Pelagic food web structure in high nutrient low chlorophyll (HNLC) and naturally iron fertilized waters in the Kerguelen Islands region, Southern Ocean
International audience The Kerguelen Plateau is a region of natural iron fertilization in the Southern Ocean, within the typically iron limited High Nutrient Low Chlorophyll (HNLC) waters of the eastward flowing Antarctic Circumpolar Current. Between 26 February and 19 March 2018, the MOBYDICK exped...
Published in: | Journal of Marine Systems |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.science/hal-03332150 https://hal.science/hal-03332150/document https://hal.science/hal-03332150/file/87869.pdf https://doi.org/10.1016/j.jmarsys.2021.103625 |
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ftunivrochelle:oai:HAL:hal-03332150v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
HAL - Université de La Rochelle |
op_collection_id |
ftunivrochelle |
language |
English |
topic |
Zooplankton Micronekton Food web Size structure Stable isotopes Southern Ocean Kerguelen plateau [SDE]Environmental Sciences |
spellingShingle |
Zooplankton Micronekton Food web Size structure Stable isotopes Southern Ocean Kerguelen plateau [SDE]Environmental Sciences Hunt, Brian P.V. Espinasse, Boris Pakhomov, Evgeny Cherel, Yves Cotté, Cédric Delegrange, Alice Henschke, Natasha Pelagic food web structure in high nutrient low chlorophyll (HNLC) and naturally iron fertilized waters in the Kerguelen Islands region, Southern Ocean |
topic_facet |
Zooplankton Micronekton Food web Size structure Stable isotopes Southern Ocean Kerguelen plateau [SDE]Environmental Sciences |
description |
International audience The Kerguelen Plateau is a region of natural iron fertilization in the Southern Ocean, within the typically iron limited High Nutrient Low Chlorophyll (HNLC) waters of the eastward flowing Antarctic Circumpolar Current. Between 26 February and 19 March 2018, the MOBYDICK expedition investigated pelagic ecosystem dynamics in the Kerguelen Island region on the northern plateau during the post-phytoplankton bloom period. The survey specifically targeted sampling at two stations in the HNLC waters to the west of the Kerguelen Plateau, and in the iron enriched waters on and to the east of the plateau. A combination of WP2, WP3 and Mesopelagos midwater trawl were used to sample the mesozooplankton (125 μm to ≤ 10 mm), macrozooplankton (10–30 mm) and micronekton (> 30 to 200 mm) communities. Stable carbon (δ 13 C) and nitrogen (δ 15 N) isotopes were measured across representative samples of taxa from all stations. Trophic positions was estimated using a Bayesian isotope mixing model (tRophicPosition), that uses both the δ 13 C and δ 15 N values of baselines and consumers. Meso/macrozooplankton trophic positions (TPs) were ~ 2.4 on the plateau and > 0.6 TPs higher at the upstream HNLC stations. This provides empirical evidence for shorter food chains on the diatom dominated plateau and longer food chains in the HNLC region dominated by pico and nanophytopklankon. Meso/macrozooplankton TPs were also elevated downstream of the plateau, though to a lesser extent than in the upstream region, likely reflecting the effect of downstream iron transport, supporting elevated phytoplankton production in the downstream region. There was a consistent increase in trophic position between meso/macrozooplankton and micronekton of ~ 0.6 at all stations. Food chain length was therefore determined by the composition of and interactions between the trophic levels below micronekton. Similar trophic structure at the two upstream HNLC stations, on either side of the northern branch of the Polar Front, indicated ... |
author2 |
Institute for the Oceans and Fisheries University of British Columbia (UBC) The Arctic University of Norway Tromsø, Norway (UiT) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Processus et interactions de fine échelle océanique (PROTEO) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Institut national supérieur du professorat et de l'éducation - Académie de Lille - Hauts-de-France (INSPE LHdF) Université de Lille ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017) |
format |
Article in Journal/Newspaper |
author |
Hunt, Brian P.V. Espinasse, Boris Pakhomov, Evgeny Cherel, Yves Cotté, Cédric Delegrange, Alice Henschke, Natasha |
author_facet |
Hunt, Brian P.V. Espinasse, Boris Pakhomov, Evgeny Cherel, Yves Cotté, Cédric Delegrange, Alice Henschke, Natasha |
author_sort |
Hunt, Brian P.V. |
title |
Pelagic food web structure in high nutrient low chlorophyll (HNLC) and naturally iron fertilized waters in the Kerguelen Islands region, Southern Ocean |
title_short |
Pelagic food web structure in high nutrient low chlorophyll (HNLC) and naturally iron fertilized waters in the Kerguelen Islands region, Southern Ocean |
title_full |
Pelagic food web structure in high nutrient low chlorophyll (HNLC) and naturally iron fertilized waters in the Kerguelen Islands region, Southern Ocean |
title_fullStr |
Pelagic food web structure in high nutrient low chlorophyll (HNLC) and naturally iron fertilized waters in the Kerguelen Islands region, Southern Ocean |
title_full_unstemmed |
