Experimental evidence and over forty years of monitoring data show that food limits reproductive success in a boreal food-caching passerine

dc.contributor.advisorNorris, D. Ryan
dc.contributor.authorDerbyshire, Rachael
dc.date.accessioned2014-09-17T17:43:02Z
dc.date.available2014-09-17T17:43:02Z
dc.date.copyright2014-08
dc.date.created2014-09-15
dc.date.issued2014-09-17
dc.degree.departmentDepartment of Integrative Biologyen_US
dc.degree.grantorUniversity of Guelphen_US
dc.degree.nameMaster of Scienceen_US
dc.degree.programmeIntegrative Biologyen_US
dc.description.abstractFood caching is a unique behaviour undertaken by several species of birds and mammals to overcome periods of food scarcity, but it is virtually unknown whether caching species are food-limited. The gray jay (Perisoreus canadensis) is a boreal resident passerine that stores food during the late summer and fall and breeds in late winter when fresh food is scarce. Using a two-year experiment and 43 years of monitoring data, we tested the food limitation hypothesis in a declining population of gray jays in Algonquin Provincial Park, ON, Canada. Females that were supplemented both experimentally and by park visitors laid eggs earlier in the season and raised more nestlings. Females that were supplemented by park visitors also had larger clutches than non-supplemented females. Nestling condition was not influenced by food supplementation. Our results support the food-limitation hypothesis and have important implications for understanding the mechanism driving the decline in this population.en_US
dc.description.sponsorshipOntario Graduate Scholarship
dc.description.sponsorshipW. Garfield Weston Foundation Fellowship for Northern Conservation
dc.description.sponsorshipNatural Sciences and Engineering Council
dc.description.sponsorshipQueen Elizabeth II Graduate Scholarship in Science and Technology
dc.description.sponsorshipSociety of Canadian Ornithologists
dc.description.sponsorshipAnimal Behaviour Society
dc.description.sponsorshipAssociation of Field Ornithologists
dc.description.sponsorshipEastern Bird Banding Association
dc.description.sponsorshipSigma Xi
dc.identifier.urihttp://hdl.handle.net/10214/8472
dc.language.isoenen_US
dc.publisherUniversity of Guelphen_US
dc.rights.licenseAll items in the Atrium are protected by copyright with all rights reserved unless otherwise indicated.
dc.subjectGray Jayen_US
dc.subjectfood supplementationen_US
dc.subjectPerisoreus canadensisen_US
dc.subjectpopulation declineen_US
dc.subjectpublic feedingen_US
dc.subjectreproductionen_US
dc.titleExperimental evidence and over forty years of monitoring data show that food limits reproductive success in a boreal food-caching passerineen_US
dc.typeThesisen_US

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