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dc.contributor.authorPainter, KJ
dc.contributor.authorJanz, DM
dc.contributor.authorJardine, TD
dc.date.accessioned2020-02-11T00:10:17Z
dc.date.available2020-02-11T00:10:17Z
dc.date.issued2016
dc.identifier.issn2161-9549en_US
dc.identifier.doi10.1086/688897en_US
dc.identifier.urihttp://hdl.handle.net/10072/391296
dc.description.abstractMethylmercury (MeHg) is a contaminant of concern because of its ability to biomagnify in aquatic food webs, resulting in potentially harmful concentrations in higher consumers. Beaver impoundments in the southern Canadian Rockies release bioavailable MeHg to downstream food webs. We examined the magnitude of uptake and trophic transfer of exported Hg (total Hg [THg] and MeHg) to grazing and predatory invertebrates and controls on these transfers by site-specific (dissolved organic C [DOC], MeHg in water, MeHg in diet) and individual (body size, trophic level) variables. Bioconcentration factors (BCFs) were high (79,756 ± 68,204) relative to values from the literature, declined with increasing MeHg in water, and did not differ above and below beaver ponds. Biomagnification factors (BMFs) for uptake from periphyton to grazers (18.3 ± 11.7) were high and increased with increasing DOC, BMFs from grazers to predators (2.1 ± 1.2) were low, and neither of these BMFs differed above and below ponds. Invertebrate body size had no effect on MeHg concentration. However, the relative difference in trophic level from prey to consumer was an important driver of BMFs, and MeHg in the diet was negatively associated with BMFs. Rates of uptake and transfer were greater at low than at higher concentrations, but overall trophic magnification through the food web (average trophic magnification factor = 2.3) was on the lower end of the typical range observed worldwide. Thus, the limited risk to wildlife and humans who consume fish from these systems is a result, in part, of a dampening of bioaccumulation as it is transmitted through these invertebrate food webs that exhibit weak size structuring relative to other aquatic systems.en_US
dc.description.peerreviewedYesen_US
dc.languageEnglishen_US
dc.publisherUniversity of Chicago Pressen_US
dc.relation.ispartofpagefrom1248en_US
dc.relation.ispartofpageto1262en_US
dc.relation.ispartofissue4en_US
dc.relation.ispartofjournalFreshwater Scienceen_US
dc.relation.ispartofvolume35en_US
dc.subject.fieldofresearchEcologyen_US
dc.subject.fieldofresearchOther Biological Sciencesen_US
dc.subject.fieldofresearchcode0602en_US
dc.subject.fieldofresearchcode0699en_US
dc.subject.keywordsScience & Technologyen_US
dc.subject.keywordsLife Sciences & Biomedicineen_US
dc.subject.keywordsMarine & Freshwater Biologyen_US
dc.subject.keywordsEnvironmental Sciences & Ecologyen_US
dc.titleBioaccumulation of mercury in invertebrate food webs of Canadian Rocky Mountain streamsen_US
dc.typeJournal articleen_US
dc.type.descriptionC1 - Articlesen_US
dcterms.bibliographicCitationPainter, KJ; Janz, DM; Jardine, TD, Bioaccumulation of mercury in invertebrate food webs of Canadian Rocky Mountain streams, Freshwater Science, 2016, 35 (4), pp. 1248-1262en_US
dc.date.updated2020-02-11T00:03:46Z
dc.description.versionPublisheden_US
gro.rights.copyright© 2016 The Society for Freshwater Science. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.en_US
gro.hasfulltextFull Text
gro.griffith.authorJardine, Timothy


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