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According to the Koppen -Geiger climate classification, Hokkaido and central to southern Alaska are located at near southrn and northern borders of the subarctic region, respectively. River basins in Hokkaido and Alaska receive similar climatological and hydrological conditions of summer to autumn rainfall, winter snowfall and spring snowmelt. Here, hydrological characteristics of the Saromabetsu river basin (area, 277.0 km super(2)) and the Oikamanai river basin (area, 62.0 km super(2)) in Hokkaido are compared with those of the Tanana river basin (area, 6.6310 super(4) km super(2)) in Alaska. Hourly time series of river discharge, Q, and suspended sediment concentration, C, in runoff events offers the relationship...
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This report describes the work performed by the Alaska Exotic Plant Management Team at Yukon-Charley Rivers National Preserve and Gates of the Arctic National Park & Preserve during the 2011 season including objectives, methods, and major conclusions. This field work is a continuation of work done by the Alaska Exotic Plant Management Team in the summer of 2010. The 2011 season was divided into four main regions from highest to lowest priority: Coal Creek Camp; Slaven’s Roadhouse; the Dalton Highway south of Coldfoot, AK; and Gates of the Arctic National Park & Preserve along the Middle Fork of the Koyukuk River. The main area of focus during the 2011 season was the high traffic areas along Coal Creek; a tributary...
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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...
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The ambermarked birch leafminer (AMBLM) (Profenusa thomsoni ) is an invasive leafminer native to the Palearctic from the United Kingdom to Turkey to Japan. It was introduced to the eastern United States in 1921 and has since spread to the mid-western U.S. states and Canadian provinces. This leafminer was introduced to Alaska in 1996, where it has since spread over 140,000 acres, from Haines to Fairbanks. The most severe damage is found throughout the Anchorage bowl, which extends south to Girdwood and North to Wasilla. The damage caused by P. thomsoni can be severe, defoliating entire trees. In 2006, it was noted that urban areas in Alaska experienced higher densities of AMBLM leafminer than adjacent forested areas....
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The Joint Technical Committee (JTC) of the United States and Canada serves as a scientific advisory body to the Yukon River Panel. The JTC discusses harvest and escapement goals, management trends, postseason reviews and preseason outlooks, and results of cooperative research projects. The report summarizes the status of salmon stocks (Chinook, coho, summer and fall chum salmon) in 2008 with reference to historical data, presents an outlook for the 2009 season, and provides data on the utilization of salmon species by commercial and subsistence (aboriginal) harvests, personal use (domestic) and sport (recreational) fishery. The report further compiles summaries of Yukon River projects (e.g., mark-recapture, sonar,...
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Hidden Creek Lake (HCL), an ice-marginal lake impounded by Kennicott Glacier, Wrangell Mountains, Alaska, fills annually to ∼20 to 30 × 106 m3 and then drains subglacially within 2 to 3 days. During the 1999 and 2000 jökulhlaups, we carried out a series of planned observations around the lake and in the Kennicott River, which drains the glacier. Approximately 20% of the lake volume was contained within a subglacial water “wedge” beneath the ice dam. The entire volume of the lake drains through the wedge; hydraulic head loss through this constriction may be responsible for the fairly symmetrical shape of the HCL outflow hydrographs, deduced from lake level records, basin hypsometry, and collapse of the ice dam. The...
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This report summarizes the inventory of mammals of the five park units comprising the Arctic Network (ARCN) of the National Park Service, Alaska Region, between 2000 and 2003. This study was part of a cooperative effort of the Beringian Coevolution Project at the Museum of Southwestern Biology, University of New Mexico, and the ARCN Inventory and Monitoring Program of the National Park Service, Alaska division. We begin documenting the approximately 39 species of mammals that live in ARCN, with a primary focus on small mammals (i.e., shrews, voles, lemmings, weasels, porcupine, squirrels, and hares). This survey resulted in more than 3,000 primary specimens comprising 23 species. Small mammal abundance varied considerably...
