Diurnal fluctuations of photosynthetic activity and productivity in natural phytoplankton community under future climate conditions

Title
Diurnal fluctuations of photosynthetic activity and productivity in natural phytoplankton community under future climate conditions
Author(s)
김주형; 강은주; 신경순; 이기택; 김광용
KIOST Author(s)
Shin, Kyoung Soon(신경순)
Publication Year
2010-06-03
Abstract
Mesocosm experiment was conducted to evaluate the effects on phytoplankton community under the future climate conductions. Enclosed mesocosm facility was fixed on floating raft system at Jangmok Bay (34.6 oN, 128.5 oE), and phytoplankton community was incubated under the conditions of increased pCO2 and/or temperature predicted value of 2100 (present: ca. 360 ppm +ambient temp., acidification: ca. 860 ppm +ambient temp., greenhouse: ca .860 ppm +high temp.). Chlorophyll a fluorescence was measured with 8-9 subsampling from dawn to dusk for understanding the diurnal fluctuations of photosynthetic activity. From the steady-state light-response curves (LCs) parameters,smaller values were shown at acidification condition compared with the present and greenhouse conditions after 5 days. Also community production, which is calculated by photosynthesis-irradiance curves, total biomass and in situ light attenuation profiles, were not affected throughout the experiment period. Our results represent that light utilization ability can be declined at high CO2 conditions with down-regulation of photosynthetic activity. We propose that primary production of phytoplankton community not affectedfrom physiological transition cased by enhanced CO2.
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/28923
Bibliographic Citation
2010년도 한국해양과학기술협의회 공동학술대회, pp.102, 2010
Publisher
한국해양과학기술협의
Type
Conference
Language
English
Publisher
한국해양과학기술협의
Related Researcher
Research Interests

Plankton ecology and physiology,Risk assessment,Ship ballast water,플랑크톤 생리, 생태,위해성평가,선박평형수

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