Index Catalog // ScholarsArchive@OSU

The effects of water and shade treatments on photosynthesis and root-rhizosphere respiration in young ponderosa pine

Creator:: Johnson, Theresa J.
Abstract:: Water treatments were applied to young ponderosa pine trees in the Eastern Cascades, Oregon during the 2003 growing season, and shade treatments were applied during the 2003 and 2004 growing seasons to understand how photosynthesis and soil respiration, particularly the root/rhizosphere fraction (R[subscript rrh]), would respond to increased moisture availability...
Resource Type:: Masters Thesis

Hydrological consequences of two native shrubs in semi-arid Senegal : patterns, processes, concepts and methods

Creator:: Kizito, Fred
Abstract:: Water availability is a critical limiting element in semi-arid ecosystem productivity and presents particular challenges in Sahelian countries such as Senegal. The landscapes are characterized by the presence of two common semi-arid shrubs (Piliostigma reticulatum and Guiera senegalensis), both of which may be important hydraulic regulators in these water-limited ecosystems....
Resource Type:: Dissertation
Full Text:: efficiency (Kizito et al., 2005). The impact of shrubs on the overall water balance and hydrology of agro

Seasonal floodplain wetlands as fish habitat in Oregon and Washington

Creator:: Baker, Cynthia F.
Abstract:: To begin to understand freshwater seasonal floodplain fish communities in the context of human alteration of the physical system, species introductions and wetland restoration efforts, I studied fish assemblages in fifteen seasonal floodplain wetlands within four geographic regions (coastal, upper Columbia River estuary, Puget Sound and eastern Oregon/Washington) in the...
Resource Type:: Dissertation
Full Text:: . Number of CW fish ingressing into LaCenter wetland (November 2005) and daily average water level

Comparison of the water relations characteristics of woody plants in western Oregon

Creator:: Davis, Kent J.
Abstract:: I studied the water relations traits, twig conductivity, C'3 isotopic composition, and wood density of three conifer and five angiosperm species in western Oregon. This study took place from spring 2002 to fall 2003 on four sites. Species were selected to represent the diversity of drought tolerance of woody plants...
Resource Type:: Masters Thesis
Full Text:: Osmotic and Cell Wall Elasticity Adjustment: Maintenance of turgor at low water potentials depends on the

Bioaccumulation profiles of chemical contaminants in fish from the lower Willamette River, Portland Harbor superfund site and human health risk assessment

Creator:: Sethajintanin, Doolalai
Abstract:: Concentrations of twenty-five PCBs, fifteen organochiorine pesticides and mercury were determined in recreational fish from the Willamette River, Oregon during the summer of 2000. Thirty-six fish samples of three fish species including black crappie, smalimouth bass and con-rn-ion carp were analyzed. The data reported here provides new information and recent...
Resource Type:: Masters Thesis
Full Text:: examine difference in means of lipid-effect, site-effect and species-effect on analyte concentrations

Floodplain vegetation following over 80 years of intensive land use and de-watering : Lower Owens River, California

Creator:: Risso, Derek A.
Abstract:: Riparian areas in the arid western United States are critical ecosystems that have been severely degraded by a variety of land and water uses over the last 100 years. In this study, the composition and structure of floodplain vegetation along the Lower Owens River in eastern California was quantitatively described...
Resource Type:: Masters Thesis
Full Text:: critical to successful restoration of riparian systems. Land Use and Water Diversion: Effects on

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:: of both single and multiple stressors (fine sediment addition and reduced water discharge) on

The effects of irrigation water withdrawals on macroinvertebrate community structure and life history strategies

Creator:: Miller, Scott W.
Abstract:: I used current water management practices in central and eastern Oregon and Washington as natural experiments to quantify the effects of irrigation water withdrawals on macroinvertebrate community structure and life history strategies. Reduced discharge had direct (e.g. decreased velocity and wetted habitat) and indirect (e.g. increased conductivity and temperature) effects...
Resource Type:: Dissertation
Full Text:: . Title: The Effects of Irrigation Water Withdrawals on Macroinvertebrate Community Structure and Life

Aquatic community responses to drought disturbance: experimental manipulations of top predator extinctions and stream drying

Creator:: Boersma, Kate S.
Abstract:: Although it is generally assumed that the intensifying abiotic environment is the primary effect of drought on aquatic organisms, drought-induced top predator extinctions may be an important underlying mechanism. I used manipulative experiments to disentangle the impacts of drying and top predator extinctions on arid-land aquatic invertebrate communities. I then...
Resource Type:: Dissertation
Full Text:: generally assumed that the intensifying abiotic environment is the primary effect of drought on aquatic

Analysis of spillway hydrodynamics for total dissolved gas prediction downstream of hydropower projects with free, plunging spillway jets

Creator:: Germann, Nathan A.
Abstract:: During spring and early summer hydropower projects are often forced to spill water through their spillways due to increased river flows of the runoff season. Flows which are directed through spillways--instead of through turbines--contain a substantial amount of energy. Stemming from the high energy content, spillway flows entrain air at...
Resource Type:: Masters Thesis
Full Text:: of the key items on the list. Also introduced with the 2000 BiOp was the Water Quality Plan for

ScholarsArchive@OSU

The effects of water and shade treatments on photosynthesis and root-rhizosphere respiration in young ponderosa pine

Hydrological consequences of two native shrubs in semi-arid Senegal : patterns, processes, concepts and methods

Seasonal floodplain wetlands as fish habitat in Oregon and Washington

Comparison of the water relations characteristics of woody plants in western Oregon

Bioaccumulation profiles of chemical contaminants in fish from the lower Willamette River, Portland Harbor superfund site and human health risk assessment

Floodplain vegetation following over 80 years of intensive land use and de-watering : Lower Owens River, California

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

The effects of irrigation water withdrawals on macroinvertebrate community structure and life history strategies

Aquatic community responses to drought disturbance: experimental manipulations of top predator extinctions and stream drying

Analysis of spillway hydrodynamics for total dissolved gas prediction downstream of hydropower projects with free, plunging spillway jets

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