Diets and Abundances of Three Sympatric Shrew Species in Northern Hokkaido

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Abstract

The diets and abundances of three sympatric shrew species (Sorex unguiculatus, S. gracillimus, and S. caecutiens), food resource conditions, and environmental characteristics were investigated in three habitat types (riparian forest, wind-shelter belt, and spruce forest), during seasons without snow-cover in northern Hokkaido, Japan. S. unguiculatus outnumbered S. gracillimus in both the riparian forest and wind-shelter belt, and vice versa in the spruce forest. S. caecutiens was rare in the study area. Abundances of S. unguiculatus and S. gracillimus seemed to be unrelated to those of their principal foods. The main prey of S. unguiculatus was earthworms, whereas S. gracillimus and S. caecutiens mainly consumed small terrestrial arthropods. S. unguiculatus tended to consume more earthworms in the spruce forest than in the other habitat types. The earthworm consumption appeared to directly reflect their availability per capita. Food consumption by S. gracillimus tended to be constant regardless of the habitat type.

The diets and abundances of three sympatric shrew species (<i>Sorex unguiculatus</i>, <i>S. gracillimus</i>, and <i>S. caecutiens</i>), food resource conditions, and environmental characteristics were investigated in three habitat types (riparian forest, wind-shelter belt, and spruce forest), during seasons without snow-cover in northern Hokkaido, Japan. <i>S. unguiculatus</i> outnumbered <i>S. gracillimus</i> in both the riparian forest and wind-shelter belt, and <i>vice versa</i> in the spruce forest. <i>S. caecutiens</i> was rare in the study area. Abundances of <i>S. unguiculatus</i> and <i>S. gracillimus</i> seemed to be unrelated to those of their principal foods. The main prey of <i>S. unguiculatus</i> was earthworms, whereas <i>S. gracillimus</i> and <i>S. caecutiens</i> mainly consumed small terrestrial arthropods. <i>S. unguiculatus</i> tended to consume more earthworms in the spruce forest than in the other habitat types. The earthworm consumption appeared to directly reflect their availability per capita. Food consumption by <i>S. gracillimus</i> tended to be constant regardless of the habitat type.<br>

Journal

  • Journal of the Mammalogical Society of Japan  

    Journal of the Mammalogical Society of Japan 20(1), 69-83, 1995-06-01 

    Mammalogical Society of Japan

References:  37

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Cited by:  3

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Codes

  • NII Article ID (NAID)
    10018939860
  • NII NACSIS-CAT ID (NCID)
    AA1092271X
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    09141855
  • NDL Article ID
    3630139
  • NDL Source Classification
    RA48(生態--動物)
  • NDL Source Classification
    ZR4(科学技術--生物学--動物)
  • NDL Call No.
    Z54-G149
  • Data Source
    CJP  CJPref  NDL  IR  J-STAGE 
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