The adaptive significance of hatching synchrony of waterfowl eggs
Paul L. Flint, Mark S. Lindberg, Margaret C. MacCluskie, James S. Sedinger
1994, Wildfowl (45) 248-254
We estimated the amount of incubation time that first laid Black Brent eggs received before completion of the clutch. First laid eggs received up to 48 hours of incubation before the last egg was laid in Brent clutches. Waterfowl clutches usually hatch within a period of 24 hours, suggesting that...
Identification of tundra land cover near Teschekpuk Lake, Alaska using SPOT satellite data
Carl J. Markon, Dirk V. Derksen
1994, Arctic (47) 222-231
Tundra vegetation in the Teshekpuk Lake area of the Alaskan Arctic Coastal Plain was mapped to assess distribution and abundance of waterfowl habitats. Three SPOT satellite scenes were acquired and registered to a 20 m Universal Transverse Mercator grid. Two clustering techniques were used to develop statistical parameters by...
Postbreeding dispersal and drift-net mortality of endangered Japanese Murrelets
John F. Piatt, Patrick J. Gould
1994, The Auk (111) 953-961
The incidental catch of seabirds in high-seas drift nets was recorded in 1990-1991 by scientific observers on commercial squid and large-mesh fishery vessels operating in the North Pacific Transitional Zone. Twenty-six Synthliboramphus murrelet deaths were recorded in the months of August through December. All but one were from the Korean...
Reproductive ecology of tundra swans on the Arctic National Wildlife Refuge, Alaska
Matthew J. Monda, John T. Ratti, Thomas R. McCabe
1994, Journal of Wildlife Management (58) 757-773
Management of tundra swans (Cygnus columbianus) is hampered by a lack of information on their nesting and brood-rearing ecology. We studied tundra swan nesting and brood-rearing ecology on the Arctic National Wildlife Refuge (ANWR), Alaska, 1988-90. Nest success was 58% (n = 31) in 1988, 83% (n = 36) in...
White sturgeon spawning and rearing habitat in the lower Columbia River
Michael J. Parsley, Lance G. Beckman
1994, North American Journal of Fisheries Management (14) 812-827
Estimates of spawning habitat for white sturgeons Acipenser transmontanus in the tailraces of the four dams on the lower 470 km of the Columbia River were obtained by using the Physical Habitat Simulation System of the U.S. Fish and Wildlife Service's Instream Flow Incremental Methodology to identify areas with suitable...
Using stable isotopes to determine seabird trophic relationships
Keith A. Hobson, John F. Piatt, Jay Pitocchelli
1994, Journal of Animal Ecology (63) 786-798
1. The stable isotopes of nitrogen (δ15N) and carbon (δ13C) were analysed in 22 species of marine birds from coastal waters of the northeast Pacific Ocean. Analyses confirm that stable nitrogen isotopes can predict seabird trophic positions.2. Based on δ15N analyses, seabird trophic-level inferences generally agree with those of conventional...
The role of magmas in the formation of hydrothermal ore deposits
Jeffrey W. Hedenquist, Jacob B. Lowenstern
1994, Nature (370) 519-527
Magmatic fluids, both vapour and hypersaline liquid, are a primary source of many components in hydrothermal ore deposits formed in volcanic arcs. These components, including metals and their ligands, become concentrated in magmas in various ways from various sources, including subducted oceanic crust. Leaching of rocks also contributes components...
Analysis of ground-water flow in the "1,200-foot" aquifer, Baton Rouge area
K. J. Halford, J. K. Lovelace
1994, Report
No abstract available ...
Comparison of age determination techniques for female northern pintails and American wigeon in spring
Daniel Esler, J. Barry Grand
1994, Wildlife Society Bulletin (22) 260-264
Accurate age-class determination of waterfowl is necessary for studies addressing age-specific effects (e.g., Serie et al., 1992) and age structure of populations (e.g., Raveling and Heitmeyer 1989). Duck ages can be determined in fall by morphological and color characteristics of tertial and tail feathers (Carney 1992); however, these feathers are...
Use of boreal forested wetlands by Pacific loons (Gavia pacifica Lawrence) and horned grebes (Podiceps auritus L.): Relations with limnological characteristics
P.J. Heglund, J.R. Jones, L.H. Fredrickson, M.S. Kaiser
1994, Book chapter, Developments in Hydrobiology: Aquatic birds in the trophic web of lakes: Proceedings of a symposium held in Sackville, New Brunswick, Canada, in August 1991
Our objective was to determine if the occurrence and abundance of Pacific loons (Gavia pacifica Lawrence) and horned grebes (Podiceps auritus L.) on 123 wetlands of Yukon Flats National Wildlife Refuge in east central Alaska were related to the limnological characteristics of those wetlands. Aquatic bird-wetland...
Environmental variability facilitates coexistence within an alcid community at sea
J. Christopher Haney, Amy E.S. Schauer
1994, Marine Ecology Progress Series (103) 221-237
We examined coexistence at sea among 7 taxa of diving, wing-propelled seabirds (Alcidae) in the genera Aethia, Uria, Cepphus, and Fratercula. Species abundances were measured simultaneously with a suite of environmental factors in the northern Bering Sea, Alaska, USA; data from 260 adjacent and non-adjacent sites occupied by alcids foraging...
Conservation of North Pacific shorebirds
Robert E. Gill Jr., Robert W. Butler, Pavel S. Tomkovich, Taej Mundkur, Colleen M. Handel
1994, Conference Paper
In his introduction to the 1979 Symposium proceedings entitled “Shorebirds in Marine Environments," Frank Pitelka stressed the need for studies and conservation programs that spanned the western hemisphere (Pitelka 1979). In the 15 years since Pitelka's call to arms, the locations of many important migratory and wintering sites for shorebirds...
