Ocean and Polar Research

Korea Institute of Ocean Science & Technology (한국해양과학기술원)
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Interactive Effects of Increased Temperature and pCO2 Concentration on the Growth of a Brown Algae Ecklonia cava in the Sporophyte and Gametophyte Stages

갈조류 감태(Ecklonia cava)의 포자체와 배우체 생장에 영향을 주는 수온과 pCO2 농도의 상호작용

  • Oh, Ji Chul (Marine Reserch Center, National Park Research Institute, Korea National Park Service) ;
  • Yu, Ok Hwan (Marine Life and Ecosystem Division, KIOST) ;
  • Choi, Han Gil (Division of Biological Science, College of Natural Sciences, Wonkwang University)
  • 오지철 (국립공원관리공단 국립공원연구원 해양연구센터) ;
  • 유옥환 (한국해양과학기술원 생물.생태계연구본부) ;
  • 최한길 (원광대학교 자연과학대학 생명과학부)
  • Received : 2015.08.13
  • Accepted : 2015.09.03
  • Published : 2015.09.30
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Abstract

To examine the effects of increased $CO_2$ concentration and seawater temperature on the photosynthesis and growth of forest forming Ecklonia cava (Laminariales, Phaeophyta), sporophytic discs and gametophytes were cultured under three $pCO_2$ concentrations (380, 750, 1000 ppm), four temperatures (5, 10, 15, $20^{\circ}C$ for sporophytes; 10, 15, 20, $25^{\circ}C$ for gametophytes), and two irradiance levels (40, $80{\mu}mol$ photons $m^{-2}s^{-1}$) for 5 days. Photosynthetic parameter values ($ETR_{max}$, $E_k$, and ${\alpha}$) were generally higher as sporophytic discs were grown under low temperature and increased $CO_2$ concentration at 750 ppm. However, photosynthesis of Ecklonia sporophytes was severely inhibited under a combination of high temperature ($20^{\circ}C$) and 1000 ppm $CO_2$ concentration at the two photon irradiance levels. The growth of gametophytes was maximal at the combination of 380 ppm (present seawater $CO_2$ concentration) and $25^{\circ}C$. Minimal growth of gametophytes occurred at enriched $pCO_2$ concentration levels (750, 1000 ppm) and high temperature of $25^{\circ}C$. The present results imply that climate change which is increasing seawater temperature and $pCO_2$ concentration might diminish Ecklonia cava kelp beds because of a reduction in recruitments caused by the growth inhibition of gametophytes at high $pCO_2$ concentration. In addition, the effects of increased temperature and $pCO_2$ concentration were different between generations - revealing an enhancement in the photosynthesis of sporophytes and a reduction in the growth of gametophytes.

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References

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