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1.?Mixed-wood boreal forests are often considered to undergo directional succession from shade-intolerant to shade-tolerant species. It is thus expected that overstorey gaps should lead to the recruitment of shade-tolerant conifers into the canopy in all stand development stages and that the recruitment of shade-intolerant hardwoods would be minimal except in the largest gaps. 2.?We analysed short-term gap dynamics over a large 6-km2 spatial area of mixed-wood boreal forest across a gradient of stands in different developmental stages with different times of origin since fire (expressed as stand ?age?) that were affected differentially by the last spruce budworm (SBW) outbreak. Structural measurements of the canopy...
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The Yukon River Basin, underlain by discontinuous permafrost, has experienced a warming climate over the last century that has altered air temperature, precipitation, and permafrost. We investigated a water chemistry database from 1982 to 2014 for the Yukon River and its major tributary, the Tanana River. Significant increases of Ca, Mg, and Na annual flux were found in both rivers. Additionally, SO4 and P annual flux increased in the Yukon River. No annual trends were observed for dissolved organic carbon (DOC) from 2001 to 2014. In the Yukon River, Mg and SO4 flux increased throughout the year, while some of the most positive trends for Ca, Mg, Na, SO4, and P flux occurred during the fall and winter months. Both...
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During the 2012 field season, the Central Alaska Network (CAKN) Stream Monitoring Program made 130 site visits to 58 unique stream sites across the network (Figure 1), with each site being sampled one to five times from early May through late September. The data collected included instantaneous water chemistry, stream flow, water chemistry samples, macroinvertebrates, benthic diatoms, stable isotope samples, habitat data and environmental DNA samples. Continuous year-round temperature monitoring at 23 sites across the network is ongoing. At the request of DENA staff, the Stream Monitoring Program collected water chemistry, metals, invertebrates and diatoms from 7 sites in the Kantishna Hills. Active layer depth...
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"Regional land use planning in the Yukon has a long and unfortunate history of failed efforts. Under Chapter 11 of the Yukon First Nations Umbrella Final Agreement, a new process for planning has been in place since 1993. Through qualitative, interview-based research, I explore possible factors that either hinder or facilitate successful planning. I used the North Yukon regional land use planning effort as a case study example of the first plan to be successfully approved in Yukon history. A number of challenges resulting from poorly defined roles and responsibilities caused notable struggles and conflict throughout the process, but fortunately, strong political support and micro and meso –level organization,...
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This report contains water-quality and sediment-quality data from samples collected in the Yukon River Basin from March through September during the 2005 water year (WY). Samples were collected throughout the year at five stations in the basin (three on the main stem Yukon River, one each on the Tanana and Porcupine Rivers). A broad range of physical, chemical, and biological analyses are presented. This is the final report in a series of five USGS Open-File Reports spanning five WYs, from October 2000 through September 2005. The previous four reports are listed in the references (Schuster, 2003, 2005a, 2005b, 2006). Water-quality and sediment-quality data from samples collected on the Yukon River and selected...
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During the past 30 years bull trout (Salvelinus confluentus ) populations have declined in various watersheds across their range. The decline has been attributed to loss of habitat, over harvesting, habitat disturbance from resource development activities, and interaction with exotic species. The declining population trends observed over the past three decades suggest that this species is sensitive to impacts. In response to these declines, bull trout are listed as "Threatened" in the United States and "Sensitive" in Alberta, British Columbia, and the Yukon Territory. In the Northwest Territories bull trout are listed as "May Be at Risk" and are a candidate for a detailed risk assessment in the area. The presence...
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Pilfering is thought to play a role in the evolution of scatter-hoarding strategies; but is not well understood in larder-hoarding animals. I studied intraspecific pilfering in red squirrels in Kluane, YT, Canada. The purpose of this project was to estimate the natural rate of cache pilferage, and to examine variation in pilfering behaviour. Results from experimental removal of territory owners, suggested that younger squirrels with smaller food caches were more likely to pilfer when given the opportunity. Survival over-winter was dependent on the number of cones cached and pilfering squirrels were less likely to survive. Using a mark-recapture study of marked cones I found that few individuals (14%) did any pilfering...
