Geochemical constraints on the genesis of the Scheelite dome intrusion-related gold deposit, Tombstone gold belt, Yukon, Canada
J.L. Mair, R.J. Goldfarb, C. A. Johnson, C.J.R. Hart, E.E. Marsh
2006, Economic Geology (101) 523-553
The Scheelite dome intrusion-related gold deposit, western Selwyn basin, Yukon, is hosted in hornfelsed metasedimentary strata that lie adjacent to the exposed apices of a monzogranite to quartz monzonite plutonic complex of the mid-Cretaceous Tombstone-Tungsten magmatic belt, Tintina gold province, Alaska and Yukon. A variety of mineralization styles occur throughout...
Spatial and temporal variation in sea otter demography
M. Tim Tinker, Daniel F. Doak, James A. Estes, Brian B. Hatfield, Michelle M. Steadler, James L. Bodkin
M. Tim Tinker, James A. Estes, Katherine Ralls, Terrie M. Williams, David A. Jessup, Daniel P. Costa, editor(s)
2006, Book chapter, Population dynamics and biology of the California sea otter (<i>Enhydra lutris nereis</i>) at the southern end of its range
1) Better information on historical and current population dynamics is central to understanding patterns of growth and decline in the California sea otter population. We developed a maximum likelihood-based analytical method to estimate historical age/sex specific vital rates as well as spatial and temporal variation in vital rates from longitudinal...
Demography, genetics, and the value of mixed messages
John M. Pearce, Sandra L. Talbot
2006, Condor (108) 474-479
Iverson et al. (2004) used estimates of the homing rate for molting adult Harlequin Ducks (Histrionicus histrionicus) in Alaska to draw inferences about population structure. Homing rates, defined as one minus the ratio of birds recaptured elsewhere to those recaptured at the original banding site, were high (0.95–1.00) for males...
Surveillance for Asian H5N1 avian influenza in the United States
S. Ip, Paul G. Slota
2006, Fact Sheet 2006-3025
Increasing concern over the potential for migratory birds to introduce the Asian H5N1 strain of avian influenza to North America prompted the White House Policy Coordinating Committee for Pandemic Influenza Preparedness to request that the U.S. Departments of Agriculture (USDA) and Interior (DOI) develop a plan for the early detection...
Application of airborne thermal imagery to surveys of Pacific walrus
D. M. Burn, M.A. Webber, Mark S. Udevitz
2006, Wildlife Society Bulletin (34) 51-58
We conducted tests of airborne thermal imagery of Pacific walrus to determine if this technology can be used to detect walrus groups on sea ice and estimate the number of walruses present in each group. In April 2002 we collected thermal imagery of 37 walrus groups in the Bering Sea...
Sizing up oil on Alaska's North Slope
K. J. Bird, D.W. Houseknecht
2006, Geotimes (51) 24-27
[No abstract available]...
Gas hydrate potential of the mid Atlantic outer continental shelf
William W. Shedd, Deborah R. Hutchinson
2006, Fire in the Ice: NETL Methane Hydrate Newsletter (6) 8-9
For the last two years, the Minerals Management Service (MMS) has been studying the resource potential of gas hydrates in federal offshore lands of the Outer Continental Shelf (OCS) off the Atlantic, Gulf of Mexico, Pacific, and Alaska in collaboration with the U.S. Geological Survey (USGS), the Department of Energy...
Far-field effects of early Tertiary ridge subduction in Alaska
D. C. Bradley, R.M. Friedman, P.W. Layer, Peter J. Haeussler, A.B. Till, S. M. Roeske, Marti L. Miller
2006, Conference Paper, Geological Society of America Abstracts with Programs Specialty Meeting No 2:91
No abstract available. ...
Steelhead of the south-central/southern California coast: Population characterization for recovery planning
David A. Boughton, P.B. Adams, E. Anderson, Craig Fusaro, E. Keller, Elsie Kelley, Leo Lentsch, J. L. Nielsen, Katie Perry, Helen Regan, C. Swift, Fred Watson
2006, Report
This report by the National Marine Fisheries Service applies a formal evaluation framework to the problem of delineating Oncorhynchus mykiss populations in the South-Central/Southern California Coast recovery domain, in support of recovery planning under the Endangered Species Act....
