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Pré-Publication, Document De Travail Année : 2021

Seasonal temporal dynamics of marine protists communities in tidally mixed coastal waters

Mariarita Caracciolo
Fabienne Rigaut-Jalabert
Sarah Romac
  • Fonction : Auteur
Frédéric Mahé
Samuel Forsans
  • Fonction : Auteur
Jean-Philippe Gac
Laure Arsenieff
Maxime Manno
  • Fonction : Auteur
Samuel Chaffron
Thierry Cariou
Mark Hoebeke
Yann Bozec
Florence Le Gall
  • Fonction : Auteur
Loic Guilloux
Colomban de Vargas
Fabrice Not
Eric Thiébaut
Nicolas Henry
  • Fonction : Auteur
  • PersonId : 1118562
Nathalie Simon

Résumé

Major seasonal community reorganizations and associated biomass variations are landmarks of plankton ecology. However, the processes determining marine species and 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 and ribosomal DNA metabarcoding from plankton samples collected biweekly over 8 years (2009-2016) at the SOMLIT-Astan station (Roscoff, Western English Channel). Considering the temporal structure of community dynamics (creating temporal correlation), we elucidated the recurrent seasonal pattern of the dominant species and OTUs (rDNA-derived taxa) that drive annual plankton successions. The use of morphological and molecular analyses in combination allowed us to assess absolute species abundance while improving taxonomic resolution, and revealed a greater diversity. Overall, our results underpinned a protist community characterised by a seasonal structure, which is supported by the dominant OTUs. We detected that some were partly benthic as a result of the intense tidal mixing typical of the French coasts in the English Channel. While the occurrence of these microorganisms is driven by the physical and biogeochemical conditions of the environment, internal community processes, such as the complex network of biotic interactions, also play a key role in shaping protist communities.
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Dates et versions

hal-03454364 , version 1 (29-11-2021)

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Mariarita Caracciolo, Fabienne Rigaut-Jalabert, Sarah Romac, Frédéric Mahé, Samuel Forsans, et al.. Seasonal temporal dynamics of marine protists communities in tidally mixed coastal waters. 2021. ⟨hal-03454364⟩
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