Index Catalog // ScholarsArchive@OSU

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

Creator:: Sobota, Daniel J.
Abstract:: Land use alters the physical and biological structure of stream ecosystems and potentially alters their capacity to process nitrogen (N), an essential nutrient that has nearly doubled in abundance on the biosphere during the past century from human activities. In this dissertation, I quantified uptake and transformation of nitrate (NO₃⁻)...
Resource Type:: Dissertation
Full Text:: . Title: Linkages among Land Use, Riparian Zones, and Uptake and Transformation of Nitrate in Stream

Environmental contaminants and ecology of bald eagles in southcentral Oregon

Creator:: Frenzel, Richard Wilmarth
Abstract:: Food habits and levels of organochlorine compounds, lead, and mercury in resident and wintering bald eagles were studied in southcentral Oregon and California, 1979-83. Food habits were assessed by examination of castings from winter communal roosts, identification of 2938 prey items found at nest sites and foraging areas, and observations...
Resource Type:: Dissertation
Full Text:: Title: Environmental Contaminants and Ecology of Bald Eagles in Southcentral Oregon Abstract approved

Effect of livestock grazing on native bees in a Pacific Northwest bunchgrass prairie

Creator:: Kimoto, Chiho
Abstract:: Native bees play an important role as pollinators of natural vegetation and agricultural crops. Yet many pollinators, including some native bees, are declining in numbers. Some of the potential causes of these declines are habitat destruction and degradation by various human land uses, including urban development and sprawl, construction of...
Resource Type:: Masters Thesis
Full Text:: objectives: 1) describe the native bee community in the Zumwalt Prairie in northeastern Oregon, which is

A multi-trophic level examination of recreational impacts on a national wild and scenic river

Creator:: Wright, Kristopher Keith
Abstract:: Initially, components of an aquatic food web were examined to study impacts of recreational use on the aquatic ecology of Quartzville Creek, Oregon in 1995 and 1996. Measurements of the food web components consisted of observations of harlequin ducks (Histrionicus histrionicus), visual counts of the larval caddisfly Dicosmoecus gilvipes, benthic...
Resource Type:: Masters Thesis
Full Text:: use on the aquatic ecology of Quartzville Creek, Oregon in 1995 and 1996. Measurements of the food

Spatial and temporal dynamics of sediment and wood in headwater streams in the central Oregon Coast Range

Creator:: May, Christine L.
Abstract:: Channels that were scoured to bedrock by debris flows provided unique opportunities to calculate the rate of sediment and wood accumulation, to make inferences about processes associated with input and transport of sediment, and to gain insight into the temporal succession of channel morphology following disturbance. In an intensive investigation...
Resource Type:: Dissertation
Full Text:: Temporal Dyi-iamics of Sediment and Wood in Headwater Streams in the Oregon Coast Range. Abstract

Effects of a 4-inch suction dredge on benthic macroinvertebrates in southwestern Oregon

Creator:: Perez, Diana H.
Abstract:: Effects of 4-inch (10.16 cm) suction dredge mining on benthic macroinvertebrates in 3rd to 4th order streams were investigated in 1996 by evaluating four mining claim operations in Althouse Creek, Sucker Creek, and Taylor Creek in southwestern Oregon's Rogue River basin. The effects were site-specific. The study showed no significant...
Resource Type:: Masters Thesis
Full Text:: macroinvertebrates in southwestern Oregon AN ABSTRACT OF THE THESIS OF Diana H. Perez for the degree ofMaster of

The Impacts of Multiple Stressors on Aquatic Invertebrate Communities in the Umatilla River

Creator:: Clark, Hannah
Abstract:: Rivers impacted by human activities often have multiple stressors present. The effects of multiple stressors on biological communities can often be difficult to predict, due to the potential for complex interactions between stressors and communities. This thesis explores the impacts of two stressors often associated with agricultural land use, increased...
Resource Type:: Masters Thesis
Full Text:: A THESIS submitted to Oregon State University in partial

Influences of clearcut logging on macroinvertebrates in perennial and intermittent headwaters of the Central Oregon Coast Range

Creator:: Banks, Janel
Abstract:: This research was designed to broaden the understanding of how timber-harvest affects aquatic macroinvertebrates in perennial and intermittent headwater streams. This study compared emergent and benthic macroinvertebrate assemblages from 20 headwater streams in the central Oregon Coast Range that varied by harvest condition and flow duration. Through comparison of the...
Resource Type:: Masters Thesis
Full Text:: Intermittent Headwaters of the Central Oregon Coast Range Abstract approved: Dr. Alan T

Foraging behavior of the Pacific harbor seal (Phoca vitulina richardii) in the Pacific Northwest and potential impacts of coastal hypoxia on foraging efficiency

Creator:: Steingass, Sheanna M.
Abstract:: In the last decade, the California Current Large Marine Ecosystem has experienced a trend of increased severity of upwelling-driven coastal hypoxia. This thesis strove to examine the potential upper trophic level impacts of moderate and severe hypoxia in the CCLME. Initially I conducted a literature review of Pacific harbor seal...
Resource Type:: Masters Thesis
Full Text:: regions of Oregon and Washington. Thirteen papers were reviewed which detailed harbor seal foraging

Gravel disturbance impacts on salmon habitat and stream health : volume 1 : summary report

Creator:: Williamson, Kenneth J., Bella, David A., Beschta, Robert L., Grant, Gordon, Klingeman, Peter C., Li, Hiram W., and Nelson, Peter O.
Abstract:: In this report, a response is given to the charge of this study. Volume I: Summary Report includes a synopsis of the technical considerations followed by the main findings and recommendations. The full technical background for these summary statements is given in detail in Volume II: Technical Background Report, and...
Resource Type:: Technical Report
Full Text:: : a report for the Oregon Division of State Lands Gravel Disturbance Impacts on Salmon Habitat and

ScholarsArchive@OSU

Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

Environmental contaminants and ecology of bald eagles in southcentral Oregon

Effect of livestock grazing on native bees in a Pacific Northwest bunchgrass prairie

A multi-trophic level examination of recreational impacts on a national wild and scenic river

Spatial and temporal dynamics of sediment and wood in headwater streams in the central Oregon Coast Range

Effects of a 4-inch suction dredge on benthic macroinvertebrates in southwestern Oregon

The Impacts of Multiple Stressors on Aquatic Invertebrate Communities in the Umatilla River

Influences of clearcut logging on macroinvertebrates in perennial and intermittent headwaters of the Central Oregon Coast Range

Foraging behavior of the Pacific harbor seal (Phoca vitulina richardii) in the Pacific Northwest and potential impacts of coastal hypoxia on foraging efficiency

Gravel disturbance impacts on salmon habitat and stream health : volume 1 : summary report

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