Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10773/37501 |
Resumo: | Total and organic mercury concentrations were determined for males, females and juveniles of Euphausia superba collected at three discrete locations in the Scotia Sea (South Orkney Islands, South Georgia and Antarctic Polar Front) to assess spatial mercury variability in Antarctic krill. There was clear geographic differentiation in mercury concentrations, with specimens from the South Orkney Islands having total mercury concentrations 5 to 7 times higher than Antarctic krill from South Georgia and the Antarctic Polar Front. Mercury did not appear to accumulate with life-stage since juveniles had higher concentrations of total mercury (0.071 μg g-1 from South Orkney Islands; 0.014 μg g-1 from South Georgia) than adults (0.054 μg g-1 in females and 0.048 μg g-1 in males from South Orkney Islands; 0.006 μg g-1 in females and 0.007 μg g-1 in males from South Georgia). Results suggest that females may use egg laying as a mechanism to excrete mercury, with eggs having higher concentrations than the corresponding somatic tissue. Organic mercury makes up a minor percentage of total mercury (15-37%) with the percentage being greater in adults than in juveniles. When compared to euphausiids from other parts of the world, the concentration of mercury in Antarctic krill is within the same range, or higher, highlighting the global distribution of this contaminant. Given the high potential for biomagnification of mercury through food webs, concentrations in Antarctic krill may have deleterious effects on long-lived Antarctic krill predators. |
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Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia SeaFood-webEgg layingCrustaceanSouthern OceanContaminantTotal and organic mercury concentrations were determined for males, females and juveniles of Euphausia superba collected at three discrete locations in the Scotia Sea (South Orkney Islands, South Georgia and Antarctic Polar Front) to assess spatial mercury variability in Antarctic krill. There was clear geographic differentiation in mercury concentrations, with specimens from the South Orkney Islands having total mercury concentrations 5 to 7 times higher than Antarctic krill from South Georgia and the Antarctic Polar Front. Mercury did not appear to accumulate with life-stage since juveniles had higher concentrations of total mercury (0.071 μg g-1 from South Orkney Islands; 0.014 μg g-1 from South Georgia) than adults (0.054 μg g-1 in females and 0.048 μg g-1 in males from South Orkney Islands; 0.006 μg g-1 in females and 0.007 μg g-1 in males from South Georgia). Results suggest that females may use egg laying as a mechanism to excrete mercury, with eggs having higher concentrations than the corresponding somatic tissue. Organic mercury makes up a minor percentage of total mercury (15-37%) with the percentage being greater in adults than in juveniles. When compared to euphausiids from other parts of the world, the concentration of mercury in Antarctic krill is within the same range, or higher, highlighting the global distribution of this contaminant. Given the high potential for biomagnification of mercury through food webs, concentrations in Antarctic krill may have deleterious effects on long-lived Antarctic krill predators.Elsevier2023-05-04T10:48:44Z2019-04-01T00:00:00Z2019-04info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10773/37501eng0269-749110.1016/j.envpol.2019.01.031Seco, JoséXavier, José C.Coelho, João P.Pereira, BárbaraTarling, GeraintPardal, Miguel A.Bustamante, PacoStowasser, GabrieleBrierley, Andrew S.Pereira, Maria E.info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-02-22T12:12:29Zoai:ria.ua.pt:10773/37501Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:08:07.676445Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea |
title |
Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea |
spellingShingle |
Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea Seco, José Food-web Egg laying Crustacean Southern Ocean Contaminant |
title_short |
Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea |
title_full |
Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea |
title_fullStr |
Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea |
title_full_unstemmed |
Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea |
title_sort |
Spatial variability in total and organic mercury levels in Antarctic krill Euphausia superba across the Scotia Sea |
author |
Seco, José |
author_facet |
Seco, José Xavier, José C. Coelho, João P. Pereira, Bárbara Tarling, Geraint Pardal, Miguel A. Bustamante, Paco Stowasser, Gabriele Brierley, Andrew S. Pereira, Maria E. |
author_role |
author |
author2 |
Xavier, José C. Coelho, João P. Pereira, Bárbara Tarling, Geraint Pardal, Miguel A. Bustamante, Paco Stowasser, Gabriele Brierley, Andrew S. Pereira, Maria E. |
author2_role |
author author author author author author author author author |
dc.contributor.author.fl_str_mv |
Seco, José Xavier, José C. Coelho, João P. Pereira, Bárbara Tarling, Geraint Pardal, Miguel A. Bustamante, Paco Stowasser, Gabriele Brierley, Andrew S. Pereira, Maria E. |
dc.subject.por.fl_str_mv |
Food-web Egg laying Crustacean Southern Ocean Contaminant |
topic |
Food-web Egg laying Crustacean Southern Ocean Contaminant |
description |
Total and organic mercury concentrations were determined for males, females and juveniles of Euphausia superba collected at three discrete locations in the Scotia Sea (South Orkney Islands, South Georgia and Antarctic Polar Front) to assess spatial mercury variability in Antarctic krill. There was clear geographic differentiation in mercury concentrations, with specimens from the South Orkney Islands having total mercury concentrations 5 to 7 times higher than Antarctic krill from South Georgia and the Antarctic Polar Front. Mercury did not appear to accumulate with life-stage since juveniles had higher concentrations of total mercury (0.071 μg g-1 from South Orkney Islands; 0.014 μg g-1 from South Georgia) than adults (0.054 μg g-1 in females and 0.048 μg g-1 in males from South Orkney Islands; 0.006 μg g-1 in females and 0.007 μg g-1 in males from South Georgia). Results suggest that females may use egg laying as a mechanism to excrete mercury, with eggs having higher concentrations than the corresponding somatic tissue. Organic mercury makes up a minor percentage of total mercury (15-37%) with the percentage being greater in adults than in juveniles. When compared to euphausiids from other parts of the world, the concentration of mercury in Antarctic krill is within the same range, or higher, highlighting the global distribution of this contaminant. Given the high potential for biomagnification of mercury through food webs, concentrations in Antarctic krill may have deleterious effects on long-lived Antarctic krill predators. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-04-01T00:00:00Z 2019-04 2023-05-04T10:48:44Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10773/37501 |
url |
http://hdl.handle.net/10773/37501 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
0269-7491 10.1016/j.envpol.2019.01.031 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
instname_str |
Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
repository.mail.fl_str_mv |
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1799137734695059456 |