EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021

(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)

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5/24/2021  |   2:00 PM - 3:30 PM   |  STREAM MICROBIAL COMMUNITIES AND ECOSYSTEM FUNCTIONING SHOW COMPLEX RESPONSES TO MULTIPLE STRESSORS IN WASTEWATER   |  Virtual Platform

STREAM MICROBIAL COMMUNITIES AND ECOSYSTEM FUNCTIONING SHOW COMPLEX RESPONSES TO MULTIPLE STRESSORS IN WASTEWATER

Inputs of urban wastewater potentially have pervasive impacts on biodiversity and ecosystem services in receiving freshwater habitats. Viewed through multiple disciplinary lenses, we combined field, flume, and laboratory experiments to investigate wastewater effects on microbial communities and organic-matter processing using a standardized decomposition assay. A mensurative field experiment showed that microbial respiration and decomposition rates were positively influenced by wastewater inputs via warming and nutrient enrichment, but with a notable exception: wastewater decreased the activation energy of decomposition, indicating a “slowing” of this fundamental ecosystem process in response to temperature. Next-generation sequencing of microbial communities showed that wastewater altered community structure, with significant compositional turnover and evidence of negative micropollutant influences on fungal richness. A series of experiments demonstrated how negative wastewater effects on ecosystem functioning are ‘masked’ by nutrients and wastewater-borne microbes. Taken together, our results affirm the multiple-stressor paradigm by describing how different aspects of wastewater (i.e., temperature, nutrients, microbes, and micropollutants) jointly influence biodiversity and ecosystem functioning in complex ways. The net increase in respiration rates driven by wastewater inputs have the potential to generate ecosystem ‘disservices’ via greater carbon evasion from streams and rivers.

  • Decomposition
  • Microbial ecology
  • Pollution

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Presenters/Authors

Francis Burdon (), Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden, francis.burdon@slu.se;


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Yaohui Bai (), Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, People's Republic of China, yhbai@rcees.ac.cn;


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Marta Reyes (), Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dubendorf, Switzerland , Marta.Reyes@eawag.ch;


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Manu Tamminen (), Department of Biology, University of Turku, Turku, Finland, mavata@gmail.com;


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Philipp Staudacher (), Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dubendorf, Switzerland , philipp.staudacher@eawag.ch;


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Simon Mangold (), Agroscope, Zurich, Switzerland, simon.mangold@agroscope.admin.ch;


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Heinz Singer (), Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dubendorf, Switzerland , Heinz.Singer@eawag.ch;


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Katja Räsänen (), Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dubendorf, Switzerland , katja.rasanen@eawag.ch;


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Adriano Joss (), Eawag, Swiss Federal Institute of Aquatic Science and Technology, Dubendorf, Switzerland , Adriano.Joss@eawag.ch;


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Scott Tiegs (), Dept. of Biological Sciences, Oakland University, tiegs@oakland.edu;


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Jukka Jokela (), Aquatic Ecology - Eawag, jukka.jokela@eawag.ch;


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Rik Eggen (), Environmental Toxicology - Eawag, rik.eggen@eawag.ch;


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Christian Stamm (), Environmental Chemistry - Eawag, christian.stamm@eawag.ch;


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