Impacts of Tetracycline on Planktonic Bacterial Production in Prairie Aquatic Systems |
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Authors: | Brij Verma Richard D Robarts John V Headley |
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Institution: | (1) Department of Plant Sciences, University of Saskatchewan, 51 Campus Drive, Saskatoon, Saskatchewan, Canada, S7N 5A8;(2) UNEP GEMS/Water Programme Office, Environment Canada, 11 Innovation Boulevard, Saskatoon, Saskatchewan, Canada, S7N 3H5;(3) National Water Research Institute, Environment Canada, 11 Innovation Boulevard, Saskatoon, Saskatchewan, Canada, S7N 3H5 |
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Abstract: | In view of antibiotics being detected in surface waters, experiments were conducted to determine the impacts of tetracycline
on planktonic bacteria in wetland and river waters. The minimum inhibitory concentration (MIC) method is often used to measure
for resistance or susceptibility of microbes to antibiotics with typical concentrations of antibiotics being mg L−1. Moreover, there is the belief that antibiotics in the lower μg L−1 range are unlikely to affect bacteria. We examined this assumption by measuring the effects of a broad range of tetracycline
concentrations on bacterial protein production by the incorporation of l-4,5-3H]leucine method. Tetracycline significantly (P < 0.05) inhibited production in river water bacteria at a “free” concentration of 5 μg L−1, but the inhibition was significant only at 1000 μg L−1 in wetland water. The data indicate that planktonic bacteria can be very sensitive to tetracycline at extremely low concentrations
and that microbial production is seriously affected. |
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