Survival of breeding Pacific common eiders on the Yukon-Kuskokwim Delta, Alaska
H.M. Wilson, Paul L. Flint, Christine L. Moran, A.N. Powell
2007, Journal of Wildlife Management (71) 403-410
Populations of Pacific common eiders (Somateria mollissima v-nigrum) breeding in Alaska, USA, have declined markedly over the past 40 years. We studied survival of adult female Pacific common eiders using capture—recapture of nesting hens at 3 sites on the Yukon-Kuskokwim Delta (YKD), Alaska from 1994 to 2004. We used data...
The USGS national geothermal resource assessment: An update
C.F. Williams, M.J. Reed, S.P. Galanis Jr., J. DeAngelo
2007, Conference Paper, Transactions - Geothermal Resources Council
The U. S. Geological Survey (USGS) is working with the Department of Energy's (DOE) Geothermal Technologies Program and other geothermal organizations on a three-year effort to produce an updated assessment of available geothermal resources. The new assessment will introduce significant changes in the models for geothermal energy recovery factors, estimates...
Signatures of mountain building: Detrital zircon U/Pb ages from northeast Tibet
Richard O. Lease, Douglas W. Burbank, George E. Gehrels, Zhicai Wang, Daoyang Yuan
2007, Geology (35) 239-242
Although detrital zircon has proven to be a powerful tool for determining provenance, past work has focused primarily on delimiting regional source terranes. Here we explore the limits of spatial resolution and stratigraphic sensitivity of detrital zircon in ascertaining provenance, and we demonstrate its ability to detect source changes for...
Neogene transpressional foreland basin development on the north side of the central alaska range, usibelli group and nenana gravel, tanana basin
K.D. Ridgway, E.E. Thoms, P.W. Layer, M.E. Lesh, J. M. White, S. V. Smith
2007, Special Paper of the Geological Society of America 507-547
Neogene strata of the Tanana basin provide a long-term record of a northwardpropagating, transpressional foreland-basin system related to regional shortening of the central Alaska Range and strike-slip displacement on the Denali fault system. These strata are ???2 km thick and have been deformed and exhumed in thrust faults that form...
Glacier mass-balance fluctuations in the Pacific Northwest and Alaska, USA
E.G. Josberger, W. R. Bidlake, R.S. March, B.W. Kennedy
2007, Conference Paper, Annals of Glaciology
The more than 40 year record of net and seasonal mass-balance records from measurements made by the United States Geological Survey on South Cascade Glacier, Washington, and Wolverine and Gulkana Glaciers, Alaska, shows annual and interannual fluctuations that reflect changes in the controlling climatic conditions at regional and global scales....
Pre-, syn-, and postcollisional stratigraphic framework and provenance of upper triassic-upper cretaceous strata in the northwestern talkeetna mountains, alaska
B. A. Hampton, K.D. Ridgway, J.M. O’Neill, G. E. Gehrels, J. Schmidt, R. B. Blodgett
2007, Special Paper of the Geological Society of America 401-438
Mesozoic strata of the northwestern Talkeetna Mountains are located in a regional suture zone between the allochthonous Wrangellia composite terrane and the former Mesozoic continental margin of North America (i.e., the Yukon-Tanana terrane). New geologic mapping, measured stratigraphic sections, and provenance data define a distinct three-part stratigraphy for these strata....
WSR-88D observations of volcanic ash
J. Wood, C. Scott, D. Schneider
2007, Conference Paper, 87th AMS Annual Meeting
Conclusions that may impact operations are summarized below: ??? Current VCPs may not be optimal for the scharacterization of volcanic events. Therefore, the development of a new VCP that combines the enhanced low level elevation density and increased temporal resolution of VCP 12 with the enhanced sensitivity of VCP 31....
Early Tertiary transtension-related deformation and magmatism along the Tintina fault system, Alaska
A.B. Till, S. M. Roeske, D. C. Bradley, R. Friedman, P.W. Layer
2007, Special Paper of the Geological Society of America (434) 233-264
Transtensional deformation was concentrated in a zone adjacent to the Tintina strike-slip fault system in Alaska during the early Tertiary. The deformation occurred along the Victoria Creek fault, the trace of the Tintina system that connects it with the Kaltag fault; together the Tintina and Kaltag fault systems girdle Alaska...
