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dc.contributor.authorPrestie, K
dc.contributor.authorPhillips, ID
dc.contributor.authorChivers, DP
dc.contributor.authorJardine, TD
dc.date.accessioned2020-02-02T22:14:50Z
dc.date.available2020-02-02T22:14:50Z
dc.date.issued2019
dc.identifier.issn0706-652X
dc.identifier.doi10.1139/cjfas-2018-0455
dc.identifier.urihttp://hdl.handle.net/10072/390888
dc.description.abstractLake food web structure dictates the flow of energy and contaminants to top predators, and addition of invasive species can shift these flows. We examined trophic position (TP), proportional reliance on the littoral zone (Proplittoral), and mercury (Hg) concentrations across the life-span of two predatory fishes, walleye (Sander vitreus) and northern pike (Esox lucius), in lakes with and without invasive virile crayfish (Faxonius virilis). The littoral zone was the dominant foraging zone for both species regardless of size, accounting for 59% and 80% of the diet of walleye and pike, respectively. Both species increased in TP and Hg with body size, as did crayfish. Walleye in crayfish-present lakes had lower Proplittoral, TP, and Hg concentrations compared with non-present lakes, but trophic magnification of Hg through the food web was consistent across all six lakes. These findings underscore a strong role for the littoral zone in channeling energy and contaminants to higher trophic levels and how invasive species can occupy new habitats at low abundance while altering food web structure and contaminant bioaccumulation.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherCanadian Science Publishing
dc.relation.ispartofpagefrom1929
dc.relation.ispartofpageto1939
dc.relation.ispartofissue11
dc.relation.ispartofjournalCanadian Journal of Fisheries and Aquatic Sciences
dc.relation.ispartofvolume76
dc.subject.fieldofresearchEcology
dc.subject.fieldofresearchZoology
dc.subject.fieldofresearchFisheries Sciences
dc.subject.fieldofresearchcode0602
dc.subject.fieldofresearchcode0608
dc.subject.fieldofresearchcode0704
dc.titleEffects of ontogeny and invasive crayfish on feeding ecology and mercury concentrations of predatory fishes
dc.typeJournal article
dc.type.descriptionC1 - Articles
dcterms.bibliographicCitationPrestie, K; Phillips, ID; Chivers, DP; Jardine, TD, Effects of ontogeny and invasive crayfish on feeding ecology and mercury concentrations of predatory fishes, Canadian Journal of Fisheries and Aquatic Sciences, 2019, 76 (11), pp. 1929-1939
dc.date.updated2020-01-24T05:36:18Z
dc.description.versionPost-print
gro.rights.copyright© The Author(s) 2019. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorJardine, Timothy


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