都市近郊の宅造地内の孤立林における野鼠類の生息状況

概要

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This study was aimed to examine surviving populations of field mice in small groves isolated by turning the land into housing lots. Study areas were selected on the hills around Mt. Takatori (139m), near Yokouka city. Here, new housing is rapidly progressing splitting original wooded hills into isolated groves. (Fig. 1) For one survey, 60 snap-traps were set through 3 nights, and this was repeated 7 times during Sept. Oct. and Nov. in 1973. (Table 2) At Oppama and Taura study areas of less than 10 hectare groves, no mice were collected. At those small isolated groves the mice population had apparently died out during winter, since judging by other field studies, small isolated population of Apodemus would not be able to survive the winter if the area is less than 7 hectare. Three times trappings of mice at Jimmuji showed that in this district most of Apodernus speciosus were living in damp places or swamps and were not evenly distributed but localized at certain places. By microscope analysis of stomach contents of A. speciosus many bacae and arthropods (river crabs and insects) were found, but there was no trace of acorn. (Table 3)
日本哺乳類学会の論文