessive lumping, rather than excessive splitting, characterizes the current systematic situation in many groups. Morphologically similar species are often quite distinct genetically, suggesting that conservative systematic traditions or morphological stasis may be involved. Some reproductively isolated taxa exhibit only small levels of genetic differentiation, however. In these cases, large population sizes, slow rates of molecular evolution, and relatively recent origins may contribute to the difficulty in finding fixed genetic markers associated with barriers to gene exchange. The extent to which hybridization blurs species boundaries of marine organisms remains a subject of real disagreement in some groups (e.g. corals). The ages of recently diverged species are largely unknown; many appear to be older than 3 million years, but snails and fishes provide several examples of more recent divergences. Increasingly sophisticated genetic analyses make it easier to distinguish allopatric taxa, but criteria for recognition at the species level are highly inconsistent across studies. Future molecular genetic analyses should help to resolve many of these issues, particularly if coupled with other biological and paleontological approaches.

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