Effect of sulfonamide antibiotics on microbial diversity and activity in a Californian Mollic Haploxeralf

This study provides insight into the combined effect of three sulfonamides typically used in dairy farms

Iris R. Gutiérrez

2010

The use of antibiotics in livestock farming is a worldwide practice
The soil microbial community was affected by sulfonamides even at a relatively low concentration, this soil receives regular input of manure that contains several antibiotics
The aim of this study is to determine the effect of sulfonamide antibiotics on structural diversity and function of the soil microbial community
The soil used receives regular input of manure that contains several antibiotics and the soil microbial community is expected to be to some extent adapted to the presence of antibiotics, the microbial community was affected by sulfonamides even at relatively low concentrations
Further research is needed on long-tenn effects of sulfonamides on the soil microbial community, on the effect of repeated inputs of sulfonamides on soil microorganisms, and on the adaptation of the soil microbial community under the management practices typical for dairy farms like the one studied here
Up to 90% of antibiotics that are fed to livestock are excreted unaltered or as metabolites, and they are detectable in manure, soil, and groundwater
To better establish cause and effect relationships over time, the bioavailable sulfonamide concentration should be determined in conjunction with soil microbial parameters
No effect of sulfonamides on enzymatic activIties was observed when soil microbial growth was not stimulated by the addition of available carbon

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