| Experimental evidence for a novel mechanism driving variation in habitat quality in a food-caching bird. | |
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MedLine Citation:
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PMID: 21681486 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Variation in habitat quality can have important consequences for fitness and population dynamics. For food-caching species, a critical determinant of habitat quality is normally the density of storable food, but it is also possible that quality is driven by the ability of habitats to preserve food items. The food-caching gray jay (Perisoreus canadensis) occupies year-round territories in the coniferous boreal and subalpine forests of North America, but does not use conifer seed crops as a source of food. Over the last 33 years, we found that the occupancy rate of territories in Algonquin Park (ON, Canada) has declined at a higher rate in territories with a lower proportion of conifers compared to those with a higher proportion. Individuals occupying territories with a low proportion of conifers were also less likely to successfully fledge young. Using chambers to simulate food caches, we conducted an experiment to examine the hypothesis that coniferous trees are better able to preserve the perishable food items stored in summer and fall than deciduous trees due to their antibacterial and antifungal properties. Over a 1-4 month exposure period, we found that mealworms, blueberries, and raisins all lost less weight when stored on spruce and pine trees compared to deciduous and other coniferous trees. Our results indicate a novel mechanism to explain how habitat quality may influence the fitness and population dynamics of food-caching animals, and has important implications for understanding range limits for boreal breeding animals. |
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Authors:
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Dan Strickland; Brian Kielstra; D Ryan Norris |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-6-17 |
Journal Detail:
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Title: Oecologia Volume: - ISSN: 1432-1939 ISO Abbreviation: - Publication Date: 2011 Jun |
Date Detail:
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Created Date: 2011-6-17 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0150372 Medline TA: Oecologia Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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, 1063 Oxtongue Lake Road, Dwight, ON, P0A 1H0, Canada. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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