Genetic variation in male Yellow-headed Blackbirds from the northern Great Plains
Daniel J. Twedt, William J. Bleier, George M. Linz
1992, Canadian Journal of Zoology (70) 2280-2282
Electrophoretic differences at 15 presumptive loci were used to assess allelic frequencies, heterozygosities, and polymorphism for male Yellow-headed Blackbirds (Xanthocephalus xanthocephalus) collected in east-central Alberta, north-central North Dakota, and east-central South Dakota. Five loci were polymorphic and mean heterozygosities ranged from 0.119 to 0.133. Significant differences were detected among these...
Sex and age components of variation in Proechimys cuvieri (Rodential: Echimyidae) from northern Brazil
M. Lara, Michael A. Bogan, R. Cerequeria
1992, Proceedings of the Biological Society of Washington (105) 882-888
No abstract available....
Distribution of Yellowstone grizzly bears during the 1980s
Bonnie M. Blanchard, Richard R. Knight, David J. Mattson
1992, American Midland Naturalist (128) 332-335
Grizzly bear (Ursus arctos horribilis) females with young occupied a greater proportion of area east of Yellowstone National Park during 1980-1989 compared to 1973-1979. Occupancy by all bears and females with young was lower in all peripheral areas compared to the Park, but greater east and south compared to north...
Implications of morphological variation among populations of California roach Lavinia symmetricus (Cyprinidae) for conservation policy
Larry R. Brown, Peter B. Moyle, William A. Bennett, Brian D. Quelvog
1992, Biological Conservation (62) 1-10
The California roach Lavinia symmetricus is a small cyprinid native to Central California. Populations of roach are presently isolated from one another due to degradation of stream habitats between them. We examined eight populations, each from a tributary system of the San Joaquin River, to determine if morphological differences existed among them....
Comparison of algorithms for replacing missing data in discriminant analysis
Daniel J. Twedt, D.S. Gill
1992, Communications in Statistics - Theory and Methods (21) 1567-1578
We examined the impact of different methods for replacing missing data in discriminant analyses conducted on randomly generated samples from multivariate normal and non-normal distributions. The probabilities of correct classification were obtained for these discriminant analyses before and after randomly deleting data as well as after deleted data were replaced...
Cannibalism and predation on black bears by grizzly bears in the Yellowstone ecosystem, 1975-1990
D.J. Mattson, R.R. Knight, B.M. Blanchard
1992, Journal of Mammalogy (73) 422-426
We documented one instance of an adult male grizzly bear preying upon a black bear and four instances where circumstantial evidence suggested that grizzly bears (two cubs-of-the-year, one yearling female that was injured, and one adult male) had been preyed upon by conspecifics. We also examined feces of grizzly bears...
Seismic images of a Grenvillian terrane boundary
Bernd Milkereit, D. A. Forsyth, Alan G. Green, A. Davidson, S. Hanmer, Deborah R. Hutchinson, W. J. Hinze, R.F. Mereu
1992, Geology (20) 1027-1030
A series of gently dipping reflection zones extending to mid-crustal depths is recorded by seismic data from Lakes Ontario and Erie. These prominent reflection zones define a broad complex of southeast-dipping ductile thrust faults in the interior of the Grenville orogen. One major reflection zone provides the first image of...
Yellowstone grizzly bear mortality, human habituation, and whitebark pine seed crops
David J. Mattson, Bonnie M. Blanchard, Richard R. Knight
1992, Journal of Wildlife Management (56) 432-442
The Yellowstone grizzly bear (Ursus arctos horribilis) population may be extirpated during the next 100-200 years unless mortality rates stabilize and remain at acceptable low levels. Consequently, we analyzed relationships between Yellowstone grizzly bear mortality and frequency of human habituation among bears and size of the whitebark pine (Pinus albicaulis)...
Colloid formation during waste form reaction: Implications for nuclear waste disposal
J. K. Bates, J. Bradley, A. Teetsov, C. R. Bradley, Marilyn R. Buchholtz ten Brink
1992, Science (256) 649-651
Insoluble plutonium- and americium-bearing colloidal particles formed during simulated weathering of a high-level nuclear waste glass. Nearly 100 percent of the total plutonium and americium in test ground water was concentrated in these submicrometer particles. These results indicate that models of actinide mobility and repository integrity, which assume complete solubility...
