Regime shifts in shallow aquatic systems caused by agricultural run-off and warming – Insights from micro- and mesocosms experiments
In: SFE2 GFÖ EEF Joint Meeting, International Conference on Ecological Sciences : "Ecology and Evolution: New Perspectives and societal challenges", 2022
Konferenz
Zugriff:
International audience ; Shallow aquatic systems are highly abundant in productive lowland regions with intensive agriculture. Because of their high surface-to-volume ratio, they are prone to multiple stressors such as climate warming and agricultural run-off. Shallow aquatic systems typically occur in two alternative stable states, the desirable macrophyte-dominated state with clear water and a high biodiversity, or the degraded state with phytoplankton or blanketing algae dominance and loss of many ecosystem functions. While eutrophication and climate warming are known driving factors for regime shifts from the macrophyte- to the phytoplankton-dominated state, the role of pollutants such as pesticides and their combined effects with nutrients and warming are unknown. In the French-German project CLIMSHIFT, we investigated in different micro- and mesocosms experiments the role of agricultural run-off (ARO) composed of nitrate and a pesticide mixture (each one organic herbicide, insecticide and fungicide plus copper as ingredient of inorganic fungicides). The micro-and mesocosms contained pelagic and benthic organisms to reflect the tight benthic-pelagic coupling found in these systems. Some experiments were based only on primary producers (submerged macrophytes, phytoplankton and periphyton), while others contained also primary consumers (Daphnia magna or natural zooplankton, Lymnaea stagnalis and Dreissena polymorpha). We applied different exposure scenarios (dose-response, single-versus-pulsed, water or sediment exposures) and tested the full ARO or components of it. ARO always negatively affected the systems, through effects on competitive or trophic interactions, leading to shifts to phytoplankton, periphyton or blanketing algae development at the detriment of submerged macrophytes. Nitrate acted synergistically with pesticides (organic pesticides plus copper) by enhancing negative effects on submerged macrophytes. Warming enhanced macrophyte growth, but in combination with nitrate and pesticides reversed .
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Regime shifts in shallow aquatic systems caused by agricultural run-off and warming – Insights from micro- and mesocosms experiments
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Autor/in / Beteiligte Person: | Gross, Elisabeth Maria ; Allen, Joey ; Vijayaraj, Vinita ; Laviale, Martin ; Kipferler, Nora ; Polst, Bastian Herbert ; López Moreira Mazacotte ; Alejandro, Gregorio ; Hölker, Franz ; Leflaive, Joséphine ; Schmitt-Jansen, Mechthild ; Hilt, Sabine ; Stibor, Herwig ; Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC) ; Institut Ecologie et Environnement (INEE) ; Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Terre et Environnement de Lorraine (OTELo) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) ; Zone Atelier du Bassin de la Moselle LTSER France (ZAM) ; Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS) ; Laboratoire Ecologie Fonctionnelle et Environnement (LEFE) ; Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP) ; Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) ; Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France -Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP) ; Université de Toulouse (UT) ; Ludwig Maximilian University Munich (LMU) ; Helmholtz Zentrum für Umweltforschung = Helmholtz Centre for Environmental Research (UFZ) ; Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB) ; LTSER Zone Atelier Moselle (ZAM) ; ANR-17-CE32-0013,CLIMSHIFT,Changement de régime dans des écosystèmes d'eau douce exposés à des stress combinés de température, engrais et pesticides(2017) |
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Zeitschrift: | SFE2 GFÖ EEF Joint Meeting, International Conference on Ecological Sciences : "Ecology and Evolution: New Perspectives and societal challenges", 2022 |
Veröffentlichung: | HAL CCSD, 2022 |
Medientyp: | Konferenz |
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