Identification of sources and bioaccumulation pathways of MeHg in subantarctic penguins: a stable isotopic investigation
International audience Seabirds are widely used as bioindicators of mercury (Hg) contamination in marine ecosystems and the investigation of their foraging strategies is of key importance to better understand methylmercury (MeHg) exposure pathways and environmental sources within the different ecosy...
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ftinsu:oai:HAL:hal-01844559v1 2023-05-15T15:59:31+02:00 Identification of sources and bioaccumulation pathways of MeHg in subantarctic penguins: a stable isotopic investigation Renedo, Marina Amouroux, David Pedrero, Zoyne Bustamante, Paco Cherel, Yves LIttoral ENvironnement et Sociétés - UMR 7266 (LIENSs) Institut national des sciences de l'Univers (INSU - CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM) Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) 2018-06-11 https://hal.science/hal-01844559 https://hal.science/hal-01844559/document https://hal.science/hal-01844559/file/186%20Renedo%20et%20al%202018%20Scientific%20Reports.pdf https://doi.org/10.1038/s41598-018-27079-9 en eng HAL CCSD Nature Publishing Group info:eu-repo/semantics/altIdentifier/doi/10.1038/s41598-018-27079-9 hal-01844559 https://hal.science/hal-01844559 https://hal.science/hal-01844559/document https://hal.science/hal-01844559/file/186%20Renedo%20et%20al%202018%20Scientific%20Reports.pdf doi:10.1038/s41598-018-27079-9 info:eu-repo/semantics/OpenAccess ISSN: 2045-2322 EISSN: 2045-2322 Scientific Reports https://hal.science/hal-01844559 Scientific Reports, 2018, 8 (1), pp.8865. ⟨10.1038/s41598-018-27079-9⟩ southern ocean seabird penguin bioaccumulation mercury subantarctic biomagnification stable isotope [SDE]Environmental Sciences info:eu-repo/semantics/article Journal articles 2018 ftinsu https://doi.org/10.1038/s41598-018-27079-9 2023-02-15T19:42:35Z International audience Seabirds are widely used as bioindicators of mercury (Hg) contamination in marine ecosystems and the investigation of their foraging strategies is of key importance to better understand methylmercury (MeHg) exposure pathways and environmental sources within the different ecosystems. Here we report stable isotopic composition for both Hg mass-dependent (e.g. δ202Hg) and mass-independent (e.g. Δ199Hg) fractionation (proxies of Hg sources and transformations), carbon (δ13C, proxy of foraging habitat) and nitrogen (δ15N, proxy of trophic position) in blood of four species of sympatric penguins breeding at the subantarctic Crozet Islands (Southern Indian Ocean). Penguins have species-specific foraging strategies, from coastal to oceanic waters and from benthic to pelagic dives, and feed on different prey. A progressive increase to heavier Hg isotopic composition (δ202Hg and Δ199Hg, respectively) was observed from benthic (1.45 ± 0.12 and 1.41 ± 0.06‰) to epipelagic (1.93 ± 0.18 and 1.77 ± 0.13‰) penguins, indicating a benthic-pelagic gradient of MeHg sources close to Crozet Islands. The relative variations of MeHg concentration, δ202Hg and Δ199Hg with pelagic penguins feeding in Polar Front circumpolar waters (1.66 ± 0.11 and 1.54 ± 0.06‰) support that different MeHg sources occur at large scales in Southern Ocean deep waters. Article in Journal/Newspaper Crozet Islands Southern Ocean Institut national des sciences de l'Univers: HAL-INSU Indian Southern Ocean Scientific Reports 8 1 |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
southern ocean seabird penguin bioaccumulation mercury subantarctic biomagnification stable isotope [SDE]Environmental Sciences |
spellingShingle |
southern ocean seabird penguin bioaccumulation mercury subantarctic biomagnification stable isotope [SDE]Environmental Sciences Renedo, Marina Amouroux, David Pedrero, Zoyne Bustamante, Paco Cherel, Yves Identification of sources and bioaccumulation pathways of MeHg in subantarctic penguins: a stable isotopic investigation |
topic_facet |
