Index Catalog // ScholarsArchive@OSU

Cattle grazing in semiarid forestlands: Habitat selection during periods of drought

Creator:: Roever, C. L., DelCurto, T., Rowland, M., Vavra, M., and Wisdom, M.
Abstract:: Climate change models are predicting increased frequency and severity of droughts in arid and semiarid environments, and these areas are responsible for much of the world's livestock production. Because cattle (Bos taurus) grazing can impact the abundance, distribution, and ecological function of native plant and animal communities, it is important...
Resource Type:: Article

Comparing Vegetation and Soils of Remnant and Restored Wetland Prairies in the Northern Willamette Valley

Creator:: Taylor, Sara M. and Santelmann, Mary V.
Abstract:: Most of the native wetland prairies once found in the Willamette Valley of Oregon, USA have been converted to agriculture, developed, or altered by disturbance and cessation of burning, especially in the northern portion of the valley. Mitigation efforts by Portland Metro and the NRCS have resulted in restoration of...
Resource Type:: Article
Full Text:: Restored Wetland Prairies in the Northern Willamette Valley Taylor, S. M., & Santelmann, M. V. (2014

Physiological Response of Crocosphaera watsonii to Enhanced and Fluctuating Carbon Dioxide Conditions

Creator:: Gradoville, Mary R., White, Angelicque E., and Letelier, Ricardo M.
Abstract:: We investigated the effects of elevated pCO₂ on cultures of the unicellular N₂-fixing cyanobacterium Crocosphaera watsonii WH8501. Using CO₂-enriched air, cultures grown in batch mode under high light intensity were exposed to initial conditions approximating current atmospheric CO₂ concentrations (~400 ppm) as well as CO₂ levels corresponding to low- and...
Resource Type:: Article

Forecasting the response of Earth's surface to future climatic and land use changes: A review of methods and research needs

Creator:: Pelletier, Jon D., Murray, A. Brad, Pierce, Jennifer L., Bierman, Raul R., Breshears, David D., Crosby, Benjamin T., Ellis, Michael, Foufoula-Georgiou, Efi, Heimsath, Arjun M., Houser, Chris, Lancaster, Nick, Marani, Marco, Merritts, Dorothy J., Moore, Laura J., Pederson, Joel L., Poulos, Michael J., Rittenour, Tammy M., Rowland, Joel C., Ruggiero, Peter, Ward, Dylan J., Wickert, Andrew D., and Yager, Elowyn M.
Abstract:: In the future, Earth will be warmer, precipitation events will be more extreme, global mean sea level will rise, and many arid and semiarid regions will be drier. Human modifications of landscapes will also occur at an accelerated rate as developed areas increase in size and population density. We now...
Resource Type:: Article

The imprint of climate and geology on the residence times of groundwater

Creator:: Maxwell, Reed M., Condon, Laura E., Kollet, Stefan J., Maher, Kate, Haggerty, Roy, and Forrester, Mary Michael
Abstract:: Surface and subsurface flow dynamics govern residence time or water age until discharge, which is a key metric of storage and water availability for human use and ecosystem function. Although observations in small catchments have shown a fractal distribution of ages, residence times are difficult to directly quantify or measure...
Resource Type:: Article

Epidemiology and Population Biology of Pseudoperonospora cubensis: A Model System for Management of Downy Mildews

Creator:: Ojiambo, Peter S., Gent, David H., Quesada-Ocampo, Lina M., Hausbeck, Mary K., and Holmes, Gerald J.
Abstract:: The resurgence of cucurbit downy mildew has dramatically influenced production of cucurbits and disease management systems at multiple scales. Long-distance dispersal is a fundamental aspect of epidemic development that influences the timing and extent of outbreaks of cucurbit downy mildew. The dispersal potential of Pseudoperonospora cubensis appears to be limited...
Resource Type:: Article
Full Text:: Management of Downy Mildews Peter S. Ojiambo,1,∗ David H. Gent,2 Lina M. Quesada-Ocampo,1 Mary K. Hausbeck,3

