The effect of livestock grazing on densities of Brandt's voles and Daurian ground squirrels in Hulunber grassland, northern Inner Mongolia

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概要

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• Grazing effects on burrow densities of Brandt's voles Microtus brandti and Daurian ground squirrels Spermophilus [=Citellus] dauricus were investigated in Hulunber grassland, northern Inner Mongolia in June and July 1998. Burrow entrance diameter was used as a means of identifying the occupants; burrows with a shortest diameter of less than 45mm were regarded as belonging to Brandt's voles, while those of more than 45mm were considered to belong to Daurian ground squirrels. Burrow counts were made along 18 belt-transects of 4×50m in width, distributed in grazing, mown, and unused grasslands. The burrow density of voles was significantly correlated with vegetation cover and height, and soil hardness (regression analysis, p<0.05, n=18), whereas the burrow density of ground squirrels was not significantly correlated with either soil or vegetation conditions as altered by either grazing or mowing intensity. Burrow density of Brandt's vole was highest in grazed grasslands (71.6±47.93 (SD)/ha; n=10), lowest in unused grasslands (2.1±4.15 (SD)/ha; n=4), and intermediate in mown grasslands (17.5±15.61 (SD)/ha; n=4). Ground squirrel burrow density did not differ significantly among the three land use types (11.6±16.30/ha (SD); n=18).

• 野生生物保護学会の論文

著者

• Shi Kun

  Laboratory Of Wildlife Conservation Department Of Ecoregion Science Faculty Of Agriculture Tokyo Nok

• Shi Kun

  Wildlife Conservation Department Of Ecoregion Science Faculty Of Agriculture Tokyo University Of Agr

• Maruyama Naoki

  Laboratory Of Wildlife Conservation Department Of Ecoregion Science Faculty Of Agriculture Tokyo Nok

• Gao Zhongxin

  College Of Wildlife Resources Northwestern Forestry University

• Koganezawa Masaaki

  University Forest, Faculty of Agriculture, Utsunomiya University

• Maruyama Naoki

  Wildlife Conservation Department Of Ecoregion Science Faculty Of Agriculture Tokyo University Of Agr

• Onodera Kensuke

  Wildlife Conservation, Department of Ecoregion Science, Faculty of Agriculture, Tokyo Noko Universit

• Gao Zongxing

  College of Wildlife Resources, Northeast Forestry University

• Onodera Kensuke

  Wildlife Conservation Department Of Ecoregion Science Faculty Of Agriculture Tokyo Noko University

• Maruyama Naoki

  Wildlife Conservation Department Of Ecoregion Science Faculty Of Agriculture Tokyo Noko University

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