The fate of biogenic iron during a phytoplankton bloom induced by natural fertilisation: Impact of copepod grazing
International audience The impact of copepod grazing on Fe regeneration was investigated in a naturally iron fertilised area during KEOPS (Kerguelen Ocean and Plateau compared Study, Jan.-Feb. 2005). 55Fe labelled natural plankton assemblages (< 200 μm) were offered as food to copepod predators s...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Main Authors: | , , , , , |
Other Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2008
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Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-00456141 https://hal.univ-brest.fr/hal-00456141/document https://hal.univ-brest.fr/hal-00456141/file/Sarthou_et_al_2008.pdf https://doi.org/10.1016/j.dsr2.2007.12.033 |
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English |
topic |
Iron regeneration food web copepod grazing phytoplankton bloom [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
Iron regeneration food web copepod grazing phytoplankton bloom [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Sarthou, Géraldine Vincent, Dorothée Christaki, Urania Obernosterer, I. Timmermans, Klaas Brussaard, Corina The fate of biogenic iron during a phytoplankton bloom induced by natural fertilisation: Impact of copepod grazing |
topic_facet |
Iron regeneration food web copepod grazing phytoplankton bloom [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience The impact of copepod grazing on Fe regeneration was investigated in a naturally iron fertilised area during KEOPS (Kerguelen Ocean and Plateau compared Study, Jan.-Feb. 2005). 55Fe labelled natural plankton assemblages (< 200 μm) were offered as food to copepod predators sampled in the field (Calanus propinquus, Rhincalanus gigas, Metridia lucens and Oithona frigida). Diatoms (Eucampia antarctica, Corethron inerme and Navicula spp.) constituted the bulk of the protists whereas microzooplankton (i.e. ciliates and dinoflagellates) were in very low abundance. Copepod grazing on phytoplankton ranged from 0.3 to 2.6 µgC ind-1 d-1 and reflected low utilisation of the food stocks (1-10% of total Chlorophyll a d-1) and low daily rations (0.2-3.3 % body C d-1). Copepod grazing resulted in a 1.7-2.3-fold increase in Fe regeneration. Fe speciation determined by extraction onto C18 columns showed that less than 1% of the regenerated Fe was complexed with hydrophobic organic ligands. This suggests that Fe was regenerated as inorganic species and/or bound to freely soluble organic ligands. The biogenic Fe budget established from our study and literature based data indicates that most of the primary production is recycled through the detrital pool, which represents the largest Fe pool (49% of total Fe). Our iron budget further indicates that mesozooplankton and diatoms represent the dominant Fe biomasses above the Kerguelen plateau. The rate of Fe regeneration accounts for half of the Fe demand, strengthening the need for new Fe sources to sustain the massive phytoplankton bloom above the Kerguelen plateau. |
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) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) Université du Littoral Côte d'Opale (ULCO) Laboratoire d'océanographie biologique de Banyuls (LOBB) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Royal Netherlands Institute for Sea Research (NIOZ) INSU, IPEV |
format |
Article in Journal/Newspaper |
author |
Sarthou, Géraldine Vincent, Dorothée Christaki, Urania Obernosterer, I. Timmermans, Klaas Brussaard, Corina |
author_facet |
Sarthou, Géraldine Vincent, Dorothée Christaki, Urania Obernosterer, I. Timmermans, Klaas Brussaard, Corina |
author_sort |
Sarthou, Géraldine |
title |
The fate of biogenic iron during a phytoplankton bloom induced by natural fertilisation: Impact of copepod grazing |
title_short |
The fate of biogenic iron during a phytoplankton bloom induced by natural fertilisation: Impact of copepod grazing |
title_full |
The fate of biogenic iron during a phytoplankton bloom induced by natural fertilisation: Impact of copepod grazing |
title_fullStr |
The fate of biogenic iron during a phytoplankton bloom induced by natural fertilisation: Impact of copepod grazing |
title_full_unstemmed |
The fate of biogenic iron during a phytoplankton bloom induced by natural fertilisation: Impact of copepod grazing |
title_sort |
fate of biogenic iron during a phytoplankton bloom induced by natural fertilisation: impact of copepod grazing |
publisher |
HAL CCSD |
publishDate |
2008 |
url |
