Index Catalog // ScholarsArchive@OSU

Ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae)

Creator:: Campanella, Donald M.
Abstract:: A study consisting of three parts was undertaken to investigate how variation in species interactions, population genetic structure, epidemiological parameters, and plant breeding system may influence the ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae). Interactions between natural enemy species may modify their net effect on...
Resource Type:: Dissertation
Full Text:: Botany and Plant Pathology presented on May 6, 2009. Title: Ecology and Biological Control of an

An ecological reconnaissance of the artemisia steppe on the east central Owyee uplands of Oregon

Creator:: Culver, Roger Norman
Abstract:: As the management of range lands is intensified or as improvement activity is increased, a critical need is seen to refine the understanding of the ecology of these lands. If soil surveys on range lands are to be meaningful and useful, the relationship between the fundamental ecological units and the...
Resource Type:: Masters Thesis
Full Text:: the east central Owyhee uplands of Oregon AN ABSTRACT OF THE THESIS OF ROGER NORMAN CULVER for the

The ecological consequences of the reduction of species diversity : experimental approaches

Creator:: Allison, Gary William
Abstract:: The influence of loss of diversity on community dynamics and ecosystem functioning has recently received considerable attention. Although study of biodiversity has a long history within ecology, empirical investigations exploring consequences of loss have been rare. Because many factors confound diversity comparisons, experimental manipulations of diversity offer the most direct...
Resource Type:: Dissertation
Full Text:: ecology, empirical investigations exploring consequences of loss have been rare. Because many factors

Coarse woody debris in streams of the Drift Creek Basin, Oregon

Creator:: Veldhuisen, Curt N.
Abstract:: This study examined the occurrence of coarse woody debris (i.e., pieces greater than 0.15 m in diameter and 2.0 m in length) in first- through fifth-order streams located within the Drift Creek Basin of the Oregon Coast Range. Nine "tributary reaches" were surveyed to determine how three land management treatments...
Resource Type:: Masters Thesis

Livestock, deer and logging interactions in the lodgepole pine/pumice region of central Oregon

Creator:: Stuth, Jerry W.
Abstract:: The objectives of this study were to: 1) determine production of plant species and utilization by cattle, sheep and deer as related to plant communities and timber management practices and 2) evaluate the interaction of range use between cattle and deer and between sheep and deer as affected by site...
Resource Type:: Dissertation
Full Text:: pine-pumice region of central Oregon AN ABSTRACT OF THE THESIS OF Jerry Wayne Stuth for the degree

Correspondence of soil properties and classification units with sagebrush communities in southeastern Oregon

Creator:: Lentz, Rodrick David
Abstract:: This research employed multivariate analytical techniques to statistically examine the relationship between individual soillandscape units (SLUs) in Southeastern Oregon and their associated sagebrush communities. The objective was to determine if soil properties between SLUs differed, describe the variation, and verify that these differences were reflected in the taxonomic class of...
Resource Type:: Masters Thesis
Full Text:: with Sagebrush Communities in Southeastern Oregon AN ABSTRACT OF THE THESIS OF Rodrick D. Lentz for

Effect of western juniper on understory herbage production in Central Oregon

Creator:: Vaitkus, Milda R.
Abstract:: Evidence suggests that western juniper (Juniperus occidentalis) in Central Oregon affects understory production and composition. As trees increase in size and density, understory production is reduced and composition changes. This study was designed to identify the relationship between production and composition of understory vegetation and various tree canopy sizes of...
Resource Type:: Masters Thesis
Full Text:: in Central Oregon AN ABSTRACT OF THE THESIS OF Milda R. Vaitkus for the degree of Master of

Abundance and community composition of arboreal spiders : the relative importance of habitat structure, prey availability and competition

Creator:: Halaj, Juraj
Abstract:: This work examined the importance of structural complexity of habitat, availability of prey, and competition with ants as factors influencing the abundance and community composition of arboreal spiders in western Oregon. In 1993, I compared the spider communities of several host-tree species which have different branch structure. I also assessed...
Resource Type:: Dissertation
Full Text:: western Oregon. In 1993, I compared the spider communities of several host-tree species which have

Comparative study of the population dynamics, secondary productivity, and reproductive ecology of the euphausiids Euphausia pacifica and Thysanoessa spinifera in the Oregon upwelling region

Creator:: Gutierrez, Jaime Gomez
Abstract:: I compare the seasonal abundance variation, population dynamics, fecundity, egg hatching mechanism and success, and apostome ciliate parasites of the euphausiids Euphausia pac?fica and Thysanoessa spinfera from the Oregon coast, USA. Community structure and nearshore distributions were examined from bi-weekly oceanographic surveys (1970-1972). This region has a strong cross-shelf change...
Resource Type:: Dissertation
Full Text:: : Comparative Study of the Population Dynamics, Secondary Productivity, and Reproductive Ecology of the

Ecological aspects of the valley quail in the Madras area of central Oregon

Creator:: Yadon, Vernal Lee
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae)

An ecological reconnaissance of the artemisia steppe on the east central Owyee uplands of Oregon

The ecological consequences of the reduction of species diversity : experimental approaches

Coarse woody debris in streams of the Drift Creek Basin, Oregon

Livestock, deer and logging interactions in the lodgepole pine/pumice region of central Oregon

Correspondence of soil properties and classification units with sagebrush communities in southeastern Oregon

Effect of western juniper on understory herbage production in Central Oregon

Abundance and community composition of arboreal spiders : the relative importance of habitat structure, prey availability and competition

Comparative study of the population dynamics, secondary productivity, and reproductive ecology of the euphausiids Euphausia pacifica and Thysanoessa spinifera in the Oregon upwelling region

Ecological aspects of the valley quail in the Madras area of central Oregon

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