Abstract
Competition experiments between Chromatium vinosum and Chlorobium limicola in sulfide-limited continuous culture under photolithoautotrophic conditions resulted in the coexistence of both organisms. The ratio between the two bacteria was dilution-rate as well as pH dependent. The observed coexistence can be explained as a hitherto not reported form of dual substrate limitation. The two substrates involved are the electron donors sulfide (growth-limiting substrate in the reservoir vessel) and extracellular elemental sulfur (formed by Chlorobium as a result of sulfide oxidation). It is argued that, although Chlorobium may have the better affinity for both substrates involved, Chromatium can compete successfully on the basis of its intracellular storage of sulfur. Ecological implication of the observed coexistence with respect to natural blooms are discussed.
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Abbreviations
- Bchl:
-
bacteriochlorophyll
- me:
-
milliequivalent
- D:
-
dilution rate
References
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van Gemerden, H., Beeftink, H.H. Coexistence of Chlorobium and Chromatium in a sulfide-limited continuous culture. Arch. Microbiol. 129, 32–34 (1981). https://doi.org/10.1007/BF00417175
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DOI: https://doi.org/10.1007/BF00417175