Enteropathogen survival in soil from different land-uses is predominantly regulated by microbial community composition
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Emma L. Moynihan, Karl G. Richards, Fiona P. Brennan, Sean F. Tyrrel, Karl Ritz, Enteropathogen survival in soil from different land-uses is predominantly regulated by microbial community composition. Applied Soil Ecology, Volume 89, May 2015, Pages 76-84. DOI: 10.1016/j.apsoil.2015.01.011Abstract
Microbial enteropathogens can enter the environment via landspreading of animal slurries and manures. Biotic interactions with the soil microbial community can contribute to their subsequent decay. This study aimed to determine the relative impact of biotic, specifically microbial community structure, and physico-chemical properties associated with soils derived from 12 contrasting land-uses on enteropathogen survival. Phenotypic profiles of microbial communities (via phospholipid fatty acid (PLFA) profiling), and total biomass (by fumigation-extraction), in the soils were determined, as well as a range of physicochemical properties. The persistence of Salmonella Dublin, Listeria monocytogenes, and Escherichia coli was measured over 110 days within soil microcosms. Physicochemical and biotic data were used in stepwise regression analysis to determine the predominant factor related to pathogen-specific death rates. Phenotypic structure, associated with a diverse range of constituent PLFAs, was identified as the most significant factor in pathogen decay for S. Dublin, L. monocytogenes, non-toxigenic E. coli O157 but not for environmentally-persistent E. coli. This demonstrates the importance of entire community-scale interactions in pathogen suppression, and that such interactions are context-specific.Funder
Teagasc Post-doctoral Fellowship Scheme; Teagasc Walsh Fellowship Programmeae974a485f413a2113503eed53cd6c53
http://dx.doi.org/10.1016/j.apsoil.2015.01.011