Terrestrial molluscan fauna at limestone and non-limestone area in Nakatonbetsu-cho (northern Hokkaido, Japan)

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  • 中頓別町（北海道枝幸郡）の石灰岩地・非石灰岩地における陸産貝類相
  • ナカトンベツマチ(ホッカイドウ エサシグン)ノ セッカイガンチ ・ ヒセッカイガンチ ニ オケル リクサン カイルイソウ

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Description

High species richness and population density of land snails are generally associated with limestone outcrops. We quantitatively investigated the land snail fauna of Nakatonbetsu-cho (northern Hokkaido, Japan) in both limestone and non-limestone areas. In total, 567 individuals of land snails were collected within two quadrats (1 m × 1 m) at three sites (6 m2). The total number of species and the species density (species / m2) were the highest at one of two limestone sites (Site “Oyakoiwa”), and the lowest at a non-limestone site. In addition, three species of land snails, Carychium pessimum Pilsbry, 1902, Retinella radiatula radiata (Pilsbry & Hirase, 1904) and Columella edentula (Draparnaud, 1805), were detected only at limestone areas in this study. Unexpectedly, the lowest density of individuals was recorded at the second limestone site (Site“ Daisando”). Therefore, it was difficult to conclude whether the‘ limestone association’ rule is applicable to this study or not. We also recorded the northernmost distribution of Trochochlamys borealis (Pilsbry, 1901), this is approximately 200 km north from the previous northernmost distribution site.

Journal

  • Edaphologia

    Edaphologia 101 (0), 1-6, 2017

    The Japanese Society of Soil Zoology

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