||Pollutant Dynamics as Influenced by Seagrass Beds: Experiments with Tributyltin in 'Thalassia' Microcosms.
Levine, S. N. ;
Rudnick, D. T. ;
Kelly, J. R. ;
Morton, R. D. ;
Buttel, L. A. ;
||Cornell Univ., Ithaca, NY. Ecosystems Research Center. ;University of West Florida, Pensacola.;Environmental Research Lab., Gulf Breeze, FL.
Water pollution effects(Plants) ;
Marine biology ;
Aquatic ecosystems ;
Toxic substances ;
Food chains ;
Carbon 14 ;
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||Partitioning, degradation, and bioaccumulation of the potent biocide tributyltin (TBT) was measured in marine microcosms that included sediment cores from a subtropical seagrass bed (with Thalassia testudinum and associated fauna). Over 3 or 6 weeks, 48 microcosms were dosed with (14)C-labelled TBT, and flushed with flowing seawater between doses. TBT was rapidly removed from the water column, with half times of only 10-20 h. Adsorption onto sediments and grasses was temporary; however, at harvest, the seagrass microcosms contained just 15-20% of the (14)C that was added, and half of this label was in degradation products. The initial attraction between TBT and seagrasses and sediments provided a means for TBT concentration that lead to its accumulation in Fauna; at harvest, 2-6% of the (14)C in microcosms was in animals. Thus, TBT must continue to be viewed as a hazardous compound, and seagrass beds should be considered vectors for distribution of TBT through coastal food chains.
||Pub. in Marine Environmental Research 30, p297-322 1990. Prepared in cooperation with University of West Florida, Pensacola. Sponsored by Environmental Research Lab., Gulf Breeze, FL.
|NTIS Title Notes
||Reprint: Pollutant Dynamics as Influenced by Seagrass Beds: Experiments with Tributyltin in 'Thalassia' Microcosms.
||PC A03/MF A01