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Spatial Variation in Mercury Bioaccumulation and Magnification in a Temperate Estuarine Food Web

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dc.contributor.authorFonseca, Vanessa
dc.contributor.authorFrança, Susana
dc.contributor.authorDuarte, Bernardo
dc.contributor.authorCaçador, Isabel
dc.contributor.authorCabral, Henrique
dc.contributor.authorMieiro, Cláudia L
dc.contributor.authorCoelho, João P.
dc.contributor.authorPereira, Eduarda
dc.contributor.authorReis-Santos, Patrick
dc.date.accessioned2020-01-19T18:18:10Z
dc.date.available2020-01-19T18:18:10Z
dc.date.issued2019
dc.description.abstractEstuaries are renown sinks or repositories of contaminants and reflect historical pollution of persistent compounds. In particular, mercury (Hg) contamination is widespread in coastal environments and occurs in both inorganic (THg) and highly toxic organic forms (OHg) with high bioaccumulation potential. Trophic magnification factors have been increasingly used to quantify biomagnification and represent the average rate of change in contaminant concentration throughout a food web. Here, we assessed small-scale spatial variation in THg and OHg concentrations, as well as variations in local trophic magnification factors in three segregated areas of the Tejo estuary. Selected sites covered a gradient of contamination from industrial Hg hotspots to a natural reserve area, and are key nursery areas for multiple fishes. We analyzed concentrations in sediment and biota, representing the entire local food webs. Samples included sediments, primary producers (salt marsh plants), primary consumers (macrobenthic invertebrates) and top consumers (fish muscle and liver), and the trophic web structure was characterized via SIAR mixed-modeling of nitrogen and carbon isotopic ratios. Spatial variation in Hg concentrations was observed in sediment and biota (but not for all species), with highest concentrations in the area near historical mercury input. Hg concentrations increased with trophic level, and so did the OHg fraction (% of OHg relative to THg), with mean maximum values up to 48.7 and 94.9% in invertebrates and fish, respectively. Trophic magnification factors were positive for all sites (p < 0.05 for all regressions), ranging between 1.56 to 1.76 and 1.78 to 2.47 for THg and OHg, respectively. Overall, rates of mercury bioaccumulation were similar across sites with variations in biota Hg concentrations reflecting baseline differences in site environmental levels. Understanding mercury bioaccumulation and magnification in estuarine biota is critical to safeguard the multiple ecologic functions and economic benefits estuaries provide.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3389/fmars.2019.00117pt_PT
dc.identifier.issn2296-7745
dc.identifier.urihttp://hdl.handle.net/10451/41061
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherFrontiers Mediapt_PT
dc.relation.publisherversionhttps://www.frontiersin.org/articles/10.3389/fmars.2019.00117pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectmercurypt_PT
dc.subjecttrophic transferpt_PT
dc.subjectisotopic signaturept_PT
dc.subjectδ15Npt_PT
dc.subjectδ13Cpt_PT
dc.subjectnursery areapt_PT
dc.subjectTejo estuarypt_PT
dc.titleSpatial Variation in Mercury Bioaccumulation and Magnification in a Temperate Estuarine Food Webpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage117pt_PT
oaire.citation.titleFrontiers in Marine Sciencept_PT
oaire.citation.volume6pt_PT
person.familyNameFonseca
person.familyNameFrança
person.familyNameDuarte
person.familyNameCaçador
person.familyNameCabral
person.familyNameReis-Santos
person.givenNameVanessa
person.givenNameSusana
person.givenNameBernardo
person.givenNameIsabel
person.givenNameHenrique
person.givenNamePatrick
person.identifier89449
person.identifier138360
person.identifierhttps://scholar.google.com/citations?user=bTjfoO8AAAAJ&hl=en
person.identifier.ciencia-id1E11-AE01-98EC
person.identifier.ciencia-id4619-D653-066C
person.identifier.ciencia-id731E-093F-D4C8
person.identifier.ciencia-id631C-9FFE-CA81
person.identifier.ciencia-idCD19-4B30-2D53
person.identifier.ciencia-id7310-4EA4-6F12
person.identifier.orcid0000-0002-6374-1194
person.identifier.orcid0000-0002-3406-6951
person.identifier.orcid0000-0003-1914-7435
person.identifier.orcid0000-0002-4475-6091
person.identifier.orcid0000-0002-7646-6208
person.identifier.orcid0000-0001-9843-9465
person.identifier.ridB-2847-2012
person.identifier.ridH-2001-2011
person.identifier.ridC-2618-2012
person.identifier.ridD-5201-2011
person.identifier.scopus-author-id14021110600
person.identifier.scopus-author-id36905466900
person.identifier.scopus-author-id20734149900
person.identifier.scopus-author-id6602533871
person.identifier.scopus-author-id7006073782
person.identifier.scopus-author-id15835590000
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication462e01c3-7782-48f4-aafd-3084c5552605
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relation.isAuthorOfPublication.latestForDiscovery36de15f7-6c1c-4cce-ac65-5719d7ac4faa

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