Title :

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

Author(s) :

Llopis Monferrer, Natalia [Auteur]
Laboratoire des Sciences de l'Environnement Marin (LEMAR) [LEMAR]
Adaptation et diversité en milieu marin [ADMM]
Biard, Tristan [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Sandin, Miguel [Auteur]
Adaptation et diversité en milieu marin [ADMM]
Lombard, Fabien [Auteur]
Laboratoire d'océanographie de Villefranche [LOV]
Picheral, Marc [Auteur]
Laboratoire d'océanographie de Villefranche [LOV]
Elineau, Amanda [Auteur]
Laboratoire d'océanographie de Villefranche [LOV]
Guidi, Lionel [Auteur]
Laboratoire d'océanographie de Villefranche [LOV]
Leynaert, Aude [Auteur]
Laboratoire des Sciences de l'Environnement Marin (LEMAR) [LEMAR]
Tréguer, Paul [Auteur]
Laboratoire des Sciences de l'Environnement Marin (LEMAR) [LEMAR]
Not, Fabrice [Auteur]
Adaptation et diversité en milieu marin [ADMM]

Journal title :

Frontiers in Marine Science

Publisher :

Frontiers Media

Publication date :

2022-10-10

ISSN :

2296-7745

HAL domain(s) :

Sciences de l'environnement/Biodiversité et Ecologie

English abstract : [en]

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 ...
Show more >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.Show less >

Language :

Anglais

Popular science :

Non

ANR Project :

Calibration des isotopes stable du silicium des Radiolaires : Développement d'un nouveau paleo-indicateur du cycle du silicium marin

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL