Intra- and Interspecific Variation in Activity Patterns of Intertidal Limpets

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  • IWASAKI Keiji
    Department of Zoology, Faculty of Science, Kyoto University

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Other Title
  • カサガイ類の活動パターンの種内・種間変異
  • カサガイ類の活動パターンの種内・種間変異〔英文〕
  • カサガイルイ ノ カツドウ パターン ノ シュナイ シュカン ヘンイ エイブン

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Intra- and interspecific variation in activity patterns of intertidal limpets was analysed focusing on the relationship between level of activity and height of their resting sites under several tidal conditions. At a study site in the upper intertidal zone where night emersion occurred, two species resting highter on the shore tended to be more active during the night emersion than two other species resting lower on the shore. In regard to all ten groups of six species at three study sites covering the upper to lower intertidal zones as a whole, level of activity during the daytime submersion was negatively correlated with height of their resting sites ; lower zone-dwelling limpets were more active than upward-dwelling limpets during the period. Among four groups of Cellana toreuma inhabiting the mid to lower shores, lower populations showed greater activity than upper populations during the day and night submersion. These results were obtained both at spring and neap tides, and causes of this variation are discussed in relation to vertical gradients in intensity of desiccation and predation.

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