多摩川河原で採集されたハタネズミの胃内容物

概要

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Stomach contents of Microtus montebelli montebelli were studied based on 56 specimens trapped at the Tama river-bed, southern Tokyo suburbs. The contents were sorted into following food items: animals, green vegetations, undergroud roots or stems and storage starch. Number of stomachs containing each food item was given for two seasonal periods, summer (June to August) and winter (December to January) . The results obtained are as follows : Hairs of Microtus montelli found in many stomachs are estimated to be swallowed while grooming. No other animal material was found in the stomachs. The staple food was the green vegetations both in summer and winter. While in winter when green plants were scarce in the study areas, the number of stomachs containing green vegetations were less than in summer and stomachs containing underground roots or stems occurred more frequently. In winter, tissues of both monocotyledon and dycotyledon were present in the same number of stomachs and following plant species were recognized in the tissues : Veronica persica, Oxalis corniculata, Stellaria media, Rumex japonicus, Euonymus japonicus and unidentified spp. of Gramineae.
日本哺乳類学会の論文