Processes controlling aggregate formation and distribution during the Arctic phytoplankton spring bloom in Baffin Bay
International audience In the last decades, the Arctic Ocean has been affected by climate change, leading to alterations in the sea ice cover that influence the phytoplankton spring bloom, its associated food web, and therefore carbon sequestration. During the Green Edge 2016 expedition in the centr...
Published in: | Elementa: Science of the Anthropocene |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03847247 https://doi.org/10.1525/elementa.2021.00001 |
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ftunivnantes:oai:HAL:hal-03847247v1 2023-05-15T15:00:46+02:00 Processes controlling aggregate formation and distribution during the Arctic phytoplankton spring bloom in Baffin Bay Toullec, Jordan Moriceau, Brivaëla Vincent, Dorothée Guidi, Lionel Lafond, Augustin Babin, Marcel Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) 2021-10-26 https://hal.archives-ouvertes.fr/hal-03847247 https://doi.org/10.1525/elementa.2021.00001 en eng HAL CCSD University of California Press info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2021.00001 hal-03847247 https://hal.archives-ouvertes.fr/hal-03847247 doi:10.1525/elementa.2021.00001 EISSN: 2325-1026 Elementa: Science of the Anthropocene https://hal.archives-ouvertes.fr/hal-03847247 Elementa: Science of the Anthropocene, University of California Press, 2021, 9 (1), ⟨10.1525/elementa.2021.00001⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/article Journal articles 2021 ftunivnantes https://doi.org/10.1525/elementa.2021.00001 2022-11-16T00:00:30Z International audience In the last decades, the Arctic Ocean has been affected by climate change, leading to alterations in the sea ice cover that influence the phytoplankton spring bloom, its associated food web, and therefore carbon sequestration. During the Green Edge 2016 expedition in the central Baffin Bay, the phytoplankton spring bloom and its development around the ice edge was followed along 7 transects from open water to the ice-pack interior. Here, we studied some of the processes driving phytoplankton aggregation, using aggregate and copepod distribution profiles obtained with an underwater vision profiler deployed at several stations along the transects. Our results revealed a sequential pattern during sea ice retreat in phytoplankton production and in aggregate production and distribution. First, under sea ice, phytoplankton started to grow, but aggregates were not formed. Second, after sea ice melting, phytoplankton (diatoms and Phaeocystis spp. as the dominant groups) benefited from the light availability and stratified environment to bloom, and aggregation began coincident with nutrient depletion at the surface. Third, maxima of phytoplankton aggregates deepened in the water column and phytoplankton cells at the surface began to degrade. At most stations, silicate limitation began first, triggering aggregation of the phytoplankton cells; nitrate limitation came later. Copepods followed aggregates at the end of the phytoplankton bloom, possibly because aggregates provided higher quality food than senescing phytoplankton cells at the surface. These observations suggest that aggregation is involved in 2 export pathways constituting the biological pump: the gravitational pathway through the sinking of aggregates and fecal pellets and the migration pathway when zooplankton follow aggregates during food foraging. Article in Journal/Newspaper Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Climate change ice pack Phytoplankton Sea ice Zooplankton Copepods Université de Nantes: HAL-UNIV-NANTES Arctic Arctic Ocean Baffin Bay Elementa: Science of the Anthropocene 9 1 |
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Open Polar |
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Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Toullec, Jordan Moriceau, Brivaëla Vincent, Dorothée Guidi, Lionel Lafond, Augustin Babin, Marcel Processes controlling aggregate formation and distribution during the Arctic phytoplankton spring bloom in Baffin Bay |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
International audience In the last decades, the Arctic Ocean has been affected by climate change, leading to alterations in the sea ice cover that influence the phytoplankton spring bloom, its associated food web, and therefore carbon sequestration. During the Green Edge 2016 expedition in the central Baffin Bay, the phytoplankton spring bloom and its development around the ice edge was followed along 7 transects from open water to the ice-pack interior. Here, we studied some of the processes driving phytoplankton aggregation, using aggregate and copepod distribution profiles obtained with an underwater vision profiler deployed at several stations along the transects. Our results revealed a sequential pattern during sea ice retreat in phytoplankton production and in aggregate production and distribution. First, under sea ice, phytoplankton started to grow, but aggregates were not formed. Second, after sea ice melting, phytoplankton (diatoms and Phaeocystis spp. as the dominant groups) benefited from the light availability and stratified environment to bloom, and aggregation began coincident with nutrient depletion at the surface. Third, maxima of phytoplankton aggregates deepened in the water column and phytoplankton cells at the surface began to degrade. At most stations, silicate limitation began first, triggering aggregation of the phytoplankton cells; nitrate limitation came later. Copepods followed aggregates at the end of the phytoplankton bloom, possibly because aggregates provided higher quality food than senescing phytoplankton cells at the surface. These observations suggest that aggregation is involved in 2 export pathways constituting the biological pump: the gravitational pathway through the sinking of aggregates and fecal pellets and the migration pathway when zooplankton follow aggregates during food foraging. |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Toullec, Jordan Moriceau, Brivaëla Vincent, Dorothée Guidi, Lionel Lafond, Augustin Babin, Marcel |
author_facet |
Toullec, Jordan Moriceau, Brivaëla Vincent, Dorothée Guidi, Lionel Lafond, Augustin Babin, Marcel |
author_sort |
Toullec, Jordan |
title |
Processes controlling aggregate formation and distribution during the Arctic phytoplankton spring bloom in Baffin Bay |
title_short |
Processes controlling aggregate formation and distribution during the Arctic phytoplankton spring bloom in Baffin Bay |
title_full |
Processes controlling aggregate formation and distribution during the Arctic phytoplankton spring bloom in Baffin Bay |
title_fullStr |
Processes controlling aggregate formation and distribution during the Arctic phytoplankton spring bloom in Baffin Bay |
title_full_unstemmed |
Processes controlling aggregate formation and distribution during the Arctic phytoplankton spring bloom in Baffin Bay |
title_sort |
processes controlling aggregate formation and distribution during the arctic phytoplankton spring bloom in baffin bay |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.archives-ouvertes.fr/hal-03847247 https://doi.org/10.1525/elementa.2021.00001 |
geographic |
Arctic Arctic Ocean Baffin Bay |
geographic_facet |
Arctic Arctic Ocean Baffin Bay |
genre |
Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Climate change ice pack Phytoplankton Sea ice Zooplankton Copepods |
genre_facet |
Arctic Arctic Ocean Baffin Bay Baffin Bay Baffin Climate change ice pack Phytoplankton Sea ice Zooplankton Copepods |
op_source |
EISSN: 2325-1026 Elementa: Science of the Anthropocene https://hal.archives-ouvertes.fr/hal-03847247 Elementa: Science of the Anthropocene, University of California Press, 2021, 9 (1), ⟨10.1525/elementa.2021.00001⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1525/elementa.2021.00001 hal-03847247 https://hal.archives-ouvertes.fr/hal-03847247 doi:10.1525/elementa.2021.00001 |
op_doi |
https://doi.org/10.1525/elementa.2021.00001 |
container_title |
Elementa: Science of the Anthropocene |
container_volume |
9 |
container_issue |
1 |
_version_ |
1766332830997020672 |