The Rokkou Mountains were barren due to excessive human-use until the middle Meiji era
and were reforested since 1902 with the main purpose of flood control. The present mountains
are largely covered by Quercus serrata dominant forests and Pinus densiflora dominant forests.
And, as additiona lcommentary, continuous artifici aplrovisioning has been carried for wild boars
in several sites in southern slope of the mountains since 1948. For the present studies, we
selected 14 footpaths (3.7km in average and 52.2km in total )in an area extending from Mt. Maya
to the south-western part of Takarazuka city: about 14km E-W and 10 km N-S, and walked along
the paths detecting mammal traces in October 1998 for southern slope and in September 1999
for northern slope, respectively. When we encountered traces, we mapped the location and
collected the feces for later laboratory analysis. We found the traces of four mammal species'
presence: Japanese squirrels, weasel species, martens and wild boars, in the southern slope
neighboring high-populated urban area, and the traces of seven mammal species: the four species
mentioned above plus Kobe mole, Japanese hare, and Japanese fox additionally in the northern
slope. The trace of raccoon dog had never been encountered along the paths. Also, the western
part of the area neighboring farmland had higher biodiversity in mammal species than the
eastern part of the mountains. Frugivory of weasel species and marten, in which fecal samples
were larger than those of the others in sample size, was biased to Eurya japonica, Actinidia sp.,
and Akebia sp. The forest seem to succeed in lower biodiversity. This forests succession is
partly due to artificia ldisturbance through the provisioning for wild boars because of their
overpopulation.
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