Aquatic Sciences Meeting, Albuquerque 2001
| SS03 Chemosynthetic Processes at Oxic-Anoxic Interfaces (Environmental Connections) |
| Date: Tuesday, February 13, 2001, Time: 4:45:00 PM |
| Location: Mesilla |
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| Taylor, G, T, SUNY Stony Brook, Marine Sciences Research Center, Stony Brook, USA, gtaylor@notes.cc.sunysb.edu |
| Iabichella, M, , SUNY Stony Brook, Marine Sciences Research Center, Stony Brook, USA, miabiche@ic.sunysb.edu |
| Scranton, M, I, SUNY Stony Brook, Marine Sciences Research Center, Stony Brook, USA, mscranton@notes.cc.sunysb.edu |
| Ho, T, Y, SUNY Stony Brook, Marine Sciences Research Center, Stony Brook, USA, tyho@ic.sunysb.edu |
| Muller-Karger, F, , Univ. South Florida, Dept. Marine Sciences, St. Petersburg, USA, carib@carbon.marine.usf.edu |
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| IMPACT OF CHEMOAUTOTROPHIC PRODUCTION ON CARBON CYCLING IN THE CARIACO BASIN |
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| Peaks in chemoautotrophic production (dark C fixation) extended over a depth range of 60 to 100 m below the O2/H2S interface during 10 cruises to the CARIACO (Carbon Retention in a Colored Ocean) times series station in the eastern Cariaco sub-basin. Suboxic chemoautotrophic production over this interval (27-159 mmole C/m2/d) varied from 0.1 to 3.3 times that of contemporaneous net primary production in the photic zone (Nov 96 to Nov 00) and from 3 to 35 times fluxes of sedimenting biogenic debris entering this horizon. Chemoautotrophic production was approximately 2.5 to 50 (mean = 11) times greater than heterotrophic bacterial production (measured by 3H-leucine) and 1.5 to 16 times greater than acetate uptake (mean = 3.3) in this layer.
Rates of dark C fixation are controlled by fluxes of reductants (reduced S) and oxidants (O2, NO3, metals), but diffusive fluxes are inadequate to balance observations. Importance of advective and mixing processes in controlling production and role of chemoautotrophs in microbial loop will be evaluated for this system. Implications of sedimenting chemoautotrophic production on paleoclimatological sediment record will be explored. |
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