アシハラガニおよびハマガニにおける巣穴外活動の季節変化と日周変化 Seasonal and Diel Activity Patterns of Two Burrowing Mud Crabs, Helice tridens and Chasmagnathus convexus (Crustacea : Decapoda : Varunidae)

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Helice tridens and Chasmagnathus convexus are grapsid crabs living in tidal flats . Both species construct burrows in the upper intertidal and supratidal zones, although they use also waterside areas in lower tidal zones during low tide. In this study, temporal variations in above-ground density and food items of the two species in different habitats (i.e., burrow areas and waterside areas) were investigated in the Shigenobu and Awai River estuaries of Ehime Prefecture, southwestern Japan, to examine the crabs' seasonal and diel activity patterns in relation to their food habits . Monthly investigations showed that above-ground densities of both species increased from spring and peaked in summer, and the densities were positively correlated with underground temperature. Diel activity patterns differed between the two species. Chasmagnathus convexus tended to be nocturnally active in both burrow and waterside areas . On the other hand, H. tridens exhibited high diurnal activity in their burrow areas during cool seasons (March, October), while at other times they tended to be active nocturnally in both the burrow and waterside areas . Helice tridens consumed various food items such as surface sediment, macroalgae, reeds, and macrozoobenthos. These crabs mainly consumed surface sediment in burrow areas, whereas they frequently consumed macroalgae in waterside areas, where their foraging activity was greater. Food and habitat use of C. convexus differed from those of H . tridens; they primarily consumed reeds in burrow areas and rarely foraged in waterside areas. Overall results suggest that the differences in diel activity pattern between the two species are related to their different food habits and spatial variation in food availability.

収録刊行物

  • 日本ベントス学会誌 = Japanese journal of benthology  

    日本ベントス学会誌 = Japanese journal of benthology 61, 26-39, 2006-07-28 

    JAPANESE ASSOCIATION OF BENTHOLOGY

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各種コード

  • NII論文ID(NAID)
    10018212921
  • NII書誌ID(NCID)
    AA11376003
  • 本文言語コード
    JPN
  • 資料種別
    ART
  • ISSN
    1345112X
  • NDL 記事登録ID
    8068456
  • NDL 雑誌分類
    ZR1(科学技術--生物学)
  • NDL 請求記号
    Z74-B668
  • データ提供元
    CJP書誌  CJP引用  NDL  J-STAGE 
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