Recovery of an endangered butterfly species, Shijimiaeoides divinus, population at Azumino in Nagano Prefecture, Japan

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  • 長野県安曇野における絶滅危惧種オオルリシジミ個体群の回復

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The large shijimi blue, Shijimiaeoides divinus, is a grassland lycaenid butterfly classified as an endangered species by the Ministry of Environment. In this study, I report on the life history of S. divinus barine and provide new data on the recovery of the natural population in Azumino. This butterfly is single-breeded with the adults usually appearing from late May to early June in Nagano Prefecture. Only three populations of S. divinus barine are maintained in Nagano Prefecture by several volunteer groups. In Azumino, efforts to introduce individuals at pupal stage in a butterfly sanctuary failed because of appearance of the egg parasite Trichogramma chilonis, which is an important mortality factor of the egg stage of S. divinus barine. On March 29, 2009, we experimentally tested the effect of bush burning on eggs parasitoids. Bush burning proved to have a negative effect on T. chilonis. Subsequently, bush burning was performed in a wide area during 2011 as a conservation measure. As a result, natural population of S. divinus barine recovered at the sanctuary area in Azumino after 15 years of absence.

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