Marine diatoms record Late Holocene regime shifts in the Pikialasorsuaq ecosystem
International audience Abstract The Pikialasorsuaq (North Water polynya) is an area of local and global cultural and ecological significance. However, over the last decades, the region has been subject to rapid warming, and in some recent years, the seasonal ice arch that has historically defined th...
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Online Access: | https://hal.science/hal-04269104 https://doi.org/10.1111/gcb.16958 |
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ftccsdartic:oai:HAL:hal-04269104v1 2023-12-03T10:25:53+01:00 Marine diatoms record Late Holocene regime shifts in the Pikialasorsuaq ecosystem Limoges, Audrey Ribeiro, Sofia van Nieuwenhove, Nicolas Jackson, Rebecca Juggins, Stephen Crosta, Xavier Weckström, Kaarina Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) 2023 https://hal.science/hal-04269104 https://doi.org/10.1111/gcb.16958 en eng HAL CCSD Wiley info:eu-repo/semantics/altIdentifier/doi/10.1111/gcb.16958 hal-04269104 https://hal.science/hal-04269104 doi:10.1111/gcb.16958 ISSN: 1354-1013 EISSN: 1365-2486 Global Change Biology https://hal.science/hal-04269104 Global Change Biology, In press, ⟨10.1111/gcb.16958⟩ [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2023 ftccsdartic https://doi.org/10.1111/gcb.16958 2023-11-04T23:28:02Z International audience Abstract The Pikialasorsuaq (North Water polynya) is an area of local and global cultural and ecological significance. However, over the last decades, the region has been subject to rapid warming, and in some recent years, the seasonal ice arch that has historically defined the polynya's northern boundary has failed to form. Both factors are deemed to alter the polynya's ecosystem functioning. To understand how climate‐induced changes to the Pikialasorsuaq impact the basis of the marine food web, we explored diatom community‐level responses to changing conditions, from a sediment core spanning the last 3800 years. Four metrics were used: total diatom concentrations, taxonomic composition, mean size, and diversity. Generalized additive model statistics highlight significant changes at ca. 2400, 2050, 1550, 1200, and 130 cal years BP, all coeval with known transitions between colder and warmer intervals of the Late Holocene, and regime shifts in the Pikialasorsuaq. Notably, a weaker/contracted polynya during the Roman Warm Period and Medieval Climate Anomaly caused the diatom community to reorganize via shifts in species composition, with the presence of larger taxa but lower diversity, and significantly reduced export production. This study underlines the high sensitivity of primary producers to changes in the polynya dynamics and illustrates that the strong pulse of early spring cryopelagic diatoms that makes the Pikialasorsuaq exceptionally productive may be jeopardized by rapid warming and associated Nares Strait ice arch destabilization. Future alterations to the phenology of primary producers may disproportionately impact higher trophic levels and keystone species in this region, with implications for Indigenous Peoples and global diversity. Article in Journal/Newspaper Nares strait Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Nares ENVELOPE(158.167,158.167,-81.450,-81.450) Global Change Biology 29 23 6503 6516 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
[SDE]Environmental Sciences |
spellingShingle |
[SDE]Environmental Sciences Limoges, Audrey Ribeiro, Sofia van Nieuwenhove, Nicolas Jackson, Rebecca Juggins, Stephen Crosta, Xavier Weckström, Kaarina Marine diatoms record Late Holocene regime shifts in the Pikialasorsuaq ecosystem |
topic_facet |
[SDE]Environmental Sciences |
description |
International audience Abstract The Pikialasorsuaq (North Water polynya) is an area of local and global cultural and ecological significance. However, over the last decades, the region has been subject to rapid warming, and in some recent years, the seasonal ice arch that has historically defined the polynya's northern boundary has failed to form. Both factors are deemed to alter the polynya's ecosystem functioning. To understand how climate‐induced changes to the Pikialasorsuaq impact the basis of the marine food web, we explored diatom community‐level responses to changing conditions, from a sediment core spanning the last 3800 years. Four metrics were used: total diatom concentrations, taxonomic composition, mean size, and diversity. Generalized additive model statistics highlight significant changes at ca. 2400, 2050, 1550, 1200, and 130 cal years BP, all coeval with known transitions between colder and warmer intervals of the Late Holocene, and regime shifts in the Pikialasorsuaq. Notably, a weaker/contracted polynya during the Roman Warm Period and Medieval Climate Anomaly caused the diatom community to reorganize via shifts in species composition, with the presence of larger taxa but lower diversity, and significantly reduced export production. This study underlines the high sensitivity of primary producers to changes in the polynya dynamics and illustrates that the strong pulse of early spring cryopelagic diatoms that makes the Pikialasorsuaq exceptionally productive may be jeopardized by rapid warming and associated Nares Strait ice arch destabilization. Future alterations to the phenology of primary producers may disproportionately impact higher trophic levels and keystone species in this region, with implications for Indigenous Peoples and global diversity. |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1 (UB)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École Pratique des Hautes Études (EPHE) Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Limoges, Audrey Ribeiro, Sofia van Nieuwenhove, Nicolas Jackson, Rebecca Juggins, Stephen Crosta, Xavier Weckström, Kaarina |
author_facet |
Limoges, Audrey Ribeiro, Sofia van Nieuwenhove, Nicolas Jackson, Rebecca Juggins, Stephen Crosta, Xavier Weckström, Kaarina |
author_sort |
Limoges, Audrey |
title |
Marine diatoms record Late Holocene regime shifts in the Pikialasorsuaq ecosystem |
title_short |
Marine diatoms record Late Holocene regime shifts in the Pikialasorsuaq ecosystem |
title_full |
Marine diatoms record Late Holocene regime shifts in the Pikialasorsuaq ecosystem |
title_fullStr |
Marine diatoms record Late Holocene regime shifts in the Pikialasorsuaq ecosystem |
title_full_unstemmed |
Marine diatoms record Late Holocene regime shifts in the Pikialasorsuaq ecosystem |
title_sort |
marine diatoms record late holocene regime shifts in the pikialasorsuaq ecosystem |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://hal.science/hal-04269104 https://doi.org/10.1111/gcb.16958 |
long_lat |
ENVELOPE(158.167,158.167,-81.450,-81.450) |
geographic |
Nares |
geographic_facet |
Nares |
genre |
Nares strait |
genre_facet |
Nares strait |
op_source |
ISSN: 1354-1013 EISSN: 1365-2486 Global Change Biology https://hal.science/hal-04269104 Global Change Biology, In press, ⟨10.1111/gcb.16958⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1111/gcb.16958 hal-04269104 https://hal.science/hal-04269104 doi:10.1111/gcb.16958 |
op_doi |
https://doi.org/10.1111/gcb.16958 |
container_title |
Global Change Biology |
container_volume |
29 |
container_issue |
23 |
container_start_page |
6503 |
op_container_end_page |
6516 |
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1784274978314649600 |