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Molecular phylogenetic relationship of Tetraodon pufferfish based on mitochondrial DNA analysis
Ist Teil von
Fisheries science, 2013-03, Vol.79 (2), p.243-250
Ort / Verlag
Japan: Springer Japan
Erscheinungsjahr
2013
Link zum Volltext
Quelle
SpringerLink (Online service)
Beschreibungen/Notizen
Pufferfishes belonging to the genus
Tetraodon
form one of the largest groups in the family Tetraodontidae. This group consists of more than 20 species distributed across freshwater, as well as brackish and coastal waters, of Africa and Southeast Asia. However, their phylogenetic and evolutionary relationships are still ambiguous. In the present study, mitochondrial genes encoding 16S rRNA and cytochrome
b
were sequenced for 17
Tetraodon
species collected from various areas mentioned above. Supermatrix analysis based on the complete sequences of the two genes from
Tetraodon
species was performed using a tree with 50 tetraodontid species (including 7
Tetraodon
species) as a backbone. The obtained phylogenetic tree classified
Tetraodon
species into three groups, correlating well with their habitats, such as Asian freshwater, Asian brackish water, and African freshwater. We also showed that salinity tolerance of Asian freshwater species
T. cochinchinensis
was apparently lower than that of Asian brackish water species
T. nigroviridis
, suggesting that the speciation of
Tetraodon
species in the Asian freshwater group was caused by the molecular evolution associated with osmotic regulation.