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The boreal forests of North America are undergoing major changes because of the direct effects of global warming and increased CO sub(2) levels. Plant production in the boreal forest is nutrient limited, and we examined how long-term fertilization affected growth of white spruce Picea glauca in the face of these major changes. We conducted a large-scale experiment by fertilizing two 1 km super(2) stands of white spruce in the southwestern Yukon with commercial NPK fertilizer from 1987 to 1994. Tree growth was measured by the width of annual increments in 60 trees from each of 2 control and of 2 matched fertilized 1 km super(2) sites for the period from 1977 to 1997 in a before, during, and after experimental design....
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Small mammals in boreal forest ecosystems fluctuate dramatically in abundance and 1 possible mechanism to explain these changes is the bottom-up hypothesis of variation in food supplies. Here we ask if variation in berry crops produced by 6 major species of dwarf shrubs and herbs, epigeous mushroom crops, and white spruce seeds allow us to predict changes in the abundance of the red-backed vole (Myodes [= Clethrionomys] rutilus), the deer mouse (Peromyscus maniculatus), and field voles (Microtus oeconomus and M. pennsylvanicus combined) over 13 years (1997-2009) in the Kluane Lake region of the southwestern Yukon, Canada. M. rutilus is the dominant rodent in these forests, comprising 64% of the catch. Overwinter...
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We review the population dynamics of red-backed voles (Myodes species) in North America, the main deciduous and coniferous forest-dwelling microtines on this continent, and compare and contrast their pattern with that of the same or similar species in Eurasia. We identify 7 long-term studies of population changes in Myodes in North America. Using autoregressive and spectral analysis, we found that only 2 of the 7 show 3- to 5-year cycles like those found in some Eurasian populations. There was no relationship between latitude and cycling. The general lack of cyclicity is associated with two key aspects of their demography that act in tandem: first, poor overwinter survival in most years; second, chronically low...
map background search result map search result map The Community Ecological Monitoring Program Annual Report 2013 Do changes in berry crops drive population fluctuations in small rodents in the southwestern Yukon? Density estimation for small mammals from livetrapping grids: rodents in northern Canada Population dynamics of red-backed voles (Myodes) in North America Population limitation of the northern red-backed vole in the boreal forests of northern Canada The Community Ecological Monitoring Program Annual Report 2008 Climate and nutrient influences on the growth of white spruce trees in the boreal forests of the Yukon Seasonal changes in glucocorticoid and testosterone concentrations in free-living arctic ground squirrels from the boreal forest of the Yukon 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 Great Horned Owls Arctic ground squirrel population collapse in the boreal forests of the Southern Yukon 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? You can hide but you can't run: apparent competition, predator responses and the decline of Arctic ground squirrels in boreal forest of the southwest Yukon 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? Climate and nutrient influences on the growth of white spruce trees in the boreal forests of the Yukon Density estimation for small mammals from livetrapping grids: rodents in northern Canada You can hide but you can't run: apparent competition, predator responses and the decline of Arctic ground squirrels in boreal forest of the southwest Yukon Herbivores - Forest grouse and ptarmigan The Community Ecological Monitoring Program Annual Report 2013 The role of red squirrels and arctic ground squirrels Voles and mice Experimental design and practical problems of implementation Great Horned Owls Arctic ground squirrel population collapse in the boreal forests of the Southern Yukon Do changes in berry crops drive population fluctuations in small rodents in the southwestern Yukon? Seasonal changes in glucocorticoid and testosterone concentrations in free-living arctic ground squirrels from the boreal forest of the Yukon 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 Population dynamics of red-backed voles (Myodes) in North America What factors determine cyclic amplitude in the snowshoe hare (Lepus americanus) cycle? Population limitation of the northern red-backed vole in the boreal forests of northern Canada