Coupling between taxonomic and functional diversity in protistan coastal communities

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.

Full Text

Author's final draft
512 Mo
Supporting Information
8281 Ko
123 Mo
Publisher's official version
204 Mo
How to cite
Ramond Pierre, Sourisseau Marc, Simon Nathalie, Romac Sarah, Schmitt Sophie, Rigaut-Jalabert Fabienne, Henry Nicolas, de Vargas Colomban, Siano Raffaele (2019). Coupling between taxonomic and functional diversity in protistan coastal communities. Environmental Microbiology. 21 (2). 730-749.,

Copy this text