Behaviour of mixed populations of halophilic bacteria in continuous cultures
- 1 November 1980
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Microbiology
- Vol. 26 (11) , 1259-1263
- https://doi.org/10.1139/m80-210
Abstract
Two main physiological groups of bacteria are known which are adapted to high saline environments, moderate and extreme halophiles. To clarify some aspects of the competition between these 2 groups in their natural habitats, continuous cultures were used to provide a changing spectrum of conditions of salt concentration, temperature and nutrient concentration (dilution rate). The effects of these parameters on natural solar saltern populations were studied. Complex media were used to increase the range of competing microorganisms. Nineteen strains of halophilic bacteria were isolated and studied with respect to their growth response at different salt concentrations. The temperature seemed to be the decisive factor within the range of salt concentrations studied (20-30%, wt/vol), the moderate halophiles being favored by low temperatures. Within this group, motile, gram-negative rods and spiral forms were the predominant morphological types. In general, microorganisms that showed high growth rates in batch cultures predominated in continuous cultures with high dilution rates (high nutrient concentrations); those that grew slowly in batch cultures predominated in cultures with low dilution rates.This publication has 3 references indexed in Scilit:
- Spirochaeta halophila sp. n., a facultative anaerobe from a high-salinity pondArchiv für Mikrobiologie, 1976
- Enrichments of aquatic bacteria in continuous cultureArchiv für Mikrobiologie, 1967
- AN IMPROVED TECHNIQUE FOR STAINING RED HALOPHILIC BACTERIAJournal of Bacteriology, 1955