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The present study used overlapping burn scars from natural wildfires to examine the effects of changes in the fire-free interval on early successional plant communities in boreal forests of central Yukon Territory, Canada. Data on plant community composition and residual organic material were collected in the first decade of post-fire regeneration in two study areas with recent fire overlap. Sites with a shorter fire-free interval had reduced loads of deadwood and shallower organic layers after the most recent fire. Multivariate analysis of species cover indicated that sites in and out of the burn overlap zones also supported distinct plant communities. Differences in the plant communities were associated with a...
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This paper discusses the application of digital terrain analysis modeling techniques to the parameterization of a semi-distributed hydrologic model. Most current techniques for deriving physiographic parameters in watershed analyses, including those using commercial geographic information systems (GIS), are tedious, costly and time consuming. The demands of these techniques result in them usually being limited in practical application to deriving parameters at only one level of detail or for only one set of sub-basins. This paper presents a computerized interface (SLURPAZ) that was developed to combine the output of an established digital terrain analysis model (TOPAZ) with digital land cover data to derive all...
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Pogo Mine Project: An Introduction The Project: The proposed Pogo Gold Mine would be located about 38 miles northeast of Delta Junction, Alaska, near the Goodpaster River (see figure 1). Teck-Pogo, Inc., the "applicant," plans to develop the mine on state-owned land. It would be an underground mine with a surface mill producing up to 500,000 ounces of gold each year. The applicant hopes to begin construction in 2002, and proposes to operate the mine 24 hours a day, 365 days a year, for about 12 years. This predicted mine-life is based on existing information; on-going exploration could increase the life of the mine. The project would employ up to 385 employees. Workers would be housed on site. An airstrip would...
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The fundamental niche of a species is rarely if ever realized because the presence of other species restricts it to a narrower range of ecological conditions. The effects of this narrower range of conditions define how resources are partitioned. Resource partitioning has been inferred but not demonstrated previously for sympatric ursids. We estimated assimilated diet in relation to body condition (body fat and lean and total body mass) and reproduction for sympatric brown bears (Ursus arctos) and American black bears (U. americanus) in south-central Alaska, 1998?2000. Based on isotopic analysis of blood and keratin in claws, salmon (Oncorhynchus spp.) predominated in brown bear diets (>53% annually) whereas black...
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Concerns about wildland fuel levels and a growing wildland-urban interface (WUI) have pushed wildland fire risk mitigation strategies to the forefront of fire management activities. Mechanical (e.g., shearblading) and manual (e.g., thinning) fuel treatments have become the preferred strategy of many fire managers and agencies. This Joint Fire Science Program funded project seeks to document and quantify mechanical and manual fuel treatment effects on fire behavior. Alaska's Federal and State fire management agencies have identified this 'data gap' as their most important fire science research need and priority. The Nenana Ridge Ruffed Grouse Project Area is 6,000 acres of typical interior Alaska boreal forest located...
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Sexual segregation occurs frequently in sexually dimorphic species, and it may be influenced by differential habitat requirements between sexes or by social or evolutionary mechanisms that maintain separation of sexes regardless of habitat selection. Understanding the degree of sex-specific habitat specialization is important for management of wildlife populations and the design of monitoring and research programs. Using mid-summer aerial survey data for Dall’s sheep (Ovis dalli dalli) in southern Alaska during 1983–2011, we assessed differences in summer habitat selection by sex and reproductive status at the landscape scale in Wrangell-St. Elias National Park and Preserve (WRST). Males and females were highly...
map background search result map search result map Quaternary Geology of the Yukon Territory Moose population survey, western Yukon Flats: Game Management Unit 25D, Yukon Flats National Wildlife Refuge, October 26 to November 15, 2000 Quantifying the effects of fuels reduction treatments on fire behavior and post-fire vegetation dynamics - Final Report to the Joint Fire Science Program.  Method for Attenuation of White Phosphorus Contamination in Wetlands EIELSON AIR FORCE BASE: Site Information Exploratory Models of Intersite Variability in Mid to Late Holocene Central Alaska Integrated Analysis of Genetic, Stable Isotope, and Banding Data Reveal Migratory Connectivity and Flyways in the Northern Yellow Warbler (Dendroica petechia; Aestiva group) Response of boreal plant communities to variations in previous fire-free interval Using digital terrain analysis modeling techniques for the parameterization of a hydrologic model Herbivores - Forest grouse and ptarmigan Geometry of oriented lakes in Old Crow Flats, northern Yukon Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia INTERSPECIFIC RESOURCE PARTITIONING IN SYMPATRIC URSIDS POGO Gold Mine EIS/NEPA Project Potential natural and anthropogenic impediments to the conservation and recovery of Cook Inlet beluga whales, Delphinapterus leucas Summer habitat selection by Dall’s sheep in Wrangell-St. Elias National Park and Preserve, Alaska Yukon lce Patches: Role of lce-entombed Bryophytes in Alpine EIELSON AIR FORCE BASE: Site Information Quantifying the effects of fuels reduction treatments on fire behavior and post-fire vegetation dynamics - Final Report to the Joint Fire Science Program.  Method for Attenuation of White Phosphorus Contamination in Wetlands Integrated Analysis of Genetic, Stable Isotope, and Banding Data Reveal Migratory Connectivity and Flyways in the Northern Yellow Warbler (Dendroica petechia; Aestiva group) POGO Gold Mine EIS/NEPA Project Response of boreal plant communities to variations in previous fire-free interval Late-glacial alpine glacier advance and early Holocene tephras, northern British Columbia Geometry of oriented lakes in Old Crow Flats, northern Yukon Herbivores - Forest grouse and ptarmigan Summer habitat selection by Dall’s sheep in Wrangell-St. Elias National Park and Preserve, Alaska Moose population survey, western Yukon Flats: Game Management Unit 25D, Yukon Flats National Wildlife Refuge, October 26 to November 15, 2000 Potential natural and anthropogenic impediments to the conservation and recovery of Cook Inlet beluga whales, Delphinapterus leucas Yukon lce Patches: Role of lce-entombed Bryophytes in Alpine INTERSPECIFIC RESOURCE PARTITIONING IN SYMPATRIC URSIDS Exploratory Models of Intersite Variability in Mid to Late Holocene Central Alaska Using digital terrain analysis modeling techniques for the parameterization of a hydrologic model Quaternary Geology of the Yukon Territory