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

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dc.contributor.advisor Norris, D. Ryan
dc.contributor.author Derbyshire, Rachael
dc.date.accessioned 2014-09-17T17:43:02Z
dc.date.available 2014-09-17T17:43:02Z
dc.date.copyright 2014-08
dc.date.created 2014-09-15
dc.date.issued 2014-09-17
dc.identifier.uri http://hdl.handle.net/10214/8472
dc.description.abstract Food 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.sponsorship This work was supported by an Ontario Graduate Scholarship, the W. Garfield Weston Foundation Fellowship for Northern Conservation, the Natural Sciences and Engineering Council, the Queen Elizabeth II Graduate Scholarship in Science and Technology, the Society of Canadian Ornithologists, the Animal Behaviour Society, the Association of Field Ornithologists, the Eastern Bird Banding Association, and Sigma Xi. en_US
dc.language.iso en en_US
dc.subject Gray Jay en_US
dc.subject food supplementation en_US
dc.subject Perisoreus canadensis en_US
dc.subject population decline en_US
dc.subject public feeding en_US
dc.subject reproduction en_US
dc.title Experimental evidence and over forty years of monitoring data show that food limits reproductive success in a boreal food-caching passerine en_US
dc.type Thesis en_US
dc.degree.programme Integrative Biology en_US
dc.degree.name Master of Science en_US
dc.degree.department Department of Integrative Biology en_US
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