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The incomplete history of mitochondrial lineages between two rockfishes, Sebastes longispinis and Sebastes hubbsi (Scorpaeniformes: Scorpaenidae)
Author(s) -
Kai Y.,
Park K.D.,
Nakabo T.
Publication year - 2012
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2012.03326.x
Subject(s) - biology , sebastes , mitochondrial dna , mtdna control region , amplified fragment length polymorphism , evolutionary biology , genetic divergence , scorpaenidae , zoology , haplotype , fishery , genetic diversity , genetics , gene , population , fish <actinopterygii> , sociology , demography , genotype
The genetic divergence between two closely related rockfishes, Sebastes longispinis and Sebastes hubbsi , was inferred from both mitochondrial DNA (mtDNA) sequence variations and amplified fragment length polymorphism (AFLP) markers. The two species were placed into two distinct clades in a neighbour‐joining tree based on the AFLP data, clearly indicating that they represented separate species. Although this evidence, together with a previous morphological study, revealed clear differences between the two species, no obvious clustering of haplotypes by species was detected in the minimum spanning network inferred from sequence variations in the mtDNA control region ( c . 500 base pairs). In fact, the significant Φ ST estimates indicated only a restriction of gene flow between the two species. Uncorrected pairwise sequence differences in mtDNA between two species were small (1·8% at maximum, on the lower end of the range of control region divergence between previously studied sister species pairs), suggesting their speciation event as having been fairly recent. The incongruent results of AFLP and mtDNA phylogenies suggested incomplete lineage sorting and introgression of mtDNA in the course of the evolution of the two species. Differences in their main distributional ranges and the small level of sequence divergence in mtDNA suggests that speciation and dispersal may have been associated with glacio‐eustatic sea level fluctuations between the Japanese Archipelago and the Korean Peninsula during the past 0·4 million years.