멸종위기종인 꼬마잠자리의 부화율을 5개의 온도조건($10,;15,;20,;25,;30^{circ}C$)에서 조사하였다. 꼬마잠자리의 알은 2006년 7월 경상북도 문경시 일대의 한 작은 습지에 서식하는 암컷 성충으로부터 채취하였다. 부화율은 100일 동안 부화한 유충의 수로부터 구하였다. 꼬마잠자리의 알은 20, 25 및 $30^{circ}C$의 온도조건에서 각각 83, 89 및 76%가 부화하였으며, $10^{circ}C$와 $15^{circ}C$에서는 실험기간동안 부화하지 않았다. 꼬마잠자리 알의 부화 임계온도는 $14.3^{circ}C$로 추정되었으며, 다른 온대성 잠자리류보다 상대적으로 높았다.
The hatching rate of the eggs of Nannophya pygmaea Rambur, an endangered dragonfly species in Korea, was experimented in different temperature conditions ($10,;15,;20,;25,;and;30^{circ}C$) in laboratory. N. pygmaea eggs were collected from female adults inhabited a small wetland in Mungyong-si, Kyeongsangbuk-do, Korea, in July 2006. The hatching rate was evaluated from the number of hatched nymphs for the period of 100 days. As a result, the hatching rates were 83, 89, and 76% at $20,;25,;and;30^{circ}C$, respectively; however, eggs were not hatched at $10^{circ}C;and;15^{circ}C$ during the experiment period. The derived thermal threshold for egg hatching was $14.3^{circ}C$, which is relatively higher than the values of other temperate dragonflies.
