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Hea-Son Bang,Carmen Huerta Crespo,Young-Eun Na,Min-Su Han,이준호 한국응용곤충학회 2008 Journal of Asia-Pacific Entomology Vol.11 No.4
Seasonal activity of the native dung beetles, Copris ochus (Motschulsky) and Copris tripartitus Waterhouse, was studied in Jeju Island, Korea. Reproductive condition and breeding cycles of adult females were determined using physiological age-grading techniques to assess the proportions of newly emerged, nulliparous and parous beetles, and those resorbing oocytes. C. ochus appears to be univoltine. Its main period of adult emergence occurs in summer rather than in spring (March–May), as was previously thought. The female population consisted of the complete range of reproductive age classes in August– September. C. tripartitus also appears to be univoltine. However, this species has two adult activity periods: a peak activity in spring when most oviposition occurs, and another in autumn when the new generation emerges. With the onset of winter, C. tripartitus adults cease reproductive development and females over winter in a nulliparous stage.
Hea-Son Bang,이경열,심재경,정명표,김명현,강기경,이덕배 한국응용곤충학회 2011 Journal of Asia-Pacific Entomology Vol.14 No.3
Paratlanticus ussuriensis eggs overwinter by entering diapause, which can be prolonged to more than 1 year depending on environmental conditions. To determine temperature effects on diapause duration of P. ussuriensis eggs, the rates of embryonic development and hatching were compared at various temperatures conditions by measuring embryonic stages and egg weights. Most eggs stayed in a very young stage (blastoderm formation, stage 4) when reared at 15 and 20 °C, 10–30% eggs developed into middle or late stages when reared at 25 °C, and most embryos developed fully (stage 23/24) when reared at 30 °C. Egg weight at 30 °C was 1.5 times higher than those reared at 20 °C. Chilling induced hatching in embryos at stage 23/24. Chilling caused stage 4 embryos to develop into stage 24, but they failed to hatch in response to a second warm period. Thus, P. ussuriensis eggs can overwinter either as young embryos (initial diapause) or as fully-developed embryos (final diapause). Eggs that experience an initial diapause overwinter again the second year in a final stage diapause. The post-diapause period was shorter when embryos overwintered in a final stage diapause. The hatching rate was highest in a temperature range of 7.5–15 °C. Our results suggest that temperature is an important environmental factor for the control of prolonged diapause in P. ussuriensis and initial diapause plays an important role in the control of its life cycle.
Development of Copris tripartitus (Coleoptera: Scarabaeidae) in Two Different Rearing Media
Bang, Hea-Son,Wardhaugh, K.G.,Hwang, Seok-Jo,Kwon, Oh-Seok 한국곤충학회 2003 Entomological Research Vol.33 No.3
Like many other sub-social insects, Copris tripartitus Waterhouse requires parental care during the development period in the brood balls. Mass-rearing is achieved by using indoor rearing systems and adding more dung after taking away the brood balls containing eggs. Without parental care, larvae are often affected by desiccation, as well as by fungal or sciarid fly intrusion of the brood balls. This study developed a good substitute for brood ball rearing medium. A significantly greater number of progeny survived to adulthood from broods produced by beetles reared on vermiculite medium ($90.69{\pm}10.98%$) than on peat moss medium ($44.82{\pm}13.92%$). Results of the study suggest that to protect the brood balls from desiccation and to produce healthy adults, 15-20% moisture content vermiculite must be used as brood ball rearing medium for most species reared in the laboratory.
Bang, Hea-Son,Crespo, Carmen Huerta,Na, Young-Eun,Han, Min-Su,Lee, Joon-Ho 한국응용곤충학회 2008 Journal of Asia-Pacific Entomology Vol. No.
Seasonal activity of the native dung beetles, Copris ochus (Motschulsky) and Copris tripartitus Waterhouse, was studied in Jeju Island, Korea. Reproductive condition and breeding cycles of adult females were determined using physiological age-grading techniques to assess the proportions of newly emerged, nulliparous and parous beetles, and those resorbing oocytes. C. ochus appears to be univoltine. Its main period of adult emergence occurs in summer rather than in spring (March-May), as was previously thought. The female population consisted of the complete range of reproductive age classes in August-September. C. tripartitus also appears to be univoltine. However, this species has two adult activity periods: a peak activity in spring when most oviposition occurs, and another in autumn when the new generation emerges. With the onset of winter, C. tripartitus adults cease reproductive development and females over winter in a nulliparous stage.