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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...
Categories: Publication; Types: Citation; Tags: M1-Mammals
Categories: Publication; Types: Citation; Tags: M1-Birds
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
Categories: Publication; Types: Citation; Tags: M1-Birds
The following is a book review found at http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v416/n6882/full/416679a_fs.html in the journal Nature. Just as every picture tells a story, so too does every scientific project. This book is the story of the Kluane Boreal Forest Ecosystem Project, told brilliantly by the researchers who toiled for ten years from 1986 to uncover the drama and complexity of this Canadian ecosystem. Whoever wants to learn about the boreal forest of North America, one of the largest ecosystems of the world, and the stage on which a classic ecological drama — the ten-year population cycle of the snowshoe hare — is played out repeatedly, should definitely read this book. Equally...
map background search result map search result map Estimating snowshoe hare population density from pellet plots: a further evaluation 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? Why Do the Boreal Forest Ecosystems of Northwestern Europe Differ from Those of Western North America? Herbivores - Forest grouse and ptarmigan 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