Index Catalog // ScholarsArchive@OSU

Environmental impacts on native bumble bee pollinators in an agricultural landscape of western Oregon

Creator:: Skyrm, Kimberly M.
Abstract:: Bumble bees provide vital pollination services in both native and agricultural landscapes. However, in recent years, bumble bee populations have experienced global population declines. The primary causes of these declines have been attributed to the environmental impacts of pathogens, pesticide use and habitat fragmentation. While research has examined the impacts...
Resource Type:: Dissertation
Full Text:: Native Bumble Bee Pollinators in an Agricultural Landscape of Western Oregon. Abstract approved

Natural enemies of native bumble bees (Hymenoptera: Apidae) in western Oregon

Creator:: Maxfield-Taylor, Sarah A.
Abstract:: Bumble bees (Hymenoptera: Apidae) are important native pollinators in wild and agricultural systems, and are one of the few groups of native bees commercially bred for use in the pollination of a range of crops. In recent years, declines in bumble bees have been reported globally. One factor implicated in...
Resource Type:: Masters Thesis
Full Text:: March 26, 2014. Title: Natural Enemies of Native Bumble Bees (Hymenoptera: Apidae) in Western Oregon

Using stable isotopes and visual gut examination to determine the diet composition of Pterostichus melanarius (Coleoptera: Carabidae) in western Oregon vegetable row crops

Creator:: Moulton, Laurel A.
Abstract:: The omnivorous ground beetle, Pterostichus melanarius Illager (Coleoptera: Carabidae), is a ubiquitous inhabitant of western Oregon crop land. Because it is often the most abundant ground beetle, and attains densities that could lead to serious impacts on its prey sources, I sought to understand the overall diet composition, and specifically...
Resource Type:: Masters Thesis
Full Text:: : Carabidae) in Western Oregon Vegetable Row Crops Abstract approved

Bees Associated with Linden (Tilia spp.) Trees and their Susceptibility to Toxic Sugars in Nectar

Creator:: Argoti, Adriana G.
Abstract:: Bees provide critical pollination services to diverse agricultural crops, native plants and trees. Globally, there are reports of bee declines which have been attributed to diseases, exposure to pesticides and changes in land use that are believed to have led to a reduction in foraging resources and nesting habitats for...
Resource Type:: Masters Thesis
Full Text:: . Occasionally dead bumble bees have been observed under linden trees in western Oregon in the west

Viability of seeds from squirrel-cut Douglas fir cones

Creator:: Lavender, Denis P. and Engstrom, W. H.
Abstract:: To determine if squirrels (Sciurus douglasii var.) cut cones before the seeds are ripe, a series of collection points was established in the Willamette Valley and the Cascade Mountains in the summer of 1954. The areas were inspected at intervals during August, September and October of 1954, and freshly cut...
Resource Type:: Technical Report
Full Text:: Dwight L. Phipps, State Forester Dick Berry, Research Director Salem, Oregon ' li6& 27 VIABILITY of

Seasonal variability in diet and consumption by cottid and salmonid fishes in headwater streams in western Oregon, USA

Creator:: Raggon, Mark F.
Abstract:: Coastal cutthroat trout (Oncorhynchus clarkii clarkii) and cottids (Cottus spp) commonly co-occur in headwater streams in western Oregon. Little is known about the comparative trophic ecology of these species or how they respond to seasonal scarcity of resources. In this study I evaluated the seasonal variability in diets and consumption...
Resource Type:: Masters Thesis
Full Text:: Headwater Streams in Western Oregon, USA Abstract approved: Jason B. Dunham

Competitive interactions and resource partitioning between northern spotted owls and barred owls in western Oregon

Creator:: Wiens, J. David
Abstract:: The federally threatened northern spotted owl (Strix occidentalis caurina) is the focus of intensive conservation efforts that have led to much forested land being reserved as habitat for the owl and associated wildlife species throughout the Pacific Northwest of the United States. Recently, however, a relatively new threat to spotted...
Resource Type:: Dissertation
Full Text:: Barred Owls in Western Oregon Abstract approved

The use of ơ15N and ơ¹³C to analyze food webs and identify source-sink relationships in riparian canopy vegetation of the Oregon Coast Range

Creator:: Scott, Emily E.
Abstract:: In the Coast Range of western Oregon, some natural resource managers are converting red alder-dominated riparian areas to conifers to increase the future source of in-stream large wood for salmonid habitat. However, studies in Alaska have shown red alder-dominated riparian areas support greater invertebrate biomass compared to conifer-dominated areas. In...
Resource Type:: Masters Thesis

Response of small mammal mycophagy to varying levels and patterns of green-tree retention in mature forests of western Oregon and Washington

Creator:: Jacobs, Katherine M.
Abstract:: The Demonstration of Ecosystem Management Options (DEMO) study is a large-scale, multi-year, interdisciplinary project examining the effects of various levels and patterns of green-tree retention on multiple forest features. Six retention levels and patterns were examined and replicated across six blocks of predominately Douglas-fir forested land in western Oregon and...
Resource Type:: Masters Thesis
Full Text:: land in western Oregon and Washington. As part of the DEMO study, this research focuses on the

Conservation genetics of Kincaid's lupine : a threatened plant of western Oregon and southwest Washington grasslands

Creator:: Severns, Paul M.
Abstract:: Kincaid's lupine (Lupinus oreganus Heller) is a federally listed threatened species native to remnant grassland of western Oregon and southwestern Washington, and is the primary larval host plant of a once thought extinct butterfly, Plebejus icarioides fenderi Macy. Past studies concerning Kincaid's lupine reproduction suggested that populations may suffer reductions...
Resource Type:: Dissertation
Full Text:: : Conservation Genetics of Kincaid’s Lupine: A Threatened Plant of Western Oregon and Southwest Washington

ScholarsArchive@OSU

Environmental impacts on native bumble bee pollinators in an agricultural landscape of western Oregon

Natural enemies of native bumble bees (Hymenoptera: Apidae) in western Oregon

Using stable isotopes and visual gut examination to determine the diet composition of Pterostichus melanarius (Coleoptera: Carabidae) in western Oregon vegetable row crops

Bees Associated with Linden (Tilia spp.) Trees and their Susceptibility to Toxic Sugars in Nectar

Viability of seeds from squirrel-cut Douglas fir cones

Seasonal variability in diet and consumption by cottid and salmonid fishes in headwater streams in western Oregon, USA

Competitive interactions and resource partitioning between northern spotted owls and barred owls in western Oregon

The use of ơ15N and ơ¹³C to analyze food webs and identify source-sink relationships in riparian canopy vegetation of the Oregon Coast Range

Response of small mammal mycophagy to varying levels and patterns of green-tree retention in mature forests of western Oregon and Washington

Conservation genetics of Kincaid's lupine : a threatened plant of western Oregon and southwest Washington grasslands

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