Maps showing areas of potential for mineral resources in the Cordova and northern Middleton Island 1 degree by 3 degrees quadrangles, southern Alaska
R.J. Goldfarb, J. E. Case, George Plafker, G. R. Winkler
1992, Miscellaneous Field Studies Map 2190
Deep-water facies of the Lisburne Group, west-central Brooks Range, Alaska
Julie A. Dumoulin, Anita G. Harris, Jeanine M. Schmidt
Dennis K. Thurston, Kazuya Fujita, editor(s)
1992, Conference Paper, Proceedings: 1992 international conference on Arctic margins (MMS 94-0040)
Deep-water lithofacies of the Lisburne Group (chiefly Carboniferous) occur in thurst sheets in the western part of the foreland fold-and-thrust belt of the Brooks Range and represent at least three discrete units. The Kuna Formation (Brooks Range allochthon) consists mostly of spiculitic mudstone and lesser shale; subordinate carbonate layers are...
Correlation of pre-Carboniferous carbonate successions of northern Alaska
Julie A. Dumoulin, Anita G. Harris
Dennis K. Thurston, Kazuya Fujita, editor(s)
1992, Conference Paper, Proceedings: 1992 international conference on Arctic margins (MMS 94-0040)
Fault-bounded successions of pre-Carboniferous (meta)carbonate rocks occur throughout northern Alaska. Successions studied in detail are those in the York Mountains (Seward Peninsula), the western and eastern Baird Mountains (western Brooks Range), the Snowden Mountain area (central Brooks Range), and the Sublik and Sadlerochit Mountains (eastern Brooks range); they are correlated...
Annual survival rates of adult and immature eastern population tundra swans
James D. Nichols, J. Bart, Roland J. Limpert, William J.L. Sladen, James E. Hines
1992, Journal of Wildlife Management (56) 485-494
Tundra swans (Cygnus columbianus) of the eastern population were neckbanded in Maryland, North Carolina, and Alaska from 1966 through 1990. These swans were resighted and recaptured during autumn, winter, and spring, 1966-1990. Although the original motivation for this study involved swan movements, we wanted to use the resulting data to...
Identification of viral hemorrhagic septicemia virus isolated from Pacific cod Gadus macrocephalus in Prince William Sound Alaska, USA
T.R. Meyers, J. Sullivan, E. Emmenegger, J. Follett, S. Short, W.N. Batts, J. R. Winton
1992, Diseases of Aquatic Organisms (12) 167-175
Ulcerative slun tissues from 2 Pacific cod Gadus rnacrocephalus caught in Prince William Sound, Alaska, USA, were examined for virus by Fish Pathology staff within the F.R.E.D. Division of the Alaska Department of Fish and Game. Six days after inoculation of Epitheliorna papulosum cyprini (EPC) cells at 14"C, diffuse rounding...
A mid-Permian chert event: Widespread deposition of biogenic siliceous sediments in coastal, island arc and oceanic basins
B.L. Murchey, D. L. Jones
1992, Palaeogeography, Palaeoclimatology, Palaeoecology (96) 161-174
Radiolarian and conodont of Permian siliceous rocks from twenty-three areas in teh the circum-Pacific and Mediterranean regions reveal a widespread Permian Chert Event during the middle Leonardian to Wordian. Radiolarian- and (or) sponge spicule-rich siliceous sediments accumulated beneath high productivity zones in coastal, island arc and oceanic basins. Most of...
Application of continuum models to deformation of the Aleutian Island Arc
Eric L. Geist, David W. Scholl
1992, Journal of Geophysical Research Solid Earth (97) 4953-4967
Continuum models were constructed to describe large‐scale deformation of the Aleutian Island Arc over the past 5 m.y. These models consider the island arc as a continuum in the horizontal plane with the velocity boundary condition at the Pacific edge stated as a fraction of Pacific plate convergence transferred to...
Thin, low‐velocity crust beneath the southern Yukon‐Tanana Terrane, east central Alaska: Results from Trans‐Alaska crustal transect refraction/wide‐angle reflection data
Bruce C. Beaudoin, Gary S. Fuis, Walter D. Mooney, Warren J. Nokleberg, Nikolas I. Christensen
1992, Journal of Geophysical Research B: Solid Earth (97) 1921-1942
A seismic refraction/wide‐angle reflection survey for the Trans‐Alaska Crustal Transect program reveals a thin, reflective crust beneath the southern Yukon‐Tanana terrane (YTT) in east central Alaska. These data are the first detailed refraction survey of the southern YTT and compose a 130‐km‐long reversed profile along the Alaska...
