Ecological divergence between emerald and spottail shiners (Notropis) in Lake Manitoba

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dc.contributor.authorBernard, Donald Jeanen_US
dc.date.accessioned2009-12-02T16:52:26Z
dc.date.available2009-12-02T16:52:26Z
dc.date.issued1972en_US
dc.degree.disciplineZoologyen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractIn Lake Manitoba two cyprinid species (Notropis) occur sympatrically and show ecological divergence. In July and August the fry of emerald shiners were near the surface in the limnetic zone while spottail shiners appeared to be littoral. By September both species were most abundant near shore and, overlapped in vertical distribution. Emerald shiner fry fed on plankton, and spottail shiner fry on plankton and bottom foods. Emerald shiners of age I and older in May and June were mainly in offshore surface waters and at shoal edges occupying the whole water column. Spottail shiners of age I and older were near the bottom onshore in the shoal waters. As the season progressed, spottail shiners appeared to move offshore and off the bottom, while emerald shiners moved on to shoal waters but were most abundant near the surface or midwater. Emerald shiners showed a diel onshore-offshore movement, which occurred at irregular times in June, July and August, and a diel vertical movement to the surface at night in June and July. Spottail shiners showed, no diel movements but appeared to be inactive between dusk and dawn. The diet of both species reflected their spatial distribution. Emerald shiners fed primarily on plankton, and spottail shiners ate mainly bottom food but both shared a common diet of Diptera larva in July. The ecological segregation between the two cohabiting congeneric species is possibly due to selective segregation.en_US
dc.format.extentx, 97 p. :en_US
dc.format.extent4212533 bytes
dc.format.mimetypeapplication/pdf
dc.identifierocm72748801en_US
dc.identifier.urihttp://hdl.handle.net/1993/3557
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.titleEcological divergence between emerald and spottail shiners (Notropis) in Lake Manitobaen_US
dc.typemaster thesisen_US
local.subject.manitobayesen_US
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