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Phylogenetic relationships and natural hybridization in rabbitfishes (Teleostei: Siganidae) inferred from mitochondrial and nuclear DNA analyses
- Source :
- Molecular Phylogenetics and Evolution. 45:69-80
- Publication Year :
- 2007
- Publisher :
- Elsevier BV, 2007.
-
Abstract
- Phylogenetic relationships of rabbitfishes (the family Siganidae), ecologically important components as primary consumers in coral reef communities, were studied using mitochondrial cytochrome b gene and nuclear ITS1 (internal transcribed spacer 1) sequence analyses. The analyses of 19 out of 22 species known in the Western Pacific region revealed that siganids are genetically clustered into three major clades, which are characterized by some morphological and ecological traits. Between closely related species, such as Siganus guttatus-S. lineatus and S. virgatus-S. doliatus, and also between two morphs recognized in S. corallinus, small but discernible genetic differentiation was found, implying that the components of each pair are incipient species. On the other hand, between some species, such as S. fuscescens-S. canaliculatus and S. unimaculatus-S.vulpinus, individuals of the components of each pair were found to construct a genetic mosaic, suggesting that the components are genetic color morphs within a single biological species, respectively. Moreover, evidence from morphological characters, mtDNA, and nuclear DNA gave an inconsistent picture of identity and relationships for several individuals. They were regarded as hybrids or individuals with hybrid origin. Such instances were observed not only between closely related species, such as S. guttatus-S. lineatus, S. virgatus-S. doliatus, and two morphs (incipient species) in S. corallinus, respectively, but also between distantly related ones, such as S. corallinus-S. puellus. In fact, more than half of the species examined (11/20, when treating the two morphs in S. corallinus as independent species) were involved in hybridization. These suggest that hybridization is much more prevalent in marine fishes than previously assumed, and may have some relevance to their diversification.
- Subjects :
- Mitochondrial DNA
media_common.quotation_subject
Molecular Sequence Data
Oceania
Biology
DNA, Mitochondrial
Models, Biological
Evolution, Molecular
Sequence Homology, Nucleic Acid
Genetics
Animals
Internal transcribed spacer
Clade
Molecular Biology
Crosses, Genetic
Phylogeny
Ecology, Evolution, Behavior and Systematics
media_common
Hybrid
Cell Nucleus
Base Sequence
Phylogenetic tree
Chimera
Ecology
Sequence Analysis, DNA
Cytochromes b
Incipient speciation
Perciformes
Nuclear DNA
Speciation
Evolutionary biology
DNA, Intergenic
Subjects
Details
- ISSN :
- 10557903
- Volume :
- 45
- Database :
- OpenAIRE
- Journal :
- Molecular Phylogenetics and Evolution
- Accession number :
- edsair.doi.dedup.....92f0b66dae641a79df7674a97f3adf7e
- Full Text :
- https://doi.org/10.1016/j.ympev.2007.04.018