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

• Published in: Ocean and polar research pp. 201 - 209
• Main Authors: 오지철, 유옥환, 최한길
• Format: Journal Article
• Language: Korean
• Published: 한국해양과학기술원 01.09.2015
• Subjects: 해양학
• ISSN: 1598-141X; 2234-7313
• DOI: 10.4217/OPR.2015.37.3.201

To examine the effects of increased CO2 concentration and seawater temperature on the photosynthesis and growth of forest forming Ecklonia cava (Laminariales, Phaeophyta), sporophytic discs and gametophytes were cultured under three pCO2 concentrations (380, 750, 1000 ppm), four temperatures (5, 10, 15, 20oC for sporophytes; 10, 15, 20, 25oC for gametophytes), and two irradiance levels (40, 80 μmol photons m−2s−1) for 5 days. Photosynthetic parameter values (ETRmax, Ek, and α) were generally higher as sporophytic discs were grown under low temperature and increased CO2 concentration at 750 ppm. However, photosynthesis of Ecklonia sporophytes was severely inhibited under a combination of high temperature (20oC) and 1000 ppm CO2 concentration at the two photon irradiance levels. The growth of gametophytes was maximal at the combination of 380 ppm (present seawater CO2 concentration) and 25oC. Minimal growth of gametophytes occurred at enriched pCO2 concentration levels (750, 1000 ppm) and high temperature of 25oC. The present results imply that climate change which is increasing seawater temperature and pCO2 concentration might diminish Ecklonia cava kelp beds because of a reduction in recruitments caused by the growth inhibition of gametophytes at high pCO2 concentration. In addition, the effects of increased temperature and pCO2 concentration were different between generations - revealing an enhancement in the photosynthesis of sporophytes and a reduction in the growth of gametophytes. KCI Citation Count: 2