Distributions of the lesser Japanese mole (Mogera imaizumii) and the larger Japanese mole (Mogera wogura) were researched in the Kanazawa Plain of Ishikawa Prefecture, Japan, from 2001 to 2002, based on the different diameters of their tunnels. M. imaizumii and M. wogura were found at 63 and 65 different sites, respectively. M. imaizumii is excluded from most areas colonized by M. wogura, but the two species were found together in the Tedori Alluvial Fan. At this location, the tunnels of M. imaizumii were found in areas with harder soil at a depth of 0–20 cm, whereas those of M. wogura were found in areas with softer soil at the same depth. This is the first observed case of a mixed distribution of these two species of Japanese moles on a plain in a large geomorphological structure, such as an alluvial fan. This phenomenon may be attributable to the sediment characteristics in an alluvial fan, where various sediments with different diameters, from crude stone to fine clay, are distributed in a complex mosaic pattern.
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Vol. 36 • No. 3