Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Effects of Protozoa on the Fate of Particulate Carbon.
Author Hol, Harvey W. ; Smit, Forrest A. ;
CORP Author National Environmental Research Center, Corvallis, Oreg.
Year Published 1973
Report Number EPA-16050-GJC; 660/3-73-007,; 01117
Stock Number PB-225 143
Additional Subjects ( Protozoa ; Growth) ; ( Carbon ; Protozoa) ; Food chains ; Bacteria ; Aquatic microbiology ; Carbon dioxide ; Ecology ; Biological productivity ; Tetrahymena pyriformis ; Citrobacter
Library Call Number Additional Info Location Last
NTIS  PB-225 143 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/23/1988
Collation 44p
Laboratory studies were designed to define the role of protozoa in the fate of particulate (bacterial) organic carbon. Specific objectives were to measure the effects of selected environmental parameters on protozoan growth rates, to measure organic carbon in bacteria and protozoa, and to quantitate carbon transformation in predator-prey experimental systems. T. Tetrahymena pyriformis altered the amount and form of carbon in the system while growing on bacteria. Of the total organic carbon present at the initiation of the predator-prey experiment (93 mg), 93% was in the bacterial fraction. Within 96 hours, 38% of the carbon was released as CO2; 5% was present as inorganic carbon in the water and the remainder (57%) was present as organic carbon. The organic carbon in the bacterial fraction decreased from 86 to 2 mg within 96 hours, while the carbon in the protozoan biomass increased from 1 to 40 mg. In the bacterial control, 11% of the organic carbon was released as CO2 within 96 hours while negligible amounts of inorganic carbon remained in the water.