HR: 0800h
AN: OS51A-0555    [Abstracts]
TI: Organic Matter Composition, Recycling Susceptibility and the Effectiveness of the Biological Pump - An Evaluation using NMR Spectra of Marine Plankton
AU: * Paytan, A
EM: apaytan@pangea.stanford.edu
AF: Stanford University, Department of Geological and Environmental Sciences Stanford University, Stanford, CA 94305-2115 United States
AU: Cade-Menun, B
EM: bjcm@pangea.stanford.edu
AF: Stanford University, Department of Geological and Environmental Sciences Stanford University, Stanford, CA 94305-2115 United States
AB: The degree of organic matter biodegradation and recycling depends on the "reactivity" of compounds synthesized by the biota, which in turn is controlled by the structural characteristics of these compounds. Thus, abundance of a wide-range of organic compounds in seawater would lend itself to different susceptibility for biodegradation, which in turn is important for estimating the potential for rapid regeneration in the euphotic zone and thus the effectiveness of the biological pump. We employed 13C and 31P NMR spectroscopy on cultures of phytoplankton dominating blooms in the Southern Ocean grown under five light levels at 3oC. We found differences in both C and P compounds synthesized by the different taxa as well as for each species at various light levels. Results suggest variability in synthesized organic compounds by different taxa and by a single species grown in different environmental conditions. understanding of the oceanic C cycle in general and C sequestration effectiveness in particular.
DE: 4800 OCEANOGRAPHY: BIOLOGICAL AND CHEMICAL (0460)
DE: 4805 Biogeochemical cycles, processes, and modeling (0412, 0414, 0793, 1615, 4912)
DE: 4806 Carbon cycling (0428)
DE: 4850 Marine organic chemistry (0470, 1050)
DE: 4855 Phytoplankton
SC: Ocean Sciences [OS]
MN: Fall Meeting 2005