Aquatic Sciences Meeting, Albuquerque 2001
| SS06 Carbon Fluxes at Ocean and Large Lake Margins (Environmental Connections) |
| Date: Friday, February 16, 2001, Time: 8:45:00 AM |
| Location: Cochiti/Taos |
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| Lu, X, , Southeast Environmental Research Center (SERC)/Dept of Chemistry, Florida International University, Miami, FL, USA, lux@fiu.edu |
| Davis, S, E, SERC, Florida International University, Miami, FL, USA, davisst@fiu.edu |
| Jaffe, R, , SERC/Dept of Chemistry, Florida International University, Miami, FL, USA, jaffer@fiu.edu |
| Childers, D, L, SERC/Dept of Biological Sci, Florida International University, Miami, FL, USA, childers@fiu.edu |
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| THE IMPORTANCE OF PHOTOCHEMICAL AND MICROBIAL PROCESSES IN THE EVOLUTION OF FRESHLY LEACHED DISSOLVED ORGANIC MATTER AND NUTRIENTS FROM RED MANGROVE LEAVES |
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| Studies of the sources and fate of dissolved organic matter (DOM) in the coastal Everglades are pertinent to understanding the cycling of materials through the aquatic food chain of this system. We investigated the fate of DOM and nutrients leached from red mangrove leaves, a large detrital source to the estuarine zone of the Everglades. Light and dark bottles containing mangrove leachate were incubated for up to 3 months. Poisoned incubations were also used to determine the effects of photochemical degradation. Non-poisoned samples yielded an immediate (1day) stimulation of bacterial growth that increased throughout the first month, reflecting the lability of mangrove leachate. Concomitantly, the organic carbon content of the non-poisoned leachate decreased from 5.3mM to 4mM after one month. Examination of poisoned and non-poisoned samples by spectroscopic techniques showed considerable changes in the concentration, composition, and structure of DOM, demonstrating the relative importance of these processes in the degradation of mangrove-derived DOM. Our findings indicate that mangrove leaf litter provides an important DOM and nutrient source that may fuel autotrophic and heterotrophic communities in situ and in Florida Bay. |
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