Modern palynological record in the Bay of Brest (NW France): Signal calibration for palaeo-reconstructions
International audience Modern palynological investigations (pollen and non-pollen palynomorphs) have been carried out for the first time in the entire Bay of Brest (BB; NW France), a semi-enclosed oceanic basin flooded during the Holocene that today is exposed to both marine (North Atlantic surface...
Published in: | Review of Palaeobotany and Palynology |
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Main Authors: | , , , , , , |
Other Authors: | , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2017
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Subjects: | |
Online Access: | https://halshs.archives-ouvertes.fr/halshs-01737642 https://halshs.archives-ouvertes.fr/halshs-01737642/document https://halshs.archives-ouvertes.fr/halshs-01737642/file/Lambert_etal_RoPaP_2017.pdf https://doi.org/10.1016/j.revpalbo.2017.04.005 |
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Université de Nantes: HAL-UNIV-NANTES |
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language |
English |
topic |
Pollen Dinocyst Surface sediment Estuarine dynamics Vegetation cover ACL [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory |
spellingShingle |
Pollen Dinocyst Surface sediment Estuarine dynamics Vegetation cover ACL [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory Lambert, Clément Vidal, Muriel Pénaud, Aurélie Combourieu-Nebout, Nathalie Lebreton, Vincent Ragueneau, Olivier Grégoire, Gwendoline Modern palynological record in the Bay of Brest (NW France): Signal calibration for palaeo-reconstructions |
topic_facet |
Pollen Dinocyst Surface sediment Estuarine dynamics Vegetation cover ACL [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory |
description |
International audience Modern palynological investigations (pollen and non-pollen palynomorphs) have been carried out for the first time in the entire Bay of Brest (BB; NW France), a semi-enclosed oceanic basin flooded during the Holocene that today is exposed to both marine (North Atlantic surface waters) and fluvial (Aulne and Elorn rivers) influences. Palynological analyses were conducted on 41 surface sediments collected in several mudded bays where low-energy conditions prevail, allowing for fine particle decantation, and also on 12 moss samples considered to be pollen rain collectors taken on the periphery of the BB. Furthermore, the BB allows a direct comparison between landscapes and fossilized pollen assemblages in sediments thanks to relatively small watersheds and well-studied vegetation cover on land. Our data display a well-known distortion between pollen taxa percentages calculated from palynological slides and current vegetation cover on land, with a particular overestimation of arboreal taxa as well as an underestimation of herbaceous ones, especially of cereal crops that represent a major component of the regional continental vegetation. Various factors may be involved, including pollen transport issues, taphonomic processes, and different pollination rates according to trees/herbaceous taxa. Under close examination, we find that while all surface sediments show the same major species, palynological maps established in the BB regarding some specific pollen taxa exhibit differences and upstream-downstream gradients. Also, the comparison between the pollen content in BB surface sediments and in mosses supports the hydrodynamic influence acting on the pollen distribution in sediments. More specifically, we suggest that some arboreal taxa reflect a watershed effect, especially Alnus, which seems to be highly correlated to river influences and could therefore be considered as a potential proxy for fluvial Holocene palaeo-discharges within the BB. |
author2 |
Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-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 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 Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Histoire naturelle de l'Homme préhistorique (HNHP) Muséum national d'Histoire naturelle (MNHN)-Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS) Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) |
format |
Article in Journal/Newspaper |
author |
Lambert, Clément Vidal, Muriel Pénaud, Aurélie Combourieu-Nebout, Nathalie Lebreton, Vincent Ragueneau, Olivier Grégoire, Gwendoline |
author_facet |
Lambert, Clément Vidal, Muriel Pénaud, Aurélie Combourieu-Nebout, Nathalie Lebreton, Vincent Ragueneau, Olivier Grégoire, Gwendoline |
author_sort |
Lambert, Clément |
title |
Modern palynological record in the Bay of Brest (NW France): Signal calibration for palaeo-reconstructions |
title_short |
Modern palynological record in the Bay of Brest (NW France): Signal calibration for palaeo-reconstructions |
title_full |
Modern palynological record in the Bay of Brest (NW France): Signal calibration for palaeo-reconstructions |
title_fullStr |
Modern palynological record in the Bay of Brest (NW France): Signal calibration for palaeo-reconstructions |
title_full_unstemmed |
Modern palynological record in the Bay of Brest (NW France): Signal calibration for palaeo-reconstructions |
title_sort |
modern palynological record in the bay of brest (nw france): signal calibration for palaeo-reconstructions |
publisher |
HAL CCSD |
publishDate |
2017 |
