The relative effects of food concentration and predation in controlling tropical ciliate populations

dc.contributor.advisorLynn, Denis H.
dc.contributor.authorGransden, Scott G.
dc.date.accessioned2020-12-03T15:26:22Z
dc.date.available2020-12-03T15:26:22Z
dc.date.copyright1997
dc.degree.departmentDepartment of Zoologyen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.description.abstractThe effects of food concentration and predation on the regulation of tropical planktonic ciliate communities were assessed. Ciliate abundances, biomasses, and growth rates were estimated following nutrient and predator manipulations at 2 tropical sites of different trophic status. Initial ciliate abundances and biomasses were higher at the eutrophic Kingston Harbour station than at the oligotrophic Discovery Bay station. Following in situ manipulations at both sites, it was found that the ciliates at Discovery Bay were food regulated while the ciliates of Kingston Harbour were regulated by their predators. Size fractionation incubations at Kingston Harbour revealed that the greatest predation pressures were acting upon the ciliates in the 600 $\mu$m treatments and were lowest upon the ciliates in the 45 $\mu$m treatments. Thus, this tropical ciliate community is apparently regulated by bottom-up control at the oligotrophic Discovery Bay site, and by top-down control at the eutrophic Kingston Harbour site.en_US
dc.identifier.urihttps://hdl.handle.net/10214/21749
dc.language.isoen
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectfood concentrationen_US
dc.subjectpredationen_US
dc.subjectregulationen_US
dc.subjecttropicalen_US
dc.subjectplanktonic ciliate communitiesen_US
dc.subjectabundanceen_US
dc.subjectbiomassen_US
dc.subjectgrowth ratesen_US
dc.subjectnutrienten_US
dc.subjectpredatoren_US
dc.titleThe relative effects of food concentration and predation in controlling tropical ciliate populationsen_US
dc.typeThesisen_US

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