The geophysical character of southern Alaska - Implications for crustal evolution
R. W. Saltus, T. L. Hudson, Frederic H. Wilson
2007, Special Paper of the Geological Society of America (431) 1-20
The southern Alaska continental margin has undergone a long and complicated history of plate convergence, subduction, accretion, and margin-parallel displacements. The crustal character of this continental margin is discernible through combined analysis of aeromagnetic and gravity data with key constraints from previous seismic interpretation. Regional magnetic data are particularly useful...
Detrital zircon geochronology of some neoproterozoic to triassic rocks in interior Alaska
D. C. Bradley, W.C. McClelland, J. L. Wooden, A.B. Till, S. M. Roeske, Marti L. Miller, Susan M. Karl, J.G. Abbott
2007, Special Paper of the Geological Society of America 155-189
No abstract available. ...
Adjusting for telemetry bias in behavior data
Mark S. Udevitz, Chadwick V. Jay, Anthony S. Fischbach, Joel L. Garlich-Miller
2007, Conference Paper, Proceedings of the Annual Meeting of the Alaska Chapter of the American Statistical Association
No abstract available. ...
Dietary and spatial overlap between sympatric ursids relative to salmon use
Jennifer K. Fortin, Sean D. Farley, Karyn D. Rode, Charles T. Robbins
2007, Ursus (18) 19-29
We hypothesized that there would be minimal dietary overlap between sympatric brown bears (Ursus arctos) and American black bears (U. americanus) relative to salmon (Oncorhynchus spp.) utilization when alternative foods (e.g., fruits) are abundant. To maximize the chance that we would reject this hypothesis, we examined the diets of brown and black...
Regional magnetic anomalies, crustal strength, and the location of the northern Cordilleran fold-and-thrust belt
R. W. Saltus, T. L. Hudson
2007, Geology (35) 567-570
The northern Cordilleran fold-and-thrust belt in Canada and Alaska is at the boundary between the broad continental margin mobile belt and the stable North American craton. The fold-and-thrust belt is marked by several significant changes in geometry: cratonward extensions in the central Yukon Territory and northeastern Alaska are separated by...
Young cumulate complex beneath Veniaminof caldera, Aleutian arc, dated by zircon in erupted plutonic blocks
C. R. Bacon, T.W. Sison, F.K. Mazdab
2007, Geology (35) 491-494
Mount Veniaminof volcano, Alaska Peninsula, provides an opportunity to relate Quaternary volcanic rocks to a coeval intrusive complex. Veniaminof erupted tholeiitic basalt through dacite in the past ∼260 k.y. Gabbro, diorite, and miarolitic granodiorite blocks, ejected 3700 14C yr B.P. in the most recent...
Postseismic relaxation and aftershocks
J.C. Savage, J. L. Svarc, S.-B. Yu
2007, Journal of Geophysical Research B: Solid Earth (112)
[1] Perfettini et al. (2005) suggested that the temporal dependence of surface displacements u(t) measured in the epicentral area following an earthquake is related to N(t), the cumulative number of aftershocks, by the equation u(t) = a + bt + cN(t) + d(1 − e−αt), where a, b, c, d, and α are constants chosen to fit the data and t is the postearthquake...
An evaluation of petrogenic hydrocarbons in northern Gulf of Alaska continental shelf sediments - The role of coastal oil seep inputs
J.W. Short, J.J. Kolak, J. R. Payne, G. K. Van Kooten
2007, Organic Geochemistry (38) 643-670
We compared hydrocarbons in water, suspended particulate matter (SPM), and riparian sediment collected from coastal watersheds along the Yakataga foreland with corresponding hydrocarbons in Gulf of Alaska benthic sediments. This comparison allows an evaluation of hydrocarbon contributions to marine sediments from natural oil seeps, coal and organic matter (e.g., kerogen)...
Proximate composition, energetic value, and relative abundance of prey fish from the inshore eastern Bering Sea: Implications for piscivorous predators
J.R. Ball, Daniel Esler, Joel A. Schmutz
2007, Polar Biology (30) 699-708
Changing ocean conditions and subsequent shifts in forage fish communities have been linked to numerical declines of some piscivorous marine birds and mammals in the North Pacific. However, limited information about fish communities is available for some regions, including nearshore waters of the eastern Bering Sea, where many piscivores reside....
