ハダニ類の吐糸行動の解析

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タイトル別名
  • Study on Spinning Behavior of Spider Mites
  • ハダニルイ ノ トシ コウドウ ノ カイセキ 3 ヨウメン ニ オケル アミ
  • III. Responses of Mites to Webbing Residues and Their Preferences for Particular Physical Conditions of Leaf Surfaces (Acarina: Tetranychidae)
  • III. 葉面における網の形成と微生息場所選好

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Comparative studies of behavior of four species of spider mites, Oligonychus ununguis, Panonychus citri, Schizotetranychus celarius and Tetranychus urticae, with respect to the mites' responses to the webbing residues and their preferences for particular physical conditions of leaf were conducted under laboratory conditions. Active walking was observed in the females of T. urticae and S. celarius during the first hour after release on the leaves. Thereafter the mites of these two species became less active and spent most of their time feeding and/or resting. The activity was low in the females of O. ununguis during the first hour, but otherwise their behavioral pattern was similar to that of the above two species. The females of P. citri, however, were always found to be least active during the whole first hour of observation. The females of O. ununguis and S. celarius strongly preferred depressions along the vein, while those of T. urticae and P. citri failed to show such preference. The mites of the four species responded differently to their threads or webs. The females of O. ununguis mostly lived under the webs, those of S. celarius only under the webs, while those of T. urticae walked upon, in or under the webs, but fed mainly under the webs. The females of P. citri spun while walking, but appeared to live in avoiding their own threads and they did not construct webs. From the results of the previous and present studies, it is conceivable that the spider mite threads serve as the “lifelines” throughout their life on trees, and also as the “material for building structures” useful for their life on microhabitats.

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