Interactions of Tetrahymena pyriformis, Escherichia coli, Azotobacter vinelandii , and Glucose in a Minimal Medium

Author:

Jost J. L.12,Drake J. F.12,Fredrickson A. G.12,Tsuchiya H. M.12

Affiliation:

1. Department of Chemical Engineering and Materials Science, University of Minnesota, Minneapolis, Minnesota 55455

2. Department of Microbiology, University of Minnesota, Minneapolis, Minnesota 55455

Abstract

A study was made of the food web formed from a protozoon, two bacteria, and a glucose minimal medium in chemostat culture. The system was also divided into simpler parts, first by omitting the protozoon to obtain a competition system, and then by omitting one or the other of the bacteria to obtain two food chains. In the competition studies, one bacterium was displaced by the other at all holding times used. In the food chain studies, sustained oscillations of the population densities of predator and prey developed at short holding times, and then changed to damped oscillations at longer holding times. In addition, the level of residual glucose remained high at long holding times. A new model of microbial growth is necessary to explain these results. In the food web studies, predation of the protozoon on the two bacteria stabilized the competition between the latter and allowed their coexistence in the same habitat. Thus, Gause's principle was circumvented.

Publisher

American Society for Microbiology

Subject

Molecular Biology,Microbiology

Reference17 articles.

1. Microbial interactions in continuous culture;Bungay H. R.;Advan. Appl. Microbiol.,1968

2. The influence of nitrogen gas upon the organic catalysis of nitrogen fixation by Azotobacter;Burk D.;J. Phys. Chem.,1930

3. Continuous monoxenic culture of Tetrahymena pyriform is;Curds C. R.;J. Gen. Microbiol.,1971

4. DeBary A. 1879. Die Erscheinung der Symbiose. Trubner Strassburg.

5. Gause G. F. 1934. The struggle for existence. Williams & Wilkins Co. Baltimore.

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