Methylmercury biomagnification in coastal aquatic food webs from western Patagonia and western Antarctic Peninsula

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dc.contributor.authorChiang, Gustavo
dc.contributor.authorKidd, Karen A.
dc.contributor.authorDiaz-Jaramillo, Mauricio
dc.contributor.authorEspejo, Winfred
dc.contributor.authorBahamonde, Paulina
dc.contributor.authorO'Driscoll, Nelson J.
dc.contributor.authorMunkittrick, Kelly R.
dc.date.accessioned2025-01-20T23:55:56Z
dc.date.available2025-01-20T23:55:56Z
dc.date.issued2021
dc.description.abstractMercury (Hg) is a global pollutant of concern because its organic and more toxic form, methylHg (MeHg), bioaccumulates and biomagnifies through aquatic food webs to levels that affect the health of fish and fish consumers, including humans. Although much is known about trophic transfer of MeHg in aquatic food webs at temperate latitudes in the northern hemisphere, it is unclear whether its fate is similar in biota from coastal zones of the southeastern Pacific. To assess this gap, MeHg, total Hg and food web structure (using delta C-13 and delta N-15) were measured in marine macroinvertebrates, fishes, birds, and mammals from Patagonian fjords and the Antarctic Peninsula. Trophic magnification slopes (TMS; log MeHg versus delta N-15) for coastal food webs of Patagonia were high when compared with studies in the northern hemisphere, and significantly higher near freshwater inputs as compared to offshore sites (0.244 vs 0.192). Similarly, in Antarctica, the site closer to glacial inputs had a significantly higher TMS than the one in the Southern Shetland Islands (0.132 vs 0.073). Composition of the food web also had an influence, as the TMS increased when mammals and seabirds were excluded (0.132-0.221) at a coastal site. This study found that both the composition of the food web and the proximity to freshwater outflows are key factors influencing the TMS for MeHg in Patagonian and Antarctic food webs. (C) 2020 Elsevier Ltd. All rights reserved.
dc.fuente.origenWOS
dc.identifier.doi10.1016/j.chemosphere.2020.128360
dc.identifier.eissn1879-1298
dc.identifier.issn0045-6535
dc.identifier.urihttps://doi.org/10.1016/j.chemosphere.2020.128360
dc.identifier.urihttps://repositorio.uc.cl/handle/11534/95121
dc.identifier.wosidWOS:000587290300164
dc.language.isoen
dc.revistaChemosphere
dc.rightsacceso restringido
dc.subjectMethylmercury biomagnification
dc.subjectMarine food web
dc.subjectStable isotopes
dc.subjectPatagonia
dc.subjectAntarctica
dc.titleMethylmercury biomagnification in coastal aquatic food webs from western Patagonia and western Antarctic Peninsula
dc.typeartículo
dc.volumen262
sipa.indexWOS
sipa.trazabilidadWOS;2025-01-12
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