Coupling between taxonomic and functional diversity in protistan coastal communities
|Author(s)||Ramond Pierre1, 2, Sourisseau Marc2, Simon Nathalie1, Romac Sarah1, Schmitt Sophie2, Rigaut-Jalabert Fabienne3, Henry Nicolas1, De Vargas Colomban1, Siano Raffaele1, 2|
|Affiliation(s)||1 : Sorbonne Université, CNRS - UMR7144 - Station Biologique de Roscoff; Place Georges Teissier, 29688 Roscoff ,FRANCE
2 : Dyneco Pelagos, IFREMER; BP 70, 29280 Plouzané ,France
3 : Sorbonne Université, CNRS - FR2424, Station Biologique de Roscoff, Place Georges Teissier; 29688 Roscoff ,FRANCE
|Source||Environmental Microbiology (1462-2912) (Wiley), 2019-02 , Vol. 21 , N. 2 , P. 730-749|
|WOS© Times Cited||8|
The study of protistan functional diversity is crucial to understand the dynamics of oceanic ecological processes. We combined the metabarcoding data of various coastal ecosystems and a newly developed trait‐based approach to study the link between taxonomic and functional diversity across marine protistan communities of different size‐classes. Environmental DNA was extracted and the V4 18S rDNA genomic region was amplified and sequenced. In parallel, we tried to annotate the Operational Taxonomic Units (OTUs) from our metabarcoding dataset to 30 biological traits using published and accessible information on protists. We then developed a method to study trait correlations across protists (i.e. trade‐offs) in order to build the best functional groups. Based on the annotated OTUs and our functional groups, we demonstrated that the functional diversity of marine protist communities varied in parallel with their taxonomic diversity. The coupling between functional and taxonomic diversity was conserved across different protist size classes. However, the smallest size‐fraction was characterized by wider taxonomic and functional groups diversity, corroborating the idea that nano‐ and pico‐plankton are part of a more stable ecological background on which larger protists and metazoans might develop.