Tracking the movements of Denali's wolves
T.J. Meier, John W. Burch, Layne G. Adams
2006, Alaska Park Science
The wolves of Denali National Park (formerly Mount McKinley National Park) were the subject of some of the earliest research on wolf ecology. From 1939 to 1941, Adolph Murie performed groundbreaking studies of wolves, observing wolves and their prey and collecting wolf scats and prey remains. His work resulted in...
Wave energy dissipation by intertidal sand waves on a mixed-sediment Beach
P. Adams, P. Ruggiero
2006, Conference Paper, Coastal Dynamics 2005 - Proceedings of the Fifth Coastal Dynamics International Conference
Within the surf zone, the energy expended by wave breaking is strongly influenced by nearshore bathymetry, which is often linked to the character and abundance of local sediments. Based upon a continuous, two year record of Argus Beach Monitoring System (ABMS) data on the north shore of Kachemak Bay in...
Biogeochemical characterization of an undisturbed highly acidic, metal-rich bryophyte habitat, east-central Alaska, U.S.A.
L. P. Gough, R. G. Eppinger, Paul H. Briggs, S. Giles
2006, Arctic, Antarctic, and Alpine Research (38) 522-529
We report on the geochemistry of soil and bryophyte-laden sediment and on the biogeochemistry of willows growing in an undisturbed volcanogenic massive sulfide deposit in the Alaska Range ecoregion of east-central Alaska. We also describe an unusual bryophyte assemblage found growing in the acidic metal-rich waters that drain the area....
Incorporating diverse data and realistic complexity into demographic estimation procedures for sea otters
M. Timothy Tinker, Daniel F. Doak, James A. Estes, Brian B. Hatfield, Michelle M. Staedler, Arthur Gross
2006, Ecological Applications (16) 2293-2312
Reliable information on historical and current population dynamics is central to understanding patterns of growth and decline in animal populations. We developed a maximum likelihood-based analysis to estimate spatial and temporal trends in age/sex-specific survival rates for the threatened southern sea otter (Enhydra lutris nereis), using annual population censuses and...
Pelagic seabird surveys in the Tuamotu and Gambier Archipelagos, French Polynesia
Eric A. Vanderwerf, Ray J. Pierce, Verena A. Gill, Graham Wragg, Philippe Raust, T. Lee Tibbitts
2006, Marine Ornithology: Journal of Seabird Research and Conservation (34) 65-70
We conducted pelagic seabird surveys in the Gambier and Tuamotu Archipelagos in the southeastern Pacific Ocean totaling 40 hours during 7-27 March 2003 and 22.5 hours during 22-27 July 2001. We used a 300-m-wide strip transect to estimate seabird density, and we estimated relative abundance of birds at all distances....
Crustal insights from gravity and aeromagnetic analysis: Central North Slope, Alaska
R. W. Saltus, C. J. Potter, J. D. Phillips
2006, American Association of Petroleum Geologists Bulletin (90) 1495-1517
Aeromagnetic and gravity data are processed and interpreted to reveal deep and shallow information about the crustal structure of the central North Slope, Alaska. Regional aeromagnetic anomalies primarily reflect deep crustal features. Regional gravity anomalies are more complex and require detailed analysis. We constrain our geophysical models with seismic data...
Net carbon exchange across the Arctic tundra-boreal forest transition in Alaska 1981-2000
Catharine Copass Thompson, A. D. McGuire, Joy S. Clein, F. S. Chapin III, J. Beringer
2006, Conference Paper, Mitigation and Adaptation Strategies for Global Change
Shifts in the carbon balance of high-latitude ecosystems could result from differential responses of vegetation and soil processes to changing moisture and temperature regimes and to a lengthening of the growing season. Although shrub expansion and northward movement of treeline should increase carbon inputs, the effects of these vegetation changes...
Recent observations of intraspecific predation and cannibalism among polar bears in the southern Beaufort Sea
Steven C. Amstrup, I. Stirling, T. S. Smith, C. Perham, G.W. Thiemann
2006, Polar Biology (29) 997-1002
Intraspecific killing has been reported among polar bears (Ursus maritimus), brown bears (U. arctos), and black bears (U. americanus). Although cannibalism is one motivation for such killings, the ecological factors mediating such events are poorly understood. Between 24 January and 10 April 2004, we confirmed three instances of intraspecific predation...
