This study aimed to identify potential factors responsible for geographically structured
morphological variation within the widespread Australian frogs Limnodynastes tasmaniensis …

Geographic variation and interspecific differentiation in body size (body length) were
analyzed for 15 species of the carabid subgenus Ohomopterus (genus Carabus; …

Several previous studies have reported geographic variation and/or latitudinal clines of
morphological sexual characteristics, but there are few studies that consider reproductive …

The Japanese Islands have been largely isolated from the East Asian mainland since the
Early Pleistocene, allowing the diversification of endemic lineages. Here, we explore …

Sexual selection can facilitate divergent evolution of traits related to mating and
consequently promote speciation. Theoretically, independent operation of sexual selection …

Seeds of the Japanese walnut, Juglans ailanthifolia, are usually scatter-hoarded by two
rodent species, the Japanese squirrel Sciurus lis and the field mouse Apodemus speciosus …

Japanese camellia (Camellia japonica) and its seed predator, the camellia weevil (Curculio
camelliae), provide a notable example of a geographic mosaic of coevolution. In the species …

A stout–slender dimorphism in body shape is observed among carabid beetles of the
subtribe Carabina, which feed on land snails. We hypothesized that this dimorphism has …

Seven species in three species groups (Decim, Cassini and Decula) of periodical cicadas
(Magicicada) occupy a wide latitudinal range in the eastern United States. To clarify how …

Although the importance of gene flow in the geographic structuring of host–parasite
interactions has been well discussed, little is known about how dispersal drives the spatial …