ヒナハグモの社会行動

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  • Social behavior of <i>Dictyna foliicola</i> Bös. et STR. (Araneae: Dictynidae)
  • ヒナハグモ ノ シャカイ コウドウ
  • Social behavior of Dictyna foliicola Bös. et STR. (Araneae: Dictynidae)

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The social behavior of D. foliicola, a common spider in Japan, was investigated. D. foliicola was observed not only on plant leaves, but also in the artificial environments such as window frames and roadside guardrails.<br>The spiders inhabited bathroom window frames weakly clumped. Similarly, female spiders were nearly clumped in the population on guardrails.<br>It suggests that a strong gregariousness occurs among the female individuals. However, the males showed uniform distribution. The distances among individuals are quite close to about 1 or 2mm. The web of this species has two components, i.e. (1) an irregular web of hackled band threads for snaring insects and (2) a retreat of thin threads. In conclusion, the abundance of insects trapped by fluorescent light cause each spider population of window frames and of roadside guardrails to make a considerable gregariousness.

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