Post-breeding distribution of Long-tailed Ducks Clangula hyemalis from the Yukon-Kuskokwim Delta, Alaska
Margaret R. Petersen, B. J. McCaffery, Paul L. Flint
2003, Wildfowl (54) 103-113
Breeding populations of Long-tailed Ducks Clangula hyemalis have declined in western Alaska, particularly on the Yukon-Kuskokwim (Y-K) Delta, and the species is currently considered a species of particular concern by the U.S. Fish & Wildlife Service in Alaska. Potential factors that may have contributed to this decline that occurred away...
A probable extralimital post-breeding assembly of Bufflehead Bucephala albeola in southcentral North Dakota, USA, 1994-2002
L.D. Igl
2003, Wildfowl (54) 81-93
The Bufflehead Bucephala albeola breeds predominantly in Canada and Alaska (USA). Evidence suggests that the species may have recently expanded its breeding range southward into central and south central North Dakota. This paper presents data on observations of Buffleheads during the breeding season in Kidder County, North Dakota, 1994-2002, and...
Life and death of the resurrection plate: Evidence for its existence and subduction in the northeastern Pacific in Paleocene-Eocene time
Peter J. Haeussler, Dwight Bradley, Ray E. Wells, Marti L. Miller
2003, Geological Society of America Bulletin (115) 867-880
Onshore evidence suggests that a plate is missing from published reconstructions of the northeastern Pacific Ooean in Paleocene- Eocene time. The Resurrection plate, named for the Resurrection Peninsula ophiolite near Seward, Alaska, was located east of the Kula plate and north of the Farallon plate. We interpret coeval near-trench magmatism...
Recurring middle Pleistocene outburst floods in east-central Alaska
D.G. Froese, D.G. Smith, J.A. Westgate, T. A. Ager, S.J. Preece, A. Sandhu, R.J. Enkin, F. Weber
2003, Quaternary Research (60) 50-62
Recurring glacial outburst floods from the Yukon-Tanana Upland are inferred from sediments exposed along the Yukon River near the mouth of Charley River in east-central Alaska. Deposits range from imbricate gravel and granules indicating flow locally extending up the Yukon valley, to more distal sediments consisting of at least 10...
Late Quaternary vegetation and climate history of the central Bering land bridge from St. Michael Island, western Alaska
T. A. Ager
2003, Quaternary Research (60) 19-32
Pollen analysis of a sediment core from Zagoskin Lake on St. Michael Island, northeast Bering Sea, provides a history of vegetation and climate for the central Bering land bridge and adjacent western Alaska for the past ???30,000 14C yr B.P. During the late middle Wisconsin interstadial (???30,000-26,000 14C yr B.P.)...
Statistical power for detecting trends with applications to seabird monitoring
Scott A. Hatch
2003, Biological Conservation (111) 317-329
Power analysis is helpful in defining goals for ecological monitoring and evaluating the performance of ongoing efforts. I examined detection standards proposed for population monitoring of seabirds using two programs (MONITOR and TRENDS) specially designed for power analysis of trend data. Neither program models within- and among-years components of variance...
Immobilization of free-ranging male pacific walruses (Odobenus rosmarus divergens) with carfentanil citrate and naltrexone hydrochloride
Daniel M. Mulcahy, P.A. Tuomi, Gerald W. Garner, Chadwick V. Jay
2003, Marine Mammal Science (19) 846-850
The major challenges in immobilization of free-ranging walruses (Odobenus rosmarus divergens) are to produce a deep level of anesthesia very quickly (to avoid darted animals from entering the water and drowning), and to find a drug or drug combination that requires only a small volume to be delivered by dart,...
Depositional environments and processes in Upper Cretaceous nonmarine and marine sediments, Ocean Point dinosaur locality, North Slope, Alaska
R. L. Phillips
2003, Cretaceous Research (24) 499-523
A 178-m-thick stratigraphic section exposed along the lower Colville River in northern Alaska, near Ocean Point, represents the uppermost part of a 1500 m Upper Cretaceous stratigraphic section. Strata exposed at Ocean Point are assigned to the Prince Creek and Schrader Bluff formations. Three major depositional environments are identified consisting,...
