Skip to main content
USGS - science for a changing world
Advanced Search

Filters: Tags: Baseline 5-Data (X)

325 results (11ms)   

View Results as: JSON ATOM CSV
thumbnail
During the period 1970-2000, substantial efforts were made to document the distribution and number of Trumpeter Swans (Cygnus buccinator) in western Canada. Breeding surveys have expanded from covering less than 20,000 km2 in the Grande Prairie region of Alberta to cover 780,000 km2, perhaps one-third of northwestern Canada. Aerial surveys involving total or partial counts have been used in most areas. Since 1995, sample-based surveys have been used in Yukon Territory and extreme northern British Columbia. Between 1970 and 2000, breeding surveys have documented a dramatic increase in both breeding distribution and numbers in western Canada (100 to more than 3,700). Winter surveys in British Columbia have corroborated...
thumbnail
Invasive species are a concern worldwide as they can displace native species, reduce biodiversity, and disrupt ecological processes. European bird cherry (Prunus padus) (EBC) is an invasive ornamental tree that is rapidly spreading and possibly displacing native trees along streams in parts of urban Alaska. The objectives of this study were to: 1) map the current distribution of EBC along two Anchorage streams, Campbell and Chester creeks, and 2) determine the effects of EBC on selected ecological processes linked to stream salmon food webs. Data from the 2009 and 2010 field seasons showed: EBC was widely distributed along Campbell and Chester creeks; EBC leaf litter in streams broke down rapidly and supported similar...
thumbnail
North American caribou (Rangifer tarandus) herds commonly exhibit little nuclear genetic differentiation among adjacent herds, although available evidence supports strong demographic separation, even for herds with seasonal range overlap. During 1997–2003, we studied the Mentasta and Nelchina caribou herds in south-central Alaska using radiotelemetry to determine individual movements and range overlap during the breeding season, and nuclear and mitochondrial DNA (mtDNA) markers to assess levels of genetic differentiation. Although the herds were considered discrete because females calved in separate regions, individual movements and breeding-range overlap in some years provided opportunity for male-mediated gene...
thumbnail
Studies moose or Alces alces, caribou or Rangifer tarandus and grizzly bear or Ursus arctos distribution in relation to road traffic in Denali National Park, Alaska. Development of wildlife monitoring system using 19 landscape level viewsheds stratified into four sections based on decreasing traffic along the road corridor; Absence of traffic avoidance patterns for caribou and grizzly bears.
thumbnail
Nutritional restrictions in winter may reduce the availability of protein for reproduction and survival in northern ungulates. We refined a technique that uses recently voided excreta on snow to assess protein status in wild caribou (Rangifer tarandus) in late winter. Our study was the first application of this non-invasive, isotopic approach to assess protein status of wild caribou by determining dietary and endogenous contributions of nitrogen (N) to urinary urea. We used isotopic ratios of N (?15N) in urine and fecal samples to estimate the proportion of urea N derived from body N (p-UN) in pregnant, adult females of the Chisana Herd, a small population that ranged across the Alaska-Yukon border. We took advantage...
thumbnail
Report is divided into three sections. In Section I, an overview of the Arctic-Yukon-Kuskokwim Management Area is provided, including a description of the area and subareas, Board of Fish activities, and management information and activities. In Section II, effort and harvest results are presented. In Section III, more detailed summaries of major fisheries and activities are provided
thumbnail
A content analysis of PCMB meeting minutes from its first meeting to 1993 reveals a repeated pattern of communication in which Native hunters pose questions about the need for caribou research requiring the use of aircraft and collars and the handling of animals, and a response by agency managers to inform community residents about the value of collars in science and/or demonstrating their application. Never discussed openly at PCMB meetings was what the Gwich'in regard as a negotiated order of power-sharing arrangement between Gwich'in and caribou, established in the time before there was time, nunh ttrotsit ultsui gwuno (when the earth was first made), when caribou were people and people were caribou. As told...


map background search result map search result map Ecological effects of invasive European bird cherry (Prunus padus) on salmonid food webs in Anchorage, Alaska streams Fishery Management Report for Sport Fisheries in the Arctic-Yukon- Kuskokwim Management Area, 1999-2000 An isotopic approach to measuring nitrogen balance in caribou Population Structure and Genetic Diversity of Moose in Alaska River discharge predicts spatial distributions of beluga whales in the Upper Cook Inlet, Alaska, during early summer Species Listing under Canada's Species at Risk Act Using temporary dye marks to estimate ungulate population abundance in southwest Yukon, Canada Population characteristics, space use and habitat selection of two non-migratory caribou herds in central Alaska, 1994 - 2009 Western Arctic caribou herd winter habitat monitoring and utilization, 1995-1996 Adult Salmon Runs and Streamflow Data at a Resistance Board Weir on Beaver Creek, Alaska, 1998-2000 Little Rancheria Caribou in the Yukon: Evaluation of Winter Habitat Quality and Habitat Use Caribou Hunters and Researchers at the Co-management Interface: Emergent Dilemmas and the Dynamics of Legitimacy in Power Sharing Trumpeter Swan Numbers and Distribution in Western Canada, 1970-2000 Moose, Caribou, and Grizzly Bear Distribution in Relation to Road Traffic in Denali National Park, Alaska Downstream Migrations of Juvenile Salmon and Other Fishes in the Upper Yukon River Range overlap and individual movements during breeding season influence genetic relationships of caribou herds in south-central Alaska Sonar estimation of chum salmon passage in the Aniak River, 2009 Adult Salmon Runs and Streamflow Data at a Resistance Board Weir on Beaver Creek, Alaska, 1998-2000 Ecological effects of invasive European bird cherry (Prunus padus) on salmonid food webs in Anchorage, Alaska streams Sonar estimation of chum salmon passage in the Aniak River, 2009 Using temporary dye marks to estimate ungulate population abundance in southwest Yukon, Canada Moose, Caribou, and Grizzly Bear Distribution in Relation to Road Traffic in Denali National Park, Alaska Range overlap and individual movements during breeding season influence genetic relationships of caribou herds in south-central Alaska An isotopic approach to measuring nitrogen balance in caribou River discharge predicts spatial distributions of beluga whales in the Upper Cook Inlet, Alaska, during early summer Population characteristics, space use and habitat selection of two non-migratory caribou herds in central Alaska, 1994 - 2009 Population Structure and Genetic Diversity of Moose in Alaska Little Rancheria Caribou in the Yukon: Evaluation of Winter Habitat Quality and Habitat Use Caribou Hunters and Researchers at the Co-management Interface: Emergent Dilemmas and the Dynamics of Legitimacy in Power Sharing Western Arctic caribou herd winter habitat monitoring and utilization, 1995-1996 Downstream Migrations of Juvenile Salmon and Other Fishes in the Upper Yukon River Fishery Management Report for Sport Fisheries in the Arctic-Yukon- Kuskokwim Management Area, 1999-2000 Trumpeter Swan Numbers and Distribution in Western Canada, 1970-2000 Species Listing under Canada's Species at Risk Act