Abstract
This study was conducted to estimate relationship between temperature and egg development of Nannophya pygmaea, an endangerd dragonfly species in Korea, using eight different temperature conditions (17, 20, 22, 25, 28, 30, 33, and $36^{\circ}C$). Eggs of N. pygmaea were collected from female adults inhabited a small wetland in Mungyeong-si, Gyeongsangbuk-do, Korea, in June 2007. As a result, hatching rates were 2.86, 17.09, 24.32, 39.67, 34.43, 40.57, 44.79, and 1.75% at 17, 20, 22, 25, 28, 30, 33, and $36^{\circ}C$, respectively. The nonlinear model of the temperature related to egg development was well fit to the modified Sharpe and DeMichele model. The derived lower developmental threshold temperature for egg hatching was $14.02^{\circ}C$(y=0.005988x-0.084, $r^2$=0.99), and the derived optimal development temperature was $30{\sim}35^{\circ}C$.
본 연구는 한국의 멸종위기곤충인 꼬마잠자리 알의 발육과 온도의 관계를 추정하고자 8가지 서로 다른 온도 조건(17, 20, 22, 25, 28, 30, 33 및 $36^{\circ}C$)에서 실시하였다. 꼬마잠자리의 알은 2007년 6월 경상북도 문경시 일대의 산간 습지에 서식하는 암컷 성충으로부터 채취하였다. 실험의 결과, 부화율은 17, 20, 22, 25, 28, 30, 33, 그리고 $36^{\circ}C$에서 각각 2.86, 17.09, 24.32, 39.67, 34.43, 40.57, 44.79 및 1.75%였다. 각 온도에서의 알의 발달율(평균발육속도)은 변형된 Sharpe와 DeMichele의 비선형 모형에 부합하였다. 알의 저온발육임계온도는 $14.02^{\circ}C$(y=0.005988x-0.084, $r^2$=0.99)로 추정되었고, 발육최적온도는 $30{\sim}35^{\circ}C$로 추정되었다.
