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Metabolomics insight into the influence of environmental factors in responses of freshwater biofilms to the model herbicide diuron

  • ECOTOX, Aquatic and Terrestrial Ecotoxicology Considering the Soil: Water Continuum in the Anthropocene Context
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Abstract

Freshwater biofilms have been increasingly used during the last decade in ecotoxicology due to their ecological relevance to assess the effect(s) of environmental stress at the community level. Despite growing knowledge about the effect of various stressors on the structure and the function of these microbial communities, a strong research effort is still required to better understand their response to chemical stress and the influence of environmental stressors in this response. To tackle this challenge, untargeted metabolomics is an approach of choice because of its capacity to give an integrative picture of the exposure to multiple stress and associated effect as well as identifying the molecular pathways involved in these responses. In this context, the present study aimed to explore the use of an untargeted metabolomics approach to unravel at the molecular/biochemical level the response of the whole biofilm to chemical stress and the influence of various environmental factors in this response. To this end, archived high-resolution mass spectrometry data from previous experiments at our laboratory on the effect of the model photosynthesis inhibitor diuron on freshwater biofilm were investigated by using innovative solutions for OMICs data (e.g., DRomics) and more usual chemometric approaches (multivariate and univariate statistical analyses). The results showed a faster (1 min) and more sensitive response of the metabolome to diuron than usual functional descriptors, including photosynthesis. Also, the metabolomics response to diuron resulted from metabolites following various trends (increasing, decreasing, U/bell shape) along increasing concentration and time. This metabolomics response was influenced by the temperature, photoperiod, and flow. A focus on a plant-specific omega-3 (eicosapentaenoic acid) playing a key role in the trophic chain highlighted the potential relevance of metabolomics approach to establish the link between molecular alteration and ecosystem structure/functioning impairment but also how complex is the response and the influence of all the tested factors on this response at the metabolomics level. Altogether, our results underline that more fundamental researches are needed to decipher the metabolomics response of freshwater biofilm to chemical stress and its link with physiological, structural, and functional responses toward the unraveling of adverse outcome pathways (AOP) for key ecosystem functions (e.g., primary production).

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Availability of data and materials

Although most of the data generated or analyzed during this study are included in the manuscript and the supplementary material, the full datasets are available from the corresponding author on reasonable request.

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Funding

This work was funded by the French National Research Agency (ANR) in the framework of the Investments for the Future Programme, within the Cluster of Excellence COTE (ANR-10-LABX-45).

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Conceptualization: Nicolas Creusot, Betty Chaumet, Nicolas Mazzella, Soizic Morin; formal analysis and investigation: Nicolas Creusot, Betty Chaumet, Mélissa Eon, Aurélie Moreira, Soizic Morin; methodology: Nicolas Creusot, Betty Chaumet, Nicolas Mazzella, Soizic Morin; funding acquisition: Nicolas Mazzella, Soizic Morin; supervision: Nicolas Mazzella, Soizic Morin; validation Nicolas Creusot, Betty Chaumet; writing—original draft preparation: Nicolas Creusot; writing—review and editing: Nicolas Creusot, Betty Chaumet, Nicolas Mazzella, Soizic Morin.

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Correspondence to Nicolas Creusot.

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The authors declare no competing interests.

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Responsible Editor: Diane Purchase

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Creusot, N., Chaumet, B., Eon, M. et al. Metabolomics insight into the influence of environmental factors in responses of freshwater biofilms to the model herbicide diuron. Environ Sci Pollut Res 29, 29332–29347 (2022). https://doi.org/10.1007/s11356-021-17072-7

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  • DOI: https://doi.org/10.1007/s11356-021-17072-7

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