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There is renewed focus on the ecological determinants of animal metabolism and recent comparative analyses support the physiological expectation that the field metabolic rate (FMR) of homeotherms should increase with declining ambient temperature. However, sustained elevation of FMR during prolonged, seasonal cold could be prevented by intrinsic limits constraining FMR to some multiple of basal metabolic rate (BMR) or extrinsic limits on resource abundance. We analysed previous measures of mammalian FMR and BMR to establish the effect of ambient temperature on both traits and found no support for intrinsic limitation. We also measured the FMR of a northern population of red squirrels (Tamiasciurus hudsonicus) exposed...
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Kin recognition can facilitate kin selection and may have played a role in the evolution of sociality. Red squirrels (Tamiasciurus hudsonicus) defend territories using vocalizations known as rattles. They use rattles to discriminate kin, though the mechanism underlying this ability is unknown. Our objective was to distinguish between the mechanisms of prior association, where animals learn the phenotypes of kin they associate with early in life, and phenotype matching/recognition alleles, where animals use a template to match phenotypes, thereby allowing them to recognize kin without an association early in life. We used audio playbacks to measure the responses of squirrels to rattles from familiar kin, unfamiliar...
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Neonatal reproductive failure should occur when energetic costs of parental investment outweigh fitness benefits. However, little is known about the drivers of neonatal reproductive failure in free-ranging species experiencing continuous natural variation in predator abundance and in the energetic and fitness costs and benefits associated with parental investment., Long-term comprehensive studies are required to better understand how biotic, abiotic and life-history conditions interact to drive occurrences of reproductive failure in the wild., Using 24 years (1987-2011) of reproductive data from a northern boreal population of North American red squirrels in south-western Yukon, we examined the effects of predator...
map background search result map search result map The functional response of a hoarding seed predator to mast seeding The Community Ecological Monitoring Program Annual Report 2013 Behavioral responses of territorial red squirrels to natural and experimental variation in population density Expenditure freeze: the metabolic response of small mammals to cold environments Intraspecific cache pilferage by larder-hoarding red squirrels (Tamiasciurus hudsonicus) The Community Ecological Monitoring Program Annual Report 2008 What factors determine cyclic amplitude in the snowshoe hare (Lepus americanus) cycle? Estimating snowshoe hare population density from pellet plots: a further evaluation Predators, energetics and fitness drive neonatal reproductive failure in red squirrels The role of red squirrels and arctic ground squirrels Experimental design and practical problems of implementation Herbivores - Forest grouse and ptarmigan Great Horned Owls Other herbivores and small predators - Arthropods, birds, and mammals Testing hypotheses of community organization for the Kluane ecosystem Ecosystem Dynamics of the Boreal Forest: the Kluane Project Voles and mice Why Do the Boreal Forest Ecosystems of Northwestern Europe Differ from Those of Western North America? Using playback of territorial calls to investigate mechanisms of kin discrimination in red squirrels The impact of rewilding, species introductions and climate change on the structure and function of the Yukon boreal forest ecosystem Why Do the Boreal Forest Ecosystems of Northwestern Europe Differ from Those of Western North America? Predators, energetics and fitness drive neonatal reproductive failure in red squirrels Herbivores - Forest grouse and ptarmigan Other herbivores and small predators - Arthropods, birds, and mammals The Community Ecological Monitoring Program Annual Report 2013 Intraspecific cache pilferage by larder-hoarding red squirrels (Tamiasciurus hudsonicus) The role of red squirrels and arctic ground squirrels Voles and mice Experimental design and practical problems of implementation Great Horned Owls Testing hypotheses of community organization for the Kluane ecosystem Behavioral responses of territorial red squirrels to natural and experimental variation in population density Estimating snowshoe hare population density from pellet plots: a further evaluation Using playback of territorial calls to investigate mechanisms of kin discrimination in red squirrels Ecosystem Dynamics of the Boreal Forest: the Kluane Project The Community Ecological Monitoring Program Annual Report 2008 The functional response of a hoarding seed predator to mast seeding The impact of rewilding, species introductions and climate change on the structure and function of the Yukon boreal forest ecosystem Expenditure freeze: the metabolic response of small mammals to cold environments What factors determine cyclic amplitude in the snowshoe hare (Lepus americanus) cycle?