| Title: |
Biotic interactions shape the effect of combined stressors on shallow lake ecosystems: insight from microcosms experiments. |
| Authors: |
Allen, Joey; Gross, Elisabeth M.; Courcoul, Camille; Boulêtreau, Stéphanie; Compin, Arthur; Elger, Arnaud; Ferriol, Jessica; Hilt, Sabine; Jassey, Vincent E.J.; Polst, Bastian H.; Schmitt-Jansen, Mechthild; Stibor, Herwig; Vijayaraj, Vinita; Leflaive, Joséphine |
| Contributors: |
Laboratoire Interdisciplinaire des Environnements Continentaux (LIEC); Institut national des sciences de l'Univers (INSU - CNRS)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS); Laboratoire Ecologie Fonctionnelle et Environnement (LEFE); Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS); Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3); Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Communauté d'universités et établissements de Toulouse (Comue de Toulouse)-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP); Communauté d'universités et établissements de Toulouse (Comue de Toulouse); Leibniz Institute of Freshwater Ecology and Inland Fisheries (IGB); Swiss Federal Institute for Forest, Snow and Landscape Research WSL; Helmholtz Zentrum für Umweltforschung = Helmholtz Centre for Environmental Research (UFZ); Ludwig Maximilian University Munich = Ludwig Maximilians Universität München (LMU); 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) |
| Source: |
10th International Shalow Lakes Conference; https://hal.univ-lorraine.fr/hal-03930069; 10th International Shalow Lakes Conference, Mar 2021, Natal (Virtuel), Brazil |
| Publisher Information: |
CCSD |
| Publication Year: |
2021 |
| Collection: |
Université Toulouse III - Paul Sabatier: HAL-UPS |
| Subject Terms: |
biotic interactions; global warming; agricultural runoff; aquatic ecosystems; Multiple stressors; [SDV.EE]Life Sciences [q-bio]/Ecology; environment; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology |
| Subject Geographic: |
Natal (Virtuel); Brazil |
| Description: |
International audience ; Organisms living in aquatic ecosystems such as shallow lakes are generally affected by multiple anthropogenic stressors such as pesticides and nitrate input from agricultural runoff or increase in temperature due to global warming. While organisms are affected directly by the stressors, they are also affected indirectly through biotic interactions. The aim of our study was to determine the implication of biotic interactions in the effect of multiple stressors on shallow lake ecosystems. We performed a set of microcosm experiments in which organisms were exposed to a cocktail of organic pesticides, copper and nitrate to simulate agricultural runoff. Different scenario of pollutant input, as one or several pulses, were used. A 4°C warming was also used to simulate the impact of global warming. Two separate experiments were performed to determine the direct effect of on a primary producer community (submerged macrophytes, periphyton and phytoplankton) and on a primary consumer, the benthivorous snail Lymnaea stagnalis. In a third experiment, primary producers and three different primary consumers (Daphnia, mussel, snail) were exposed together to allow trophic interactions. When primary producers and consumers were exposed separately, agricultural runoff had a direct positive effect on phytoplankton and a strong negative effect on L. stagnalis. When exposed together, phytoplankton showed in contrast a significant decrease. Using structural equation modelling, we determined that this effect on phytoplankton was not a direct effect of the agricultural runoff but an indirect effect. Indeed, inhibition of L. stagnalis grazing on periphyton induced a positive effect of agricultural runoff on periphyton, while periphyton reduced the development of phytoplankton through competitive interactions. This demonstrates the importance of taking into account biotic interactions to understand the effect of multiples stressors on shallow lake ecosystems. |
| Document Type: |
conference object |
| Language: |
English |
| Availability: |
https://hal.univ-lorraine.fr/hal-03930069 |
| Accession Number: |
edsbas.CF911335 |
| Database: |
BASE |