Unveiling the role of Rhizaria in the silicon cycle
Rhizaria are ubiquitous planktonic protists, thriving from surface waters to bathypelagicecosystems. A number of rhizarians taxa (i.e., polycystines, phaeodarians) build complex and robust siliceous skeletons. Yet, basic knowledge such as abundances, diversity, cellular content (biogenic silica-bSi,...
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ftinsu:oai:HAL:tel-03259625v1 2024-02-11T10:08:17+01:00 Unveiling the role of Rhizaria in the silicon cycle Rôle des Rhizaria dans le cycle du silicium Llopis Monferrer, Natalia Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Paul Tréguer Aude Leynaert Fabrice Not 2020-09-18 https://theses.hal.science/tel-03259625 https://theses.hal.science/tel-03259625/document https://theses.hal.science/tel-03259625/file/These-2020-SML-Chimie_marine-LLOPIS_MONFERRER_Natalia.pdf en eng HAL CCSD NNT: 2020BRES0041 tel-03259625 https://theses.hal.science/tel-03259625 https://theses.hal.science/tel-03259625/document https://theses.hal.science/tel-03259625/file/These-2020-SML-Chimie_marine-LLOPIS_MONFERRER_Natalia.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-03259625 Other. Université de Bretagne occidentale - Brest, 2020. English. ⟨NNT : 2020BRES0041⟩ Silicon cycle Biogenic silica Silicic acid uptake Rhizaria Polycystina Phaeodaria Cycle de la silice Silice biogénique Production de silice Polycystines [CHIM.OTHE]Chemical Sciences/Other info:eu-repo/semantics/doctoralThesis Theses 2020 ftinsu 2024-01-24T17:31:34Z Rhizaria are ubiquitous planktonic protists, thriving from surface waters to bathypelagicecosystems. A number of rhizarians taxa (i.e., polycystines, phaeodarians) build complex and robust siliceous skeletons. Yet, basic knowledge such as abundances, diversity, cellular content (biogenic silica-bSi, carbon and nitrogen) and silicon (Si) uptake rates of rhizarians are poorly known. This lack of knowledge prevents an accurate estimate of their contribution to the Si biogeochemical cycle. To address this issue, Si uptake rates —using the 32Siradioisotope— and cellular content were measured during three research cruises (Mediterranean Sea, Ross Sea and Atlantic Ocean). High individual production rates (up to 9 nmol-Si cell-1d-1) and Si content (up to 11.9 nmol-Si cell-1) were reported, as compared to diatoms. Combining these first results with previously published abundance data, the contribution of these organisms to the biogeochemical cycling of Si was assessed,revealing that Rhizaria contribute up to 22% of the bSi production in the global ocean. Additionally, the abundance, biomass and diversity of Rhizaria were quantified by pairing imaging tools (FlowCAM, Zooscan and UVP) and molecular barcode techniques to cover the wide size range represented by Rhizaria in the NW Mediterranean Sea. This integrative approach revealed that Rhizaria represent up to 6% of the bSi in the first 500 metres of the water column. Overall, this work provides unique quantitative data that highlight the impact of rhizarians in the cycling of Si in the ocean. This thesis work also emphasizes the need toexplore further the deep ocean to refine our first estimates of Rhizarian contribution to the Sibiogeochemical cycle at local and global scales Les Rhizaria sont des protistes planctoniques présents à la surface et dans l’ensemble des océans. Certains taxons (i.e., polycystines, Phaeodaria) construisent des squelettes siliceux complexes et robustes. Les connaissances de base telles que l'abondance, la diversité, le contenu cellulaire ... Doctoral or Postdoctoral Thesis Ross Sea Institut national des sciences de l'Univers: HAL-INSU Ross Sea |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Silicon cycle Biogenic silica Silicic acid uptake Rhizaria Polycystina Phaeodaria Cycle de la silice Silice biogénique Production de silice Polycystines [CHIM.OTHE]Chemical Sciences/Other |
spellingShingle |
