オオルリシジミ(九州亜種)の発生に及ぼす天敵と生息環境の影響

概要

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The natural enemies of Shijimiaeoides divinus asonis were surveyed in the Aso area from 1989 to 2002. A number of predators were collected from the habitat of this butterfly: Menida violacea (Pentatomidae); Promachus yesomicus (Asilidae); Agelena limbata (Oxyopidae); Tibellus oblongus (Philodromidae); Xysticus ephippitatus (Thomisidae) and Carthus xanthogramma (Salticidae). M. violacea was observed to prey on the larvae of S. divinus asonis. In addition, Cordyceps sp. (Clavicipitaceae), an entomopathogenic fungus of this butterfly, and Trichogramma sp. (Trichogrammatidae), the egg parasitoid, were collected. Of these indigenous natural enemies, T. sp. is likely to be the most effective against this butterfly. The effect of pasturage on abundance of S. divinus asonis was also investigated. The percentage parasitism of T. sp. was high in the area where routine pasturage was not carried out. Routine pasturage seems to have positive influence on the population of this butterfly. We conclude that the pasturage in these areas shall be necessary in order to preserve the population of S. divinus asonis as well as to maintain the grassland.
2003-06-25