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Effect of Temperature on Hatching Rate of Nannophya pygmaea eggs (Odonata: Libellulidae)  

Kim, Dong-Gun (Department of Biology, Seoul Women's University)
Yum, Jin-Whoa (Department of Biology, Seoul Women's University)
Yoon, Tae-Joong (Department of Biology, Seoul Women's University)
Bae, Yeon-Jae (Department of Biology, Seoul Women's University)
Publication Information
Korean journal of applied entomology / v.45, no.3, 2006 , pp. 381-383 More about this Journal
Abstract
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.
Keywords
Nannophya pygmaea; Libellulidae; Odonata; Eggs; Hatching rate;
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