||Acclimation of Aquatic Microbial Communities to Hg(II) and CH3Hg(+) in Polluted Freshwater Ponds.
Liebert, C. A. ;
Barkay, T. ;
Turner, R. R. ;
||Environmental Research Lab., Gulf Breeze, FL. ;Oak Ridge National Lab., TN. Environmental Sciences Div. ;Technical Resources, Inc., Gulf Breeze, FL.
Aquatic microbiology ;
Water pollution effects ;
Mercury organic compounds ;
Environmental effects ;
In-situ processing ;
Toxic tolerances ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
||The relationship of mercury resistance to the concentration and chemical speciation of mercurial compounds was evaluated for microbial communities of mercury-polluted and control waters. Methodologies based on the direct viable counting (DVC) method were developed to enumerate mercury-resistant communities. Elevated tolerance to Hg(II) was observed for the microbial community of one mercury polluted pond as compared to the community of control waters. These results suggest an in situ acclimation to Hg(II). The results of the methylmercury resistance-DVC assay suggested that minimal acclimation to CH3Hg(+) occurred since similar concentrations of CH3HgCl inhibited growth of 50% of organisms in both the control and polluted communities. Analyses of different mercury species in pond waters suggested that total mercury, but not CH3Hg(+) concentrations, approached toxic levels in the polluted ponds. Thus, microbial acclimation was specific to the chemical species of mercury that were present in the water at high enough concentration to cause toxic effects. (Copyright (c) Springer-Verlag New York Inc. 1991.)
||Pub. in Microbial Ecology, v21 p139-149 1991. See also PB89-237176. Prepared in cooperation with Oak Ridge National Lab., TN. Environmental Sciences Div., and Technical Resources, Inc., Gulf Breeze, FL.
|NTIS Title Notes
||Reprint: Acclimation of Aquatic Microbial Communities to Hg(II) and CH3Hg(+) in Polluted Freshwater Ponds.
||68D; 57Y; 57K
||PC A03/MF A01