Clinical pathology and assessment of pathogen exposure in southern and Alaskan sea otters
K.D. Hanni, J.A.K. Mazet, F.M.D. Gulland, James A. Estes, M. Staedler, M.J. Murray, Melissa A. Miller, David A. Jessup
2003, Journal of Wildlife Diseases (39) 837-850
The southern sea otter (Enhydra lutris nereis) population in California (USA) and the Alaskan sea otter (E. lutris kenyoni) population in the Aleutian Islands (USA) chain have recently declined. In order to evaluate disease as a contributing factor to the declines, health assessments of these two sea otter populations were...
Metal dispersion and mobility in soils from the Lik Zn-Pb-Ag massive sulphide deposit, NW Alaska: Environmental and exploration implications
K.D. Kelley, D. L. Kelley
2003, Geochemistry: Exploration, Environment, Analysis (3) 179-195
The Lik deposit in northern Alaska is a largely unexposed shale-hosted Zn-Pb-Ag massive sulphide deposit that is underlain by continuous permafrost. Residual soils overlying the mineralized zone have element enrichments that are two to six times greater than baseline values. The most prominent elements are Ag, Mo, P, Se, Sr,...
Are corticosterone levels a good indicator of food availability and reproductive performance in a kittiwake colony?
Richard B. Lanctot, Scott A. Hatch, Verena A. Gill, Marcel Eens
2003, Hormones and Behavior (43) 489-502
We evaluated the use of corticosterone to gauge forage availability and predict reproductive performance in black-legged kittiwakes (Rissa tridactyla) breeding in Alaska during 1999 and 2000. We modeled the relationship between baseline levels of corticosterone and a suite of individual and temporal characteristics of the sampled birds. We also provided supplemental food...
The importance of genetic verification for determination of Atlantic salmon in north Pacific waters
J.L. Nielsen, I. Williams, G. Kevin Sage, Christian E. Zimmerman
2003, Journal of Fish Biology (62) 871-878
Genetic analyses of two unknown but putative Atlantic salmon Salmo salar captured in the Copper River drainage, Alaska, demonstrated the need for validation of morphologically unusual fishes. Mitochondrial DNA sequences (control region and cytochrome b) and data from two nuclear genes [first internal transcribed spacer (ITS-1) sequence and growth hormone...
Multiple seismogenic processes for high-frequency earthquakes at Katmai National Park, Alaska: Evidence from stress tensor inversions of fault-plane solutions
Seth C. Moran
2003, Bulletin of the Seismological Society of America (93) 94-108
The volcanological significance of seismicity within Katmai National Park has been debated since the first seismograph was installed in 1963, in part because Katmai seismicity consists almost entirely of high-frequency earthquakes that can be caused by a wide range of processes. I investigate this issue by determining 140 well-constrained first-motion...
Isotopic composition of carbon dioxide from a boreal forest fire: Inferring carbon loss from measurements and modeling
E.A.G. Schuur, S.E. Trumbore, M.C. Mack, J.W. Harden
2003, Global Biogeochemical Cycles (17)
Fire is an important pathway for carbon (C) loss from boreal forest ecosystems and has a strong effect on ecosystem C balance. Fires can range widely in severity, defined as the amount of vegetation and forest floor consumed by fire, depending on local fuel and climatic conditions. Here we...
Metamorphic origin of ore-forming fluids for orogenic gold-bearing quartz vein systems in the North American Cordillera: constraints from a reconnaissance study of δ15N, δD, and δ18O
Y. Jia, R. Kerrich, R. Goldfarb
2003, Economic Geology (98) 109-123
The western North American Cordillera hosts a large number of gold-bearing quartz vein systems from the Mother Lode of southern California, through counterparts in British Columbia and southeastern Alaska, to the Klondike district in central Yukon. These vein systems are structurally controlled by major fault zones, which are often reactivated...
Estimating lava volume by precision combination of multiple baseline spaceborne and airborne interferometric synthetic aperture radar: The 1997 eruption of Okmok Volcano, Alaska
Z. Lu, E. Fielding, M.R. Patrick, C. M. Trautwein
2003, IEEE Transactions on Geoscience and Remote Sensing (41) 1428-1436
Interferometric synthetic aperture radar (InSAR) techniques are used to calculate the volume of extrusion at Okmok volcano, Alaska by constructing precise digital elevation models (DEMs) that represent volcano topography before and after the 1997 eruption. The posteruption DEM is generated using airborne topographic synthetic aperture radar (TOPSAR) data where a...