Mass dynamics of wintering Pacific Black Brant: Body, adipose tissue, organ, and muscle masses vary with location
D.D. Mason, P.S. Barboza, David H. Ward
2007, Canadian Journal of Zoology (85) 728-736
We compared body size and mass of the whole body, organs, adipose tissue, and muscles of adult Pacific Black Brant (Branta bernicla nigricans (Lawrence, 1846)) collected concurrently in Alaska and Baja California during the fall, winter, and spring of 2002–2003. Head and tarsal lengths of males were similar between sites...
Recovery of three arctic stream reaches from experimental nutrient enrichment
J.P. Benstead, A.C. Green, Linda A. Deegan, B. J. Peterson, K. Slavik, W.B. Bowden, A.E. Hershey
2007, Freshwater Biology (52) 1077-1089
1. Nutrient enrichment and resulting eutrophication is a widespread anthropogenic influence on freshwater ecosystems, but recovery from nutrient enrichment is poorly understood, especially in stream environments. We examined multi-year patterns in community recovery from experimental low-concentration nutrient enrichment (N + P or P only) in three reaches of two Arctic...
Intertidal sand body migration along a megatidal coast, Kachemak Bay, Alaska
P.N. Adams, P. Ruggiero, G.C. Schoch, G. Gelfenbaum
2007, Journal of Geophysical Research F: Earth Surface (112)
[1] Using a digital video-based Argus Beach Monitoring System (ABMS) on the north shore of Kachemak Bay in south central Alaska, we document the timing and magnitude of alongshore migration of intertidal sand bed forms over a cobble substrate during a 22-month observation period. Two...
Glacier changes in southeast Alaska and northwest British Columbia and contribution to sea level rise
C.F. Larsen, R.J. Motyka, A.A. Arendt, K.A. Echelmeyer, P.E. Geissler
2007, Journal of Geophysical Research F: Earth Surface (112)
The digital elevation model (DEM) from the 2000 Shuttle Radar Topography Mission (SRTM) was differenced from a composite DEM based on air photos dating from 1948 to 1987 to detennine glacier volume changes in southeast Alaska and adjoining Canada. SRTM accuracy was assessed at ??5 in through comparison with airborne...
Variation in winter diet of southern Beaufort Sea polar bears inferred from stable isotope analysis
T.W. Bentzen, Erich H. Follmann, Steven C. Amstrup, G.S. York, M. J. Wooller, T. M. O'Hara
2007, Canadian Journal of Zoology (85) 596-608
Ringed seals (Phoca hispida Schreber, 1775 = Pusa hispida (Schreber, 1775)) and bearded seals (Erignathus barbatus (Erxleben, 1777)) represent the majority of the polar bear (Ursus maritimus Phipps, 1774) annual diet. However, remains of lower trophic level bowhead whales (Balaena mysticetus L., 1758) are available in the southern Beaufort Sea and their dietary contribution to polar...
Coupling contaminants with demography: Effects of lead and selenium in Pacific common eiders
H.M. Wilson, Paul L. Flint, A.N. Powell
2007, Environmental Toxicology and Chemistry (26) 1410-1417
We coupled intensive population monitoring with collection of blood samples from 383 nesting Pacific common eiders (Somateria mollisima v-nigrum) at two locations in Alaska (USA) from 2002 to 2004. We investigated annual, geographic, and within-season variation in blood concentrations of lead and selenium; compared exposure patterns with sympatrically nesting spectacled...
Using a bioenergetic model to assess growth reduction from catch-and-release fishing and hooking injury in rainbow trout, Oncorhynchus mykiss
Julie M. Meka, F.J. Margraf
2007, Fisheries Management and Ecology (14) 131-139
A bioenergetic model was used to predict the potential effects of feeding cessation caused by catch-and-release capture and a reduction in feeding efficiency from hooking injuries on rainbow trout, Oncorhynchus mykiss (Walbaum), growth in southwest Alaska, USA. Simulations indicated that a 1-day feeding cessation for a rainbow trout captured one to two...
Flyway-scale variation in plasma triglyceride levels as an index of refueling rate in spring-migrating western sandpipers (Calidris mauri)
T.D. Williams, N. Warnock, John Y. Takekawa, M.A. Bishop
2007, The Auk (124) 886-897
We combined radiotelemetry, plasma metabolite analyses, and macro-invertebrate prey sampling to investigate variation in putative fattening rates (estimated as plasma triglyceride levels) at the flyway scale in Western Sandpipers (Calidris mauri) migrating between Punta Banda, Mexico (31°N), and Hartney Bay, Alaska (60°N), a distance of 4,240 km. Birds were caught...