Involvement of rainbow trout leucocytes in the pathogenesis of infectious hematopoietic necrosis
S. Chilmonczyk, J. R. Winton
1994, Diseases of Aquatic Organisms 89-94
Rainbow trout Oncorhynchus myluss leucocytes were tested for their ability to support replication of infectious hematopoietic necrosis virus (IHNV). Viral replication occurred in vitro uslng leucocytes cultured from peripheral blood, kidney, and thymus where viral titers peaked at 2 to 4 d post-inoculation. Leucocytes collected from trout following waterborne challenge...
Succession on regraded placer mine spoil in Alaska, USA, in relation to initial site characteristics
R.V. Densmore
1994, Arctic and Alpine Research (26) 354-363
This study evaluated the rate and pattern of natural succession on regraded placer mine spoil in relation to initial substrate characteristics. The study site was the Glen Creek watershed of the Kantishna mining area of Denali National Park and Preserve, Alaska. After regrading, twelve 0.01-ha plots were established and...
Local energy flux estimates for unstable conditions using variance data in semiarid rangelands
William P. Kustas, J.H. Blanford, D.I. Stannard, C.S.T. Daughtry, W. D. Nichols, M.A. Weltz
1994, Water Resources Research (30) 1351-1361
A network of meteorological stations was installed during the Monsoon '90 field campaign in the Walnut Gulch experimental watershed. The study area has a fairly complex surface. The vegetation cover is heterogeneous and sparse, and the terrain is mildly hilly, but dissected by ephemeral channels. Besides measurement of some of...
Assessment of shoreline vegetation in relation to use by molting black brant Branta bernicla nigricans on the Alaska Coastal Plain
Milton W. Weller, K. C. Jensen, Eric J. Taylor, Mark W. Miller, Karen S. Bollinger, Dirk V. Derksen, Daniel Esler, Carl J. Markon
1994, Biological Conservation (70) 219-225
To evaluate the importance of large thaw lakes on the Alaska Coastal Plain for molting Pacific black brant Branta bernicla nigricans, distribution and life form of shoreline vegetation were assessed using several scales: satellite imagery, point-intercept transects, cover quadrats, and a parameter for water regime. Brant population and distribution estimates...
Response of staging brant to disturbance at Izembek Lagoon, Alaska
David H. Ward, Robert A. Stehn, Dirk V. Derksen
1994, Wildlife Society Bulletin (22) 220-228
Human disturbance of migrating waterfowl concerns managers of wildlife populations and refuges. Human disturbance may reduce food intake through interruption of foraging bouts or by displacement from feeding areas (Madsen 1985, Belanger and Bedard 1989), and it may increase energy expenditure from additional time in flight (Korschgen et al., 1985)....
Molecular weight, polydispersity, and spectroscopic properties of aquatic humic substances
Y.-P. Chin, G. Aiken, Edward J. O’Loughlin
1994, Environmental Science & Technology (28) 1853-1858
The number- and weight-averaged molecular weights of a number of aquatic fulvic acids, a commercial humic acid, and unfractionated organic matter from four natural water samples were measured by high-pressure size exclusion chromatography (HPSEC). Molecular weights determined in this manner compared favorably with those values reported in the literature. Both...
Background concentration of (super 129) I in ground and surface water, eastern Snake River Plain, Idaho, 1992
Larry J. Mann, T.M. Beasley
1994, Journal of the Idaho Academy of Science (30) 75-87
No abstract available....
Spatial and temporal statistical analysis of a ground-water level network, Broward County, Florida
E.D. Swain, R.S. Sonenshein
1994, Water-Resources Investigations Report 94-4076
The U.S. Geological Survey has developed a method to evaluate the spatial and temporal statistics of a continuous ground-water level recorder network in Broward County, Florida. Because the Broward County network is sparse for most spatial statistics, a technique has been developed to define polygons for each well that represent...
Hydrogeology and simulation of ground-water flow near the Lantana Landfill, Palm Beach County, Florida
G.M. Russell, E. J. Wexler
1993, Water-Resources Investigations Report 92-4107
The Lantana landfill in Palm Beach County has a surface that is 40 to 50 feet above original ground level and consists of about 250 acres of compacted garbage and trash. Parts of the landfill are below the water table. Surface-resistivity measurements and water-quality analyses indicate that leachate-enriched ground water...
Water resources data Maryland and Delaware, water year 1993, Volume 2: Ground-water data
M.J. Smigaj, R.W. Saffer, J.L. Tegeler
1993, Water Data Report MD-DE-93-2
No abstract available....
Water resources data Maryland and Delaware, water year 1993, Volume 1. Surface-water data
R.W. James, R.H. Simmons, B.F. Strain
1993, Water Data Report MD-DE-93-1
No abstract available....
Ground-water conditions in Utah, spring of 1993
D.M. Batty, D.V. Allen, J.D. Sory, K.M. Hanson, W.J. Thomas, M.R. Greene, M.R. Danner, L. R. Herbert, H.K. Hadley, S.J. Gerner, B.A. Slaugh, R.L. Swenson, J.H. Howells, H.K. Christiansen
1993, Cooperative Investigations Report 33
This is the thirtieth in a series of annual reports that describe ground-water conditions in Utah. Reports in this series, published cooperatively by the U.S. Geological Survey and the Utah Division of Water Resources, provide data to enable interested parties to keep abreast of changing ground-water conditions.This report, like the...
Investigations of acid depositions
Owen P. Bricker, Karen C. Rice
1993, Report
No abstract available....
