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,...
Stratigraphy and palaeoclimatic significance of Late Quaternary loess-palaeosol sequences of the Last Interglacial-Glacial cycle in central Alaska
D.R. Muhs, T. A. Ager, E. Arthur Bettis III, J. McGeehin, J.M. Been, J. E. Beget, M.J. Pavich, Thomas W. Stafford Jr., D.A.S.P. Stevens
2003, Quaternary Science Reviews (22) 1947-1986
Loess is one of the most widespread subaerial deposits in Alaska and adjacent Yukon Territory and may have a history that goes back 3 Ma. Based on mineralogy and major and trace element chemistry, central Alaskan loess has a composition that is distinctive from other loess bodies of the world,...
Individual variation in space use by female spotted hyenas
Erin E. Boydston, Karen M. Kapheim, Micaela Szykman, Kay E. Holekamp
2003, Journal of Mammalogy (84) 1006-1018
Large carnivores range more widely than many other terrestrial mammals, and this behavior tends to bring them into frequent conflict with humans. Within any carnivore population, individual variation in patterns of space use should be expected to make some animals more vulnerable than others to risks of mortality from humans...
Altered behavior in spotted hyenas associated with increased human activity
Erin E. Boydston, Karen M. Kapheim, Heather E. Watts, Micaela Szykman, Kay E. Holekamp
2003, Animal Conservation (6) 207-219
To investigate how anthropogenic activity might affect large carnivores, we studied the behaviour of spotted hyenas (Crocuta crocuta) during two time periods. From 1996 to 1998, we documented the ecological correlates of space utilization patterns exhibited by adult female hyenas defending a territory at the edge of a wildlife reserve...
Treatment of black-tailed prairie dog burrows with deltamethrin to control fleas (Insecta: Siphonaptera) and plague
D.B. Seery, E. Biggins, J.A. Montenieri, R.E. Enscore, D.T. Tanda, K.L. Gage
2003, Journal of Medical Entomology (40) 718-722
Burrows within black-tailed prairie dog (Cynomys ludovicianus) colonies on the Rocky Mountain Arsenal National Wildlife Refuge, Colorado, were dusted with deltamethrin insecticide to reduce flea (Insecta: Siphonaptera) abundance. Flea populations were monitored pre- and posttreatment by combing prairie dogs and collecting fleas from burrows. A single application of deltamethrin significantly...
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...
Power-law tail probabilities of drainage areas in river basins
S.A. Veitzer, B.M. Troutman, V.K. Gupta
2003, Physical Review E - Statistical, Nonlinear, and Soft Matter Physics (68) 161231-161239
The significance of power-law tail probabilities of drainage areas in river basins was discussed. The convergence to a power law was not observed for all underlying distributions, but for a large class of statistical distributions with specific limiting properties. The article also discussed about the scaling properties of topologic and...
The use of multi-temporal Landsat Normalized Difference Vegetation Index (NDVI) data for mapping fuels in Yosemite National Park, USA
Jan W. Van Wagtendonk, Ralph R. Root
2003, International Journal of Remote Sensing (24) 1639-1651
The objective of this study was to test the applicability of using Normalized Difference Vegetation Index (NDVI) values derived from a temporal sequence of six Landsat Thematic Mapper (TM) scenes to map fuel models for Yosemite National Park, USA. An unsupervised classification algorithm was used to define 30 unique spectral-temporal...
Carbon cycling in extratropical terrestrial ecosystems of the Northern Hemisphere during the 20th century: a modeling analysis of the influences of soil thermal dynamics
Q. Zhuang, A. D. McGuire, J. M. Melillo, Joy S. Clein, R.J. Dargaville, D. W. Kicklighter, Ranga B. Myneni, J. Dong, V.E. Romanovsky, J. Harden, J.E. Hobbie
2003, Tellus, Series B: Chemical and Physical Meteorology (55) 751-776
There is substantial evidence that soil thermal dynamics are changing in terrestrial ecosystems of the Northern Hemisphere and that these dynamics have implications for the exchange of carbon between terrestrial ecosystems and the atmosphere. To date, large-scale biogeochemical models have been slow to incorporate the effects of soil thermal dynamics...
Planning for population viability on Northern Great Plains national grasslands
F. B. Samson, F.L. Knopf, C.W. McCarthy, B.R. Noon, W.R. Ostlie, S.M. Rinehart, S. Larson, G. E. Plumb, G.L. Schenbeck, D.N. Svingen, T.W. Byer
2003, Wildlife Society Bulletin (31) 986-999
Broad-scale information in concert with conservation of individual species must be used to develop conservation priorities and a more integrated ecosystem protection strategy. In 1999 the United States Forest Service initiated an approach for the 1.2× 106 ha of national grasslands in the Northern Great Plains to fulfill the requirement...
The diet of Chesapeake Bay striped bass in the late 1950s
J.C. Griffin, F.J. Margraf
2003, Fisheries Management and Ecology (10) 323-328
The diet of Chesapeake Bay striped bass, (Morone saxatilis) Walbaum, based on unpublished stomach content data from 916 fish collected between 1955 and 1959 was described. The diet in the late 1950s, quantified using an index of relative importance (IRI), was dominated by Atlantic menhaden, Brevoortia tyrannus Latrobe. Atlantic menhaden...
The sedimentary record of climatic and anthropogenic influence on the Patuxent estuary and Chesapeake Bay ecosystems
T. M. Cronin, C.D. Vann
2003, Estuaries (26) 196-209
Ecological and paleoecological studies from the Patuxent River mouth reveal dynamic variations in benthic ostracode assemblages over the past 600 years due to climatic and anthropogenic factors. Prior to the late 20th century, centennial-scale changes in species dominance were influenced by climatic and hydrological factors that primarily affected salinity and...
