Geographic Variation in the Body Size of Some Japanese Leptocarabus Species (Coleoptera, Carabidae) : The "Toppled-Domino Pattern" in Species along a Geographic Cline

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We analyzed the geographic pattern of body size variation in five species belonging to the subgenera Leptocarabus and Adelocarabus in the genus Leptocarabus (Coleoptera, Carabidae) in the Japanese Archipelago. Except for L. (L.) hiurai in Shikoku, these species are parapatric or partially sympatric with each other. In all four species, the northeastern populations had larger bodies than the southwestern populations, while in any two parapatric species the southwestern species had larger bodies than the northeastern species. We called this type of geographic variation the "toppled-domino pattern". Within each species, body size was positively correlated with the annual mean temperature of the locality (the converse of Bergmann's rule). The toppled-domino pattern resulted from (1) interspecific differences in the altitudinal range at the boundary zone, where southwestern species occurred at lower altitudes than northeastern species, and (2) intraspecific regional differences in body size, in which northeastern populations have larger bodies than southwestern populations under the same temperature conditions. In L. (L.) procerulus and L. (A.) arboreus from Honshu, the interspecific difference in mean body size at sympatric sites was greater in cooler habitats. This trend was more evident in central Honshu, where there are alpine zones, than in northern Honshu, where there are no alpine zones. We hypothesize that the observed geographic patterns of intra- and interspecific body size variation resulted from (1) climatic adaptation during colonization and range shift by Leptocarabus through the glacial and inter-glacial periods, and (2) the effects on body size evolution of interspecific interactions in a contact zone.

収録刊行物

  • Entomological science

    Entomological science 3(2), 309-320, 2000-06-25

    Entomological Society of Japan

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各種コード

  • NII論文ID(NAID)
    110003374671
  • NII書誌ID(NCID)
    AA11217633
  • 本文言語コード
    ENG
  • 資料種別
    Journal Article
  • ISSN
    13438786
  • NDL 記事登録ID
    5470873
  • NDL 雑誌分類
    ZR4(科学技術--生物学--動物)
  • NDL 請求記号
    Z54-J320
  • データ提供元
    CJP書誌  CJP引用  NDL  NII-ELS  IR 
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