Index Catalog // ScholarsArchive@OSU

Functional relationships among songbirds, arthropods, and understory vegetation in Douglas-fir forests, western Oregon

Creator:: Hagar, Joan C.
Abstract:: Arthropods are important food resources for birds. Forest management activities can influence shrub-dwelling arthropods by affecting the structure and composition of understory shrub communities. Changes in abundance and species composition of arthropod communities in turn may influence the distribution and abundance of insectivorous birds. I examined relationships among bird abundance,...
Resource Type:: Dissertation

Direct and indirect effects of livestock grazing intensity on processes regulating grassland bird populations

Creator:: Johnson, Tracey N.
Abstract:: In grasslands, grazing by large ungulates can influence vegetation structure, composition, primary productivity, and ultimately, ecosystem functioning. While grazing represents a complex disturbance, grazing intensity largely determines the effects of grazing on vegetation. Structural and compositional changes in the plant community caused by grazing could have bottom-up effects on species...
Resource Type:: Dissertation
Full Text:: SIX SPECIES OF GRASSLAND SONGBIRD BREEDING AT THE ZUMWALT PRAIRIE PRESERVE IN NORTHEASTERN OREGON

Validating songbird habitat relationship models

Creator:: Wilson, Dorothy G.
Abstract:: Models are commonly used to assess and predict wildlife response to management practices. Model validation is essential if managers are to use them with confidence. Fifteen forest bird-habitat relationship models were developed by biologists using data collected from private forestland in southwest Washington. These models predict species' probability of occurring...
Resource Type:: Masters Thesis
Full Text:: . Validating Songbird Habitat Relationship Models by Dorothy G. Wilson A THESIS submitted to Oregon State

Post-breeding habitat selection by songbirds in the headwaters of the Trask River, northwestern Oregon

Creator:: Jenkins, Stephanie R.
Abstract:: Little is known on the importance of riparian areas to birds near small headwater streams in mesic forests. Progress towards understanding limiting factors that affect bird populations has been difficult because of lack of information beyond the breeding period. I compared bird assemblages between headwater riparian and upland areas throughout...
Resource Type:: Masters Thesis
Full Text:: the Trask River, Northwestern Oregon Abstract approved: Matthew G. Betts Joan C. Hagar

Songbird communities in burned and logged stands with variable tree retention in the Canadian Rocky Mountains

Creator:: Stuart-Smith, A. Kari
Abstract:: By emulating natural disturbances such as wildfire, managers hope to maintain biodiversity in managed forests. Leaving residual (live) trees in harvested areas is key to this strategy. However, the effectiveness of this approach is unknown. I surveyed songbirds in 176 stands in the Rocky Mountains of southeastern British Columbia, Canada,...
Resource Type:: Dissertation

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

ScholarsArchive@OSU

Functional relationships among songbirds, arthropods, and understory vegetation in Douglas-fir forests, western Oregon

Direct and indirect effects of livestock grazing intensity on processes regulating grassland bird populations

Validating songbird habitat relationship models

Post-breeding habitat selection by songbirds in the headwaters of the Trask River, northwestern Oregon

Songbird communities in burned and logged stands with variable tree retention in the Canadian Rocky Mountains

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

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