url |
https://halshs.archives-ouvertes.fr/halshs-01737642 https://halshs.archives-ouvertes.fr/halshs-01737642/document https://halshs.archives-ouvertes.fr/halshs-01737642/file/Lambert_etal_RoPaP_2017.pdf https://doi.org/10.1016/j.revpalbo.2017.04.005 |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
ISSN: 0034-6667 Review of Palaeobotany and Palynology https://halshs.archives-ouvertes.fr/halshs-01737642 Review of Palaeobotany and Palynology, Elsevier, 2017, 244, pp.13 - 25. ⟨10.1016/j.revpalbo.2017.04.005⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.revpalbo.2017.04.005 halshs-01737642 https://halshs.archives-ouvertes.fr/halshs-01737642 https://halshs.archives-ouvertes.fr/halshs-01737642/document https://halshs.archives-ouvertes.fr/halshs-01737642/file/Lambert_etal_RoPaP_2017.pdf doi:10.1016/j.revpalbo.2017.04.005 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.revpalbo.2017.04.005 |
container_title |
Review of Palaeobotany and Palynology |
container_volume |
244 |
container_start_page |
13 |
op_container_end_page |
25 |
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1766135185847353344 |
spelling |
ftunivnantes:oai:HAL:halshs-01737642v1 2023-05-15T17:35:53+02:00 Modern palynological record in the Bay of Brest (NW France): Signal calibration for palaeo-reconstructions Lambert, Clément Vidal, Muriel Pénaud, Aurélie Combourieu-Nebout, Nathalie Lebreton, Vincent Ragueneau, Olivier Grégoire, Gwendoline Domaines Océaniques (LDO) Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Observatoire des Sciences de l'Univers-Institut d'écologie et environnement-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 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 Géosciences Océan (LGO) Université de Bretagne Sud (UBS)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Histoire naturelle de l'Homme préhistorique (HNHP) Muséum national d'Histoire naturelle (MNHN)-Université de Perpignan Via Domitia (UPVD)-Centre National de la Recherche Scientifique (CNRS) Géosciences Marines (GM) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER) ANR-10-LABX-0019,LabexMER,LabexMER Marine Excellence Research: a changing ocean(2010) 2017-09 https://halshs.archives-ouvertes.fr/halshs-01737642 https://halshs.archives-ouvertes.fr/halshs-01737642/document https://halshs.archives-ouvertes.fr/halshs-01737642/file/Lambert_etal_RoPaP_2017.pdf https://doi.org/10.1016/j.revpalbo.2017.04.005 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.revpalbo.2017.04.005 halshs-01737642 https://halshs.archives-ouvertes.fr/halshs-01737642 https://halshs.archives-ouvertes.fr/halshs-01737642/document https://halshs.archives-ouvertes.fr/halshs-01737642/file/Lambert_etal_RoPaP_2017.pdf doi:10.1016/j.revpalbo.2017.04.005 info:eu-repo/semantics/OpenAccess ISSN: 0034-6667 Review of Palaeobotany and Palynology https://halshs.archives-ouvertes.fr/halshs-01737642 Review of Palaeobotany and Palynology, Elsevier, 2017, 244, pp.13 - 25. ⟨10.1016/j.revpalbo.2017.04.005⟩ Pollen Dinocyst Surface sediment Estuarine dynamics Vegetation cover ACL [SHS.ARCHEO]Humanities and Social Sciences/Archaeology and Prehistory info:eu-repo/semantics/article Journal articles 2017 ftunivnantes https://doi.org/10.1016/j.revpalbo.2017.04.005 2022-07-13T00:00:26Z International audience Modern palynological investigations (pollen and non-pollen palynomorphs) have been carried out for the first time in the entire Bay of Brest (BB; NW France), a semi-enclosed oceanic basin flooded during the Holocene that today is exposed to both marine (North Atlantic surface waters) and fluvial (Aulne and Elorn rivers) influences. Palynological analyses were conducted on 41 surface sediments collected in several mudded bays where low-energy conditions prevail, allowing for fine particle decantation, and also on 12 moss samples considered to be pollen rain collectors taken on the periphery of the BB. Furthermore, the BB allows a direct comparison between landscapes and fossilized pollen assemblages in sediments thanks to relatively small watersheds and well-studied vegetation cover on land. Our data display a well-known distortion between pollen taxa percentages calculated from palynological slides and current vegetation cover on land, with a particular overestimation of arboreal taxa as well as an underestimation of herbaceous ones, especially of cereal crops that represent a major component of the regional continental vegetation. Various factors may be involved, including pollen transport issues, taphonomic processes, and different pollination rates according to trees/herbaceous taxa. Under close examination, we find that while all surface sediments show the same major species, palynological maps established in the BB regarding some specific pollen taxa exhibit differences and upstream-downstream gradients. Also, the comparison between the pollen content in BB surface sediments and in mosses supports the hydrodynamic influence acting on the pollen distribution in sediments. More specifically, we suggest that some arboreal taxa reflect a watershed effect, especially Alnus, which seems to be highly correlated to river influences and could therefore be considered as a potential proxy for fluvial Holocene palaeo-discharges within the BB. Article in Journal/Newspaper North Atlantic Université de Nantes: HAL-UNIV-NANTES Review of Palaeobotany and Palynology 244 13 25 |