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A diet analysis of two zooplanktivores, the non-indigenous rainbow smelt (Osmerus mordax) and the native cisco (Coregonus artedi) in Lake Winnipeg, Manitoba

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dc.contributor.supervisor Hann, Brenda (Biological Sciences) Davoren, Gail (Biological Sciences) en_US
dc.contributor.author Olynyk, Andrew John
dc.date.accessioned 2013-04-03T14:59:15Z
dc.date.available 2013-04-03T14:59:15Z
dc.date.issued 2013-04-03
dc.identifier.uri http://hdl.handle.net/1993/18325
dc.description.abstract Diets of two zooplanktivores were studied in Lake Winnipeg: the non-indigenous rainbow smelt (Osmerus mordax) and the native cisco (Coregonus artedi). Gut contents of smelt (70-130 mm total length) and cisco (100-200 mm TL) were concurrently collected with zooplankton (integrated vertical tows) from pre-determined locations throughout Lake Winnipeg in 2010 and 2011. When spatially separated, both zooplanktivores showed similar shifts from preference for fast-moving copepods during low total zooplankton density to slow-moving large cladocerans (Daphnia spp. and Eubosmina sp.) during high total zooplankton density. When spatially overlapped in the North Basin, dietary overlap was high between smelt and cisco, but possible vertical segregation was apparent during daylight-dark trawls. Diel variation in smelt diet was minimal. Overall, impact of smelt on the food web seemed weaker than in other smelt-invaded lakes, potentially owing to the warm, shallow nature of Lake Winnipeg providing a poorer quality habitat than cooler, deeper lakes. en_US
dc.subject Aquatic ecology en_US
dc.subject Invasive species en_US
dc.title A diet analysis of two zooplanktivores, the non-indigenous rainbow smelt (Osmerus mordax) and the native cisco (Coregonus artedi) in Lake Winnipeg, Manitoba en_US
dc.degree.discipline Biological Sciences en_US
dc.contributor.examiningcommittee Roth, Jim (Biological Sciences) Paterson, Michael (Entomology) en_US
dc.degree.level Master of Science (M.Sc.) en_US
dc.description.note May 2013 en_US


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