Evidence for cenozoic crustal extension in the Bering Sea region
Alan K. Cooper, M. S. Marlow, D.W. Scholl, A.J. Stevenson
1992, Tectonics (11) 719-731
Geophysical and regional geologic data provide evidence that parts of the oceanic crust in the abyssal basins of the Bering Sea have been created or altered by crustal extension and back‐arc spreading. These processes have occurred during and since early Eocene time when the Aleutian Ridge developed and isolated oceanic...
Geographic Variation in Hirundo pyrrhonota (Cliff Swallow) from Northern North America
M. Ralph Browning
1992, Western Birds (23) 21-29
The number of subspecies recognized in Hirundo pyrrhonota Vieillot (Cliff Swallow) from Alaska, Canada, and the northern contiguous United States ranges from one (Peters 1960) to three (e.g., Jewett et al. 1953, Oberholser, 1920, breeding from central Alaska to the central Great Basin, and two disjunct populations of nominate pyrrhonota,...
Earthquakes, September - October 1992
W. J. Person
1992, Earthquakes & Volcanoes (USGS) (23) 280-287
This reporting period was very active in terms of earthquake occurrence; there were six major earthquakes (7.0≤M<8.0) during the second half of october. Earthquake-related deaths were reported in Iran, Nicaragua, Egypt, Colombia, Morocco, Zaire, and the Republic of Georgia. In the United States, a damaging earthquake occurred in Utah on Septmber...
Earthquakes, May-June 1991
W. J. Person
1992, Earthquakes & Volcanoes (USGS) (23) 77-81
One major earthquake occurred during this reporting period. This was a magntidue 7.1 in Indonesia (Minahassa Peninsula) on June 20. Earthquake-related deaths were reported in the Western Caucasus (Georgia, USSR) on May 3 and June 15. One earthquake-related death was also reported El Salvador on June 21. In the United States,...
Breeding chronology of mottled ducks in a Texas coastal marsh
J. Barry Grand
1992, Journal of Field Ornithology (63) 195-202
The relationship between breeding chronology of Mottled Ducks (Anas fulvigula fulvigula) and wetland conditions at San Bernard National Wildlife Refuge was examined over a 3-yr period. Median nest initiation dates varied by as much as 68 d among years. Initiation occurred earlier in 1985 and 1987 versus 1986 (P <...
Intraspecific variation in egg shape among individual emperor geese
Margaret R. Petersen
1992, Journal of Field Ornithology (63) 344-354
Within-clutch variability in shape of 1743 eggs from 301 nests of Emperor Geese (Chen canagicus) laid over a 5-yr period was measured. Individual females laid similar shaped eggs in successive years, and eggs among clutches within females could not be distinguished. Cluster analysis correctly identified 69.9% of 136 known conspecific...
Roosting behavior of premigratory Dunlins (Calidris alpina)
Colleen M. Handel, Robert E. Gill Jr.
1992, The Auk (109) 57-72
We studied roosting behavior of Dunlins (Calidris alpina) during late summer along the coast of the Yukon-Kuskokwim Delta, Alaska, in relation to tidal cycle, time of day, time of season, and occurrence of predators. Within Angyoyaravak Bay, peak populations of 70,000-100,000 Dunlins occur each year. The major diurnal roost sites...
Paleomagnetism and geochronology of 23 Ma gabbroic intrusions in the Keku Strait, Alaska, and implications for the Alexander Terrane
Peter J. Haeussler, Robert S. Coe, Paul R. Renne
1992, Journal of Geophysical Research B: Solid Earth (97) 19641-19649
Samples of Tertiary gabbro from 24 sites in the Keku Strait, Alaska, help constrain the displacement history of the Alexander terrane. Step heating experiments on a plagioclase separate from these previously undated intrusions indicate a discordant 40Ar/39Ar age of 23.1 ± 1.7 Ma. The characteristic magnetization resides in magnetite, is...
