Index Catalog // ScholarsArchive@OSU

The uptake and retention of cesium-134 in Microtus canicaudus Miller

Creator:: Lei, Wayne
Abstract:: A study was performed to assess the uptake and retention patterns of cesium-134 in the gray-tailed vole, Microtus canicaudus Miller. To furnish a realistic source of contaminated food for the voles, wheat seedlings were raised in hydroponic solutions to provide radiocesium labeled wheat clippings. The hydroponic system was designed to...
Resource Type:: Masters Thesis
Full Text:: for Privacy , Larry G. Forslund Redacted for Privacy David L. Willis A study was performed to

The species composition, density, and distribution of the littoral zooplankton assemblage in Crater Lake, Oregon

Creator:: Warncke, William Madara
Abstract:: The species compositions and densities of the littoral and pelagic zooplankton assemblages in Crater Lake were compared. The littoral and pelagic zooplankton assemblages of most lakes are typically different due to different habitat conditions in the two zones. The littoral zone of Crater Lake lacks many of the habitat characteristics,...
Resource Type:: Masters Thesis
Full Text:: Lake, Oregon. Abstract approved: Gary L. Larson The species compositions and densities of the

The effects of defoliation on yellow starthistle (Centaurea solstitialis L.) reproductive capacity

Creator:: Schumacher, Stacy
Abstract:: Yellow starthistle (Centaurea solstitialis L.) is an introduced Asteraceae that has become established on 10 million acres in the Pacific Northwest and California. This weed functions as an annual or short-lived perennial and depends on seeds for reproduction. Strategies of control that reduce plant fitness or lower seed production or...
Resource Type:: Masters Thesis
Full Text:: on Yellow Starthistle (Centaurea soistitialis L.) Reproductive Capacity. Abstract approved Yellow

Structure, abundance, and distribution of pelagic zooplankton in a deep, oligotrophic Caldera Lake

Creator:: Karnaugh, Elena N.
Abstract:: From July 1985 to April 1987 the pelagic zooplankton community of Crater Lake, Oregon was studied to determine taxonomic structure, absolute and relative densities, and spatial and temporal distributional patterns. Samples were collected using vertically-towed zooplankton nets. The community structure consisted of two cladoceran and nine rotifer species, which were...
Resource Type:: Masters Thesis
Full Text:: : Redacted for Privacy Gary L. Larson From July 1985 to April 1987 the pelagic zooplankton community of

Some possible roles for selenium in the reproductive physiology of the male graytailed vole (Microtus canicaudus)

Creator:: Whitfield, Stephen Curtiss
Abstract:: The testes of the gray-tailed vole (Microtus canicaudus Miller) exhibited a high affinity for selenium relative to other selected tissues. Uptake of selenium-75 in the testis-epididymis complex was delayed relative to uptake by the whole body, kidney, and liver. This pattern of uptake suggested that selenium was metabolically incorporated into...
Resource Type:: Masters Thesis
Full Text:: Larry G.Foislund Redacted for privacy David L. Willis The testes of the gray-tailed vole (Microtus

Responses to fertilization and fish stocking in the pelagic ecosystem of a naturally fishless lake

Creator:: Cameron, William A.
Abstract:: Ecologists have studied the responses of pelagic ecosystems to varying levels of nutrient loading and fish predation on many different scales ranging from small experimental enclosures to whole lake systems. There are recurring patterns of response to these two variables, which are generally predictable on the basis of biogeographic, behavioral,...
Resource Type:: Masters Thesis
Full Text:: Redacted for Privacy Gary L. Larson Ecologists have studied the responses of pelagic ecosystems to

Life-history, growth and interference of cheatgrass (Bromus tectorum L.) and yellow starthistle (Centaurea solstitialis L.)

Creator:: Sheley, Roger Leslie
Abstract:: Cheatgrass (Bromus tectorum L.) and yellow starthistle (Centaurea soistitialis L.) have invaded over 3 million ha of grasslands in the western U.S. Future management will require an understanding of the conditions, mechanisms, and processes which control species dominance, community dynamics, and desirable plant establishment in these alien dominated annual rangelands....
Resource Type:: Dissertation

Life-history organization of cutthroat trout in Yellowstone Lake and its management implications

Creator:: Gresswell, Robert E.
Abstract:: Life-history organization of the cutthroat trout (Oncorhvnchus clarki) may be viewed at various levels, including species, subspecies, metapopulation, population, or individual. Each level varies in spatial scale and temporal persistence, and components at each level continually change with changes in environment. Cutthroat trout are widely distributed throughout the western USA,...
Resource Type:: Dissertation
Full Text:: : William J. Liss Abstract approved: Gary L. Larson Life-history organization of the cutthroat trout

Habitat segregation of two ambystomatids in mountain ponds, Mount Rainier National Park

Creator:: Brokes, Brendan J.
Abstract:: Ambystoma macrodactylum (long-toed salamander) and A. gracile (northwestern salamander) are two common salamander species occupying key trophic positions in mountain ponds of Mount Rainier National Park. The objective of this research was to document and evaluate the distributions and abundances of the two species, relative to habitat characteristics of ponds...
Resource Type:: Masters Thesis
Full Text:: like to thank Gary Larson for his encouragement and direction throughout the thesis process. He

Factors influencing spawning migration of bull trout (Salvelinus confluentus) in the North Fork Skokomish River, Olympic National Park, Washington

Creator:: Brenkman, Samuel J.
Abstract:: Distribution and life history characteristics of lacustrine-adfluvial bull trout (Salvelinus confluentus) were described in the North Fork Skokomish River Basin (including Lake Cushman, a reservoir) from 1994 to 1996. Day snorkeling was conducted in the river to determine initiation of the bull trout spawning migration, abundance of spawners, and duration...
Resource Type:: Masters Thesis
Full Text:: : Gary L. Larson Distribution and life history characteristics of lacustrine-adfluvial bull trout

ScholarsArchive@OSU

The uptake and retention of cesium-134 in Microtus canicaudus Miller

The species composition, density, and distribution of the littoral zooplankton assemblage in Crater Lake, Oregon

The effects of defoliation on yellow starthistle (Centaurea solstitialis L.) reproductive capacity

Structure, abundance, and distribution of pelagic zooplankton in a deep, oligotrophic Caldera Lake

Some possible roles for selenium in the reproductive physiology of the male graytailed vole (Microtus canicaudus)

Responses to fertilization and fish stocking in the pelagic ecosystem of a naturally fishless lake

Life-history, growth and interference of cheatgrass (Bromus tectorum L.) and yellow starthistle (Centaurea solstitialis L.)

Life-history organization of cutthroat trout in Yellowstone Lake and its management implications

Habitat segregation of two ambystomatids in mountain ponds, Mount Rainier National Park

Factors influencing spawning migration of bull trout (Salvelinus confluentus) in the North Fork Skokomish River, Olympic National Park, Washington

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