Worldwide occurrence and activity of the reef-building coral symbiont Symbiodinium in the open ocean

Decelle Johan, Carradec Quentin, Pochon Xavier, Henry Nicolas, Romac Sarah, Mahé Frédéric, Dunthorn Micah, Kourlaiev Artem, Voolstra Christian R., Wincker Patrick, de Vargas Colomban. 2018. Worldwide occurrence and activity of the reef-building coral symbiont Symbiodinium in the open ocean. Current Biology, 28 (22):e3 : pp. 3625-3633.

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Quartile : Outlier, Sujet : BIOCHEMISTRY & MOLECULAR BIOLOGY / Quartile : Q1, Sujet : CELL BIOLOGY

Liste HCERES des revues (en SHS) : oui

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

Abstract : The dinoflagellate microalga Symbiodinium sustains coral reefs, one of the most diverse ecosystems of the biosphere, through mutualistic endosymbioses with a wide diversity of benthic hosts [1]. Despite its ecological and economic importance, the presence of Symbiodinium in open oceanic waters remains unknown, which represents a significant knowledge gap to fully understand the eco-evolutionary trajectory and resilience of endangered Symbiodinium-based symbioses. Here, we document the existence of Symbiodinium (i.e., now the family Symbiodiniaceae [2]) in tropical- and temperate-surface oceans using DNA and RNA metabarcoding of size-fractionated plankton samples collected at 109 stations across the globe. Symbiodinium from clades A and C were, by far, the most prevalent and widely distributed lineages (representing 0.1% of phytoplankton reads), while other lineages (clades B, D, E, F, and G) were present but rare. Concurrent metatranscriptomics analyses using the Tara Oceans gene catalog [3] revealed that Symbiodinium clades A and C were transcriptionally active in the open ocean and expressed core metabolic pathways (e.g., photosynthesis, carbon fixation, glycolysis, and ammonium uptake). Metabarcodes and expressed genes of clades A and C were detected in small and large plankton size fractions, suggesting the existence of a free-living population and a symbiotic lifestyle within planktonic hosts, respectively. However, high-resolution genetic markers and microscopy are required to confirm the life history of oceanic Symbiodinium. Overall, the previously unknown, metabolically active presence of Symbiodinium in oceanic waters opens up new avenues for investigating the potential of this oceanic reservoir to repopulate coral reefs following stress-induced bleaching.

Mots-clés Agrovoc : Plancton, Corail, ADN ribosomal, ADN

Mots-clés géographiques Agrovoc : océan Indien, Pacifique Sud, Monde

Mots-clés complémentaires : barcoding moleculaire

Mots-clés libres : Symbiodinium, Phytoplankton, Marine plankton, Symbiosis, Metabarcoding, Open ocean, Metatranscriptomics, Coral reefs, Tara Oceans

Classification Agris : L60 - Animal taxonomy and geography
000 - Other themes

Champ stratégique Cirad : Hors axes (2014-2018)

Auteurs et affiliations

  • Decelle Johan, Université Paris-Sorbonne (FRA) - auteur correspondant
  • Carradec Quentin, Genoscope (FRA)
  • Pochon Xavier, University of Auckland (NZL)
  • Henry Nicolas, Université Paris-Sorbonne (FRA)
  • Romac Sarah, CNRS (FRA)
  • Mahé Frédéric, CIRAD-BIOS-UMR LSTM (FRA) ORCID: 0000-0002-2808-0984
  • Dunthorn Micah, University of Kaiserslautern (DEU)
  • Kourlaiev Artem, Genoscope (FRA)
  • Voolstra Christian R., King Abdullah University of Science and Technology (SAU)
  • Wincker Patrick, Institut de génomique (FRA)
  • de Vargas Colomban, Université Paris-Sorbonne (FRA) - auteur correspondant

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