Seasonal dynamics of marine protist communities in tidally mixed coastal waters

Caracciolo Mariarita, Rigaut-Jalabert Fabienne, Romac Sarah, Mahé Frédéric, Forsans Samuel, Gac Jean-Philippe, Arsenieff Laure, Manno Maxime, Chaffron Samuel, Cariou Thierry, Hoebeke Mark, Bozec Yann, Goberville Eric, Le Gall Florence, Guilloux Loïc, Baudoux Anne-Claire, de Vargas Colomban, Not Fabrice, Thiébaut Eric, Henry Nicolas, Simon Nathalie. 2022. Seasonal dynamics of marine protist communities in tidally mixed coastal waters. Molecular Ecology, 31 (14) : 3761-3783.

https://doi.org/10.1111/mec.16539

Article de revue ; Article de recherche ; Article de revue à facteur d'impact

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Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.5033180 / Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.5032451

Liste HCERES des revues (en SHS) : oui

Thème(s) HCERES des revues (en SHS) : Psychologie-éthologie-ergonomie

Résumé : Major seasonal community reorganizations and associated biomass variations are landmarks of plankton ecology. However, the processes of plankton community turnover rates have not been fully elucidated so far. Here, we analyse patterns of planktonic protist community succession in temperate latitudes, based on quantitative taxonomic data from both microscopy counts (cells >10 μm) and ribosomal DNA metabarcoding (size fraction >3 μm, 18S rRNA gene) from plankton samples collected bimonthly over 8 years (2009–2016) at the SOMLIT-Astan station (Roscoff, Western English Channel). Based on morphology, diatoms were clearly the dominating group all year round and over the study period. Metabarcoding uncovered a wider diversity spectrum and revealed the prevalence of Dinophyceae and diatoms but also of Cryptophyta, Chlorophyta, Cercozoa, Syndiniales and Ciliophora in terms of read counts and or richness. The use of morphological and molecular analyses in combination allowed improving the taxonomic resolution and to identify the sequence of the dominant species and OTUs (18S V4 rDNA-derived taxa) that drive annual plankton successions. We detected that some of these dominant OTUs were benthic as a result of the intense tidal mixing typical of the French coasts in the English Channel. Our analysis of the temporal structure of community changes point to a strong seasonality and resilience. The temporal structure of environmental variables (especially Photosynthetic Active Radiation, temperature and macronutrients) and temporal structures generated by species life cycles and or species interactions, are key drivers of the observed cyclic annual plankton turnover.

Mots-clés Agrovoc : écologie marine, plancton, dynamique des marées, variation saisonnière, Bacillariophyceae, dynamique des populations, Pyrrophycophyta, communauté de pêcheurs côtiers, picoplancton, nanoplancton

Mots-clés libres : Annual succession, DNA metabarcoding, Marine protists, Temporal variability, Time-series data, Western English Channel

Agences de financement européennes : European Commission

Agences de financement hors UE : Agence Nationale de la Recherche, Gordon and Betty Moore Foundation

Programme de financement européen : H2020

Projets sur financement : (FRA) IMPLICATIONS ECOLOGIQUES ET BIOGEOCHIMIQUE DES GLYCOSIDASES ASSOCIEES AUX VIRUS MARINS, (FRA) Biodiversité des eucaryotes marins, (FRA) Biotechnologies et bioressources pour la valorisation des écosystèmes marins planctoniques, (EU) Marine Microbial Biodiversity, Bioinformatics and Biotechnology

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