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Increased light reaching streams as a result of riparian vegetation management is often thought to be responsible for enhanced algal productivity. However, concomitant changes in nutrients and other physical processes confound that interpretation. We manipulated light in two separate experiments to test the role of light as a controlling factor for periphyton productivity and biomass, and to observe invertebrate responses in small streams in central British Columbia, Canada. We did this by adding artificial light to reaches of three forested streams, and in a second experiment we used shadecloth to cover reaches of two streams flowing through clearcuts. Periphyton growth, productivity and composition, and macroinvertebrate...
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In Canada, little is known about the governance of private protected areas (PPAs) and their contribution to the public interest. This dissertation evaluates the extent to which PPAs in Canada adhere to generally advanced principles of good governance---Direction, Legitimacy, Fairness, Performance and Accountability---and it assesses their contribution to the public interest. Findings from descriptive analysis of six case studies of Individual, Corporate, Non-Government and First Nation authorities indicate that principles are adhered to with relative vigor and visibility and that the public interest is generally advanced. The governance pattern is not strongly differentiated and it is generally uniform in strengths...
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Pattern and extent of treeline change using sequential vertical aerial photography in the northern section of the Kluane Ranges of southwest Yukon are examined. One of the most common predictions is that continued global temperature increases will cause the tree-line to advance in elevation and latitude. Comparison of aerial photographs of southwest Yukon indicates significant changes in the spruce forest-shrub tundra transition. Many areas exhibit increased growth of individual spruce without an increase in stand density or an advance in spruce distribution. Increase in the elevational distribution of spruce is observed in comparatively fewer areas, typically in combination with other two types of change.
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Aim? Using a new approach to analyse fossil pollen data, we investigate temporal and spatial patterns in Populus (poplar, cottonwood, aspen) from the Late Glacial to the present at regional to continental scales. Location? North America. Methods? We extracted data on the timing and magnitude of the maximum value of Populus pollen from each pollen diagram in the North American Pollen Database (NAPD). The information was plotted in histograms of 150-year bins to identify times when Populus was abundant on the landscape. We also mapped the maximum values to identify spatial patterns and their causes. Results? Our analyses show that there have been several periods since the Late Glacial when Populus was abundant on...
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Analyzes the quantitative framework for breeding and conservation of forest tree genetic resources in British Columbia. Relevance of the methods use in integrating breeding with conservation population Role of in- and ex-situ populations on forest tree gene resource management; Genetic conservation objectives of in situ-populations.
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There is a trend towards development of Wrangell-St. Elias National Park to accomodate increased visitor use and to generate additional tourism revenue for the state of Alaska. Master planning should be utilized in setting Park goals, zoning areas for visitor use and wilderness, and ensuring that developments do not erode the conservation values of the Park. Specifically, information on grizzly bears should be incorporated carefully into planning recreational facilities in order to avoid important grizzly bear habitats. Fundamental measures designed to minimize bear-human conflicts should include management of human food and garbage; public education on bears; monitoring of bear data; problem bear control; planning...
map background search result map search result map  Invasive Plant Management Guidance, McGrath, AK Invasive Plant Management Nixon Fork Mine, AK Governance of private protected areas in Canada: Advancing the public interest? Climate Change and Hazard Zonation in the Circum-Arctic Permafrost Regions The influence of coyote on Canada lynx populations assessed at two different spatial scales RELATIONSHIPS AMONG FIRES, FUNGI, AND SOIL DYNAMICS IN ALASKAN BOREAL FORESTS Holocene treeline dynamics in the mountains of northeastern British Columbia, Canada, inferred from fossil pollen and stomata Factors Affecting Diurnal Activity of Fishers in North-Central British Columbia Stand-level Attributes of Snowshoe Hare (Lepus americanus) Habitat in a Post-Fire Trembling Aspen (Populus tremuloides) Chronosequence in Central Yukon Impact of doubled CO2 on the interaction between the global and regional water cycles in four study regions Experimental increases and reductions of light to streams: effects on periphyton and macroinvertebrate assemblages in a coniferous forest landscape A quantitative framework for breeding and conservation of forest tree genetic resources in British Columbia Influence of repeated fertilization on forest ecosystems: relative habitat use by snowshoe hares (Lepus americanus) Uncertainty of 21st century growing stocks and GHG balance of forests in British Columbia, Canada resulting from potential climate change impacts on ecosystem processes [electronic resource] Trophic interactions, community organization, and the Kluane ecosystem Climate and snowpack monitoring progress report 2011: Arctic Network Preliminary Wrangell-St Elias National Park & Preserve Bear Management Plan Overview (Discussion Points) Evidence of Recent Treeline Dynamics in Southwest Yukon from Aerial Photographs Invasive Plant Management Nixon Fork Mine, AK  Invasive Plant Management Guidance, McGrath, AK Experimental increases and reductions of light to streams: effects on periphyton and macroinvertebrate assemblages in a coniferous forest landscape RELATIONSHIPS AMONG FIRES, FUNGI, AND SOIL DYNAMICS IN ALASKAN BOREAL FORESTS Governance of private protected areas in Canada: Advancing the public interest? Stand-level Attributes of Snowshoe Hare (Lepus americanus) Habitat in a Post-Fire Trembling Aspen (Populus tremuloides) Chronosequence in Central Yukon Trophic interactions, community organization, and the Kluane ecosystem Preliminary Wrangell-St Elias National Park & Preserve Bear Management Plan Overview (Discussion Points) Evidence of Recent Treeline Dynamics in Southwest Yukon from Aerial Photographs Climate and snowpack monitoring progress report 2011: Arctic Network Holocene treeline dynamics in the mountains of northeastern British Columbia, Canada, inferred from fossil pollen and stomata Impact of doubled CO2 on the interaction between the global and regional water cycles in four study regions Factors Affecting Diurnal Activity of Fishers in North-Central British Columbia Influence of repeated fertilization on forest ecosystems: relative habitat use by snowshoe hares (Lepus americanus) Uncertainty of 21st century growing stocks and GHG balance of forests in British Columbia, Canada resulting from potential climate change impacts on ecosystem processes [electronic resource] A quantitative framework for breeding and conservation of forest tree genetic resources in British Columbia Climate Change and Hazard Zonation in the Circum-Arctic Permafrost Regions The influence of coyote on Canada lynx populations assessed at two different spatial scales