長崎地方におけるクロセンチニクバエの生活史

Abstract

An investigation of the life history of Boettcherisca septentrionalis Rohdendorf was made in Nagasaki Prefecture, Western Japan from January 1990 to December 1994. A trap baited with horse meat was maintained at each of 3 altitudes, 5m, 500m and 1,000m, on Mt. Gokahara-dake. The number of flies captured was recorded once a month. The larvae and pupae which had bred from meat in the trap were also counted and transferred into a separate trap for emergence. The middle region of the mountain was considered as a primary habitat of this flesh fly. At altitude 5m, all pupae were observed to enter diapause in fall. At altitudes 500m and 1,000m, most pupae entered diapause, but some adults emerged in fall and might be overwintered at the middle of mountain. Adults emerged at altitude 1,000m probably migrated to the middle of mountain for hibernation before winter. After hibernation, males and females copulate in April, and females migrate again to higher altitudes for larviposition in early summer. From diapause pupae, adults emerged in May (alt. 5m), May to June (alt. 500m) and May to July (alt. 1,000m). All life stages were observed during summer when it seems to be the best season for breeding at all altitudes (51,000m). Boettcherisca septentrionalis is a long day insect and have 1-2 generations during summer in Western Japan.