southern ocean seabird penguin bioaccumulation mercury subantarctic biomagnification stable isotope [SDE]Environmental Sciences |
description |
International audience Seabirds are widely used as bioindicators of mercury (Hg) contamination in marine ecosystems and the investigation of their foraging strategies is of key importance to better understand methylmercury (MeHg) exposure pathways and environmental sources within the different ecosystems. Here we report stable isotopic composition for both Hg mass-dependent (e.g. δ202Hg) and mass-independent (e.g. Δ199Hg) fractionation (proxies of Hg sources and transformations), carbon (δ13C, proxy of foraging habitat) and nitrogen (δ15N, proxy of trophic position) in blood of four species of sympatric penguins breeding at the subantarctic Crozet Islands (Southern Indian Ocean). Penguins have species-specific foraging strategies, from coastal to oceanic waters and from benthic to pelagic dives, and feed on different prey. A progressive increase to heavier Hg isotopic composition (δ202Hg and Δ199Hg, respectively) was observed from benthic (1.45 ± 0.12 and 1.41 ± 0.06‰) to epipelagic (1.93 ± 0.18 and 1.77 ± 0.13‰) penguins, indicating a benthic-pelagic gradient of MeHg sources close to Crozet Islands. The relative variations of MeHg concentration, δ202Hg and Δ199Hg with pelagic penguins feeding in Polar Front circumpolar waters (1.66 ± 0.11 and 1.54 ± 0.06‰) support that different MeHg sources occur at large scales in Southern Ocean deep waters. |
author2 |
LIttoral ENvironnement et Sociétés - UMR 7266 (LIENSs) Institut national des sciences de l'Univers (INSU - CNRS)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux (IPREM) Université de Pau et des Pays de l'Adour (UPPA)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS) Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC) Institut National de la Recherche Agronomique (INRA)-La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Renedo, Marina Amouroux, David Pedrero, Zoyne Bustamante, Paco Cherel, Yves |
author_facet |
Renedo, Marina Amouroux, David Pedrero, Zoyne Bustamante, Paco Cherel, Yves |
author_sort |
Renedo, Marina |
title |
Identification of sources and bioaccumulation pathways of MeHg in subantarctic penguins: a stable isotopic investigation |
title_short |
Identification of sources and bioaccumulation pathways of MeHg in subantarctic penguins: a stable isotopic investigation |
title_full |
Identification of sources and bioaccumulation pathways of MeHg in subantarctic penguins: a stable isotopic investigation |
title_fullStr |
Identification of sources and bioaccumulation pathways of MeHg in subantarctic penguins: a stable isotopic investigation |
title_full_unstemmed |
Identification of sources and bioaccumulation pathways of MeHg in subantarctic penguins: a stable isotopic investigation |
title_sort |
identification of sources and bioaccumulation pathways of mehg in subantarctic penguins: a stable isotopic investigation |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://hal.science/hal-01844559 https://hal.science/hal-01844559/document https://hal.science/hal-01844559/file/186%20Renedo%20et%20al%202018%20Scientific%20Reports.pdf https://doi.org/10.1038/s41598-018-27079-9 |
geographic |
Indian Southern Ocean |
geographic_facet |
Indian Southern Ocean |
genre |
Crozet Islands Southern Ocean |
genre_facet |
Crozet Islands Southern Ocean |
op_source |
ISSN: 2045-2322 EISSN: 2045-2322 Scientific Reports https://hal.science/hal-01844559 Scientific Reports, 2018, 8 (1), pp.8865. ⟨10.1038/s41598-018-27079-9⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1038/s41598-018-27079-9 hal-01844559 https://hal.science/hal-01844559 https://hal.science/hal-01844559/document https://hal.science/hal-01844559/file/186%20Renedo%20et%20al%202018%20Scientific%20Reports.pdf doi:10.1038/s41598-018-27079-9 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1038/s41598-018-27079-9 |
container_title |
Scientific Reports |
container_volume |
8 |
container_issue |
1 |
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1766395466531995648 |