Phytoplankton ecology in the Southern Benguela current. II. Carbon assimilation patterns |
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| Affiliation: | 1. School of Applied Sciences, Edinburgh Napier University, Edinburgh, UK;2. Centre for Marine Biodiversity & Biotechnology, Heriot-Watt University, Edinburgh, UK;3. St Abbs Marine Station, St Abbs, UK;1. Centre for Mathematical Biology and Ecology, Department of Mathematics, Jadavpur University, Kolkata 700032, India;2. Department of Applied Mathematics, Maharaja Bir Bikram University, Agartala, Tripura 799004, India;1. Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Ministry of Education, Shanghai Ocean University, Shanghai 201306, China;2. Shanghai Engineering Research Center of Aquaculture, Shanghai Ocean University, Shanghai 201306, China;3. Joint Laboratory for Monitoring and Conservation of Aquatic Living Resources in the Yangtze Estuary, Shanghai 200092, China;4. Shanghai Aquatic Wildlife Conservation and Research Center, Shanghai 200003, China;1. Duke University, Department of Biology, United States of America;2. Woods Hole Oceanographic Institution, Biology Department, United States of America;3. Massachusetts Institute of Technology, MIT/WHOI Joint Program in Oceanography, United States of America;4. Woods Hole Oceanographic Institution, Marine Chemistry & Geochemistry Department, United States of America |
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| Abstract: | The patterns of carbon assimilation into the major end-products of phytoplankton photosynthesis were studied in the Southern Benguela current during the summer of 1979–1980 using [ 14C]bicarbonate as a tracer. Greater activity was measured in the polysaccharide (TCA-soluble) fraction in aged upwelled water (Type 3) than in maturing upwelled water (Type 2) at both high and low light intensities. Conversely, a greater proportion of the label was incorporated into the protein (TCA-insoluble) fraction in maturing than in aged upwelled water. An approximately equal distribution of the label between polysaccharide and protein at the 50% light intensity was recorded in freshly upwelled water (Type 1), but at the 1% intensity greater activity was detected in the ethanol-soluble fraction. In ageing upwelled water (Types 2 and 3) more carbon-14 was incorporated into polysaccharide at the 50% light intensity than at the 1% intensity, but the percent incorporation was greater in Type 3 water when low nitrate concentrations prevailed. In this ageing water radioactivity in the protein fraction was greater at the 1% intensity than at 50% intensity. |
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