Microbiology and chemistry of acid lakes in Florida

Thesis/Dissertation · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6416324

James, R T

Effects of acid precipitation, low pH, and dissolved organic carbon (DOC), on lake chemistry and microbiology were investigated spatially - in 5 clear and 5 dark lakes, temporally - in 3 clear and 2 dark lakes over a 2 year period, and experimentally - in enclosures to investigate effects of various acid manipulations. Spatial studies found significant positive relationships among DOC, chlorophyll a, pH, and bacterial densities. Using all data, a subsidy stress curve was observed between DOC and bacteria, further indicating toxicity of DOC at high concentrations. Temporal studies found no consistent or significant relationships between pH and bacterial densities, bacterial biomass, chlorophyll a, and protozoans. Clear lake pH was negatively related to rainfall and acid deposition. Acid deposition was also negatively related to glucose assimilation by surface water bacteria, indicating a stress on bacteria. Experimental studies examined effects of pulsed and gradual acid additions on microbial communities of a clear and dark lake. Bacteria biomass and density did not decline in response to any acid addition. Decrease uptake of both glucose and thymidine was observed in the clear-lake pulsed treatment. Chlorophyll a and protozoans declined in the dark lake pulsed treatment but not in others, indicating that pulsed additions of acid were more detrimental to the microbial community than gradual additions to the same pH.

• Research Organization: Georgia Univ., Athens, GA (USA)
• OSTI ID: 6416324
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010900 -- Coal
Lignite
& Peat-- Environmental Aspects
54 ENVIRONMENTAL SCIENCES
540320* -- Environment
Aquatic-- Chemicals Monitoring & Transport-- (1990-)
560300 -- Chemicals Metabolism & Toxicology
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ACID RAIN
ACIDIFICATION
AIR POLLUTION
ALDEHYDES
ATMOSPHERIC PRECIPITATIONS
AZINES
BACTERIA
CARBOHYDRATES
CARBOXYLIC ACIDS
CHEMISTRY
CHLOROPHYLL
ENVIRONMENTAL EFFECTS
FEDERAL REGION IV
FLORIDA
GLUCOSE
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HEXOSES
LAKES
MICROORGANISMS
MONOSACCHARIDES
NORTH AMERICA
NUCLEOSIDES
NUCLEOTIDES
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC MATTER
ORGANIC NITROGEN COMPOUNDS
PH VALUE
PHYTOCHROMES
PIGMENTS
POLLUTION
PORPHYRINS
PROTEINS
PYRIMIDINES
RAIN
RIBOSIDES
SACCHARIDES
SURFACE WATERS
THYMIDINE
TOXICITY
USA
WATER CHEMISTRY
WATER POLLUTION