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Auteur Galand, P.E.; Pereira, O.; Hochart, C.; Auguet, J-C.; Debroas, D.
Titre A strong link between marine microbial community composition and function challenges the idea of functional redundancy Type Article scientifique
Année 2018 Publication Revue Abrégée Isme J.
Volume 12 Numéro 10 Pages 2470-2478
Mots-Clés biosphere; cell; depth; diversity; dynamics; gene; program; sequencing data; short read alignment; waters
Résumé Marine microbes have tremendous diversity, but a fundamental question remains unanswered: why are there so many microbial species in the sea? The idea of functional redundancy for microbial communities has long been assumed, so that the high level of richness is often explained by the presence of different taxa that are able to conduct the exact same set of metabolic processes and that can readily replace each other. Here, we refute the hypothesis of functional redundancy for marine microbial communities by showing that a shift in the community composition altered the overall functional attributes of communities across different temporal and spatial scales. Our metagenomic monitoring of a coastal northwestern Mediterranean site also revealed that diverse microbial communities harbor a high diversity of potential proteins. Working with all information given by the metagenomes (all reads) rather than relying only on known genes (annotated orthologous genes) was essential for revealing the similarity between taxonomic and functional community compositions. Our finding does not exclude the possibility for a partial redundancy where organisms that share some specific function can coexist when they differ in other ecological requirements. It demonstrates, however, that marine microbial diversity reflects a tremendous diversity of microbial metabolism and highlights the genetic potential yet to be discovered in an ocean of microbes.
Auteur institutionnel Thèse
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Langue English Langue du Résumé Titre Original
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Volume de collection Numéro de collection Edition
ISSN 1751-7362 ISBN Médium
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Numéro d'Appel MARBEC @ alain.herve @ collection 2435
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