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Processes 2016, 4(4), 51; doi:10.3390/pr4040051

Species Coexistence in Nitrifying Chemostats: A Model of Microbial Interactions

INRA, UR50, Laboratoire de Biotechnologie de l’Environnement, Narbonne F-11100, France
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Academic Editor: Hyun-Seob Song
Received: 26 September 2016 / Revised: 5 December 2016 / Accepted: 7 December 2016 / Published: 14 December 2016
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Abstract

In a previous study, the two nitrifying functions (ammonia oxidizing bacteria (AOB) or nitrite-oxidizing bacteria (NOB)) of a nitrification reactor—operated continuously over 525 days with varying inputs—were assigned using a mathematical modeling approach together with the monitoring of bacterial phylotypes. Based on these theoretical identifications, we develop here a chemostat model that does not explicitly include only the resources’ dynamics (different forms of soluble nitrogen) but also explicitly takes into account microbial inter- and intra-species interactions for the four dominant phylotypes detected in the chemostat. A comparison of the models obtained with and without interactions has shown that such interactions permit the coexistence of two competing ammonium-oxidizing bacteria and two competing nitrite-oxidizing bacteria in competition for ammonium and nitrite, respectively. These interactions are analyzed and discussed. View Full-Text
Keywords: competitive exclusion principle; microbial interactions; nitrifying bacteria; coexistence; chemostat models; ecosystem functions competitive exclusion principle; microbial interactions; nitrifying bacteria; coexistence; chemostat models; ecosystem functions
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Dumont, M.; Godon, J.-J.; Harmand, J. Species Coexistence in Nitrifying Chemostats: A Model of Microbial Interactions. Processes 2016, 4, 51.

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