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Phylogenetic Position of the Japanese River Otter Lutra nippon Inferred from the Nucleotide Sequence of 224 bp of the Mitochondrial Cytochrome b Gene
The phylogenetic analysis using the 224 bp sequences of Lutra nippon, Lutra lutra (Latvia), Lutralutra (China), Aonyx cinerea (Asian small-clawed otter), Mustela sibirica and Mustela itatsi (weasels) supports the recent morphological study that the Japanese river otter is not a subspecies of Luba lutra, but a distinct species. Expand
Impacts of invasive crayfish (Pacifastacus leniusculus) on endangered freshwater pearl mussels (Margaritifera laevis and M. togakushiensis) in Japan
This study shows that the presence of invasive crayfish reduces freshwater pearl mussel populations by damaging the shell margins and/or killing the mussels. Expand
Nesting habitat use and partitioning of three sympatric ninespine sticklebacks (genus Pungitius): implications for reproductive isolation
It is suggested that habitat isolation through physical factors functions as an important mechanism of reproductive isolation between the brackish-water type and the other two sticklebacks. Expand
New Record of the Freshwater Pearl Mussel Margaritifera togakushiensis from Northern Sakhalin, the Russian Far East
This paper is the first report of the freshwater mussel Margaritifera togakushiensis from northern Sakhalin. Species identification was performed based on shell characteristics. Twenty six deadExpand
Phylogeography of the eight-barbel loach Lefua nikkonis (Cypriniformes: Nemacheilidae): how important were straits in northern Japan as biogeographical barriers?
Mitochondrial DNA haplotype and phylogenetic analyses of Lefua nikkonis revealed that the species is genetically structured within its geographic range, but that two major haplotypes are widely distributed across the Ishikari Lowland of Hokkaido Island as well as across the Tsugaru Strait between HokKaido and Honshu Islands, two well-known biogeographical boundaries of northern Japan. Expand
No reduction of hatching rates among F1 hybrids of naturally hybridizing three Far Eastern daces, genus Tribolodon (Cypriniformes, Cyprinidae)
Although crosses involving female rosyface dace were not available, hatching success was high among all combinations of hybrids and comparable to pure crosses, implying ecological or genetic isolation mechanisms maintaining each species in later life stages. Expand
Assortative mating and divergent male courtship behaviours between two cryptic species of nine-spined sticklebacks (genus Pungitius)
This study demonstrates assortative mating and divergent courtship behaviours between two cryptic species of nine-spined sticklebacks using no-choice mate trials and kinematic analyses, highlighting the importance of prezygotic reproductive isolation in these species. Expand
Genome-wide patterns of divergence and introgression after secondary contact between Pungitius sticklebacks
This sympatric pair provides new avenues to investigate the late stages of the stickleback speciation continuum, and detects on-going gene flow and signatures of introgression at the later stages of speciation. Expand
Morphologies and population genetic structures of the eight-barbel loach of the genus Lefua on southern Sakhalin
Coldwater, primary freshwater, fish such as the eight-barbel loach, Lefua nikkonis, are thought to have colonised Hokkaido from the continental Far East via Sakhalin Island during the LateExpand
The Far East great salmon