Heterotrophic bacterial production: Relationships to biological and abiological factors in estuarine environments
Ecotoxicological effects of creosote contamination on benthic bacterial communities in the Elizabeth River, Virginia were investigated using both structural an functional microbial parameters. Results indicated that cell specific and total heterotrophic bacterial production parameters were depressed in a dose-dependent manner with increasing sediment PAH concentrations. Toxicity effects upon production were modified by temporal trends associated with temperature as well as spatial sediment characteristics. Of the parameters employed, the tritiated thymidine production assay was found to be the most sensitive for detection of ecotoxicological effects. Bacterial abundance and production were examined during a destratification event in the lower James River, Virginia. Bacterial abundance, although significantly different between stations, did not change over the study. Bacterial production ({sup 3}H-Tdr incorporation) in surface waters was significantly less during the mixed period 187 {mu}g C{center dot}1-1{center dot} d{sup {minus}1} compared to the most stratified state (324{mu}g C{center dot}1-1{center dot} d{sup {minus}1}). Correlations between bacteria and chlorophyll were diminished during the mixed period. Total and flagellate specific grazing rates upon bacteria were reduced during the onset of destratification. Relationships between bacterial and nutrient parameters also indicated a strong influence of destratification. These results indicate that destratification changes trophic interactions within the microbial loop, which are not necessarily reflected in temporal patterns of bacterial abundance. Bacterioplankton production, and ammonium assimilation and remineralization were examined between April and August 1988 in the lower York River, Va.
- Research Organization:
- College of William and Mary, Williamsburg, VA (USA)
- OSTI ID:
- 6369544
- Resource Relation:
- Other Information: Thesis (Ph. D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
BACTERIA
SENSITIVITY
CREOSOTE
TOXICITY
POLYCYCLIC AROMATIC HYDROCARBONS
ECOLOGICAL CONCENTRATION
VIRGINIA
WATER POLLUTION
BENTHOS
CHLOROPHYLL
RIVERS
THYMIDINE
TRACER TECHNIQUES
TRITIUM COMPOUNDS
AQUATIC ORGANISMS
AROMATICS
AZINES
CARBOXYLIC ACIDS
FEDERAL REGION III
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
ISOTOPE APPLICATIONS
MICROORGANISMS
NORTH AMERICA
NUCLEOSIDES
NUCLEOTIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYTOCHROMES
PIGMENTS
POLLUTION
PORPHYRINS
PROTEINS
PYRIMIDINES
RIBOSIDES
STREAMS
SURFACE WATERS
USA
540320* - Environment
Aquatic- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology
540311 - Environment
Aquatic- Basic Studies- Radiometric Techniques- (1990-)