Index Catalog // ScholarsArchive@OSU

Cardaria draba (L.) Desv. in the sagebrush ecosystem of northeastern Oregon

Creator:: Smergut, Teresa A.
Abstract:: Ranchers and resource managers have become concerned about the role and spread of Cardaria draba (L.) Desv. (whitetop) in the sagebrush steppe of Northeastern Oregon. This area is an important natural resource for livestock production and big game winter range. An area near Keating, Oregon was selected to study the...
Resource Type:: Masters Thesis
Full Text:: understanding during the development of the thesis. Also special thanks is extended to Dr. Larry Larson for his

Comparative seedling growth of diffuse knapweed and bluebunch wheatgrass under altered moisture and temperature regimes

Creator:: Grammon, Arnold A.
Abstract:: In many areas of the Western U.S., diffuse knapweed (Centaurea diffusa Lam.) has invaded into plant communities dominated by bluebunch wheatgrass (Pseudomegnaria spicata [Pursh] A. Love). The objectives of this study were to compare growth response of both species when grown under altered moisture and temperature regimes while in the...
Resource Type:: Masters Thesis
Full Text:: Temperature Regimes. Abstract approved: Larry L. Larson In many areas of the Western U.S diffuse

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

Benthic macroinvertebrates and sediment characteristics of a coastal dune margin lake (Carter Lake, Douglas County, Oregon)

Creator:: Wones, Andrew G.
Abstract:: Carter Lake, a freshwater, coastal dune-margin lake, was sampled at the beginning and end of the summer of 1986 to determine the sediment characteristics and benthic macroinvertebrate abundance, biomass, variety, and diversity. The distributions of major benthic habitats were estimated by snorkeling in June and July, 1986. Water temperature and...
Resource Type:: Masters Thesis
Full Text:: , Douglas County, Oregon ) Redacted for Privacy Abstract approved: d v Gary L. Larson Carter Lake, a

Ecology of kokanee salmon and rainbow trout in Crater Lake, a deep ultraoligotrophic caldera lake (Oregon)

Creator:: Buktenica, Mark W.
Abstract:: Crater Lake, originally barren of fish, was stocked on an irregular basis from 1888 through 1941 with several species of salmonids. Two species occur in the lake today--kokanee salmon (Oncorhynchus nerka) and rainbow trout (Salmo gairdneri). This study was initiated in the summer of 1986 to evaluate the ecology of...
Resource Type:: Masters Thesis
Full Text:: ). Redacted for Privacy Gary L. Larson Abstract Approved: Crater Lake, originally barren of fish, was

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

Effects of hydrology on zooplankton communities in high mountain ponds, Mount Rainier National Park

Creator:: Girdner, Scott F.
Abstract:: Ten high mountain ponds in Mount Rainier National Park, Washington State, were studied from June through September 1992 to investigate the influences of fluctuating pond volumes on zooplankton communities. A temporary pond of short wet phase duration was inhabited by zooplankton taxa with short generation times and a crustacean taxa...
Resource Type:: Masters Thesis
Full Text:: : Gary L. Larson Ten high mountain ponds in Mount Rainier National Park, Washington State, were studied

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

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

ScholarsArchive@OSU

Cardaria draba (L.) Desv. in the sagebrush ecosystem of northeastern Oregon

Comparative seedling growth of diffuse knapweed and bluebunch wheatgrass under altered moisture and temperature regimes

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

Benthic macroinvertebrates and sediment characteristics of a coastal dune margin lake (Carter Lake, Douglas County, Oregon)

Ecology of kokanee salmon and rainbow trout in Crater Lake, a deep ultraoligotrophic caldera lake (Oregon)

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

Effects of hydrology on zooplankton communities in high 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

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

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