Morphology and composition of the surface of Mars: Mars Odyssey THEMIS results
P. R. Christensen, J. L. Bandfield, J.F. Bell III, N. Gorelick, V.E. Hamilton, A. Ivanov, B. M. Jakosky, H. H. Kieffer, M. D. Lane, M. C. Malin, T. McConnochie, A. S. McEwen, H.Y. McSween Jr., G.L. Mehall, J.E. Moersch, K.H. Nealson, J. W. Rice Jr., M.I. Richardson, S. W. Ruff, M. D. Smith, T.N. Titus, M.B. Wyatt
2003, Science (300) 2056-2061
The Thermal Emission Imaging System (THEMIS) on Mars Odyssey has produced infrared to visible wavelength images of the martian surface that show lithologically distinct layers with variable thickness, implying temporal changes in the processes or environments during or after their formation. Kilometer-scale exposures of bedrock are observed; elsewhere airfall dust...
Effects of backpack radiotags on female northern pintails wintering in California
Joseph P. Fleskes
2003, Wildlife Society Bulletin (31) 212-219
To test whether backpack radiotags impacted the wintering biology of northern pintails (Anas acuta), I attached spear-suture (SSU, n=82 in 1993) or harness (HAR, n=337 in 1991-1993) backpack radiotags to female Hatch-Year (HY) and After-Hatch-Year (AHY) pintails after their autumn arrival in California. I evaluated impacts of radiotags on...
Modeling aqueous ferrous iron chemistry at low temperatures with application to Mars
G.M. Marion, D.C. Catling, J.S. Kargel
2003, Geochimica et Cosmochimica Acta (67) 4251-4266
Major uncertainties exist with respect to the aqueous geochemical evolution of the Martian surface. Considering the prevailing cryogenic climates and the abundance of salts and iron minerals on Mars, any attempt at comprehensive modeling of Martian aqueous chemistry should include iron chemistry and be valid at low temperatures and high...
Application of geographic information systems and remote sensing for quantifying patterns of erosion and water quality
J.C. Ritchie, D.E. Walling, J. Peters
2003, Hydrological Processes (17) 885-886
[No abstract available]...
Fire and invasive plants in California ecosystems
Jon E. Keeley
2003, Fire Management Today (63) 18-19
Use of radio telemetry in studies of shorebirds: past contributions and future directions
N. Warnock, John Y. Takekawa
2003, Wader Study Group Bulletin (100) 138-150
Early-season avian deaths from West Nile virus as warnings of human infection
S.C. Guptill, K.G. Julian, G.L. Campbell, S. D. Price, A.A. Marfin
2003, Emerging Infectious Diseases (9) 483-484
An analysis of 2001 and 2002 West Nile virus (WNV) surveillance data shows that counties that report WNV-infected dead birds early in the transmission season are more likely to report subsequent WNV disease cases in humans than are counties that do not report early WNV-infected dead birds....
Science for avian conservation: Priorities for the new millennium
J. M. Ruth, D. R. Petit, J.R. Sauer, M.D. Samuel, Fred A. Johnson, M.D. Fornwall, C. E. Korschgen, J. P. Bennett
2003, The Auk (120) 204-211
Over the past decade, bird conservation activities have become the preeminent natural resource conservation effort in North America. Maturation of the North American Waterfowl Management Plan (NAWMP), establishment of Partners in Flight (PIF), and creation of comprehensive colonial waterbird and shorebird conservation plans have stimulated unprecedented interest in, and funding...
Special Issue: INTERRAD IX - International Association of Radiolarian Paleontologists: Preface
C.D. Blome, A. Sanfilippo
2003, Conference Paper, Marine Micropaleontology
[No abstract available]...
Large carnivores response to recreational big game hunting along the Yellowstone National Park and Absaroka-Beartooth Wilderness boundary
T.E. Ruth, D.W. Smith, M.A. Haroldson, P.C. Buotte, C.C. Schwartz, H.B. Quigley, S. Cherry, D. Tyres, K. Frey
2003, Wildlife Society Bulletin (31) 1150-1161
The Greater Yellowstone Ecosystem contains the rare combination of an intact guild of native large carnivores, their prey, and differing land management policies (National Park versus National Forest; no hunting versus hunting). Concurrent field studies on large carnivores allowed us to investigate activities of humans and carnivores on Yellowstone National...
The human footprint in the west: a large-scale analysis of human impacts
Matthias Leu
2003, Fact Sheet 127-03
Background Humans have dramatically altered wildlands in the western United States over the past 100 years by using these lands and the resources they provide. Anthropogenic changes to the landscape, such as urban expansion and development of rural areas, influence the number and kinds of plants and wildlife that remain. In...
Reconnaissance-level application of physical habitat simulation in the evaluation of physical habitat limits in the Animas Basin, Colorado
Robert T. Milhous
2003, Open-File Report 2003-222
The Animas River is in southwestern Colorado and flows mostly to the south to join the San Juan River at Farmington, New Mexico (Figure 1). The Upper Animas River watershed is in San Juan County, Colorado and is located in the San Juan Mountains. The lower river is in the...
Effects of river flow regime on cottonwood leaf litter dynamics in semi-arid northwestern Colorado
D.C. Andersen, S. M. Nelson
2003, Southwestern Naturalist (48) 188-201
We compared production and breakdown of Fremont cottonwood (Populus deltoides wislizenii) leaf litter at matched floodplain sites on the regulated Green River and unregulated Yampa River in semi-arid northwestern Colorado. Litter production under trees was similar at sites in 1999 (250 g/m2, oven-dry) but lower in 2000 (215 and 130...