Silicon cycle Biogenic silica Silicic acid uptake Rhizaria Polycystina Phaeodaria Cycle de la silice Silice biogénique Production de silice Polycystines [CHIM.OTHE]Chemical Sciences/Other Llopis Monferrer, Natalia Unveiling the role of Rhizaria in the silicon cycle |
topic_facet |
Silicon cycle Biogenic silica Silicic acid uptake Rhizaria Polycystina Phaeodaria Cycle de la silice Silice biogénique Production de silice Polycystines [CHIM.OTHE]Chemical Sciences/Other |
description |
Rhizaria are ubiquitous planktonic protists, thriving from surface waters to bathypelagicecosystems. A number of rhizarians taxa (i.e., polycystines, phaeodarians) build complex and robust siliceous skeletons. Yet, basic knowledge such as abundances, diversity, cellular content (biogenic silica-bSi, carbon and nitrogen) and silicon (Si) uptake rates of rhizarians are poorly known. This lack of knowledge prevents an accurate estimate of their contribution to the Si biogeochemical cycle. To address this issue, Si uptake rates —using the 32Siradioisotope— and cellular content were measured during three research cruises (Mediterranean Sea, Ross Sea and Atlantic Ocean). High individual production rates (up to 9 nmol-Si cell-1d-1) and Si content (up to 11.9 nmol-Si cell-1) were reported, as compared to diatoms. Combining these first results with previously published abundance data, the contribution of these organisms to the biogeochemical cycling of Si was assessed,revealing that Rhizaria contribute up to 22% of the bSi production in the global ocean. Additionally, the abundance, biomass and diversity of Rhizaria were quantified by pairing imaging tools (FlowCAM, Zooscan and UVP) and molecular barcode techniques to cover the wide size range represented by Rhizaria in the NW Mediterranean Sea. This integrative approach revealed that Rhizaria represent up to 6% of the bSi in the first 500 metres of the water column. Overall, this work provides unique quantitative data that highlight the impact of rhizarians in the cycling of Si in the ocean. This thesis work also emphasizes the need toexplore further the deep ocean to refine our first estimates of Rhizarian contribution to the Sibiogeochemical cycle at local and global scales Les Rhizaria sont des protistes planctoniques présents à la surface et dans l’ensemble des océans. Certains taxons (i.e., polycystines, Phaeodaria) construisent des squelettes siliceux complexes et robustes. Les connaissances de base telles que l'abondance, la diversité, le contenu cellulaire ... |
author2 |
Laboratoire des Sciences de l'Environnement Marin (LEMAR) (LEMAR) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Institut Universitaire Européen de la Mer (IUEM) Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Paul Tréguer Aude Leynaert Fabrice Not |
format |
Doctoral or Postdoctoral Thesis |
author |
Llopis Monferrer, Natalia |
author_facet |
Llopis Monferrer, Natalia |
author_sort |
Llopis Monferrer, Natalia |
title |
Unveiling the role of Rhizaria in the silicon cycle |
title_short |
Unveiling the role of Rhizaria in the silicon cycle |
title_full |
Unveiling the role of Rhizaria in the silicon cycle |
title_fullStr |
Unveiling the role of Rhizaria in the silicon cycle |
title_full_unstemmed |
Unveiling the role of Rhizaria in the silicon cycle |
title_sort |
unveiling the role of rhizaria in the silicon cycle |
publisher |
HAL CCSD |
publishDate |
2020 |
url |
https://theses.hal.science/tel-03259625 https://theses.hal.science/tel-03259625/document https://theses.hal.science/tel-03259625/file/These-2020-SML-Chimie_marine-LLOPIS_MONFERRER_Natalia.pdf |
geographic |
Ross Sea |
geographic_facet |
Ross Sea |
genre |
Ross Sea |
genre_facet |
Ross Sea |
op_source |
https://theses.hal.science/tel-03259625 Other. Université de Bretagne occidentale - Brest, 2020. English. ⟨NNT : 2020BRES0041⟩ |
op_relation |
NNT: 2020BRES0041 tel-03259625 https://theses.hal.science/tel-03259625 https://theses.hal.science/tel-03259625/document https://theses.hal.science/tel-03259625/file/These-2020-SML-Chimie_marine-LLOPIS_MONFERRER_Natalia.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1790607351936450560 |