Index Catalog // ScholarsArchive@OSU

A model for understanding the influence of selective and nonselective harvest on fish populations

Creator:: Hirai, Takayuki
Abstract:: To understand the influence of selective harvesting on the adaptive capacity of fish populations in changing environments, a computer simulation model was developed. In the model, hypothetical populations were composed of five different life histories, which were genetically determined. Each life history type had its own rate of survival and...
Resource Type:: Masters Thesis
Full Text:: for Privacy Dean of Grda e bcnooll Ot Date thesis is presented 8 September 1987 Typed by Chie Hirai

A Study of Vegetation Change Over Time in the Salt Marshes of the Salmon River Estuary, Oregon

Creator:: Schrank, Keaton A.
Abstract:: The salt marshes of the Salmon River Estuary, Oregon have been of interest for decades due to their disturbance and restoration history, as well as the presence of long-term vegetation transects that were established as early as the 1970s. Vegetation abundance data have been gathered in the four sites of...
Resource Type:: Masters Thesis
Full Text:: . Robert Kennedy, and Dr. David Bernell for their input and support of this work. Many thanks to Dr

Activity and persistence of five postemergence grass herbicides in soil

Creator:: Martin, David C. (David Christopher), 1949-
Resource Type:: Masters Thesis
Full Text:: Dean of Graa (7 e cnooi Date thesis presented July 25, 1985 Typed by Judith A. Martin for David C

An examination of several methods of quantifying forest structure in headwater riparian forests of western Oregon

Creator:: Haxton, Zane A.
Abstract:: Headwater streams are generally small, first-order streams that can comprise up to 80% (by stream length) of the drainage network in mountainous areas of the Pacific Northwest. These streams are intimately connected with downstream reaches, serving as a source of sediment, woody debris, organic matter and nutrients. The surrounding forests...
Resource Type:: Masters Thesis
Full Text:: toward the light at the end of a long tunnel. Many thanks to David Haxton and Rachel Medema. This

Beyond the Benthos: The effects of stream restoration on habitat complexity and aquatic and riparian macroinvertebrate assemblages

Creator:: Lotz, Kelsey L.
Abstract:: Aquatic and riparian systems in the western United States have been highly modified by anthropogenic impacts since Euro-American settlement. Ecological restoration is a practice that has been widely conducted around the world to mitigate the degradation of these systems. The majority of stream restoration efforts have focused on improving in-stream...
Resource Type:: Masters Thesis
Full Text:: Assemblages. Abstract approved: _____________________________________________________ David E. Wooster

Bridging Data and Theory: Developing Physics Informed Machine Learning for Snow Hydrology

Creator:: Steele, Hannah
Abstract:: Snow is a critical component of global climate regulation and provides water resources to over one billion people worldwide. Yet current measurement methods and modeling techniques lack the ability to fully capture snow characteristics such as snow water equivalent (SWE), snow depth, and density variable landscapes. In recent years, the...
Resource Type:: Masters Thesis
Full Text:: ) 𝑑𝜌𝑠(𝑧) 𝑑𝑡 = 𝐶1𝑊𝑠(𝑧)𝑒 0.08𝑇𝑠(𝑧)−𝐶2𝜌𝑠(𝑧) (1) Where ρs(z) is snow density at height

Butterfly and flower community composition among prairie-oak ecosystem habitats in the Willamette Valley, Oregon

Creator:: Powers, Breanna F.
Abstract:: Prairie-oak ecosystems in the Willamette Valley, Oregon have experienced habitat loss and degradation; most of these ecosystems are fragmented into smaller patches. Prairie-oak butterfly species, in the Willamette Valley, have decreased dramatically due to loss or degradation of habitat. More research is needed on sustaining the populations of butterflies in...
Resource Type:: Masters Thesis
Full Text:: , Oregon. Noss, R. F., L. E. T. III, and M. J. Scott. 1995. Endangered Ecosystems of the United States

Calochortus howellii : ecology of a rare serpentine endemic, and comparison with the new species, C. umpquaensis (Liliaceae)

Creator:: Fredricks, Nancy Ann
Resource Type:: Masters Thesis
Full Text:: . Ed Guerrant, and Dr. David Hibbs for their constructive comments and careful reading of the

Cavity resources in Oregon white oak and Douglas-fir stands in the mid-Willamette Valley, Oregon

Creator:: Gumtow-Farrior, Daniel L.
Abstract:: Previous studies of bird communities in the mid-Willamette Valley, Oregon, indicated that Oregon white oak (Ouercus garryana) stands supported more cavity-using bird species than sympatric stands of Douglas-fir (Pseudotsuga menziesii). Mature Oregon oak stands are being harvested and few are regenerating. I compared cavity availability for hole-using fauna among 10...
Resource Type:: Masters Thesis

Chaparral history, dynamics, and response to disturbance in southwest Oregon : insights from age structure

Creator:: Duren, Olivia
Abstract:: Fuels management on Bureau of Land Management lands in SW Oregon, USA, is motivated by the needs to reduce fire hazard and restore ecosystems thought to be impacted by fire suppression. Chaparral is one of the most characteristic vegetation communities of SW Oregon's interior valleys, and extensive acreages within this...
Resource Type:: Masters Thesis
Full Text:: fire), (e) shrubs that survived the last known fire (≥ 20 yr older than last known fire), or (f

ScholarsArchive@OSU

A model for understanding the influence of selective and nonselective harvest on fish populations

A Study of Vegetation Change Over Time in the Salt Marshes of the Salmon River Estuary, Oregon

Activity and persistence of five postemergence grass herbicides in soil

An examination of several methods of quantifying forest structure in headwater riparian forests of western Oregon

Beyond the Benthos: The effects of stream restoration on habitat complexity and aquatic and riparian macroinvertebrate assemblages

Bridging Data and Theory: Developing Physics Informed Machine Learning for Snow Hydrology

Butterfly and flower community composition among prairie-oak ecosystem habitats in the Willamette Valley, Oregon

Calochortus howellii : ecology of a rare serpentine endemic, and comparison with the new species, C. umpquaensis (Liliaceae)

Cavity resources in Oregon white oak and Douglas-fir stands in the mid-Willamette Valley, Oregon

Chaparral history, dynamics, and response to disturbance in southwest Oregon : insights from age structure

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