Effect of Predation by the Specialist Predator, Parena perforata BATES (Coleoptera: Carabidae) on Population Changes of the Mulberry Tiger Moth, Thanatarctia imparilis BUTLER (Lepidoptera: Arctiidae)

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  • Effect of Predation by the Specialist P

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Population changes of the mulberry tiger moth, Thanatarctia imparilis and the carabid beetle Parena perforata, a nest inhabiting specialist predator of its larvae, were analyzed. The number of T. imparilis colonies decreased suddenly from 1989 to 1991 and, gradual increased thereafter from 1991 to 1995. The carabid beetle was observed in ca. 90% of the prey colonies in 1990, however, it was not observed in 1991 and 1992. From 1993 to 1995, the density of P. perforata increased with the increase in density of T. imparilis. About 90% of T. imparilis larval colonies were destroyed before entering hibernation in 1990, while the destruction of larval colonies was only ca. 10% both in 1993 and 1994. although the predation by P. perforata acted strongly during the declining phase of the T. imparilis population, it did not act during the increasing phase. It was suggested that P. perforata is an important factor in regulating T. imparilis populations.

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