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dc.contributor.authorHatton, Elizabeth Courtney
dc.contributor.otherQueen's University (Kingston, Ont.). Theses (Queen's University (Kingston, Ont.))en
dc.date2008-01-08 18:35:37.289en
dc.date2008-01-10 22:00:22.188en
dc.date.accessioned2008-01-15T19:01:32Z
dc.date.available2008-01-15T19:01:32Z
dc.date.issued2008-01-15T19:01:32Z
dc.identifier.urihttp://hdl.handle.net/1974/984
dc.descriptionThesis (Master, Biology) -- Queen's University, 2008-01-10 22:00:22.188en
dc.description.abstractBythotrephes longimanus, a predatory exotic cladoceran, has spread rapidly to numerous lakes through the Laurentian Great Lakes region of Ontario and North America. Post-invaded lakes are known to have reduced zooplankton species richness, biomass and altered community structure. Bythotrephes may also affect the diet and trophic position of macroinvertebrate predators and prey species for fish (e.g., Mysis relicta). However, the effects of this species in altering higher trophic levels remain largely unexamined. Using a combined approach of stable isotope (d13C and d15N) and THg analysis, the trophic position of Bythotrephes in two invaded lakes was investigated. Based on d15N values, Bythotrephes shared a similar trophic position to native macroinvertebrate predators (9 and 7‰ for Peninsula and Harp lakes, respectively). Using a mixing model and stomach content analysis we show that, despite low and patchy lake abundance, Bythotrephes may be a key prey item to fish and has approximate dietary contributions similar to native prey items, such as zooplankton, Chaoborus and Mysis. In both lakes, Hg conformed to predicted biomagnification trends as indicated by 15N. When Bythotrephes invades lakes with native macroinvertebrate predators, it inserts itself into the same trophic position and does not have major effects on food web length.en
dc.format.extent493234 bytes
dc.format.mimetypeapplication/pdf
dc.languageenen
dc.language.isoenen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectBythotrephesen
dc.subjectmercuryen
dc.subjectstable isotope analysisen
dc.subjectaquaticen
dc.titleThe Role of Invasive Bythotrephes longimanus in Lake Food Websen
dc.typeThesisen
dc.description.degreeMasteren
dc.contributor.supervisorArnott, Shelley E.en
dc.contributor.supervisorCampbell, Linda M.en
dc.contributor.departmentBiologyen


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