常盤松御用邸の蛾類

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One hundred and fifty-nine species of moths in 29 families were collected in the Tokiwamatsu Imperial Villa, ca. 2 ha in area, central Tokyo. The survey was carried out from 2002 to 2004 by using a light and a Malaise traps and by ordinary day-time collectings of adults and larvae. Of these moths, 69 species, 44%, are recorded from the Imperial Palace, Tokyo (Owada et al., 2000), the garden of the Institute for Nature Study, Tokyo (Owada et al., 2001) and the Akasaka Imperial Gardens, Tokyo (Owada et al., 2005), and 15 species, 9%, are not recorded from the other research sites. The Malaise trap was quite useful for researches of moths for the small restricted forest at bright nights of the urban centre of Tokyo, though intercepted moths were wet by ethanol liquid. The trap was set in a forest bed of evergreen broadleaved trees. The most dominant moth is Synegia esther, Geometridae, 152 exs., and succeeding moths are: Gynaephila maculifera, Noctuidae, 58 exs., Endotricha olivacealis, Pyralidae, 54 exs, Zanclognatha culvilinea, Noctuidae. 47 exs., Hydrillodes lentalis, Noctuidae, 33 exs., Amata fortunei, Arctiidae, 29 exs., Simplicia xanthoma, Noctuidae, 25 exs., Orthosia fausta, Noctuidae, 17 exs., and Diarsia deparca, Noctuidae, 15 exs. Larvae of the dominant geometrid moth, Synegia esther, feed on Ilex spp., Aquifoliaceae, which are planted abundantly in gardens of temperate Japan. Other dominant species, Gynaephila maculifera, Endotricha olivacealis, Zanclognatha culvilinea, Hydrillodes lentalis, Noctuidae, Simplicia xanthoma, Noctuidae, are dead leaf feeders or scavengers. It is worth noting that many moths of Amata fortunei were trapped; what is the reason why the open land flyers entered into a dark forest bed of evergreen trees? This phenomenon seems to suggest an unknown behavior of A. fortunei. As was pointed out by the former report (Owada et al., 2005), many notodontid moths were extinct from large green tracts of the Tokyo urban area. Only one notodontid moth, Torigea straminea, a bamboo grass feeder, still survives in the Tokiwamatsu Imperial Villa, Tokyo. In such a large residence with gardens as the Villa, bamboo grasses, e.g., Sasa, Pleioblastus, Phyllostachys, etc., are used to be planted for landscape, and T. straminea may be able to survive on those colonies. Establishment of Cerace xanthocasma, Tortrocidae, in the large green tracts of Tokyo was analysed by the series of our researches (Owada et al., 2000, 2001, 2005). The first moth (a female) was discovered from the Imperial Palace, Tokyo, in 1997, a few larvae were collected in the same tract and the garden of the Institute for Nature Study, Tokyo in 1999, and the discovery of adults and larvae was gradually increased from 2000 to 2002. In the spring of 2003, many nests made by the larvae of this tortricid moth were found on leaves of evergreen trees everywhere in the Imperial Palace and the Akasaka Imperial Gardens, Tokyo, and the outbreak of moths occurred in July. In 2004, hibernating larvae were also found abundantly, but the occurrence of moths was not so abundant as in 2003. On the contrary, since we were able to find out only one nest of C. xanthocosma in the garden of the Tokiwamatsu Imperial Villa in the spring of 2004, this moth does not yet settle down in whole areas of Tokyo.
国立科学博物館の論文
2005-03-25

常盤松御用邸の蛾類

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