Adaptation of aquatic microbial communities to Hg/sup 2 +/ stress
Journal Article
·
· Appl. Environ. Microbiol.; (United States)
OSTI ID:5379568
The mechanism of adaptation to Hg/sup 2 +/ in four aquatic habitats was studied by correlating microbially mediated Hg/sup 2 +/ volatilization with the adaptive state of the exposed communities. Community diversity, heterotrophic activity, and Hg/sup 2 +/ resistance measurements indicated that adaptation of all four communities was stimulated by preexposure to Hg/sup 2 +/. In saline water communities, adaptation was associated with rapid volatilization after an initial lag period. This mechanism, however, did not promote adaptation in a freshwater sample, in which Hg/sup 2 +/ was volatilized slowly, regardless of the resistance level of the microbial community. Distribution of the mer operon among representative colonies of the communities was not related to adaptation to Hg/sup 2 +/. Thus, although volatilization enabled some microbial communities to sustain their functions in Hg/sup 2 +/-stressed environments, it was not mediated by the genes that serve as a model system in Molecular studies of bacterial resistance to mercurials.
- Research Organization:
- Environmental Protection Agency, Gulf Breeze, FL
- OSTI ID:
- 5379568
- Journal Information:
- Appl. Environ. Microbiol.; (United States), Journal Name: Appl. Environ. Microbiol.; (United States) Vol. 53:12; ISSN AEMID
- Country of Publication:
- United States
- Language:
- English
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Fri Jun 01 00:00:00 EDT 1990
· Applied and Environmental Microbiology; (USA)
·
OSTI ID:6651551
Related Subjects
550200 -- Biochemistry
560300* -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AQUATIC ORGANISMS
BIOLOGICAL ADAPTATION
BIOLOGICAL STRESS
CATIONS
CHARGED PARTICLES
EVAPORATION
GENE OPERONS
IONS
MERCURY COMPOUNDS
MICROORGANISMS
MOLECULAR BIOLOGY
PHASE TRANSFORMATIONS
POPULATION DYNAMICS
SPECIES DIVERSITY
TOXICITY
560300* -- Chemicals Metabolism & Toxicology
59 BASIC BIOLOGICAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AQUATIC ORGANISMS
BIOLOGICAL ADAPTATION
BIOLOGICAL STRESS
CATIONS
CHARGED PARTICLES
EVAPORATION
GENE OPERONS
IONS
MERCURY COMPOUNDS
MICROORGANISMS
MOLECULAR BIOLOGY
PHASE TRANSFORMATIONS
POPULATION DYNAMICS
SPECIES DIVERSITY
TOXICITY