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Appl Environ Microbiol. 1983 April; 45(4): 1196-1201
Copyright © 1983, American Society for Microbiology. All Rights Reserved.

Grazing, Growth, and Ammonium Excretion Rates of a Heterotrophic Microflagellate Fed with Four Species of Bacteria

Barry F. Sherr, Evelyn B. Sherr and Thomas Berman

Kinneret Limnological Laboratory, Tiberias, Israel

ABSTRACT

We studied aspects of the population growth of a microflagellate, Monas sp., isolated from Lake Kinneret, Israel. The protozoan growth rates, rates of ingestion of bacteria, and final population yields generally increased with increasing bacterial concentrations, although the exact relationship varied depending on the species of bacteria used as food. Grazing rates decreased hyperbolically with increasing food density. Gross growth efficiencies and ammonia excretion rates were similar over a range of food densities among the four species of bacteria. Population doubling times and ammonia excretion rates were lowest, and growth efficiencies were highest, at temperatures between 18 and 24°C. Under optimum conditions, the microflagellates had average population doubling times of 5.0 to 7.8 h, average growth efficiencies of 23.7 to 48.7%, and average ammonia excretion rates of 0.76 to 1.23 µmol of NH₄⁺ per mg (dry wt) per h.

Present address: University of Georgia Marine Institute, Sapelo Island, GA 31327.

Contribution 431 of Israel Oceanographic & Limnological Research, Inc., and 485 of the University of Georgia Marine Institute.

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