A biochemical genetic study of zoogeography of lake whitefish, Coregonus clupeaformis, in western Canada in relation to their possible survival in a Nahanni glacial refugium

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dc.contributor.authorFoote, Christopher Johnen_US
dc.date.accessioned2012-05-18T19:10:49Z
dc.date.available2012-05-18T19:10:49Z
dc.date.issued1980en_US
dc.degree.disciplineZoologyen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractLake whitefish, Coregonus clupeaformis, populations from across western Canada were studied in reference to their isolation and subsequent dispersal from separate glacial refugia. Frequencies of alleles of the genes governing electrophoretic phenotypes of glycerol-3-phosphate dehydrogenase (G-3-PDH), heart-type lactate dehydrogenase (LDH) and isocitrate dehydrogenase (IDH) proved useful for characterizing populations. Hemoglobin electrophoretic phenotypes and modal gillraker numbers for each population were useful in discerning differences among large groups of populations. Three biochemically distinct population groups of lake whitefish were found in western Canada and it is suggested that the most plausible hypothesis to account for the genetic integrity and geographical distribution of these groups is that they have separate origins in glacial refugia. Selection did not appear to account for the present genetic distinctions between the groups. It has been shown previously that lake whitefish probably survived the Wisconsin glaciation in both the Bering and Mississippi-Missouri glacial refugia. Recent geological evidence and the results of the present study regarding the distribution of populations of one of the groups favour isolation and dispersal from an additional refugium in the area of the present Nahanni National Park, N.W.T... Contact of the different refugial forms appears to have led to introgression in some cases but, in general, most populations remain genetically distinct even in the absence of physical barriers to gene flow.en_US
dc.format.extentxi [i.e. xii], 125 leaves :en_US
dc.identifierocm72771189en_US
dc.identifier.urihttp://hdl.handle.net/1993/6646
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.titleA biochemical genetic study of zoogeography of lake whitefish, Coregonus clupeaformis, in western Canada in relation to their possible survival in a Nahanni glacial refugiumen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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