Multiple phytoplankton community responses to environmental change in a temperate coastal system: A trait-based approach

Type Article
Date 2022-10
Language English
Author(s) Breton Elsa1, Goberville Eric2, Sautour Benoit3, Ouadi Anis3, Skouroliakou Dimitra-Ioli1, Seuront Laurent1, 4, 5, Beaugrand Gregory1, Kléparski Loïck1, 6, Crouvoisier Muriel1, Pecqueur David7, Salmeron Christophe7, Cauvin Arnaud1, Poquet Adrien1, 8, Garcia Nicole9, Gohin Francis10, Christaki Urania1
Affiliation(s) 1 : Univ. Littoral Côte d’Opale, CNRS, Univ. Lille, UMR 8187 LOG, Wimereux, France
2 : Unité Biologie des Organismes et Ecosystèmes Aquatiques (BOREA), Muséum National d’Histoire Naturelle, CNRS, IRD, Sorbonne Université, Université de Caen Normandie, Université des Antilles, Paris, France
3 : Univ. Bordeaux, CNRS, UMR 5805 EPOC, Rue Geoffroy Saint Hilaire – Bâtiment B18N, Pessac, France
4 : Department of Marine Resources and Energy, Tokyo University of Marine Science and Technology, Tokyo, Japan
5 : Department of Zoology and Entomology, Rhodes University, Grahamstown, South Africa
6 : Continuous Plankton Recorder (CPR) Survey, Marine Biological Association, Plymouth, United Kingdom
7 : Observatoire Océanologique de Banyuls s/mer, FR 3724 - Laboratoire Arago - SU/CNRS, avenue Pierre Fabre Bât B, Banyuls sur Mer, France
8 : Univ. Côte d’Azur, CNRS, INSERM, IRCAN, Medical School of Nice, Nice, France
9 : Aix Marseille Univ., Université de Toulon, CNRS, IRD, MIO, Marseille, France
10 : Laboratoire d’écologie pélagique, IFREMER, DYNECO PELAGOS, CS 10070-29280 Plouzané, Brittany, France
Source Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2022-10 , Vol. 9 , P. 914475 (23p.)
DOI 10.3389/fmars.2022.914475
WOS© Times Cited 1
Keyword(s) biodiversity, community assembly, diatoms, environmental change, functional traits, Phaeocystis, phytoplankton community, temporal niche partitioning
Abstract

The effect of environmental change in structuring the phytoplankton communities of the coastal waters of the Eastern English Channel was investigated by applying a trait-based approach on two decades (1996-2019) of monitoring on diatoms and Phaeocystis. We show that phytoplankton species richness in an unbalanced nutrient supply context was influenced by wind-driven processes, ecological specialization for dissolved inorganic phosphorous, temporal niche differentiation, and a competition-defense and/or a growth-defense trade-off, a coexistence mechanism where weak competitors (i.e., slower growing) are better protected against predation. Under the influence of both environmental perturbations (e.g., wind-driven processes, freshwater influence, unbalanced nutrient levels) and biotic interactions (e.g., competition, predation, facilitation), phytoplankton species exhibited specific survival strategies such as investment on growth, adaptation and tolerance of species to environmental stresses, silicification and resource specialization. These strategies have led to more speciose communities, higher productivity, functional redundancy and stability in the last decade. Our results revealed that the unbalanced nutrient reduction facilitated Phaeocystis blooms and that anthropogenic climate warming and nitrate reduction may threaten the diatom communities of the eastern English Channel in a near future. Our results provide strong support for biogeographical historical and niche-based processes in structuring the phytoplankton community in this temperate region. The variety of species responses that we characterized in this region may help to better understand future changes in pelagic ecosystems, and can serve as a basis to consider functional approaches for future ecosystem management.

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Breton Elsa, Goberville Eric, Sautour Benoit, Ouadi Anis, Skouroliakou Dimitra-Ioli, Seuront Laurent, Beaugrand Gregory, Kléparski Loïck, Crouvoisier Muriel, Pecqueur David, Salmeron Christophe, Cauvin Arnaud, Poquet Adrien, Garcia Nicole, Gohin Francis, Christaki Urania (2022). Multiple phytoplankton community responses to environmental change in a temperate coastal system: A trait-based approach. Frontiers In Marine Science, 9, 914475 (23p.). Publisher's official version : https://doi.org/10.3389/fmars.2022.914475 , Open Access version : https://archimer.ifremer.fr/doc/00797/90893/