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Group predatory behavior by the assassin bugAgriosphodrus dohrni Signoret (Hemiptera: Reduviidae)

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Researches on Population Ecology

Summary

Nymphs ofAgriosphodrus dohrni Signoret (Reduviidae) have a strong gregariousness and show group predatory behavior. This study was conducted to clarify adaptive significance of group predation of this species, including laboratory observations and 6-year field surveys.

In the laboratory, observations on both solitary and group attacking against armyworms were made at varying prey size classes to compare the capture success rate by solitary predators with that by groups. The efficiency in capturing the prey was significantly higher in group attacking at any prey size class compared.

Data obtained from the field surveys indicated the tnedency for searching nymphs to feed in group and to increase the number of predators feeding per prey item with increasing prey size. Average sizes of prey captured were also larger in group feeding throughout the nymphal stage. In particular, it was remarkable that, when prey were “creeping” types, the upper size limit of prey eaten was dramatically increased.

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Authors and Affiliations

  1. Entomological Laboratory, College of Agriculture, Kyoto University, 606, Kyoto, Japan

    Hiroshi Inoue

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  1. Hiroshi Inoue
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Inoue, H. Group predatory behavior by the assassin bugAgriosphodrus dohrni Signoret (Hemiptera: Reduviidae). Res Popul Ecol 27, 255–264 (1985). https://doi.org/10.1007/BF02515464

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  • DOI: https://doi.org/10.1007/BF02515464

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