https://hal.univ-brest.fr/hal-00456141 https://hal.univ-brest.fr/hal-00456141/document https://hal.univ-brest.fr/hal-00456141/file/Sarthou_et_al_2008.pdf https://doi.org/10.1016/j.dsr2.2007.12.033 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
ISSN: 0967-0645 Deep Sea Research Part II: Topical Studies in Oceanography https://hal.univ-brest.fr/hal-00456141 Deep Sea Research Part II: Topical Studies in Oceanography, 2008, 55 (5-7), pp.734-751. ⟨10.1016/j.dsr2.2007.12.033⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2007.12.033 hal-00456141 https://hal.univ-brest.fr/hal-00456141 https://hal.univ-brest.fr/hal-00456141/document https://hal.univ-brest.fr/hal-00456141/file/Sarthou_et_al_2008.pdf doi:10.1016/j.dsr2.2007.12.033 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.dsr2.2007.12.033 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
55 |
container_issue |
5-7 |
container_start_page |
734 |
op_container_end_page |
751 |
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1810489100233342976 |
spelling |
ftsorbonneuniv:oai:HAL:hal-00456141v1 2024-09-15T17:42:31+00:00 The fate of biogenic iron during a phytoplankton bloom induced by natural fertilisation: Impact of copepod grazing Sarthou, Géraldine Vincent, Dorothée Christaki, Urania Obernosterer, I. Timmermans, Klaas Brussaard, Corina 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) Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 (LOG) Institut national des sciences de l'Univers (INSU - CNRS)-Université du Littoral Côte d'Opale (ULCO)-Université de Lille-Centre National de la Recherche Scientifique (CNRS)-Institut de Recherche pour le Développement (IRD France-Nord ) Université du Littoral Côte d'Opale (ULCO) Laboratoire d'océanographie biologique de Banyuls (LOBB) Observatoire océanologique de Banyuls (OOB) Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) Royal Netherlands Institute for Sea Research (NIOZ) INSU, IPEV 2008-04-11 https://hal.univ-brest.fr/hal-00456141 https://hal.univ-brest.fr/hal-00456141/document https://hal.univ-brest.fr/hal-00456141/file/Sarthou_et_al_2008.pdf https://doi.org/10.1016/j.dsr2.2007.12.033 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr2.2007.12.033 hal-00456141 https://hal.univ-brest.fr/hal-00456141 https://hal.univ-brest.fr/hal-00456141/document https://hal.univ-brest.fr/hal-00456141/file/Sarthou_et_al_2008.pdf doi:10.1016/j.dsr2.2007.12.033 info:eu-repo/semantics/OpenAccess ISSN: 0967-0645 Deep Sea Research Part II: Topical Studies in Oceanography https://hal.univ-brest.fr/hal-00456141 Deep Sea Research Part II: Topical Studies in Oceanography, 2008, 55 (5-7), pp.734-751. ⟨10.1016/j.dsr2.2007.12.033⟩ Iron regeneration food web copepod grazing phytoplankton bloom [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2008 ftsorbonneuniv https://doi.org/10.1016/j.dsr2.2007.12.033 2024-07-25T23:47:36Z International audience The impact of copepod grazing on Fe regeneration was investigated in a naturally iron fertilised area during KEOPS (Kerguelen Ocean and Plateau compared Study, Jan.-Feb. 2005). 55Fe labelled natural plankton assemblages (< 200 μm) were offered as food to copepod predators sampled in the field (Calanus propinquus, Rhincalanus gigas, Metridia lucens and Oithona frigida). Diatoms (Eucampia antarctica, Corethron inerme and Navicula spp.) constituted the bulk of the protists whereas microzooplankton (i.e. ciliates and dinoflagellates) were in very low abundance. Copepod grazing on phytoplankton ranged from 0.3 to 2.6 µgC ind-1 d-1 and reflected low utilisation of the food stocks (1-10% of total Chlorophyll a d-1) and low daily rations (0.2-3.3 % body C d-1). Copepod grazing resulted in a 1.7-2.3-fold increase in Fe regeneration. Fe speciation determined by extraction onto C18 columns showed that less than 1% of the regenerated Fe was complexed with hydrophobic organic ligands. This suggests that Fe was regenerated as inorganic species and/or bound to freely soluble organic ligands. The biogenic Fe budget established from our study and literature based data indicates that most of the primary production is recycled through the detrital pool, which represents the largest Fe pool (49% of total Fe). Our iron budget further indicates that mesozooplankton and diatoms represent the dominant Fe biomasses above the Kerguelen plateau. The rate of Fe regeneration accounts for half of the Fe demand, strengthening the need for new Fe sources to sustain the massive phytoplankton bloom above the Kerguelen plateau. Article in Journal/Newspaper Antarc* Antarctica HAL Sorbonne Université Deep Sea Research Part II: Topical Studies in Oceanography 55 5-7 734 751 |