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Abstract ▼ AI-Helper

For the selection of insect species with environmental importance, five species of dung beetles were collected by pitfall traps from May to October in Je-Ju Island. Among them, oviposition behaviour of two species, Copris tripartitus and C. ochus was examined by employing several rearing methods. As...

For the selection of insect species with environmental importance, five species of dung beetles were collected by pitfall traps from May to October in Je-Ju Island. Among them, oviposition behaviour of two species, Copris tripartitus and C. ochus was examined by employing several rearing methods. As the broods were removed from the nest at specific times following the formation of the last brood ball, providing the beetle with an added dung on the soil surface, the female was capable of constructing another nest and laying further eggs in laboratory condition (23-$25^{\circ}C$, RH 60-70%). C. tripartitus and C. ochus females were induced to lay eggs continually. The ovary of a female consists of a vitellarium containing sequentially maturing follicles, a single oviduct with the spermatheca attached. Egg Productivity increased 3 to 4 times more than that of normally laid in the field. With this technique, C. tripartitus produced an average of 13 eggs/female and C. ochus 9 eggs/female. The average brood ball weight of C. tripartitus was 10.0$\pm$0.46 g and that of C. ochus 40.30$\pm$5.32 g. After collecting in May 1999, first oviposition of C. tripartitus takes 15days and oviposited for 70days. On the other hand, first oviposition of C. ochus takes 60days and oviposited for 150days in the indoor rearing condition (23-$25^{\circ}C$, RH 60-70%).

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