Variations in benthic foraminiferal assemblages in the Tagus mud belt during the last 5700 years: Implications for Tagus River discharge
International audience We analyzed a 10-m sediment core retrieved at 82 m water depth off the coast of the Tagus River (Western Iberian Margin, Portugal) to investigate a linkage between variations in benthic foraminiferal assemblages and Tagus River discharge over the last 5700 years. Benthic foram...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Main Authors: | , , , , , , , |
Other Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2018
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Subjects: | |
Online Access: | https://hal.archives-ouvertes.fr/hal-02369533 https://hal.archives-ouvertes.fr/hal-02369533/document https://hal.archives-ouvertes.fr/hal-02369533/file/Dessandier_etal_PPP_2018.pdf https://doi.org/10.1016/j.palaeo.2018.01.040 |
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Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
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language |
English |
topic |
ACL Holocene Portuguese Margin Paleo-reconstruction North Atlantic Oscillation [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
spellingShingle |
ACL Holocene Portuguese Margin Paleo-reconstruction North Atlantic Oscillation [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU]Sciences of the Universe [physics]/Earth Sciences Dessandier, Pierre-Antoine Bonnin, Jérôme Malaizé, Bruno Lambert, Clément Tjallingii, Rik Warden, Lisa Sinninghe Damsté, Jaap, Kim, Jung-Hyun Variations in benthic foraminiferal assemblages in the Tagus mud belt during the last 5700 years: Implications for Tagus River discharge |
topic_facet |
ACL Holocene Portuguese Margin Paleo-reconstruction North Atlantic Oscillation [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU]Sciences of the Universe [physics]/Earth Sciences |
description |
International audience We analyzed a 10-m sediment core retrieved at 82 m water depth off the coast of the Tagus River (Western Iberian Margin, Portugal) to investigate a linkage between variations in benthic foraminiferal assemblages and Tagus River discharge over the last 5700 years. Benthic foraminiferal assemblages were studied at high resolution in combination with the stable carbon and oxygen isotopic composition of fossil shells of Nonion scaphum, bulk and molecular organic matter properties (TOC, TN, C/N ratio, delta C-13(TOC), delta N-15(bulk), and BIT index), magnetic susceptibility, and XRF analyses. Three periods of environmental changes were identified: 1) high Tagus River discharge in 5750-2200 calendar year before present (cal yr BP), 2) lower discharge characterized by intense upwelling conditions (2250-1250 cal yr BP), and 3) both intense upwelling and Tagus River discharge (1250 cal yr BP-present). The data reveal alternating intense upwelling periods, as shown by the dominance of Cassidulina carinata, Valvulineria bradyana, or Bulimina marginata, whereas periods of increased river discharge are indicated by increase of N. scaphum, Ammonia beccarii, and Planorbulina mediterranensis. The Tagus River discharge was the strongest during the first period, transporting riverine material further offshore and preventing the establishment of a mud belt on the mid-shelf (around 100 m depth). During the second period, a decrease in Tagus River discharge favored the formation of the Tagus mud belt and strongly influenced the benthic environment by creating an organic matter stock. During the third period, intense upwelling and increased Tagus River discharge were recorded by benthic foraminiferal distribution, with an increase of terrestrial elements present in the mud belt. Furthermore, our results showed that variations in benthic foraminiferal assemblages corresponded to the well-known climatic periods in the study area, such as the Roman Period, the Dark Ages, the Medieval Warm Period, and the Little ... |
author2 |
Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Laboratoire Géosciences Océan (LGO) Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 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 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) Royal Netherlands Institute for Sea Research (NIOZ) Utrecht University Utrecht ANR-13-BS06-0003,HAMOC,Dynamique des gyres Nord Atlantique et overturning de la Méditerranée au cours des changements climatiques de l'Holocène(2013) |
format |
Article in Journal/Newspaper |
author |
Dessandier, Pierre-Antoine Bonnin, Jérôme Malaizé, Bruno Lambert, Clément Tjallingii, Rik Warden, Lisa Sinninghe Damsté, Jaap, Kim, Jung-Hyun |
author_facet |
Dessandier, Pierre-Antoine Bonnin, Jérôme Malaizé, Bruno Lambert, Clément Tjallingii, Rik Warden, Lisa Sinninghe Damsté, Jaap, Kim, Jung-Hyun |
author_sort |
Dessandier, Pierre-Antoine |
title |
Variations in benthic foraminiferal assemblages in the Tagus mud belt during the last 5700 years: Implications for Tagus River discharge |
title_short |
Variations in benthic foraminiferal assemblages in the Tagus mud belt during the last 5700 years: Implications for Tagus River discharge |
title_full |
Variations in benthic foraminiferal assemblages in the Tagus mud belt during the last 5700 years: Implications for Tagus River discharge |
title_fullStr |
Variations in benthic foraminiferal assemblages in the Tagus mud belt during the last 5700 years: Implications for Tagus River discharge |
title_full_unstemmed |
Variations in benthic foraminiferal assemblages in the Tagus mud belt during the last 5700 years: Implications for Tagus River discharge |
title_sort |
