||Adaptation of Aquatic Microbial Communities to Hg(2+) Stress.
Barkay, T. ;
||Environmental Research Lab., Gulf Breeze, FL.
Aquatic microbiology ;
Water pollution ;
Fresh water biology ;
Mercury inorganic compounds ;
Biological stress ;
Biological adaptation ;
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||The mechanism of adaptation to Hg(2+) in four aquatic habitats was studied by correlating microbially mediated Hg(2+) volatilization with the adaptive state of the exposed communities. Structural and functional parameters indicated that adaptation of all four communities was stimulated by exposure to Hg(2+). In saline water communities, adaptation was associated with rapid volatilization after an initial lag period. The mechanism, however, did not promote adaptation in a freshwater environment, where Hg(2+) volatilized slowly, regardless of the adaptive state of the microbial community. Distribution of the mer operon among representative colonies of the communities was not related to adaptation to Hg(2+). Thus, although volatilization is a mechanism which enables some microbial communities to sustain their functions in Hg(2+) stressed environments, it is not coded for by the gene system that mediates the mechanism in pure cultures.
||Pub. in Applied and Environmental Microbiology, v53 n12 p2725-2732 Dec 87.
|NTIS Title Notes
||Reprint: Adaptation of Aquatic Microbial Communities to Hg(2+) Stress.
|PUB Date Free Form
||57H; 57K; 47D
||PC A02/MF A01