Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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The Effect of Ocean Acidification on Early Growth of Juvenile Oliver Flounder (Paralichthys olivaceus): in situ Mesocosm Experiment

해양산성화가 넙치의 초기발달에 미치는 영향: 현장 메조코즘(mesocosm) 실험

  • 심정희 (국립수산과학원 어장환경과) ;
  • 권정노 (국립수산과학원 어장환경과) ;
  • 박주면 (부경대학교 해양과학공동연구소) ;
  • 곽석남 (환경생태공학연구원)
  • Received : 2013.10.31
  • Accepted : 2013.11.18
  • Published : 2013.12.31
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Abstract

An in situ mesocosm experiment was designed to investigate how exposure to ocean acidification by increased carbon dioxide affected the growth of juvenile oliver flounder (Paralichthys olivaceus). A total of 447 individuals were reared in the mesocosm experimental devices deployed at sandy-muddy bottom in the southern coast of East Sea for 43 days and divided into two groups: treatment group (223 individuals, $6.32{\pm}0.75$ cm, high-$CO_2$ environment) and control group (224 individuals, $6.34{\pm}0.84$ cm, natural $CO_2$ environment). The average values of pH and $CO_2$ concentration in the treatment device were $7.63{\pm}0.13$ and $1660{\pm}540$ ${\mu}atm$, respectively, while those in the control device were $8.07{\pm}0.05$ and $514{\pm}65$ ${\mu}atm$, respectively. There was no significant difference in mortality rate between treatment and control group, and the mortalities in two groups gradually decreased during the study period. But, the increase of size and weight of juvenile oliver flounder was higher in control group than treatment group, i.e., weight gain or growth rate was higher in control group. These results suggested that high $CO_2$ environments could have a significant negative influence on the early growth of juvenile oliver flounder.

해양에서 이산화탄소 증가에 따른 해양산성화가 넙치치어의 성장에 미치는 영향을 조사하기 위하여 현장 메조코즘 실험을 실시하였다. 동해 남부에 위치한 기장군 장안읍의 사질저질에서 실험군(이산화탄소 주입)과 대조군의 실험장비를 설치하여 43일 동안 총 447개체 (실험군 223개체, 대조군 224개체)를 대상으로 실시하였다. 실험군의 pH는 평균 $7.63{\pm}0.13$, 이산화탄소 ($fCO_2$)농도는 평균 $1660{\pm}540$ ${\mu}atm$로 2100년도에 예상되는 수준으로(IPCC 2007) 유지하였으며, 대조구는 현재 기장군 장안읍 해역의 해양환경으로 유지하였다. 실험기간동안 사망률은 실험군과 대조군 사이에서 큰 차이를 나타내지 않았고 시간이 지남에 따라 감소하는 경향을 나타내었다. 넙치치어의 체장과 체중은 대조군에서 더 큰 증가양상을 나타내어, 그 결과 대조군에서 더 큰 성장률(specific growth rate)을 보였다. 결론적으로 본 연구는 해양에서 이산화탄소 농도의 증가는 넙치 치어의 초기 성장에 영향을 줄 수 있는 가능성을 제시하였다.

Keywords

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