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

Balancing Timber Production and Conservation in the Oregon Coast Range: an Examination of the Response by Birds and Bird-induced Ecosystem Services to Forest Management at Multiple Scales

Creator:: Harris, Scott H.
Abstract:: Society derives many critical and irreplaceable values from forests. With a growing global human population and rates of consumption, forests are under increasing pressure to provide all these values simultaneously. To meet societal demands for wood products, tree plantations are becoming increasingly common and are replacing native forests. Yet, forests...
Resource Type:: Dissertation
Full Text:: and generous with their time and advice: Joan Hagar, Tom Spies, John Sessions, and Bruce McCune

Evaluating Multi-objective Trade-offs in Mature Douglas-fir (Pseudotsuga menziesii) Stands of Western Oregon

Creator:: Williams, Neil G.
Abstract:: Contemporary forest management involves a more extensive and diverse suite of management objectives than was the case throughout much of the Twentieth Century. Heightened public and political awareness of local and global biodiversity decline, and interest in arresting these trends, has increased the emphasis on broad-based biodiversity conservation as an...
Resource Type:: Dissertation
Full Text:: , Joan Hagar, Dave Shaw, and Chris Still, for their thoughtful advice and assistance throughout this

Tradeoffs and Synergies among Wild Ungulates, Early Successional Plant Communities and Management Intensification in Forest Plantations of the Oregon Coast Range

Creator:: Stokely, Thomas D.
Abstract:: As the global demand for natural resources increases, more land will be intensively managed for the production of commodities such as timber, with potential consequences to biodiversity, ecological functioning and ecosystem services provided to society. Although there is strong consensus that intensive land management practices can negatively affect biodiversity, less...
Resource Type:: Dissertation
Full Text:: professor, Matthew G. Betts. Many debts of gratitude to my committee members, Joan Hagar, Dave

The use of burned forest by breeding birds following the Biscuit Fire in southwest Oregon

Creator:: Donaghy Cannon, Michelle M.
Abstract:: Fire severity is hypothesized as an important driver of bird responses to wildfire. For those species that typically respond negatively to increasing severity, Accessibility of high-severity burned forest may be dependent on the proximity of unburned or low-severity burned forest to meet all of the needs of breeding bird species...
Resource Type:: Dissertation
Full Text:: way. My committee members, Joan Hagar, David Hibbs and Doug Robinson offered different and much

Trophic cascades and large mammals in the Yellowstone ecosystem

Creator:: Painter, Luke E.
Abstract:: Reintroduction of wolves to Yellowstone National Park (YNP) in 1995-96 provided a rare opportunity to observe the response of an ecosystem to the return of a top predator, including possible reversal of decades of decline of aspen, cottonwood, and tall willows suppressed by intensive herbivory on elk winter ranges. To...
Resource Type:: Dissertation
Full Text:: support of my committee members, Paul Doescher, Joan Hagar, Anita Morzillo, and Kate Lajtha. Eric

Shrub epiphyte communities in relation to stand management in forests of western Oregon

Creator:: Rosso, Abbey L.
Abstract:: This dissertation describes the epiphyte communities on tall shrubs in forests of western Oregon, with a focus on potential effects of management practices on these communities. Shrubs and other hardwoods have recently gained recognition as hotspots of diversity for epiphytes in young conifer forests of the region. Yet little is...
Resource Type:: Dissertation
Full Text:: Peck, Chiska Derr, Roger Rosentreter, Rebecca Hess, Joan Hagar, Martin Hutten, Ken West, Nina Zerba

An examination of climate and land-use change as drivers of population dynamics in breeding birds

Creator:: Kim, Hankyu
Abstract:: Anthropogenic land-cover change and climate change are the major drivers of the steep loss of avian biodiversity in past decades. Loss of avian biodiversity is predicted to result in the reduction of ecosystem services and ecological functions. Identifying avian population changes and the drivers of these trajectories is essential for...
Resource Type:: Dissertation
Full Text:: conservation in this challenging world. Joan Hagar, Rodney Siegel, Jaime Stephens, Peter and Pam Hayes, Brett

Relationships between forest-floor invertebrate distribution, movement, and microclimate under alternative riparian management practices

Creator:: Rykken, Jessica J.
Abstract:: Headwater streams and their riparian zones are a common, yet poorly understood, component of Pacific Northwest landscapes. I sought to describe the ecological significance of headwater stream riparian zones as habitat for forest-floor invertebrate communities, and to assess how alternative management strategies for riparian zones may impact these communities. I...
Resource Type:: Dissertation
Full Text:: while sorting through untold stacks of pitfall contents in the lab. Joan Hagar, Sid, Lava, Chilko

Are Bird Habitat Associations Consistent Across Space and Time?

Creator:: Rousseau, Josée S.
Abstract:: The concept of the fundamental niche is frequently used in ecology to define the set of environmental conditions needed by a species to survive and reproduce (Hutchinson 1957). In contrast, the realized niche constitutes the locations where a species actually occurred, which is a function of both the environmental (abiotic)...
Resource Type:: Dissertation
Full Text:: , Misty Magers, Michelle Green, and Troy Hall. A huge thank you to Joan Hagar for being present and

ScholarsArchive@OSU

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

Balancing Timber Production and Conservation in the Oregon Coast Range: an Examination of the Response by Birds and Bird-induced Ecosystem Services to Forest Management at Multiple Scales

Evaluating Multi-objective Trade-offs in Mature Douglas-fir (Pseudotsuga menziesii) Stands of Western Oregon

Tradeoffs and Synergies among Wild Ungulates, Early Successional Plant Communities and Management Intensification in Forest Plantations of the Oregon Coast Range

The use of burned forest by breeding birds following the Biscuit Fire in southwest Oregon

Trophic cascades and large mammals in the Yellowstone ecosystem

Shrub epiphyte communities in relation to stand management in forests of western Oregon

An examination of climate and land-use change as drivers of population dynamics in breeding birds

Relationships between forest-floor invertebrate distribution, movement, and microclimate under alternative riparian management practices

Are Bird Habitat Associations Consistent Across Space and Time?

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