Mercury biomagnification in a Southern Ocean food web
International audience Biomagnification of mercury (Hg) in the Scotia Sea food web of the Southern Ocean was examined using the stable isotope ratios of nitrogen (d15N) and carbon (d13C) as proxies for trophic level and feeding habitat, respectively. Total Hg and stable isotopes were measured in sam...
Published in: | Environmental Pollution |
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Main Authors: | , , , , , , , , , , , , , , , |
Other Authors: | , , , , , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2021
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Subjects: | |
Online Access: | https://hal.science/hal-03489570 https://hal.science/hal-03489570/document https://hal.science/hal-03489570/file/Seco%20et%20al%202021%20ENPO.pdf https://doi.org/10.1016/j.envpol.2021.116620 |
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ftunivrochelle:oai:HAL:hal-03489570v1 |
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openpolar |
institution |
Open Polar |
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HAL - Université de La Rochelle |
op_collection_id |
ftunivrochelle |
language |
English |
topic |
Trophic magnification slope Stable isotopes Contaminants Antarctica Polar [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology |
spellingShingle |
Trophic magnification slope Stable isotopes Contaminants Antarctica Polar [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology Seco, José Aparício, Sara Brierley, Andrew Bustamante, Paco Ceia, Filipe Coelho, João Philips, Richard Saunders, Ryan Fielding, Sophie Gregory, Susan Matias, Ricardo Pardal, Miguel Pereira, Eduarda Stowasser, Gabriele Tarling, Geraint Xavier, José Mercury biomagnification in a Southern Ocean food web |
topic_facet |
Trophic magnification slope Stable isotopes Contaminants Antarctica Polar [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology |
description |
International audience Biomagnification of mercury (Hg) in the Scotia Sea food web of the Southern Ocean was examined using the stable isotope ratios of nitrogen (d15N) and carbon (d13C) as proxies for trophic level and feeding habitat, respectively. Total Hg and stable isotopes were measured in samples of particulate organic matter (POM), zooplankton, squid, myctophid fish, notothenioid fish and seabird tissues collected in two years (austral summers 2007/08 and 2016/17). Overall, there was extensive overlap in d13C values across taxonomic groups suggesting similarities in habitats, with the exception of the seabirds, which showed some differences, possibly due to the type of tissue analysed (feathers instead of muscle). d15N showed increasing enrichment across groups in the order POM to zooplankton to squid to myctophid fish to notothenioid fish to seabirds. There were significant differences in d15N and d13C values among species within taxonomic groups, reflecting inter-specific variation in diet. Hg concentrations increased with trophic level, with the lowest values in POM (0.0005 ± 0.0002 mg g-1 dw) and highest values in seabirds (3.88 ± 2.41 mg g-1 in chicks of brown skuas Stercorarius antarcticus). Hg concentrations tended to be lower in 2016/17 than in 2007/08 for mid-trophic level species (squid and fish), but the opposite was found for top predators (i.e. seabirds), which had higher levels in the 2016/17 samples. This may reflect an interannual shift in the Scotia Sea marine food web, caused by the reduced availability of a key prey species, Antarctic krill Euphausia superba. In 2016/17, seabirds would have been forced to feed on higher trophic-level prey, such as myctophids, that have higher Hg burdens. These results suggest that changes in the food web are likely to affect the pathway of mercury to Southern Ocean top predators. |
author2 |
CESAM & Department of Chemistry Universidade de Aveiro Pelagic Ecology Research Group, Faculdade de Ciências e Tecnologia = School of Science & Technology (FCT NOVA) Universidade Nova de Lisboa = NOVA University Lisbon (NOVA) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Institut universitaire de France (IUF) Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.) Marine and Environmental Sciences Centre (MARE UC) Universidade de Coimbra Coimbra Centre for Environmental and Marine Studies Aveiro (CESAM) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Government of South Georgia and the South Sandwich Islands Centre for Functional ecology University of Coimbra Portugal (UC) Centro de Estudos do Ambiente e do Mar (CESAM) |
format |
Article in Journal/Newspaper |
author |
Seco, José Aparício, Sara Brierley, Andrew Bustamante, Paco Ceia, Filipe Coelho, João Philips, Richard Saunders, Ryan Fielding, Sophie Gregory, Susan Matias, Ricardo Pardal, Miguel Pereira, Eduarda Stowasser, Gabriele Tarling, Geraint Xavier, José |
author_facet |
Seco, José Aparício, Sara Brierley, Andrew Bustamante, Paco Ceia, Filipe Coelho, João Philips, Richard Saunders, Ryan Fielding, Sophie Gregory, Susan Matias, Ricardo Pardal, Miguel Pereira, Eduarda Stowasser, Gabriele Tarling, Geraint Xavier, José |
author_sort |
Seco, José |
title |
Mercury biomagnification in a Southern Ocean food web |
title_short |
Mercury biomagnification in a Southern Ocean food web |
title_full |
Mercury biomagnification in a Southern Ocean food web |
title_fullStr |
Mercury biomagnification in a Southern Ocean food web |
title_full_unstemmed |
Mercury biomagnification in a Southern Ocean food web |
title_sort |
mercury biomagnification in a southern ocean food web |
