The taxonomy of three sympatric species of ciscoes in northern Manitoba

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dc.contributor.authorClarke, Redmond McV.en_US
dc.date.accessioned2009-12-02T16:47:51Z
dc.date.available2009-12-02T16:47:51Z
dc.date.issued1970en_US
dc.degree.disciplineZoologyen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstract664 ciscoes were analyzed from 12 northern Manitoba lakes sampled in 1967 and 1968. In Big Athapap, Coregonus reighardi was distinguished from two sibling species (C, artedii and C. hoyi) by its vertical premaxillae, included lower jaw, terete body and 24 to 36 short gillrakers. Discriminant function analysis separated the sibling species. The three species differed in their lateral line scales, pectoral and pelvic rays, gillrakers, gillraker length, lower jaw, head length, eye diameter, pectoral length and pigmentation, dentition, supraethmoid bone, and growth rate. Body depth of all species, and gillraker number of C. artedii were correlated with maximum lake depth. Correlation and factor analysis confirmed the identifications. Differences between the species from Big Athapap and the Great Lakes and L. Nipigon are probably non-genetic. C. zenithicus C. reighardi may be ecophenotypes of one species, as may C. artedii and C. nigripinnis; C. hoyi and C. kiyi; and johannae and C. alpenae. In Big Athapap, C. reighardi was the most benthic and C. artedii the most pelagic. C. reighardi ate the greatest per cent volume of benthic and bentho-pelagic organisms, C. hoyi of plankton, and C. artedii of surface organisms. All species are autumn spawners; the atypical spanning time of C. hoyi and C. reighardi (compared with the Great Lakes) is associated with their most northerly known occurrence.en_US
dc.format.extent77 leaves :en_US
dc.format.extent3544889 bytes
dc.format.mimetypeapplication/pdf
dc.identifierocm72759534en_US
dc.identifier.urihttp://hdl.handle.net/1993/3529
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.rightsThe reproduction of this thesis has been made available by authority of the copyright owner solely for the purpose of private study and research, and may only be reproduced and copied as permitted by copyright laws or with express written authorization from the copyright owner.en_US
dc.titleThe taxonomy of three sympatric species of ciscoes in northern Manitobaen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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