Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Estimation of Accumulated Degree Days Required for the Development of $Cloeon$ $dipterum$ (Ephemeroptera: Baetidae) in an Experimental Tub Under Field Conditions.

야외 실험 수조에서 추정한 연못하루살이($Cloeon$ $dipterum$)(Ephemeroptera: Baetidae)의 발육 유효적산온도

  • Lee, Cha-Young (College of Life Sciences and Biotechnology, Korea University) ;
  • Kim, Dong-Gun (College of Life Sciences and Biotechnology, Korea University) ;
  • Choe, Lak-Jung (College of Life Sciences and Biotechnology, Korea University) ;
  • Baek, Min-Jeong (College of Life Sciences and Biotechnology, Korea University) ;
  • Yoon, Tae-Joong (Korean Entomological Institute, Korea University) ;
  • Bae, Yeon-Jae (College of Life Sciences and Biotechnology, Korea University)
  • Received : 2012.02.20
  • Accepted : 2012.03.15
  • Published : 2012.03.31
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Abstract

We aimed to estimate the accumulated degree days required for the development of $Cloeon$ $dipterum$ (Ephemeroptera: Baetidae) in an experimental tub under field conditions from August 7 to October 10 in 2011. After 4 days in a tub setting, a dead female adult was found on the water surface at which oviposition had presumably occurred. Adults emerged from 39 days to 61 days after the oviposition date. The total number of emerged adults was 229, and the sex ratio (number of females : total population) was 0.45, although not statistically significant ($p$ >0.05). The males generally emerged earlier than females. Assuming that the basal temperature ($T_b$) value is $0^{\circ}C$, we estimated the number of accumulated degree days required for the development of $C.$ $dipterum$ to be $1,221.8{\pm}116.0$ DD (mean${\pm}$SD). Since the annual number of accumulated degree days in the reference wetland was measured to be 5,650.0 DD, we estimated that $C.$ $dipterum$ is multivoltine, with a maximum of 4 cohorts in 1 year in natural habitats.

연못하루살이의 성장에 필요한 유효적산온도를 구하고자 2011년 8월 7일부터 10월 10일까지 야외에 설치한 실험 수조에서 실험을 수행하였다. 실험 수조 설치일로부터 4일 경과 후 수면에서 죽은 암컷 성충 한 개체가 발견되어 산란이 이루어졌을 것으로 추정하였으며, 산란추정일로부터 39일째부터 성충이 우화하기 시작하여 61일째에 마지막 개체가 우화하였다. 우화한 성충은 총 229개체였고, 성비(암컷 수/전체 수)는 0.45로 수컷이 많았으나 통계적으로 유의하지 않았으며($p$ >0.05), 전체적으로 수컷이 먼저 우화하는 경향을 보였다. 최저 발육임계온도를 $0^{\circ}C$로 하여 유효적산온도를 산출한 값은 $1,221.8{\pm}116.0$ DD였으며, 대조습지의 연간 유효적산온도가 5,650.0 DD임을 고려할 때, 연못하루살이는 본 연구결과를 적용할 경우 야외 서식처에서 최대 1년 4세대의 생활사를 가질 가능성이 있다.

Keywords

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