Pelagic food web structure in high nutrient low chlorophyll (HNLC) and naturally iron fertilized waters in the Kerguelen Islands region, Southern Ocean |
title_sort |
pelagic food web structure in high nutrient low chlorophyll (hnlc) and naturally iron fertilized waters in the kerguelen islands region, southern ocean |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03332150 https://hal.science/hal-03332150/document https://hal.science/hal-03332150/file/87869.pdf https://doi.org/10.1016/j.jmarsys.2021.103625 |
genre |
Antarc* Antarctic Kerguelen Islands Mesozooplankton Southern Ocean |
genre_facet |
Antarc* Antarctic Kerguelen Islands Mesozooplankton Southern Ocean |
op_source |
ISSN: 0924-7963 Journal of Marine Systems https://hal.science/hal-03332150 Journal of Marine Systems, 2021, 224, pp.103625. ⟨10.1016/j.jmarsys.2021.103625⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2021.103625 hal-03332150 https://hal.science/hal-03332150 https://hal.science/hal-03332150/document https://hal.science/hal-03332150/file/87869.pdf doi:10.1016/j.jmarsys.2021.103625 WOS: 000696307800003 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.jmarsys.2021.103625 |
container_title |
Journal of Marine Systems |
container_volume |
224 |
container_start_page |
103625 |
_version_ |
1799470423546527744 |
spelling |
ftunivrochelle:oai:HAL:hal-03332150v1 2024-05-19T07:32:24+00:00 Pelagic food web structure in high nutrient low chlorophyll (HNLC) and naturally iron fertilized waters in the Kerguelen Islands region, Southern Ocean Hunt, Brian P.V. Espinasse, Boris Pakhomov, Evgeny Cherel, Yves Cotté, Cédric Delegrange, Alice Henschke, Natasha Institute for the Oceans and Fisheries University of British Columbia (UBC) The Arctic University of Norway Tromsø, Norway (UiT) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE) Processus et interactions de fine échelle océanique (PROTEO) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Institut national supérieur du professorat et de l'éducation - Académie de Lille - Hauts-de-France (INSPE LHdF) Université de Lille ANR-17-CE01-0013,MOBYDICK,Biodiversité des Ecosystèmes Marins et Dynamique du Carbone dans le secteur de Kerguelen : approche intégrée(2017) 2021-12 https://hal.science/hal-03332150 https://hal.science/hal-03332150/document https://hal.science/hal-03332150/file/87869.pdf https://doi.org/10.1016/j.jmarsys.2021.103625 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jmarsys.2021.103625 hal-03332150 https://hal.science/hal-03332150 https://hal.science/hal-03332150/document https://hal.science/hal-03332150/file/87869.pdf doi:10.1016/j.jmarsys.2021.103625 WOS: 000696307800003 info:eu-repo/semantics/OpenAccess ISSN: 0924-7963 Journal of Marine Systems https://hal.science/hal-03332150 Journal of Marine Systems, 2021, 224, pp.103625. ⟨10.1016/j.jmarsys.2021.103625⟩ Zooplankton Micronekton Food web Size structure Stable isotopes Southern Ocean Kerguelen plateau [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2021 ftunivrochelle https://doi.org/10.1016/j.jmarsys.2021.103625 2024-04-24T00:36:21Z International audience The Kerguelen Plateau is a region of natural iron fertilization in the Southern Ocean, within the typically iron limited High Nutrient Low Chlorophyll (HNLC) waters of the eastward flowing Antarctic Circumpolar Current. Between 26 February and 19 March 2018, the MOBYDICK expedition investigated pelagic ecosystem dynamics in the Kerguelen Island region on the northern plateau during the post-phytoplankton bloom period. The survey specifically targeted sampling at two stations in the HNLC waters to the west of the Kerguelen Plateau, and in the iron enriched waters on and to the east of the plateau. A combination of WP2, WP3 and Mesopelagos midwater trawl were used to sample the mesozooplankton (125 μm to ≤ 10 mm), macrozooplankton (10–30 mm) and micronekton (> 30 to 200 mm) communities. Stable carbon (δ 13 C) and nitrogen (δ 15 N) isotopes were measured across representative samples of taxa from all stations. Trophic positions was estimated using a Bayesian isotope mixing model (tRophicPosition), that uses both the δ 13 C and δ 15 N values of baselines and consumers. Meso/macrozooplankton trophic positions (TPs) were ~ 2.4 on the plateau and > 0.6 TPs higher at the upstream HNLC stations. This provides empirical evidence for shorter food chains on the diatom dominated plateau and longer food chains in the HNLC region dominated by pico and nanophytopklankon. Meso/macrozooplankton TPs were also elevated downstream of the plateau, though to a lesser extent than in the upstream region, likely reflecting the effect of downstream iron transport, supporting elevated phytoplankton production in the downstream region. There was a consistent increase in trophic position between meso/macrozooplankton and micronekton of ~ 0.6 at all stations. Food chain length was therefore determined by the composition of and interactions between the trophic levels below micronekton. Similar trophic structure at the two upstream HNLC stations, on either side of the northern branch of the Polar Front, indicated ... Article in Journal/Newspaper Antarc* Antarctic Kerguelen Islands Mesozooplankton Southern Ocean HAL - Université de La Rochelle Journal of Marine Systems 224 103625 |