variations in benthic foraminiferal assemblages in the tagus mud belt during the last 5700 years: implications for tagus river discharge |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.archives-ouvertes.fr/hal-02369533 https://hal.archives-ouvertes.fr/hal-02369533/document https://hal.archives-ouvertes.fr/hal-02369533/file/Dessandier_etal_PPP_2018.pdf https://doi.org/10.1016/j.palaeo.2018.01.040 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
ISSN: 0031-0182 Palaeogeography, Palaeoclimatology, Palaeoecology https://hal.archives-ouvertes.fr/hal-02369533 Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier, 2018, 496, pp.225-237. ⟨10.1016/j.palaeo.2018.01.040⟩ |
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info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2018.01.040 hal-02369533 https://hal.archives-ouvertes.fr/hal-02369533 https://hal.archives-ouvertes.fr/hal-02369533/document https://hal.archives-ouvertes.fr/hal-02369533/file/Dessandier_etal_PPP_2018.pdf doi:10.1016/j.palaeo.2018.01.040 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.palaeo.2018.01.040 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
496 |
container_start_page |
225 |
op_container_end_page |
237 |
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1766136084337524736 |
spelling |
ftccsdartic:oai:HAL:hal-02369533v1 2023-05-15T17:36:33+02:00 Variations in benthic foraminiferal assemblages in the Tagus mud belt during the last 5700 years: Implications for Tagus River discharge Dessandier, Pierre-Antoine Bonnin, Jérôme Malaizé, Bruno Lambert, Clément Tjallingii, Rik Warden, Lisa Sinninghe Damsté, Jaap, Kim, Jung-Hyun Environnements et Paléoenvironnements OCéaniques (EPOC) Observatoire aquitain des sciences de l'univers (OASU) Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-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) UMR 5805 Environnements et Paléoenvironnements Océaniques et Continentaux (EPOC) Laboratoire Géosciences Océan (LGO) Institut Français de Recherche pour l'Exploitation de la Mer - Brest (IFREMER Centre de Bretagne) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Bretagne Sud (UBS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 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 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) Royal Netherlands Institute for Sea Research (NIOZ) Utrecht University Utrecht ANR-13-BS06-0003,HAMOC,Dynamique des gyres Nord Atlantique et overturning de la Méditerranée au cours des changements climatiques de l'Holocène(2013) 2018 https://hal.archives-ouvertes.fr/hal-02369533 https://hal.archives-ouvertes.fr/hal-02369533/document https://hal.archives-ouvertes.fr/hal-02369533/file/Dessandier_etal_PPP_2018.pdf https://doi.org/10.1016/j.palaeo.2018.01.040 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.palaeo.2018.01.040 hal-02369533 https://hal.archives-ouvertes.fr/hal-02369533 https://hal.archives-ouvertes.fr/hal-02369533/document https://hal.archives-ouvertes.fr/hal-02369533/file/Dessandier_etal_PPP_2018.pdf doi:10.1016/j.palaeo.2018.01.040 info:eu-repo/semantics/OpenAccess ISSN: 0031-0182 Palaeogeography, Palaeoclimatology, Palaeoecology https://hal.archives-ouvertes.fr/hal-02369533 Palaeogeography, Palaeoclimatology, Palaeoecology, Elsevier, 2018, 496, pp.225-237. ⟨10.1016/j.palaeo.2018.01.040⟩ ACL Holocene Portuguese Margin Paleo-reconstruction North Atlantic Oscillation [SDE.MCG]Environmental Sciences/Global Changes [SDU.STU]Sciences of the Universe [physics]/Earth Sciences info:eu-repo/semantics/article Journal articles 2018 ftccsdartic https://doi.org/10.1016/j.palaeo.2018.01.040 2021-12-25T23:41:39Z International audience We analyzed a 10-m sediment core retrieved at 82 m water depth off the coast of the Tagus River (Western Iberian Margin, Portugal) to investigate a linkage between variations in benthic foraminiferal assemblages and Tagus River discharge over the last 5700 years. Benthic foraminiferal assemblages were studied at high resolution in combination with the stable carbon and oxygen isotopic composition of fossil shells of Nonion scaphum, bulk and molecular organic matter properties (TOC, TN, C/N ratio, delta C-13(TOC), delta N-15(bulk), and BIT index), magnetic susceptibility, and XRF analyses. Three periods of environmental changes were identified: 1) high Tagus River discharge in 5750-2200 calendar year before present (cal yr BP), 2) lower discharge characterized by intense upwelling conditions (2250-1250 cal yr BP), and 3) both intense upwelling and Tagus River discharge (1250 cal yr BP-present). The data reveal alternating intense upwelling periods, as shown by the dominance of Cassidulina carinata, Valvulineria bradyana, or Bulimina marginata, whereas periods of increased river discharge are indicated by increase of N. scaphum, Ammonia beccarii, and Planorbulina mediterranensis. The Tagus River discharge was the strongest during the first period, transporting riverine material further offshore and preventing the establishment of a mud belt on the mid-shelf (around 100 m depth). During the second period, a decrease in Tagus River discharge favored the formation of the Tagus mud belt and strongly influenced the benthic environment by creating an organic matter stock. During the third period, intense upwelling and increased Tagus River discharge were recorded by benthic foraminiferal distribution, with an increase of terrestrial elements present in the mud belt. Furthermore, our results showed that variations in benthic foraminiferal assemblages corresponded to the well-known climatic periods in the study area, such as the Roman Period, the Dark Ages, the Medieval Warm Period, and the Little ... Article in Journal/Newspaper North Atlantic North Atlantic oscillation Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Palaeogeography, Palaeoclimatology, Palaeoecology 496 225 237 |