Photosynthetic oxygen production and community respiration in the Indian sector of the Antarctic Ocean during austral summer |
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Authors: | Tsuneo Odate Ken Furuya Mitsuo Fukuchi |
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Institution: | 1.Laboratory of Biological Oceanography, Faculty of Bioresources, Mie University, 1515, Kamihama-cho, Tsu 514-8507, Japan,;2.National Institute of Polar Research, 9-10, Kaga, 1-chome, Itabashi-ku, Tokyo 173-8515, Japan, |
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Abstract: | Photosynthetic oxygen production by phytoplankton and community respiration in the Indian sector of the Antarctic Ocean were estimated from changes in oxygen concentrations in light and dark bottles. Gross production varied between 0.1 and 5.1 µmol O2 l-1 day-1. In the same water, community respiration (the sum of oxygen consumption by heterotrophs and phytoplankton) was 0.4-3.6 µmol O2 l-1 day-1, which accounted for 47-343% of the gross production. Algal and heterotrophic respirations were distinguished using some assumptions. These estimates showed that heterotrophic respiration accounted for most of the community respiration (70-91% depending upon the assumptions), indicating that heterotrophic respiration plays an important role in the mineralization of phytoplankton production in the surveyed sea area. Gross production rate correlated with chlorophyll a concentration, showing that the photosynthetic production rate of oxygen depends on the abundance of phytoplankton. Moreover, there was a significant relationship between gross production and community respiration rates. These regression equations suggested that negative net production occurred under the usually low concentration of chlorophyll observed in the Indian sector of the Antarctic Ocean. Hence, the net exchange of carbon dioxide due to biological processes through the sea surface seemed to be not as large as expected in the Antarctic Ocean, although the number of data were limited at this stage. |
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