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Intermediate Levels of Predation and Nutrient Enrichment Enhance the Activity of Ibuprofen-Degrading Bacteria. | LitMetric

AI Article Synopsis

  • Water is essential but faces threats from organic pollution, especially from emerging contaminants like ibuprofen found in wastewater.
  • Research shows that phosphate levels and predator-prey dynamics influence how bacteria break down ibuprofen in riverbed environments.
  • Moderate levels of nutrients and predation enhance the growth of ibuprofen-degrading bacteria, improving the river's ability to self-purify and highlight the complex interactions within these ecosystems.

Article Abstract

Water is the most indispensable natural resource; yet, organic pollution of freshwater sources is widespread. In recent years, there has been increasing concern over the vast array of emerging organic contaminants (EOCs) in the effluent of wastewater treatment plants (WWTPs). Several of these EOCs are degraded within the pore space of riverbeds by active microbial consortia. However, the mechanisms behind this ecosystem service are largely unknown. Here, we report how phosphate concentration and predator-prey interactions drive the capacity of bacteria to process a model EOC (ibuprofen). The presence of phosphate had a significant positive effect on the population growth rate of an ibuprofen-degrading strain. Thus, when phosphate was present, ibuprofen removal efficiency increased. Moreover, low and medium levels of predation, by a ciliated protozoan, stimulated bacterial population growth. This unimodal effect of predation was lost under high phosphate concentration, resulting in the flattening of the relationships between predator density and population growth of ibuprofen degraders. Our results suggest that moderate nutrient and predation levels promote the growth rate of bacterial degraders and, consequently, the self-purifying capability of the system. These findings enhance our understanding of the mechanisms by which riverbed communities drive the processing of EOCs.

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Source
http://dx.doi.org/10.1007/s00248-022-02109-2DOI Listing

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