title: Mutation is the Main Driving Force in the Diversification of the Vibrio splendidus Clade.
abstract: The Vibrio splendidus clade is the biggest in Vibrionales composed of 11 described species (25). Diversification of these species may have occurred 260 million years ago. The main driving forces of speciation in this clade have never been studied. Population biological parameters (population base recombination rate (ρ), population base mutation rate (θ), and index of association (Ia)) were determined among 16 strains of 9 defined species in the Splendidus cluster. A comparison of individual gene phylogeny indicated significant incongruence in tree topology, which suggests the occurrence of recombination between species. Homologous recombination between species was detected at four loci. However, the mutation rate θ was higher than the recombination rate ρ, suggesting that mutation is the main driving force in the diversification of V. splendidus-related species.
authors.affiliation: Laboratory of Microbiology, Faculty of Fisheries Sciences, Hokkaido University.
authors.forename: Tomoo
authors.initials: T
authors.lastname: Sawabe
authors.forename: Shinichi
authors.initials: S
authors.lastname: Koizumi
authors.forename: Youhei
authors.initials: Y
authors.lastname: Fukui
authors.forename: Satoshi
authors.initials: S
authors.lastname: Nakagawa
authors.forename: Elena P
authors.initials: EP
authors.lastname: Ivanova
authors.forename: Kumiko
authors.initials: K
authors.lastname: Kita-Tsukamoto
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Kogure
authors.forename: Fabiano L
authors.initials: FL
authors.lastname: Thompson