Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/96231
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dc.contributor.authorSeco, José-
dc.contributor.authorAparício, Sara-
dc.contributor.authorBrierley, Andrew S.-
dc.contributor.authorBustamante, Paco-
dc.contributor.authorCeia, Filipe R.-
dc.contributor.authorCoelho, João P.-
dc.contributor.authorPhilips, Richard A.-
dc.contributor.authorSaunders, Ryan A.-
dc.contributor.authorFielding, Sophie-
dc.contributor.authorGregory, Susan-
dc.contributor.authorMatias, Ricardo-
dc.contributor.authorPardal, Miguel A.-
dc.contributor.authorPereira, Eduarda-
dc.contributor.authorStowasser, Gabriele-
dc.contributor.authorTarling, G. A.-
dc.contributor.authorXavier, José C.-
dc.date.accessioned2021-11-02T09:21:55Z-
dc.date.available2021-11-02T09:21:55Z-
dc.date.issued2021-04-
dc.identifier.urihttp://hdl.handle.net/10316/96231-
dc.description.abstractBiomagnification 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.pt
dc.description.sponsorshipWe thank the officers, crew and scientists aboard RSS James Clark Ross during cruises JR177 and JR16003 for their assistance in collecting samples. We also thank Giulia Pompeo for her help with the Hg analysis. We are grateful to G. Guillou from the “Plateforme Analyses Isotopiques” of LIENSs for his assistance during stable isotope analyses at the University of La Rochelle. We acknowledge the financial support of the Portuguese Foundation for the Science and Technology (FCT / MCTES) through a PhD grant to José Seco (SRFH/PD/BD/113487) and CESAM (UIDP/50017/2020+UIDB/50017/2020), through national funds. The Institut Universitaire de France is acknowledged for its support to P. Bustamante as a Senior Member. This research was also within strategic program of MARE (MARE - UID/MAR/04292/2020). The work is a contribution to the Ecosystems component of the British Antarctic Survey Polar Science for Planet Earth Programme, funded by the Natural Environment Research Council, which is part of UK Research and Innovation.pt
dc.language.isoengpt
dc.publisherElsevierpt
dc.relationUID/MAR/04292/2020pt
dc.relationSRFH/PD/BD/113487pt
dc.relationinfo:eu-repo/grantAgreement/UID/AMB/50017/2019/CESAMpt
dc.relationUIDP/50017/2020pt
dc.relationUIDB/50017/2020pt
dc.rightsembargoedAccesspt
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt
dc.subjectTrophic magnification slopept
dc.subjectStable isotopespt
dc.subjectContaminantspt
dc.subjectAntarcticapt
dc.subjectPolarpt
dc.titleMercury biomagnification in a Southern Ocean food webpt
dc.typearticlept
degois.publication.firstPage116620pt
degois.publication.lastPage116620pt
degois.publication.titleEnvironmental Pollutionpt
dc.date.updated2021-10-29T22:05:55Z-
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0269749121001986pt
dc.peerreviewedyespt
dc.identifier.doi10.1016/j.envpol.2021.116620pt
degois.publication.volume275pt
dc.description.version6F10-64E8-CFA3 | Filipe Rafael dos Santos Ceia-
dc.description.versionN/A-
dc.identifier.slugcv-prod-2232834-
dc.date.embargo2023-04-01*
uc.date.periodoEmbargo730pt
item.fulltextCom Texto completo-
item.languageiso639-1en-
item.grantfulltextembargo_20230401-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.deptFaculty of Sciences and Technology-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.parentdeptUniversity of Coimbra-
crisitem.author.researchunitMARE - Marine and Environmental Sciences Centre-
crisitem.author.researchunitCFE - Centre for Functional Ecology - Science for People & the Planet-
crisitem.author.researchunitMARE - Marine and Environmental Sciences Centre-
crisitem.author.researchunitMARE - Marine and Environmental Sciences Centre-
crisitem.author.orcid0000-0002-5470-5183-
crisitem.author.orcid0000-0001-6048-7007-
crisitem.author.orcid0000-0002-9621-6660-
Appears in Collections:I&D CFE - Artigos em Revistas Internacionais
I&D MARE - Artigos em Revistas Internacionais
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