publisher |
HAL CCSD |
publishDate |
2021 |
url |
https://hal.science/hal-03489570 https://hal.science/hal-03489570/document https://hal.science/hal-03489570/file/Seco%20et%20al%202021%20ENPO.pdf https://doi.org/10.1016/j.envpol.2021.116620 |
geographic |
Antarctic Southern Ocean Austral Scotia Sea |
geographic_facet |
Antarctic Southern Ocean Austral Scotia Sea |
genre |
Antarc* Antarctic Antarctic Krill Antarctica antarcticus Euphausia superba Scotia Sea Southern Ocean Stercorarius antarcticus |
genre_facet |
Antarc* Antarctic Antarctic Krill Antarctica antarcticus Euphausia superba Scotia Sea Southern Ocean Stercorarius antarcticus |
op_source |
ISSN: 0269-7491 EISSN: 1873-6424 Environmental Pollution https://hal.science/hal-03489570 Environmental Pollution, 2021, 275, pp.116620. ⟨10.1016/j.envpol.2021.116620⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.envpol.2021.116620 hal-03489570 https://hal.science/hal-03489570 https://hal.science/hal-03489570/document https://hal.science/hal-03489570/file/Seco%20et%20al%202021%20ENPO.pdf doi:10.1016/j.envpol.2021.116620 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.envpol.2021.116620 |
container_title |
Environmental Pollution |
container_volume |
275 |
container_start_page |
116620 |
_version_ |
1798845630407245824 |
spelling |
ftunivrochelle:oai:HAL:hal-03489570v1 2024-05-12T07:53:56+00:00 Mercury biomagnification in a Southern Ocean food web Seco, José Aparício, Sara Brierley, Andrew Bustamante, Paco Ceia, Filipe Coelho, João Philips, Richard Saunders, Ryan Fielding, Sophie Gregory, Susan Matias, Ricardo Pardal, Miguel Pereira, Eduarda Stowasser, Gabriele Tarling, Geraint Xavier, José CESAM & Department of Chemistry Universidade de Aveiro Pelagic Ecology Research Group, Faculdade de Ciências e Tecnologia = School of Science & Technology (FCT NOVA) Universidade Nova de Lisboa = NOVA University Lisbon (NOVA) LIttoral ENvironnement et Sociétés (LIENSs) La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS) Institut universitaire de France (IUF) Ministère de l'Education nationale, de l’Enseignement supérieur et de la Recherche (M.E.N.E.S.R.) Marine and Environmental Sciences Centre (MARE UC) Universidade de Coimbra Coimbra Centre for Environmental and Marine Studies Aveiro (CESAM) British Antarctic Survey (BAS) Natural Environment Research Council (NERC) Government of South Georgia and the South Sandwich Islands Centre for Functional ecology University of Coimbra Portugal (UC) Centro de Estudos do Ambiente e do Mar (CESAM) 2021-04 https://hal.science/hal-03489570 https://hal.science/hal-03489570/document https://hal.science/hal-03489570/file/Seco%20et%20al%202021%20ENPO.pdf https://doi.org/10.1016/j.envpol.2021.116620 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.envpol.2021.116620 hal-03489570 https://hal.science/hal-03489570 https://hal.science/hal-03489570/document https://hal.science/hal-03489570/file/Seco%20et%20al%202021%20ENPO.pdf doi:10.1016/j.envpol.2021.116620 info:eu-repo/semantics/OpenAccess ISSN: 0269-7491 EISSN: 1873-6424 Environmental Pollution https://hal.science/hal-03489570 Environmental Pollution, 2021, 275, pp.116620. ⟨10.1016/j.envpol.2021.116620⟩ Trophic magnification slope Stable isotopes Contaminants Antarctica Polar [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology info:eu-repo/semantics/article Journal articles 2021 ftunivrochelle https://doi.org/10.1016/j.envpol.2021.116620 2024-04-17T15:19:17Z International audience Biomagnification of mercury (Hg) in the Scotia Sea food web of the Southern Ocean was examined using the stable isotope ratios of nitrogen (d15N) and carbon (d13C) as proxies for trophic level and feeding habitat, respectively. Total Hg and stable isotopes were measured in samples of particulate organic matter (POM), zooplankton, squid, myctophid fish, notothenioid fish and seabird tissues collected in two years (austral summers 2007/08 and 2016/17). Overall, there was extensive overlap in d13C values across taxonomic groups suggesting similarities in habitats, with the exception of the seabirds, which showed some differences, possibly due to the type of tissue analysed (feathers instead of muscle). d15N showed increasing enrichment across groups in the order POM to zooplankton to squid to myctophid fish to notothenioid fish to seabirds. There were significant differences in d15N and d13C values among species within taxonomic groups, reflecting inter-specific variation in diet. Hg concentrations increased with trophic level, with the lowest values in POM (0.0005 ± 0.0002 mg g-1 dw) and highest values in seabirds (3.88 ± 2.41 mg g-1 in chicks of brown skuas Stercorarius antarcticus). Hg concentrations tended to be lower in 2016/17 than in 2007/08 for mid-trophic level species (squid and fish), but the opposite was found for top predators (i.e. seabirds), which had higher levels in the 2016/17 samples. This may reflect an interannual shift in the Scotia Sea marine food web, caused by the reduced availability of a key prey species, Antarctic krill Euphausia superba. In 2016/17, seabirds would have been forced to feed on higher trophic-level prey, such as myctophids, that have higher Hg burdens. These results suggest that changes in the food web are likely to affect the pathway of mercury to Southern Ocean top predators. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Antarctica antarcticus Euphausia superba Scotia Sea Southern Ocean Stercorarius antarcticus HAL - Université de La Rochelle Antarctic Southern Ocean Austral Scotia Sea Environmental Pollution 275 116620 |