Plankton net community production and dark respiration in the Arabian Sea during September 1994 |
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Institution: | 1. Great Lakes Institute for Environmental Research, University of Windsor, Windsor, Ontario, Canada;2. Department of Mathematical and Statistical Sciences, Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada;3. Department of Mathematical Sciences, University of Cincinnati, Cincinnati, OH, United States;1. USDA UV-B Monitoring and Research Program, Colorado State University, Fort Collins, CO 80523, USA;2. Laboratory of Atmospheric Physics, Aristotle University of Thessaloniki, PO Box 149, 54124 Thessaloniki, Greece;3. Belgian Institute for Space Aeronomy, BIRA-IASB, Brussels, Belgium |
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Abstract: | Plankton community net and gross production and dark respiration were determined from in vitro changes in dissolved inorganic carbon and dissolved oxygen during September 1994 along a southeast offshore transect in the Arabian Sea. Surface rates of gross production decreased from 17±0.7 mmol C m-3 d-1 at a coastal upwelling station to 3±0.8 mmol C m-3 d-1 at the most offshore station. The euphotic zone at the time of sampling was predominantly heterotrophic, with integrated net community production values ranging from 15±7 mmol C m-2 d-1 inshore to −253±32 mmol C m-2 d-1 offshore. Calculations of the respiration attributable to the major plankton groups could account for 61–87% of the dark community respiration measured at the inshore stations, but only 15–26% of the community respiration determined offshore. Comparison of the fluxes of dissolved inorganic carbon and oxygen revealed a tendency for higher respiratory quotients than those calculated for organic metabolism prevailing at the offshore stations. |
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