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Title: Primary productivity, heterotrophy, metabolic indicators of stress and interactions in algal-bacterial mat communities affected by a fluctuating thermal regime

Abstract

Thermal habitats in effluent cooling waters from production nuclear reactors at the Savannah River Plant are unlike natural thermal habitats in that reactor operations are periodically halted, exposing the organisms growing in these thermal habitats to ambient temperatures for unpredictable lengths of time. Rates of primary production, glucose heterotrophy, and the composition of algal-bacterial mat communities growing along a thermal gradient from about 50 to 35/sup 0/C during periods of reactor operation were studied. Cyanobacteria were the only photoautotrophs in mat communities above 40/sup 0/C while cyanobacteria and eucaryotic algae comprised the photoautotrophic component of mat communities below 40/sup 0/C. The heterotrophic component of these communities above 40/sup 0/C was made up of stenothermic and eurythermic thermophilic bacteria while both eurythermic thermophiles and mesophilic bacteria were found in communities below 40/sup 0/C. Net CO/sub 2/-fixation rates during thermal conditions dropped after initial exposure to ambient temperatures. After prolonged exposure of the thermal communities to ambient temperatures, adaptation and colonization by mesophilic algae occurred. Rates of glucose utilization under varying degrees of thermal influence suggested that the heterotrophic component may not have been optimally adapted to thermal conditions. During periods of changing thermal conditions, an increase in the percentage extracellular releasemore » of photosynthetically fixed /sup 14/CO/sub 2/ by cyanobacteria and algae and an increase in the percentage of glucose mineralized (respired) by the heterotrophic component of the mat communities was observed. Results of temperature shift experiments indicated that the short-term response of the photoautotrophic component of these communities to thermal stress was an increase in the percentage of photosynthate released extracellularly. (ERB)« less

Authors:
Publication Date:
Research Org.:
Rensselaer Polytechnic Inst., Troy, NY (United States)
OSTI Identifier:
5566493
Report Number(s):
DP-MS-80-14
TRN: 80-007624
DOE Contract Number:  
EY-76-C-09-0001
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis. Portions of document are illegible
Country of Publication:
United States
Language:
English
Subject:
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.; 54 ENVIRONMENTAL SCIENCES; 59 BASIC BIOLOGICAL SCIENCES; 22 GENERAL STUDIES OF NUCLEAR REACTORS; ALGAE; METABOLISM; PHOTOSYNTHESIS; POPULATION DYNAMICS; PRODUCTIVITY; BACTERIA; TEMPERATURE EFFECTS; PRODUCTION REACTORS; THERMAL EFFLUENTS; SURFACE WATERS; THERMAL POLLUTION; BIOLOGICAL EFFECTS; AMBIENT TEMPERATURE; AQUATIC ECOSYSTEMS; EXPERIMENTAL DATA; GLUCOSE; ISOLATED VALUES; MEDIUM TEMPERATURE; SAVANNAH RIVER PLANT; TEMPERATURE GRADIENTS; WATER POLLUTION; ALDEHYDES; CARBOHYDRATES; CHEMICAL REACTIONS; DATA; DATA FORMS; ECOSYSTEMS; HEXOSES; INFORMATION; MICROORGANISMS; MONOSACCHARIDES; NATIONAL ORGANIZATIONS; NUMERICAL DATA; ORGANIC COMPOUNDS; PHOTOCHEMICAL REACTIONS; PLANTS; POLLUTION; REACTORS; SACCHARIDES; SYNTHESIS; US AEC; US DOE; US ERDA; US ORGANIZATIONS; 560202* - Thermal Effects- Microorganisms- (1987); 520400 - Environment, Aquatic- Thermal Effluents Monitoring & Transport- (-1989); 550701 - Microbiology- Tracer Techniques; 220503 - Nuclear Reactor Technology- Environmental Aspects- Chemical & Thermal Effluents

Citation Formats

Tison, D. L. Primary productivity, heterotrophy, metabolic indicators of stress and interactions in algal-bacterial mat communities affected by a fluctuating thermal regime. United States: N. p., 1980. Web. doi:10.2172/5566493.
Tison, D. L. Primary productivity, heterotrophy, metabolic indicators of stress and interactions in algal-bacterial mat communities affected by a fluctuating thermal regime. United States. https://doi.org/10.2172/5566493
Tison, D. L. Tue . "Primary productivity, heterotrophy, metabolic indicators of stress and interactions in algal-bacterial mat communities affected by a fluctuating thermal regime". United States. https://doi.org/10.2172/5566493. https://www.osti.gov/servlets/purl/5566493.
@article{osti_5566493,
title = {Primary productivity, heterotrophy, metabolic indicators of stress and interactions in algal-bacterial mat communities affected by a fluctuating thermal regime},
author = {Tison, D. L.},
abstractNote = {Thermal habitats in effluent cooling waters from production nuclear reactors at the Savannah River Plant are unlike natural thermal habitats in that reactor operations are periodically halted, exposing the organisms growing in these thermal habitats to ambient temperatures for unpredictable lengths of time. Rates of primary production, glucose heterotrophy, and the composition of algal-bacterial mat communities growing along a thermal gradient from about 50 to 35/sup 0/C during periods of reactor operation were studied. Cyanobacteria were the only photoautotrophs in mat communities above 40/sup 0/C while cyanobacteria and eucaryotic algae comprised the photoautotrophic component of mat communities below 40/sup 0/C. The heterotrophic component of these communities above 40/sup 0/C was made up of stenothermic and eurythermic thermophilic bacteria while both eurythermic thermophiles and mesophilic bacteria were found in communities below 40/sup 0/C. Net CO/sub 2/-fixation rates during thermal conditions dropped after initial exposure to ambient temperatures. After prolonged exposure of the thermal communities to ambient temperatures, adaptation and colonization by mesophilic algae occurred. Rates of glucose utilization under varying degrees of thermal influence suggested that the heterotrophic component may not have been optimally adapted to thermal conditions. During periods of changing thermal conditions, an increase in the percentage extracellular release of photosynthetically fixed /sup 14/CO/sub 2/ by cyanobacteria and algae and an increase in the percentage of glucose mineralized (respired) by the heterotrophic component of the mat communities was observed. Results of temperature shift experiments indicated that the short-term response of the photoautotrophic component of these communities to thermal stress was an increase in the percentage of photosynthate released extracellularly. (ERB)},
doi = {10.2172/5566493},
url = {https://www.osti.gov/biblio/5566493}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {1}
}