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Background  Communities of microorganisms control the rates of key biogeochemical cycles, and are important for biotechnology, bioremediation, and industrial microbiological processes. For this reason, we constructed a model microbial community comprised of three species dependent on trophic interactions. The three species microbial community was comprised of  Clostridium cellulolyticum ,  Desulfovibrio vulgaris  Hildenborough, and  Geobacter sulfurreducens  and was grown under continuous culture conditions. Cellobiose served as the carbon and energy source for  C. cellulolyticum , whereas  D. vulgaris  and  G. sulfurreducens  derived carbon and energy from the metabolic products of cellobiose fermentation and were provided with sulfate and fumarate respectively as electron acceptors.    Results  qPCR monitoring of the culture revealed  C. cellulolyticum  to be dominant as expected and confirmed the presence of  D. vulgaris  and  G. sulfurreducens . Proposed metabolic modeling of carbon and electron flow of the three-species community indicated that the growth of  C. cellulolyticum  and  D. vulgaris  were electron donor limited whereas  G. sulfurreducens  was electron acceptor limited.    Conclusions  The results demonstrate that  C. cellulolyticum ,  D. vulgaris , and  G. sulfurreducens  can be grown in coculture in a continuous culture system in which  D. vulgaris  and  G. sulfurreducens  are dependent upon the metabolic byproducts of  C. cellulolyticum  for nutrients. This represents a step towards developing a tractable model ecosystem comprised of members representing the functional groups of a trophic network.

bmc microbiology

Establishment and metabolic analysis of a model microbial community for understanding trophic and electron accepting interactions of subsurface anaerobic environments