Trajectories of nutrients concentrations and ratios in the French coastal ecosystems: 20 years of changes in relation with large-scale and local drivers

Type Article
Date 2023-01
Language English
Author(s) Lheureux Arnaud1, David Valérie1, Del Amo Yolanda1, Soudant DominiqueORCID2, Auby IsabelleORCID3, Bozec Yann4, Conan Pascal5, Ganthy FlorianORCID3, Grégori Gérald6, Lefebvre AlainORCID7, Leynaert Aude8, Rimmelin-Maury Peggy8, Souchu Philippe9, Vantrepote Vincent10, Blondel Camille7, Cariou Thierry4, 11, Crispi Olivier5, Cordier Marie-Ange1, Crouvoisier Muriel10, Duquesne Vincent7, Ferreira Sophie1, Garcia Nicole6, Gouriou Laure3, Grossteffan Emilie8, Le Merrer YoannORCID9, Meteigner ClaireORCID3, Retho MichaelORCID9, Tournaire Marie-Pierre3, Savoye Nicolas1
Affiliation(s) 1 : Université de Bordeaux-CNRS, UMR 5805, Environnement Paléoenvironnement Océaniques et Côtiers (EPOC), 2 Rue du Professeur Jolyet, 33120 Arcachon, France
2 : Ifremer Nantes, Valorisation de l'Information pour la Gestion Intégrée Et la Surveillance (VIGIES), 44311 Cedex 03, Rue de l'Île d'Yeu, 44980 Nantes, France
3 : Ifremer, LER AR 1 Quai du Commandant Silhouette, 33120 Arcachon, France
4 : Sorbonne Université, UPMC Univ. Paris 06, CNRS, UMR 7144 AD2M, Station Biologique de Roscoff, 29680 Roscoff, France
5 : Sorbonne Université, UPMC Univ. Paris 06, CNRS, UMR7621 LOMIC, Observatoire Océanologique, F-66650 Banyuls sur Mer, France
6 : Aix-Marseille Université, Univ. de Toulon, CNRS, INSU, IRD, UM 110 MIO, 163 Avenue de Luminy, 13288 Marseille, France
7 : Ifremer, Unité Littoral, Laboratoire Environnement Ressources, 150 Quai Gambetta, 62320 Boulogne-sur-Mer, France
8 : IUEM-UAR 3113, rue Dumont d'Urville, 29280 Plouzané, France
9 : Ifremer, LER MPL Rue de l'Ile d'Yeu, BP 21105, 44311, Cedex 03, Nantes, France
10 : Univ. Littoral Côte d'Opale, Univ. Lille, CNRS, UMR 8187 LOG, F-62930 Wimereux, France
11 : IRD, UAR191, Instrumentation, Moyens Analytiques, Observatoires en Géophysique et Océanographie (IMAGO), Technopôle de Brest-Iroise, Plouzané, France
Source Science Of The Total Environment (0048-9697) (Elsevier BV), 2023-01 , Vol. 857 , N. part 3 , P. 159619 (16p.)
DOI 10.1016/j.scitotenv.2022.159619
WOS© Times Cited 3
Keyword(s) Nutrients concentrations, Long-term changes, Global change, Ecosystem trajectories, Multi-ecosystem
Abstract

Along with their important diversity, coastal ecosystems receive various amounts of nutrients, principally arising from the continent and from the related human activities (mainly industrial and agricultural activities). During the 20th century, nutrients loads have increased following the increase of both the global population and need of services. Alongside, climate change including temperature increase or atmospheric circulation change has occurred. These processes, Ecosystem state changes are hard to monitor and predict. To study the long-term changes of nutrients concentrations in coastal ecosystems, eleven French coastal ecosystems were studied over 20 years as they encompass large climatic and land pressures, representative of temperate ecosystems, over a rather small geographical area. Both univariate (time series decomposition) and multivariate (relationships between ecosystems and drivers) statistical analyses were used to determine ecosystem trajectories as well as typologies of ecosystem trajectories. It appeared that most of the French coastal ecosystems exhibited trajectories towards a decrease in nutrients concentrations. Differences in trajectories mainly depended on continental and human influences, as well as on climatic regimes. One single ecosystem exhibited very different trajectories, the Arcachon Bay with an increase in nutrients concentrations. Ecosystem trajectories based on ordination techniques were proven to be useful tools to monitor ecosystem changes. This study highlighted the importance of local environments and the need to couple uni- and multi-ecosystem studies. Although the studied ecosystems were influenced by both local and large-scale climate, by anthropogenic activities loads, and that their trajectories were mostly similar based on their continental influence, non-negligible variations resulted from their internal functioning.

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Lheureux Arnaud, David Valérie, Del Amo Yolanda, Soudant Dominique, Auby Isabelle, Bozec Yann, Conan Pascal, Ganthy Florian, Grégori Gérald, Lefebvre Alain, Leynaert Aude, Rimmelin-Maury Peggy, Souchu Philippe, Vantrepote Vincent, Blondel Camille, Cariou Thierry, Crispi Olivier, Cordier Marie-Ange, Crouvoisier Muriel, Duquesne Vincent, Ferreira Sophie, Garcia Nicole, Gouriou Laure, Grossteffan Emilie, Le Merrer Yoann, Meteigner Claire, Retho Michael, Tournaire Marie-Pierre, Savoye Nicolas (2023). Trajectories of nutrients concentrations and ratios in the French coastal ecosystems: 20 years of changes in relation with large-scale and local drivers. Science Of The Total Environment, 857(part 3), 159619 (16p.). Publisher's official version : https://doi.org/10.1016/j.scitotenv.2022.159619 , Open Access version : https://archimer.ifremer.fr/doc/00799/91100/