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The identification of clear-sky and cloudy pixels is a key step in the processing of satellite observations. This is equally important for surface and cloud-atmosphere applications. In this paper, the Separation of Pixels Using Aggregated Rating over Canada (SPARC) algorithm is presented, a new method of pixel identification for image data from the Advanced Very High Resolution Radiometer (AVHRR) on board the NOAA satellites. The SPARC algorithm separates image pixels into clear-sky and cloudy categories based on a specially designed rating scheme. A mask depicting snow/ice and cloud shadows is also generated. The SPARC algorithm has been designed to work year-round (day and night) over the temperate and polar regions...
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Among the many recent developments explored in Canada's Changing North is the legal recognition of aboriginal rights by the Canadian state, which has led directly to significant increases in their political and economic power. It also examines how economic development, which has long focused on non-renewable natural resources, particularly minerals, has grown to an enormous scale. Development of arctic oil and gas, which hinges on world supplies and national and international politics, has meant major changes across the North. Some of the new national parks in the Canadian North are already under threat from mineral development. Northern tourism has made it possible for a wide variety of affluent visitors to visit...
map background search result map search result map Molecular Genetic Approaches in Wildlife Management  Dawson City community action plan on climate change forum report. Report prepared for the Yukon Fish and Wildlife Management Board.  The impact of invasive sweetclover (Melilotus alba) in early-successional floodplain habitats of Alaska Upper Yukon Area Plan Influence of Fire on Long-Term Patterns of Forest Succession in Alaskan Boreal Forests Interactions of multiple disturbances in shaping boreal forest dynamics: a spatially explicit analysis using multi-temporal lidar data and high-resolution imagery Assessing Yukon's current approach to regional land use planning: perspectives from the North Yukon planning process Intraspecific cache pilferage by larder-hoarding red squirrels (Tamiasciurus hudsonicus) in Kluane, Yukon Influence of the phenolic compound bearing species Ledum palustre on soil N cycling in a boreal hardwood forest Water and sediment quality in the Yukon River basin, Alaska, during water year 2005 Distribution, life history, and habitat use of bull trout ( Salvelinus confluentus) in mountain streams of the southern and central Northwest Territories Canada's Changing North Mackenzie Gas Project: Construction and Operation website Middle to Late Pleistocene ice extents, tephrochronology and paleoenvironments of the White River area, southwest Yukon CAKN Stream Monitoring Program 2012 Field Season Report Human Impacts on the Fire Regime of Interior Alaska: Interactions among Fuels, Ignition Sources, and Fire Suppression Response of the carbon cycle in sub-arctic black spruce forests to climate change: Reduction of a carbon sink related to the sensitivity of heterotrophic respiration [electronic resource] Arctic ground squirrel population collapse in the boreal forests of the Southern Yukon Multidecadal increases in the Yukon River Basin of chemical fluxes as indicators of changing flowpaths, groundwater, and permafrost  Dawson City community action plan on climate change forum report. Report prepared for the Yukon Fish and Wildlife Management Board.  Intraspecific cache pilferage by larder-hoarding red squirrels (Tamiasciurus hudsonicus) in Kluane, Yukon The impact of invasive sweetclover (Melilotus alba) in early-successional floodplain habitats of Alaska Molecular Genetic Approaches in Wildlife Management Middle to Late Pleistocene ice extents, tephrochronology and paleoenvironments of the White River area, southwest Yukon Arctic ground squirrel population collapse in the boreal forests of the Southern Yukon Upper Yukon Area Plan Distribution, life history, and habitat use of bull trout ( Salvelinus confluentus) in mountain streams of the southern and central Northwest Territories Assessing Yukon's current approach to regional land use planning: perspectives from the North Yukon planning process CAKN Stream Monitoring Program 2012 Field Season Report Human Impacts on the Fire Regime of Interior Alaska: Interactions among Fuels, Ignition Sources, and Fire Suppression Influence of Fire on Long-Term Patterns of Forest Succession in Alaskan Boreal Forests Mackenzie Gas Project: Construction and Operation website Response of the carbon cycle in sub-arctic black spruce forests to climate change: Reduction of a carbon sink related to the sensitivity of heterotrophic respiration [electronic resource] Water and sediment quality in the Yukon River basin, Alaska, during water year 2005 Multidecadal increases in the Yukon River Basin of chemical fluxes as indicators of changing flowpaths, groundwater, and permafrost Canada's Changing North Interactions of multiple disturbances in shaping boreal forest dynamics: a spatially explicit analysis using multi-temporal lidar data and high-resolution imagery