The effect of agrochemicals on indicator bacteria densities in outdoor mesocosms

Environmental Microbiology
Zachery R StaleyValerie J Harwood

Abstract

Water bodies, which are monitored for microbial water quality by quantification of faecal indicator organisms (IOs), can contain various zoonotic pathogens contributed by livestock waste and other sources. Sediments can serve as reservoirs of IOs and other enteric microorganisms, including pathogens. Agrochemicals may influence the survival of these microorganisms in water bodies impacted by livestock waste by enhancing or reducing their survival. Complex, 1100 l, freshwater mesocosms containing leaf litter, zooplankton, periphyton, phytoplankton, and invertebrate and vertebrate animals were used to investigate the response of Escherichia coli and enterococci to agrochemicals. Replicate tanks were treated with atrazine, malathion, chlorothalonil and inorganic fertilizer, either alone at 1× or 2× their expected environmental concentrations (EECs) or in pair-wise combinations at their EECs. IOs inoculated in sediment (∼10⁴ cfu per 100 ml) were enumerated over 28 days. IOs generally declined over time, but manova revealed that addition of fertilizer and atrazine resulted in significantly greater IO densities. Malathion, chlorothalonil and agrochemical concentration (1× vs 2×) did not significantly affect IO densities and no signif...Continue Reading

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Citations

Nov 23, 2013·Proceedings. Biological Sciences·Jason R RohrLynn B Martin
Sep 11, 2012·Applied and Environmental Microbiology·Zachery R StaleyValerie J Harwood
Oct 18, 2011·Applied and Environmental Microbiology·Zachery R StaleyValerie J Harwood
Nov 14, 2015·Critical Reviews in Toxicology·Zachery R StaleyJason R Rohr
Jan 1, 2014·Ecological Applications : a Publication of the Ecological Society of America·Zachery R StaleyValerie J Harwood
Oct 4, 2019·Microbiology and Molecular Biology Reviews : MMBR·Asja KorajkicValerie J Harwood

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