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Chapter 5
Categories: Publication; Types: Citation; Tags: M1-Ecosystems
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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...
Predator satiation resulting from interannual reproductive synchrony has been widely documented in masting plants, but how reproductive synchrony within a year influences seed escape is poorly understood. We evaluated whether the intra-annual reproductive synchrony of individual white spruce trees (Picea glauca) increased seed escape from their primary predispersal seed predator, North American red squirrels (Tamiasciurus hudsonicus). Trees with cones that matured synchronously relative to those of other trees within red squirrel territories were significantly more likely to escape squirrel predation in years with both low and superabundant levels of cone production, generating a significantly positive linear selection...
Categories: Publication; Types: Citation; Tags: M1-Flora
Predation of white spruce (Picea glauca (Moench) Voss) cones by red squirrels (Tamiasciurus hudsonicus Erxleben) was quantified in the mixedwood boreal forest of Alberta in cutblocks with seed tree retention and in adjacent uncut forest, during 3 years with varying levels of cone crop (1998, 1999, 2000). Percent cone loss was quantified by comparison of paired pre- and post-caching photographs of tree crowns. Cone loss from seed trees in cutblocks was significantly lower than from control trees in adjacent uncut forest (48.5 vs. 54.9%). Although the number of cones produced per tree declined by 42% and the percentage of trees producing cones declined by approximately 48% between 1998 and 2000, there was no corresponding...
map background search result map search result map Expenditure freeze: the metabolic response of small mammals to cold environments 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 The role of red squirrels and arctic ground squirrels Experimental design and practical problems of implementation Herbivores - Forest grouse and ptarmigan Ecosystem Dynamics of the Boreal Forest: the Kluane Project Why Do the Boreal Forest Ecosystems of Northwestern Europe Differ from Those of Western North America? 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? Herbivores - Forest grouse and ptarmigan The role of red squirrels and arctic ground squirrels Experimental design and practical problems of implementation Estimating snowshoe hare population density from pellet plots: a further evaluation Ecosystem Dynamics of the Boreal Forest: the Kluane Project The Community Ecological Monitoring Program Annual Report 2008 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?