How marine are Marine Stramenopiles (MAST)? A cross-system evaluation

Obiol Aleix, del Campo Javier, de Vargas Colomban, Mahe Frédéric, Massana Ramon. 2024. How marine are Marine Stramenopiles (MAST)? A cross-system evaluation. FEMS Microbiology Ecology, 100 (11):fiae130, 13 p.

https://doi.org/10.1093/femsec/fiae130

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Url - jeu de données - Entrepôt autre : https://github.com/aleixop/mast_eukbank / Url - jeu de données - Entrepôt autre : https://doi.org/10.5281/zenodo.7804945

Résumé : Marine Stramenopiles (MAST) were first described two decades ago through ribosomal RNA gene (rRNA gene) sequences from marine surveys of microbial eukaryotes. MAST comprise several independent lineages at the base of the Stramenopiles. Despite their prevalence in the ocean, the majority of MAST diversity remains uncultured. Previous studies, mainly in marine environments, have explored MAST's cell morphology, distribution, trophic strategies, and genomics using culturing-independent methods. In comparison, less is known about their presence outside marine habitats. Here, we analyse the extensive EukBank dataset to assess the extent to which MAST can be considered marine protists. Additionally, by incorporating newly available rRNA gene sequences, we update Stramenopiles phylogeny, identifying three novel MAST lineages. Our results indicate that MAST are primarily marine with notable exceptions within MAST-2 and MAST-12, where certain subclades are prevalent in freshwater and soil habitats. In the marine water column, only a few MAST species, particularly within clades -1, -3, -4, and -7, dominate and exhibit clear latitudinal distribution patterns. Overall, the massive sequencing dataset analysed in our study confirms and partially expands the previously described diversity of MASTs groups and underscores the predominantly marine nature of most of these uncultured lineages.

Mots-clés Agrovoc : écologie marine, phylogénie, milieu marin, écologie microbienne

Mots-clés complémentaires : stramenopiles

Mots-clés libres : Biogeography, Diversity and distribution, Habitat, Marine Stramenopiles, Microbial ecology

Classification Agris : M40 - Écologie aquatique
U60 - Sciences de la vie et de la Terre

Champ stratégique Cirad : CTS 1 (2019-) - Biodiversité

Agences de financement hors UE : Ministerio de Ciencia e Innovación, Severo Ochoa Centre of Excellence

Projets sur financement : (ESP) DIVAS, (ESP) GENEXLAB, (ESP) EPIC

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