Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.3389/fpls.2023.1120441 |
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| Title (Primary) | Microcosm experiments combined with process based-modeling reveal differential response and adaptation of aquatic primary producers to warming and agricultural run-off |
| Author | López Moreira Mazacotte, G.A.; Polst, B.; Gross, E.M.; Schmitt-Jansen, M.; Hölker, F.; Hilt, S. |
| Source Titel | Frontiers in Plant Science |
| Year | 2023 |
| Department | BIOTOX |
| Volume | 14 |
| Page From | art. 1120441 |
| Language | englisch |
| Topic | T9 Healthy Planet |
| Supplements | https://ndownloader.figstatic.com/files/41289396 |
| Keywords | regime shift; Climate Change; Alternative stable state; stress-induced tolerance; mathematical modeling; multiple stressors; shallow lakes; Phytoplankton succession |
| Abstract | Fertilizers, pesticides and global warming are threatening freshwater aquatic ecosystems. Most of these are shallow ponds or slow-flowing streams or ditches dominated by submerged macrophytes, periphyton or phytoplankton. Regime shifts between the dominance of these primary producers can occur along a gradient of nutrient loading, possibly triggered by specific disturbances interfering with their competitive interactions. However, phytoplankton dominance is less desirable due to lower biodiversity and poorer ecosystem function and services. In this study, we combined a microcosm experiment with a process-based model to test three hypotheses: 1) agricultural run-off (ARO), consisting of nitrate and a mixture of organic pesticides and copper, differentially affects primary producers and enhances the risk of regime shifts, 2) warming increases the risk of an ARO-induced regime shift to phytoplankton dominance and 3) custom-tailored process-based models support mechanistic understanding of experimental results through scenario comparison. Experimentally exposing primary producers to a gradient of nitrate and pesticides at 22°C and 26°C supported the first two hypotheses. ARO had direct negative effects on macrophytes, while phytoplankton gained from warming and indirect effects of ARO like a reduction in the competitive pressure exerted by other groups. We used the process-based model to test eight different scenarios. The best qualitative fit between modeled and observed responses was reached only when taking community adaptation and organism acclimation into account. Our results highlight the importance of considering such processes when attempting to predict the effects of multiple stressors on natural ecosystems. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=23640 |
| López Moreira Mazacotte, G.A., Polst, B., Gross, E.M., Schmitt-Jansen, M., Hölker, F., Hilt, S. (2023): Microcosm experiments combined with process based-modeling reveal differential response and adaptation of aquatic primary producers to warming and agricultural run-off Front. Plant Sci. 14 , art. 1120441 10.3389/fpls.2023.1120441 |
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