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Effets de pesticides sur l'activité et la diversité des communautés microbiennes d'un milieu lotique récepteur. Etudes in situ et expérimentales

Abstract : The effects of pesticides on natural algal and bacterial communities from a French stream were investigated using an in situ approach, followed over two years, and using microcosms studies realized with the herbicides diuron and glyphosate (10 μg l-1). The predominance of herbicides in the stream affects algal biomass and diversity and leads to a selection of four major genus. Algal communities sensitivity to a particular pesticide varies according to physiological state and taxonomic composition. The quantitative (i.e. cellular density, heterotrophic production and activity) and qualitative (i.e. genetic diversity) impact of herbicides on bacterial communities is principally due to indirect effects. This impact is more pronounced in microcosms where bacteria are more dependent on algal production in experimental systems due to the lack of allochthonous organic inputs .
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https://tel.archives-ouvertes.fr/tel-00717397
Contributor : Camille Meyer <>
Submitted on : Thursday, July 12, 2012 - 4:28:58 PM
Last modification on : Tuesday, February 23, 2021 - 11:28:02 AM
Long-term archiving on: : Thursday, December 15, 2016 - 10:59:07 PM

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Stéphane Pesce. Effets de pesticides sur l'activité et la diversité des communautés microbiennes d'un milieu lotique récepteur. Etudes in situ et expérimentales. Biochimie, Biologie Moléculaire. Université Blaise Pascal - Clermont-Ferrand II, 2006. Français. ⟨tel-00717397⟩

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