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Anammox Bioreactor DNRA Destabilization Community

Community ID CommunityMech:000244
Ecological State PERTURBED
Environment laboratory anammox bioreactor
ENVO:01001405

A laboratory-scale anaerobic ammonium oxidation (anammox) bioreactor community followed from inoculation through a performance destabilization event and back to robust steady-state operation, characterized by metagenomics. Metabolic analyses showed selection for nutrient-acquisition capacities in the core community. Dissimilatory nitrate reduction to ammonium (DNRA) was the primary nitrogen-removal pathway that competed with anammox, and increased replication of DNRA-capable bacteria out-competed anammox bacteria, causing the loss of nitrogen-removal capacity. The DNRA-capable bacteria were closely associated with the anammox bacterium and are considered part of the core microbial community, underscoring how bacteria that are otherwise core members can be detrimental.

Taxonomy

Taxon Ontology ID Functional Roles Abundance
anammox bacterium NCBITaxon:67854
PRIMARY_DEGRADER
DOMINANT
  • PMID:31980038 - SUPPORT (IN_VITRO)
    "out-competition of anammox bacteria, and the loss of the bioreactor's nitrogen removal capacity"
dissimilatory nitrate reducing (DNRA) bacteria NCBITaxon:2
PRIMARY_DEGRADER CROSS_FEEDER
N/A
  • PMID:31980038 - SUPPORT (IN_VITRO)
    "Increased replication of bacteria capable of DNRA led to the out-competition of anammox bacteria"

Ecological Interactions

Ecological interaction network for Anammox Bioreactor DNRA Destabilization Community Bipartite graph where circle nodes represent taxa and colored rectangles represent ecological interactions (cross-feeding, mutualism, syntrophy, competition, commensalism).
Taxon
Cross-feeding
Mutualism
Syntrophy
Competition
Commensalism
Niche partitioning
Colonization facilitation
Strain competition
Predation

DNRA Competes with Anammox for Nitrogen Removal

COMPETITION

Source Taxon: dissimilatory nitrate reducing (DNRA) bacteria

Target Taxon: anammox bacterium

Metabolites: nitrate (CHEBI:17632), ammonium (CHEBI:28938)

Biological Processes:

  • nitrogen compound metabolic process (GO:0006807)

Evidence

  • PMID:31980038 - SUPPORT (IN_VITRO)
    "Dissimilatory nitrate reduction to ammonium (DNRA) was the primary nitrogen removal pathway that competed with anammox"

Nutrient Acquisition Selects Core Community Members

COMMENSALISM

Evidence

  • PMID:31980038 - SUPPORT (IN_VITRO)
    "nutrient acquisition from the environment is selected for in the anammox community"

External Resources

Name Repository Resource ID
Primary publication for the anammox/DNRA destabilization community
PubMed record for the Keren et al. 2020 Microbiome paper. 		OTHER PMID:31980038
  • PMID:31980038 - SUPPORT (IN_VITRO)
    "Increased replication of dissimilatory nitrate-reducing bacteria leads to decreased anammox bioreactor performance"
DOI landing page
DOI link to the Microbiome paper. 		OTHER doi:10.1186/s40168-020-0786-3

Environmental Factors

Factor Value Unit
Bioreactor performance state stable -> destabilized -> recovered N/A
  • PMID:31980038 - SUPPORT (IN_VITRO)
    "from inoculation, through a performance destabilization event, to robust steady-state performance"