Reproductive implications of egg-size variation in Black Brant
Paul L. Flint, James S. Sedinger
1992, The Auk (109) 896-903
We analyzed variation in egg size of Black Brant (Branta bernicla nigricans) in relation to clutch size, laying date, female age, year, and position in the laying sequence. A total of 3,478 eggs was measured over three years. Egg size increased with clutch size and female age, and decreased with...
Suppression of guinea pig ileum induced contractility by plasma albumin of hibernators
David S. Bruce, Douglas L. Ambler, Timothy M. Henschel, Peter R. Oeltgen, Sita P. Nilekani, Steven C. Amstrup
1992, Pharmacology Biochemistry and Behavior (43) 199-203
Previous studies suggest that hibernation may be regulated by internal opioids and that the putative “hibernation induction trigger” (HIT) may itself be an opioid. This study examined the effect of plasma albumin (known to bind HIT) on induced contractility of the guinea pig ileum muscle strip. Morphine (400 nM) depressed...
Density of loons in central Alaska
Richard B. Lanctot, Pham Xuan Quang
1992, The Condor (94) 282-286
Loons breed across North America from the high arctic south to about 43 north latitude. (AOU 1983). Populations, particularly of Common Loons (Gavia immer) have recently declined in the continental U.S. and southern Canada (Sutcliff 1979, Titus and VanDruff 1981, McIntyre 1988). As a result, state and private natural resource...
Reproductive ecology of Emperor Geese: Survival of adult females
Margaret R. Petersen
1992, The Condor (94) 398-406
Life history theory predicts a decrease in survival with increased reproductive effort of individuals. This relationship, however, is highly variable among and within species. I studied the nesting success and survival of adult female Emperor Geese during 1982-1986 and found no direct evidence that differential reproductive effort as measured by...
Distribution, numbers, and habitat of Bristle-thighed Curlews (Numinous tahitiensis) on Rangiroa atoll
Robert E. Gill Jr., Roland L. Redmond
1992, Notornis (39) 17-26
We assessed the numbers, distribution, and habitat of Bristle-tithed Curlews (Numinous tahitiensis) on Rangiroa Atoll, Tuamotu Archipelago, during a visit in April 1988. We estimated a total of 250-350 curlews on the atoll. These birds were seen only on the southern and western rims, where they were most common on...
Time allocation by Greater White-fronted Geese: Influence of diet, energy reserves and predation
Craig R. Ely
1992, The Condor (94) 857-870
I determined the amount of time Greater White-fronted Geese (Anser albifrons frontalis) allocated to various activities from September to May, 1980-1982 at their primary wintering areas in the Pacific Flyway of North America. The length of time spent on roosts during the day was positively correlated to day length. Geese...
Changes in Alaskan soft-bottom prey communities along a gradient in sea otter predation
R.G. Kvitek, J.S. Oliver, A.R. DeGange, B.S. Anderson
1992, Ecology (73) 413-428
Sea Otter (Enhydra lutris), well documented as "keystone" predators in rocky marine communities, were found to exert a strong influence on infaunal prey communities in soft-sediment habitats. Direct and indirect effects of sea otter predation on subtidal soft-bottom prey communities were evaluated along a temporal gradient of sea otter occupancy...
Threshold foraging behavior of baleen whales
John F. Piatt, David A. Methven
1992, Marine Ecology Progress Series (84) 210
We conducted hydroacoustic surveys for capelin Mallotus villosus in Witless Bay, Newfoundland, Canada, on 61 days during the summers of 1983 to 1985. On 32 of those days in whlch capelin surveys were conducted, we observed a total of 129 baleen whales - Including 93 humpback Megaptera novaeangliae, 31 minke...
Paleomagnetism of the Late Triassic Hound Island Volcanics: Revisited
Peter J. Haeussler, Robert S. Coe, T.C. Onstott
1992, Journal of Geophysical Research B: Solid Earth (97) 19617-19639
The collision and accretion of the Alexander terrane profoundly influenced the geologic history of Alaska and western Canada; however, the terrane's displacement history is only poorly constrained by sparse paleomagnetic studies. We studied the paleomagnetism of the Hound Island Volcanics in order to evaluate the location of the Alexander terrane...