Seasonal migration and environmental conditions of Pacific halibut Hippoglossus stenolepis, elucidated from pop-up archival transmitting (PAT) tags
Timothy Loher, Andrew C. Seitz
2006, Marine Ecology Progress Series (317) 259-271
Pop-up archival transmitting (PAT) tags were used to study the fall migration of halibut in the Gulf of Alaska (GOA). We tagged 6 Pacific halibut Hippoglossus stenolepis on summer feeding grounds in the eastern GOA and another 6 in the western GOA from June 13 to August 6, 2002. The...
Numerical simulation of tsunami generation by cold volcanic mass flows at Augustine Volcano, Alaska
C. F. Waythomas, P. Watts, J. S. Walder
2006, Natural Hazards and Earth System Sciences (6) 671-685
Many of the world's active volcanoes are situated on or near coastlines. During eruptions, diverse geophysical mass flows, including pyroclastic flows, debris avalanches, and lahars, can deliver large volumes of unconsolidated debris to the ocean in a short period of time and thereby generate tsunamis. Deposits of both hot and...
A 16-year time series of 1 km AVHRR satellite data of the conterminous United States and Alaska
Jeff Eidenshink
2006, Photogrammetric Engineering and Remote Sensing (72) 1027-1035
The U.S. Geological Survey (USGS) has developed a 16-year time series of vegetation condition information for the conterminous United States and Alaska using 1 km Advanced Very High Resolution Radiometer (AVHRR) data. The AVHRR data have been processed using consistent methods that account for radiometric variability due to calibration uncertainty,...
Abrupt transitions during sustained explosive eruptions: Examples from the 1912 eruption of Novarupta, Alaska
N.K. Adams, Bruce F. Houghton, W. Hildreth
2006, Bulletin of Volcanology (69) 189-206
Plinian/ignimbrite activity stopped briefly and abruptly 16 and 45 h after commencement of the 1912 Novarupta eruption defining three episodes of explosive volcanism before finally giving way after 60 h to effusion of lava domes. We focus here on the processes leading to the termination of the second and third...
Persistence of 10-year old Exxon Valdez oil on Gulf of Alaska beaches: The importance of boulder-armoring
Gail V. Irvine, Daniel H. Mann, Jeffrey W. Short
2006, Marine Pollution Bulletin (52) 1011-1022
Oil stranded as a result of the 1989 Exxon Valdez spill has persisted for >10 years at study sites on Gulf of Alaska shores distant from the spill's origin. These sites were contaminated by "oil mousse", which persists in these settings due to armoring of underlying sediments and their included...
Effects of El Niño on distribution and reproductive performance of Black Brant
James S. Sedinger, David H. Ward, Jason L. Schamber, William I. Butler, William D. Eldridge, Bruce Conant, James F. Voelzer, Nathan Chelgren, Mark P. Herzog
2006, Ecology (87) 151-159
Climate in low-latitude wintering areas may influence temperate and high-latitude breeding populations of birds, but demonstrations of such relationships have been rare because of difficulties in linking wintering with breeding populations. We used long-term aerial surveys in Mexican wintering areas and breeding areas in Alaska, USA, to assess numbers of...
Site-specific effects on productivity of an upper trophic-level marine predator: Bottom-up, top-down, and mismatch effects on reproduction in a colonial seabird
R.M. Suryan, D.B. Irons, E.D. Brown, P.G.R. Jodice, D.D. Roby
2006, Progress in Oceanography (68) 303-328
We investigated the relative roles of bottom-up and top-down factors in limiting productivity of an upper trophic level marine predator. Our primary working hypothesis was that the reproductive success of black-legged kittiwakes (Rissa tridactyla) a piscivorous, colonial-nesting seabird, was most limited by the abundance, distribution, and species composition of surface-schooling...
Growth history of Kilauea inferred from volatile concentrations in submarine-collected basalts
Michelle L. Coombs, Thomas W. Sisson, Peter W. Lipman
2006, Journal of Volcanology and Geothermal Research (151) 19-49
Major-element and volatile (H2O, CO2, S) compositions of glasses from the submarine flanks of Kilauea Volcano record its growth from pre-shield into tholeiite shield-stage. Pillow lavas of mildly alkalic basalt at 2600–1900 mbsl on the upper slope of the south flank are an intermediate link...
