Composite FISH image of activated sludge. Yellow = "Competibacteraceae"; Blue = "Ca. Accumulibacter"; Green = other cells. Scale bar = 10 microns. - Source:1Aerobic heterotroph
In situ behaviour is consistent with the GAO phenotype. Thought to compete with the PAO for resources with their proliferation at the theoretical expense of EBPR efficiency 2 3. Nitrate, but not nitrite, is utilized as an electron acceptor, indicating an inability for denitrification 2.
 McIlroy SJ (2010) Phylogenetic Diversity and Ecophysiology of Alphaproteobacterial Glycogen Accumulating Organisms in Enhanced Biological Phosphorus Removal Activated Sludge Systems. PhD Thesis La Trobe University. - Mcilroy -
 Kong, Xia, Nielsen, Nielsen (2006): Ecophysiology of a group of uncultured Gammaproteobacterial glycogen-accumulating organisms in full-scale enhanced biological phosphorus removal wastewater treatment plants. Environ. Microbiol. 8 (3): 479-89. doi:10.1111/j.1462-2920.2005.00914.x
 Blackall, Crocetti, Saunders, Bond (2002): A review and update of the microbiology of enhanced biological phosphorus removal in wastewater treatment plants. Antonie Van Leeuwenhoek 81 (1-4): 681-91.
 McIlroy, Nittami, Kanai, Fukuda, Saunders, Nielsen, et al. (2015): Re-appraisal of the phylogeny and fluorescence in situ hybridization probes for the analysis of the Competibacteraceae in wastewater treatment systems. Environ Microbiol Rep 7 (2): 166-74. doi:10.1111/1758-2229.12215
 Kong, Ong, Ng, Liu (2002): Diversity and distribution of a deeply branched novel proteobacterial group found in anaerobic-aerobic activated sludge processes. Environ. Microbiol. 4 (11): 753-7.