17a-Estradiol limits the impact of ibuprofen upon community respiration by streambed biofilms in a sub-urban stream

William Hunter, Peter McClean

Research output: Other contribution


Pharmaceuticals compounds such as the non-steroidal anti-inflammatory drug ibuprofen and the artificial estrogen 17a-estradiol are contaminants of emerging concern in freshwater systems. Globally, the use of these compounds is growing by around ~3 % per year, yet we know little about how interactions between different pharmaceuticals may affect aquatic ecosystems. Here we test how interactions between ibuprofen and 17a-estradiol affect the growth and community metabolism of streambed biofilms. We used contaminant exposure experiments to quantify how these compounds affected biofilm growth (biomass), respiration and gross primary production, both individually and in combination. Within our study, we found no effects of either ibuprofen or 17a-estradiol on biofilm biomass (using ash free dry mass as a proxy) or gross primary production. Ibuprofen significantly reduced biofilm respiration. However, concomitant exposure to 17a-estradiol counteracted the depressive effects ibuprofen upon biofilm metabolism. Our study, thus, demonstrates that interactions between pharmaceuticals in the environment may have complex effects upon microbial contributions to aquatic ecosystem functioning.
Original languageEnglish
TypePre-print manuscript
Media of outputOnline
Publication statusPublished - 30 Jul 2019

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  • Activities

    • 1 Oral presentation

    PharmaTea: Assessing ecological sensitivity to pharmaceutical pollution using the Tea Bag Index

    William Ross Hunter (Speaker), & Judith Maria Sarneel (Speaker)

    11 Dec 2019

    Activity: Talk or presentationOral presentation

    Research Output

    17α-ethynylestradiol (EE2) limits the impact of ibuprofen upon respiration by streambed biofilms in a sub-urban stream

    McClean, P. & Hunter, W., 17 Jul 2020, In : Environmental Science and Pollution Research. 27, p. 37149-37154 6 p.

    Research output: Contribution to journalArticle

    Open Access
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