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Communication Dans Un Congrès Année : 2015

Combined effects of drought and fungicide exposure on aquatic leaf litter decomposition

Effets combinés de l'assèchement et d'une exposition à un fongicide sur la décomposition de litière en milieu aquatique

Résumé

Leaf litter decomposition plays an essential role in the functioning of stream ecosystems. This process, driven by microbial and invertebrate communities, is likely to be severely affected in a context of global change, increasing, among others, the occurrence of drought events and water pollution. Since most of the aquatic ecosystems are exposed to multi-stress conditions, we evaluated in artificial channels the combined effects of drought and the fungicide tebuconazole on Alnus glutinosa litter breakdown by aquatic microorganisms as well as the indirect impact on leaf consumption rate by the amphipod Gammarus fossarum. In our experimental conditions, the structure and activity of bacterial and fungal communities and the resulting microbial decomposition of leaves were mainly impacted by drought, whatever drought frequency. The impact of tebuconazole alone (~17 µg/L) was very limited but a cumulative effect of combined stress was observed, leading to a significant decrease in microbial enzymatic activities and leaf litter decomposition. Direct effects on microorganisms also led to indirect effects on invertebrate shredders, resulting in a decrease in leaf consumption rate by Gammarus under drought and combined stress.
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Dates et versions

hal-02602286 , version 1 (16-05-2020)

Identifiants

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Stéphane Pesce, O. Zoghlami, C. Bender, C. Margoum, Joan Artigas, et al.. Combined effects of drought and fungicide exposure on aquatic leaf litter decomposition. 2015 Aquatic Sciences Meeting (ASLO), Feb 2015, Granada, Spain. pp.20. ⟨hal-02602286⟩
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