Diversity trumps acidification : lack of evidence for carbon dioxide enhancement of Trichodesmium community nitrogen or carbon fixation at Station ALOHA

Creator:: Gradoville, Mary R., White, Angelicque E., Böttjer, Daniela, Church, Matthew J., and Letelier, Ricardo M.
Abstract:: We conducted 11 independent short-term carbon dioxide (CO₂) manipulation experiments using colonies of the filamentous cyanobacteria Trichodesmium isolated on three cruises in the North Pacific Subtropical Gyre (NPSG). Dinitrogen (N₂) and carbon (C) fixation rates of these colonies were compared over CO₂ conditions ranging from ~ 18 Pa (equivalent to...
Resource Type:: Article
Full Text:: fixation at Station ALOHA Gradoville, M. R., White, A. E., Böttjer, D., Church, M. J., & Letelier, R. M

Climate and Demography Dictate the Strength of Predator-Prey Overlap in a Subarctic Marine Ecosystem

Creator:: Hunsicker, Mary E., Ciannelli, Lorenzo, Bailey, Kevin M., Zador, Stephani, and Stige, Leif Christian
Abstract:: There is growing evidence that climate and anthropogenic influences on marine ecosystems are largely manifested by changes in species spatial dynamics. However, less is known about how shifts in species distributions might alter predator-prey overlap and the dynamics of prey populations. We developed a general approach to quantify species spatial...
Resource Type:: Article
Full Text:: of Predator-Prey Overlap in a Subarctic Marine Ecosystem Mary E. Hunsicker1*, Lorenzo Ciannelli1

Predicting fish recruitment from juvenile abundance and environmental indices

Creator:: Stige, Leif Christian, Hunsicker, Mary E., Bailey, Kevin M., Yaragina, Natalia A., and Hunt, George L., Jr.
Abstract:: Prediction of year-class strength is a critical challenge for fisheries managers. Theoretically, predictions of recruitment should be better when they are based on estimates of cohort size taken close to the age of recruitment and may improve if the effects of environmental factors that influence pre-recruit mortality are accounted for....
Resource Type:: Article
Full Text:: Christian Stige1,*, Mary E. Hunsicker2, Kevin M. Bailey3, Natalia A. Yaragina4, George L. Hunt Jr5 1Centre

Child Care Assistance for Families Involved in the Child Welfare System: Predicting Child Care Subsidy Use and Stability

Creator:: Lipscomb, Shannon T., Lewis, Kendra M., Masyn, Katherine E., and Meloy, Mary Elizabeth
Abstract:: Early child care and education programs have the potential to play a supportive role in the lives of vulnerable children and families involved in the child welfare system. Child care subsidies can help low-income families to access these programs. The current study examines the use and stability of child care...
Resource Type:: Article
Full Text:: Kendra M. Lewis University of California, Davis One Shields Avenue, Davis, CA 95616; kelew

ScholarsArchive@OSU

Cattle grazing in semiarid forestlands: Habitat selection during periods of drought

Comparing Vegetation and Soils of Remnant and Restored Wetland Prairies in the Northern Willamette Valley

Physiological Response of Crocosphaera watsonii to Enhanced and Fluctuating Carbon Dioxide Conditions

Forecasting the response of Earth's surface to future climatic and land use changes: A review of methods and research needs

The imprint of climate and geology on the residence times of groundwater

Epidemiology and Population Biology of Pseudoperonospora cubensis: A Model System for Management of Downy Mildews

Diversity trumps acidification : lack of evidence for carbon dioxide enhancement of Trichodesmium community nitrogen or carbon fixation at Station ALOHA

Climate and Demography Dictate the Strength of Predator-Prey Overlap in a Subarctic Marine Ecosystem

Predicting fish recruitment from juvenile abundance and environmental indices

Child Care Assistance for Families Involved in the Child Welfare System: Predicting Child Care Subsidy Use and Stability

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