Siliceous Rhizaria abundances and diversity in the Mediterranean Sea assessed by combined imaging and metabarcoding approaches

Type Article
Date 2022-10
Language English
Author(s) Llopis Monferrer Natalia1, 2, Biard Tristan3, Sandin Miguel M.2, 4, Lombard Fabien5, 6, Picheral Marc5, Elineau Amanda5, Guidi Lionel1, 5, Leynaert Aude1, Treguer Paul7, Not Fabrice2
Affiliation(s) 1 : Univ Brest, CNRS, IRD, Ifremer, LEMAR, Plouzane, France
2 : Sorbonne University, CNRS, UMR7144 Adaptation and Diversity in Marine Environment (AD2M) Laboratory, Ecology of Marine Plankton team, Station Biologique de Roscoff, Place Georges Teissier, Roscoff, France
3 : LOG, Laboratoire d’Océanologie et de Géosciences, Univ. Littoral Côte d’Opale, Univ. Lille, CNRS, UMR 8187, Wimereux, France
4 : Department of Organismal Biology (Systematic Biology), Uppsala University, Uppsala, Sweden
5 : Sorbonne Université, CNRS, Laboratoire d’Océanographie de Villefranche, Villefranche-sur-Mer, France
6 : Institut Universitaire de France, Paris, France
7 : Univ Brest, CNRS, IRD, Ifremer, LEMAR, Plouzane, France
Source Frontiers In Marine Science (2296-7745) (Frontiers Media SA), 2022-10 , Vol. 9 , P. 895995 (14p.)
DOI 10.3389/fmars.2022.895995
Keyword(s) Rhizaria, Phaeodaria, polycystine, imaging technologies, metabarcoding, silicon cycle

Siliceous Rhizaria (polycystine radiolarians and phaeodarians) are significant contributors to carbon and silicon biogeochemical cycles. Considering their broad taxonomic diversity and their wide size range (from a few micrometres up to several millimetres), a comprehensive evaluation of the entire community to carbon and silicon cycles is challenging. Here, we assess the diversity and contribution of silicified Rhizaria to the global biogenic silica stocks in the upper 500 m of the oligotrophic North-Western Mediterranean Sea using both imaging (FlowCAM, Zooscan and Underwater Vision Profiler) and molecular tools and data. While imaging data (cells m-3) revealed that the most abundant organisms were the smallest, molecular results (number of reads) showed that the largest Rhizaria had the highest relative abundances. While this seems contradictory, relative abundance data obtained with molecular methods appear to be closer to the total biovolume data than to the total abundance data of the organisms. This result reflects a potential link between gene copies number and the volume of a given cell allowing reconciling molecular and imaging data. Using abundance data from imaging methods we estimate that siliceous Rhizaria accounted for up to 6% of the total biogenic silica biomass of the siliceous planktonic community in the upper 500m of the water column.

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Llopis Monferrer Natalia, Biard Tristan, Sandin Miguel M., Lombard Fabien, Picheral Marc, Elineau Amanda, Guidi Lionel, Leynaert Aude, Treguer Paul, Not Fabrice (2022). Siliceous Rhizaria abundances and diversity in the Mediterranean Sea assessed by combined imaging and metabarcoding approaches. Frontiers In Marine Science, 9, 895995 (14p.). Publisher's official version : , Open Access version :