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Phytoplankton biodiversity is more important for ecosystem functioning in highly variable thermal environments
Bestion, E.; Haegeman, B.; Alvarez Codesal, S.; Garreau, A.; Huet, M.; Barton, S.; Montoya, J.M. (2021). Phytoplankton biodiversity is more important for ecosystem functioning in highly variable thermal environments. Proc. Natl. Acad. Sci. U.S.A. 118(35): e2019591118. https://dx.doi.org/10.1073/pnas.2019591118
In: Proceedings of the National Academy of Sciences of the United States of America. The Academy: Washington, D.C.. ISSN 0027-8424; e-ISSN 1091-6490, meer
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| Trefwoord |
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| Author keywords |
biodiversity–ecosystem functioning, temperature fluctuation, marine phytoplankton, temperature variability |
| Auteurs | | Top |
- Bestion, E.
- Haegeman, B.
- Alvarez Codesal, S.
- Garreau, A.
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- Huet, M.
- Barton, S.
- Montoya, J.M.
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| Abstract |
The 21st century has seen an acceleration of anthropogenic climate change and biodiversity loss, with both stressors deemed to affect ecosystem functioning. However, we know little about the interactive effects of both stressors and in particular about the interaction of increased climatic variability and biodiversity loss on ecosystem functioning. This should be remedied because larger climatic variability is one of the main features of climate change. Here, we demonstrated that temperature fluctuations led to changes in the importance of biodiversity for ecosystem functioning. We used microcosm communities of different phytoplankton species richness and exposed them to a constant, mild, and severe temperature-fluctuating environment. Wider temperature fluctuations led to steeper biodiversity–ecosystem functioning slopes, meaning that species loss had a stronger negative effect on ecosystem functioning in more fluctuating environments. For severe temperature fluctuations, the slope increased through time due to a decrease of the productivity of species-poor communities over time. We developed a theoretical competition model to better understand our experimental results and showed that larger differences in thermal tolerances across species led to steeper biodiversity–ecosystem functioning slopes. Species-rich communities maintained their ecosystem functioning with increased fluctuation as they contained species able to resist the thermally fluctuating environments, while this was on average not the case in species-poor communities. Our results highlight the importance of biodiversity for maintaining ecosystem functions and services in the context of increased climatic variability under climate change. |
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