Towards a biological survey of the U.S. National Parks System
M. Ruggiero, T.J. Stohlgren, G. Waggoner
1992, Book, Science and the management of protected areas
No abstract available....
Core research center: Denver, Colorado
Water Resources Division, U.S. Geological Survey
1992, Report
No abstract available....
A technique for estimating seed production of common moist soil plants
Murray K. Laubhan
1992, Report, Waterfowl Management Handbook
Seeds of native herbaceous vegetation adapted to germination in hydric soils (i.e., moist-soil plants) provide waterfowl with nutritional resources including essential amino acids, vitamins, and minerals that occur only in small amounts or are absent in other foods. These elements are essential for waterfowl to successfully complete aspects of...
Preliminary analysis of water quality of the Barataria Unit of Jean LaFitte National Historic Park
Jill S. Baron, B. Newkirk
1992, Book
No abstract available....
The generic name for Crested Caracaras (Aves: Falconidae)
R.C. Banks, C.J. Dove
1992, Proceedings of the Biological Society of Washington (105) 420-424
No abstract available....
Book review of Acid deposition and aquatic ecosystems: regional case studies
Jill S. Baron
1992, The Quarterly Review of Biology (67) 382-385
No abstract available....
Case studies highlight concerns
D.N. Gladwin, J. E. Roelle
1992, National Wetlands Newsletter (14) 7-9
No abstract available....
Avian surveys at NAS Alameda for the Bird-Aircraft Strike Hazard (BASH) program
L.E. Ellison, L.S. Hall, J.J. Keane, M.L. Morrison
1992, Transactions of the Western Section of the Wildlife Society (28) 48-58
No abstract available....
Interdisciplinary interaction: crossing boundaries
J. G. Taylor, J. Vining
1992, Book, Human Ecology: Crossing Boundaries
No abstract available....
Enhancement and integration of airborne gamma-ray spectrometric and Landsat imagery for regolith mapping — Cape York Peninsula
J. R. Wilford, C. F. Pain, J. C. Dohrenwend
1992, Exploration Geophysics (23) 441-445
Airborne gamma-ray spectrometric data (400-m line spacing), gathered for the National Geoscience Mapping Accord North Queensland Project, has proved invaluable for differentiating regolith types based on their potassium, thorium and uranium signatures. The ability of the gamma-ray signal to penetrate the vegetation cover and as much as 40 cm below...
Topographic mapping
Water Resources Division, U.S. Geological Survey
1992, Report
The U.S. Geological Survey (USGS) produced its first topographic map in 1879, the same year it was established. Today, more than 100 years and millions of map copies later, topographic mapping is still a central activity for the USGS. The topographic map remains an indispensable tool for government, science, industry,...
A new subspecies of Chamaea fasciata (Wrentit) from Oregon (Aves: Timaliinae)
M. Ralph Browning
1992, Proceedings of the Biological Society of Washington (105) 414-419
Geographic variation in plumage color of Chamaea fasciata (Wrentit) from northern California and southern Oregon is related to climate. A new subspecies, Chamaea fasciata margra, is described from a disjunct population of southern interior Oregon. Colonization of C. fasciata in interior Oregon was perhaps from birds crossing coniferous...
Management implications
Jill S. Baron
1992, Book chapter, Biogeochemistry of a subalpine ecosystem: Loch Vale watershed
No abstract available....
National Park biotic inventories assessed
T.J. Stohlgren, M. Ruggiero, J.F. Quinn, G. Waggoner
1992, Park Science (11) 16-17
No abstract available....
Strategic and critical minerals in the midcontinent region, United States
Warren C. Day, Diane E. Lane
1992, Bulletin 1989
Chapters A, B, and C are issued as a single volume and are not available separately....
Biogeochemical fluxes
Jill S. Baron
1992, Book chapter, Biogeochemistry of a subalpine ecosystem: Loch Vale watershed
No abstract available....