Toxoplasma gondii, Neospora caninum, Sarcocystis neurona, and Sarcocystis canis-like infections in marine mammals
J. P. Dubey, R. Zarnke, N. J. Thomas, S.K. Wong, W. Vanbonn, M. Briggs, J.W. Davis, R. Ewing, M. Mense, O. C. H. Kwok, S. Romand, P. Thulliez
2003, Veterinary Parasitology (116) 275-296
Toxoplasma gondii, Neospora caninum, Sarcocystis neurona, and S. canis are related protozoans that can cause mortality in many species of domestic and wild animals. Recently, T. gondii and S. neurona were recognized to cause encephalitis in marine mammals. As yet, there is no report of natural exposure of N. caninum...
Radio tag retention and tag-related mortality among adult sockeye salmon
Kristina M. Ramstad, Carol Ann Woody
2003, North American Journal of Fisheries Management (23) 978-982
Tag retention and tag-related mortality are concerns for any tagging study but are rarely estimated. We assessed retention and mortality rates for esophageal radio tag implants in adult sockeye salmon Oncorhynchus nerka. Migrating sockeye salmon captured at the outlet of Lake Clark, Alaska, were implanted with one of four different...
Habitat characteristics of polar bear terrestrial maternal den sites in northern Alaska
George M. Durner, Steven C. Amstrup, Anthony S. Fischbach
2003, Arctic (56) 55-62
Polar bears (Ursus maritimus) give birth to and nurture their young in dens of ice and snow. During 1999-2001, we measured the structure of 22 dens on the coastal plain of northern Alaska after polar bear families had evacuated their dens in the spring. During the summers of 2001 and...
Sea otter population declines in the Aleutian Archipelago
Angela M. Doroff, James A. Estes, M. Tim Tinker, Douglas M. Burn, Thomas J. Evans
2003, Journal of Mammalogy (84) 55-64
Sea otter (Enhydra lutris) populations were exploited to near extinction and began to recover after the cessation of commercial hunting in 1911. Remnant colonies of sea otters in the Aleutian archipelago were among the first to recover; they continued to increase through the 1980s but declined abruptly during the 1990s....
Demography of Dall's sheep in northwestern Alaska
Christopher Kleckner, Mark S. Udevitz, Layne G. Adams, Brad S. Shults
2003, Arctic Research of the United States (16) 68-73
Dall’s sheep in northwestern Alaska declined in the early 1990s following the severe 1989-90 and 1990-91 winters. In the Baird Mountains of Noatak National Preserve, estimates of adult sheep declined by 50% from 800 in 1989 to under 400 in 1991. Population counts remained low throughout 1991 to 1996, reaching...
Improving size estimates of open animal populations by incorporating information on age
Bryan F.J. Manly, Trent L. McDonald, Steven C. Amstrup, Eric V. Regehr
2003, BioScience (53) 666-669
Around the world, a great deal of effort is expended each year to estimate the sizes of wild animal populations. Unfortunately, population size has proven to be one of the most intractable parameters to estimate. The capture-recapture estimation models most commonly used (of the Jolly-Seber type) are complicated and require...
High precision earthquake locations reveal seismogenic structure beneath Mammoth Mountain, California
Stephanie G. Prejean, Anna Stork, William L. Ellsworth, David Hill, Bruce R. Julian
2003, Geophysical Research Letters (30)
In 1989, an unusual earthquake swarm occurred beneath Mammoth Mountain that was probably associated with magmatic intrusion. To improve our understanding of this swarm, we relocated Mammoth Mountain earthquakes using a double difference algorithm. Relocated hypocenters reveal that most earthquakes occurred on two structures, a near-vertical plane at 7–9 km...
Return to Glacier Bay
James L. Bodkin
2003, Alaska Park Science (2) 5-12
Seven species of pigeons and doves were cultured for yeasts in the upper digestive tract. The following list gives the isolation rate for each columbid species and the yeasts cultured from them: feral pigeon Columba Livia (Gmelin) 95% -Candida albicans (Robin) Berkhout, C. tropicalis (Castellani) Berkhout, C. krusei (Cast.) Berkhout,...
Source model for the Mw 6.7, 23 October 2002, Nenana Mountain earthquake (Alaska) from InSAR
Tim J. Wright, Z. Lu, Charles Wicks
2003, Geophysical Research Letters (30) 12-1-12-4
The 23 October 2002 Nenana Mountain Earthquake (Mw ∼ 6.7) occurred on the Denali Fault (Alaska), to the west of the Mw ∼ 7.9 Denali Earthquake that ruptured the same fault 11 days later. We used 6 interferograms, constructed using radar images from the Canadian Radarsat-1 and European ERS-2 satellites,...