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The White River ash is one of the most distinct and widely dispersed pyroclastic deposits in Yukon-Alaska. It was produced from volcanic eruptions ca. 1887 (north lobe; Lerbekmo et al. 1975) and 1147 years B.P. (east lobe; Clague et al. 1995). The source of the deposit, Mount Churchill, is an ice-covered stratovolcano located 25 km west of the Yukon-Alaska border (61°25'N, 141°70'W). Distal deposits of ash occur as primary airfall over much of Alaska, Yukon, and Northwest Territories. Locally resedimented deposits of ash are common closer to the volcanic source and occur in highly glaciated regions. Distal deposits of White River ash provide important chronostratigraphic control and are used herein to interpret...
map background search result map search result map Assessment of Coho Salmon from the Kenai River, Alaska, 1997 Northwest Territories Protected Areas Strategy: Mackenzie Valley five-year action plan (2004-2009): conservation planning for pipeline development Yukon River salmon 2008 season summary and 2009 season outlook Angler Harvest Survey: Nares River 2009 Angler Harvest Survey: Bennet Lake 2009 Chinook Salmon Creel Survey and Inriver Gillnetting Study, Lower Kenai River, Alaska, 2009 Biotic interactions in temporal trends (1992–2010) of organochlorine contaminants in the aquatic food web of Lake Laberge, Yukon Territory Ecological effects of invasive European bird cherry (Prunus padus) on salmonid food webs in Anchorage, Alaska streams Integrated hydrologic and hydrochemical observations of Hidden Creek Lake jökulhlaups, Kennicott Glacier, Alaska Characteristics of runoffs in subarctic river basins; a comparison between Alaska and Hokkaido River discharge predicts spatial distributions of beluga whales in the Upper Cook Inlet, Alaska, during early summer Biological control of the ambermarked birch leafminer (Profenusa thomsoni) in Alaska Mammal inventory of Alaska's National Parks and Preserves, Arctic Network: Bering Land Bridge National Park, Cape Krusenstern National Monument, Kobuk Valley National Park, Noatak National Park, and Gates of the Arctic National Park and PreservePark and Preserve The World Turned Upside Down: A History of Mining on Coal Creek and Woodchopper Creek, Yukon-Charley Rivers National Preserve, Alaska “The Worst Thing We Had To Contend With”: Permafrost and Construction of the Alcan Highway Resedimentation of the late Holocene White River ash, Yukon Territory, Canada and Alaska, United States Invasive plant management in Yukon-Charley Rivers National Preserve and Gates of the ARctic National Park and Preserve: 2011 Summary Report Soil environment characteristics inventory and long-term monitoring in the Rock Creek Watershed, Denali National Park and Preserve, Alaska Cooperative Monitoring of River Flow on the Nabesna River (CAKN Streams & Rivers Resource Brief) Seasonal foraging strategies of Alaskan gray wolves (<i>Canis lupus</i>) in a salmon subsidized ecosystem Angler Harvest Survey: Nares River 2009 Integrated hydrologic and hydrochemical observations of Hidden Creek Lake jökulhlaups, Kennicott Glacier, Alaska Angler Harvest Survey: Bennet Lake 2009 Chinook Salmon Creel Survey and Inriver Gillnetting Study, Lower Kenai River, Alaska, 2009 Ecological effects of invasive European bird cherry (Prunus padus) on salmonid food webs in Anchorage, Alaska streams Biological control of the ambermarked birch leafminer (Profenusa thomsoni) in Alaska Biotic interactions in temporal trends (1992–2010) of organochlorine contaminants in the aquatic food web of Lake Laberge, Yukon Territory Assessment of Coho Salmon from the Kenai River, Alaska, 1997 The World Turned Upside Down: A History of Mining on Coal Creek and Woodchopper Creek, Yukon-Charley Rivers National Preserve, Alaska Seasonal foraging strategies of Alaskan gray wolves (<i>Canis lupus</i>) in a salmon subsidized ecosystem Soil environment characteristics inventory and long-term monitoring in the Rock Creek Watershed, Denali National Park and Preserve, Alaska Characteristics of runoffs in subarctic river basins; a comparison between Alaska and Hokkaido Cooperative Monitoring of River Flow on the Nabesna River (CAKN Streams & Rivers Resource Brief) River discharge predicts spatial distributions of beluga whales in the Upper Cook Inlet, Alaska, during early summer Mammal inventory of Alaska's National Parks and Preserves, Arctic Network: Bering Land Bridge National Park, Cape Krusenstern National Monument, Kobuk Valley National Park, Noatak National Park, and Gates of the Arctic National Park and PreservePark and Preserve “The Worst Thing We Had To Contend With”: Permafrost and Construction of the Alcan Highway Invasive plant management in Yukon-Charley Rivers National Preserve and Gates of the ARctic National Park and Preserve: 2011 Summary Report Resedimentation of the late Holocene White River ash, Yukon Territory, Canada and Alaska, United States Northwest Territories Protected Areas Strategy: Mackenzie Valley five-year action plan (2004-2009): conservation planning for pipeline development Yukon River salmon 2008 season summary and 2009 season outlook