Index Catalog // ScholarsArchive@OSU

Nesting pair density and abundance of ferruginous hawks (Buteo regalis) and golden eagles (Aquila chrysaetos) from aerial surveys in Wyoming

Creator:: Olson, Lucretia E., Oakleaf, Robert J., Squires, John R., Wallace, Zachary P., and Kennedy, Patricia L.
Abstract:: Raptors that inhabit sagebrush steppe and grassland ecosystems in the western United States may be threatened by continued loss and modification of their habitat due to energy development, conversion to agriculture, and human encroachment. Actions to protect these species are hampered by a lack of reliable data on such basic...
Resource Type:: Article
Full Text:: LUCRETIA E. OLSON1 U.S.D.A., Rocky Mountain Research Station, Missoula, MT 59801 U.S.A. ROBERT J. OAKLEAF

Human-made structures, vegetation, and weather influence ferruginous hawk breeding performance

Creator:: Wallace, Zachary P., Kennedy, Patricia L., Squires, John R., Olson, Lucretia E., and Oakleaf, Robert J.
Abstract:: Studies of anthropogenic impacts on wildlife may produce inconclusive or biased results if they fail to account for natural sources of variation in breeding performance and do not use probabilistic sampling at a scale functional for management. We used stratified random sampling and generalized linear mixed models to test hypotheses...
Resource Type:: Article

Re-Occupancy of Breeding Territories by Ferruginous Hawks in Wyoming: Relationships to Environmental and Anthropogenic Factors

Creator:: Wallace, Zachary P., Kennedy, Patricia L., Squires, John R., Oakleaf, Robert J., Olson, Lucretia E., and Dugger, Katie M.
Abstract:: Grassland and shrubland birds are declining globally due in part to anthropogenic habitat modification. Because population performance of these species is also influenced by non-anthropogenic factors, it is important to incorporate all relevant ecological drivers into demographic models. We used design-based sampling and occupancy models to test relationships of environmental...
Resource Type:: Article

Precise dating of the Holmatindur cooling event in eastern Iceland: Evidence for mid-Miocene bipolar glaciation

Creator:: Duncan, Robert A. and Helgason, J.
Abstract:: A succession of basaltic lavas, volcaniclastic sediments, and lignite beds in the Holmatindur region of eastern Iceland provides the means for tying magnetic reversal stratigraphy and a record of major North Atlantic cooling to a precise radiometric timescale. A prominent part of the section is the Holmatindur classic bed, which...
Resource Type:: Article
Full Text:: Atmospheric Sciences, Oregon State University, Corvallis J. Helgason EKRA Geological Consulting, Reykjavik

Spatial and temporal distribution of a C-like asthenoshpheric component in the Rano Rahi Seamount Field, East Pacific Rise, 15°-19°S

Creator:: Hall, L. S., Mahoney, J. J., Sinton, J. M., and Duncan, Robert A.
Abstract:: Lavas of the Rano Rahi seamount field define a Nd-Pb-Sr isotopic array that connects, and substantially overlaps, the arrays of the nearby East Pacific Rise axis and 5.6–28 Ma lavas of the Pukapuka ridge system, situated between the seamount field and French Polynesia. Dating of Rano Rahi samples by ⁴⁰Ar-³⁹Ar...
Resource Type:: Article
Full Text:: asthenospheric component in the Rano Rahi Seamount Field, East Pacific Rise, 15�–19�S L. S. Hall, J. J. Mahoney

The spring transition in currents over the Oregon continental shelf

Creator:: Huyer, Adrianna, 1945-, Sobey, E. J. C., and Smith, Robert L. (Robert Lloyd), 1935-
Abstract:: Current meter moorings maintained over the Oregon continental shelf in 1973 and 1975 clearly show the difference between winter and spring oceanographic regimes and the rapid transition between the regimes. In winter the mean alongshore current is northward at all depths and strongest near shore; there is no mean vertical...
Resource Type:: Article
Full Text:: Currents Over The Oregon Continental Shelf A. HUYER, E. J. C. SOBEY,' AND R. L. SMITH School of

Competitive Altruism Explains Labor Exchange Variation in a Dominican Community

Creator:: Macfarlan, Shane J., Remiker, Mark, and Quinlan, Robert
Abstract:: Smallholder farmers rely on labor exchange to generate agricultural work when cash is rare and credit unavailable. Reciprocal altruism, biased by genetic kinship, has been implicated as the mechanism responsible for labor exchange; however, few empirical tests confirm this proposition. Competitive altruism could be operating if people differ in ability...
Resource Type:: Article
Full Text:: Explains Labor Exchange Variation in a Dominican Community Shane J. Macfarlan, Mark Remiker, and Robert

An Observation of Clostridium perfringens in Greater Sage-Grouse

Creator:: Hagen, Christian A. and Bildfell, Robert J.
Abstract:: Mortality due to infectious diseases is seldom reported in the Greater Sage-Grouse (Centrocercus urophasianus). A case of necrotic enteritis associated with Clostridium perfringens type A is described in a free-ranging adult male sage-grouse in eastern Oregon. Clostridial enteritis is known to cause outbreaks of mortality in various domestic and wild...
Resource Type:: Article
Full Text:: Observation of Clostridium perfringens in Greater Sage-Grouse Christian A. Hagen1,3 and Robert J. Bildfell2 1

Linking Wolves and Plants: Aldo Leopold on Trophic Cascades

Creator:: Ripple, William J. and Beschta, Robert L.
Abstract:: Aldo Leopold, perhaps best known for his revolutionary and poignant essays about nature, was also an eloquent advocate during the 1930s and 1940s of the need to maintain wolves and other large carnivores in forest and range ecosystems.He indicated that their loss set the stage for ungulate irruptions and ecosystem...
Resource Type:: Article
Full Text:: Plants: Aldo Leopold on Trophic Cascades Author(s): WILLIAM J. RIPPLE and ROBERT L. BESCHTA Source

Kinetic Mechanism of the Hydrogen-Oxidizing Hydrogenase from Soybean Nodule Bacteroids

Creator:: Arp, Daniel J. and Burris, Robert H.
Abstract:: The kinetic mechanism of the unidirectional H2-oxidizing hydrogenase from soybean nodule bacteroids has been investigated with highly purified enzyme. Measurements of the K, for H2 vary from 0.97 to 2.6 pM, and the K,,, for methylene blue varies from 6 to 17 pM. With H2 and methylene blue as substrates,...
Resource Type:: Article
Full Text:: Hydrogen-Oxidizing Hydrogenase from Soybean Nodule Bacteroids? Daniel J. Arp and Robert H. Burris

ScholarsArchive@OSU

Nesting pair density and abundance of ferruginous hawks (Buteo regalis) and golden eagles (Aquila chrysaetos) from aerial surveys in Wyoming

Human-made structures, vegetation, and weather influence ferruginous hawk breeding performance

Re-Occupancy of Breeding Territories by Ferruginous Hawks in Wyoming: Relationships to Environmental and Anthropogenic Factors

Precise dating of the Holmatindur cooling event in eastern Iceland: Evidence for mid-Miocene bipolar glaciation

Spatial and temporal distribution of a C-like asthenoshpheric component in the Rano Rahi Seamount Field, East Pacific Rise, 15°-19°S

The spring transition in currents over the Oregon continental shelf

Competitive Altruism Explains Labor Exchange Variation in a Dominican Community

An Observation of Clostridium perfringens in Greater Sage-Grouse

Linking Wolves and Plants: Aldo Leopold on Trophic Cascades

Kinetic Mechanism of the Hydrogen-Oxidizing Hydrogenase from Soybean Nodule Bacteroids

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