Journal
ENVIRONMENTAL MICROBIOLOGY
Volume 19, Issue 7, Pages 2785-2793Publisher
WILEY
DOI: 10.1111/1462-2920.13792
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Funding
- MERMAID (An Initial Training Network - People Programme - Marie Sklodowska-Curie Actions- of the European Union's Seventh Framework Programme FP7/under REA grant) [607492]
- MERMAID (An Initial Training Network - People Programme - Marie Sklodowska-Curie Actions- of the European Union's Seventh Framework Programme FP7 under REA grant) [607492]
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Community assembly is a central topic in microbial ecology: how do assembly processes interact and what is the relative contribution of stochasticity anddeterminism? Here, we exposed replicate flow-through biofilm systems, fed with nitrite-supplemented tap water, to continuous immigration from a source community, present in the tap water, to determine the extent of selection and neutral processes in newly assembled biofilm communities at both the community and the functional guild (of nitrite-oxidizing bacteria, NOB) levels. The community composition of biofilms assembled under low and high nitrite loading was described after 40 days of complete nitrite removal. The total community assembly, as well as the NOB guild assembly werelargely governed by a combination of deterministic and stochastic processes. Furthermore, we observed deterministic enrichment of certain types of NOB in the biofilms. Specifically, elevated nitrite loading selected for a single Nitrotoga representative, while lower nitrite conditions selected for a number of Nitrospira. Therefore, even when focusing on ecologically coherent ensembles, assembly is the result of complex stochastic and deterministic processes that can only be interrogated by observing multiple assemblies under controlled conditions.
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