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dc.contributor.supervisor Rasmussen, Joseph B.
dc.contributor.author Brinkmann, Lars
dc.date.accessioned 2015-04-29T18:27:19Z
dc.date.available 2015-04-29T18:27:19Z
dc.date.issued 2015
dc.identifier.uri https://hdl.handle.net/10133/3664
dc.description.abstract This project investigated the influence of community structure in reservoirs on trophodynamics, growth and mercury biomagnification in the apex consumer and fisheries target species northern pike (Esox lucius). Where lake whitefish (Coregonus clupeaformis) were abundant in the prey community, pike were found to be piscivorous, consuming predominantly lake whitefish and other large-bodied fish species. Benthivorous feeding behavior was observed in reservoirs without abundant lake whitefish stocks, and amphipods formed the predominant prey consumed by pike. Growth rates of pike were found to be significantly lower under the benthivorous trophic regime. Benthivorous pike had lower mercury concentrations, consistent with lower dietary exposure, than piscivorous pike, but higher biomagnification consistent with low food conversion efficiency and slower growth. A bioenergetics analysis showed elevated feeding rates and activity levels in benthivorous pike on a diet of comparatively low energy density, relative to piscivorous pike, confirming a trophic bottleneck in response to trophic simplification and highlighting the importance of trophic coupling between pelagic resources and apex consumers in reservoirs. en_US
dc.language.iso en en_US
dc.publisher Lethbridge, Alta. : University of Lethbridge, Dept. of Biological Sciences en_US
dc.relation.ispartofseries Thesis (University of Lethbridge. Faculty of Arts and Science) en_US
dc.subject northern pike en_US
dc.subject trophic bottleneck en_US
dc.subject mercury contamination en_US
dc.subject reservoirs en_US
dc.title The influence of food web structure on the diet, mercury dynamics and bioenergetics of northern pike in reservoirs of the upper South Saskatchewan River Basin en_US
dc.type Thesis en_US
dc.publisher.faculty Arts and Science en_US
dc.publisher.department Department of Biological Sciences en_US
dc.degree.level Ph.D en_US
dc.proquest.subject 0329 en_US
dc.proquest.subject 0792 en_US
dc.proquest.subject 0768 en_US
dc.proquestyes Yes en_US


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