Search
« Previous | 1 - 100 of 1,996 | Next »
Search Results
-
18 p. Term paper produced for HC 441: Science Colloquium: Willamette River Environmental Health, Robert D. Clark Honors College, University of Oregon , Spring term, 2004.
Citation -
4. [Article] Ground dwelling beetles in early and late successional forests in the western Cascades of Oregon
The effects of forest cutting on forested systems and the biotic components of those systems has been at the forefront of scientific research. The inventory and monitoring of biodiversity is one technique ...Citation -
5. [Article] Distribution and abundance of coastal fish and macro-invertebrates in the Galapagos Islands
The Galapagos Islands, located off the coast of Ecuador, have a spatially diverse marine environment suitable for a variety of species with different climatic requirements. A year-long inventory program ...Citation -
Invasion by non-native plants into natural areas is an important component of global change that threatens biodiversity and ecosystem structure and function. Mountains are currently among the least invaded ...
Citation -
7. [Article] Using Landsat TM Imagery to Monitor Vegetation Change Following Flow Restoration to the Lower Owens River, California
Rehabilitating river corridors to restore valuable riparian habitat consumes significant resources from both governments and private companies. Given these considerable expenditures, it is important to ...Citation -
8. [Article] Non-forest Plant Communities of the Northern Oregon Coast Range and Vicinity Draft Report
DRAFT REPORT. In 2013 – 2015, reconnaissance observations were made across non-forest habitats on FS and BLM land in the Coast Range and Cascade foothills within the Salem and Eugene BLM district areas ...Citation -
Birds perform valuable ecological functions and are useful environmental indicators. Avian distributions and diversity are predicted to change over the next 50 years. Little information exists on the role ...
Citation -
10. [Article] General management principles and a checklist of strategies to guide forest biodiversity conservation
Many indicators and criteria have been proposed to assess the sustainable management of forests but their scientific validity remains uncertain. Because the effects of forest disturbances (such as logging) ...Citation -
Ectomycorrhizal (ECM) fungi of the genera Piloderma and Ramaria form dense hyphal mats in the organic and upper mineral soil layers, respectively, in coniferous forest floors of the Pacific Northwest. ...
Citation -
Based on the evoked set analysis, a group of factors driving knowledge and preferences about fish farmed species are investigated with three different samples. Samples were collected in Spain, into a nationwide study ...
Citation -
13. [Article] Biodiversity in managed forests of western Oregon : species assemblages in leave islands, thinned, and unthinned forests
Both leave islands, or green tree retention clusters, and thinning prescriptions have been proposed as alternative silvicultural strategies designed to sustain the structural and biological diversity of ...Citation -
14. [Article] Forest associations and secondary plant succession in the southern Oregon coastal range
Forest associations, secondary succession, and relationships of plant communities to Roosevelt elk were investigated. Stratification of vegetation into ecological units and an understanding of secondary succession ...Citation -
15. [Article] Onshore-offshore variations in copepod community structure off the Oregon coast during the summer upwelling season
The published version of this article is copyrighted by Inter-Research and can be found here: http://www.int-res.com/journals/meps/meps-home/Citation -
This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by the Public Library of Science. The published article can be found at: http://www.plosone.org/.
Citation -
17. [Article] Bird-vegetation associations in thinned and unthinned young Douglas-fir forests 10 years after thinning
To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Elsevier ...Citation -
18. [Article] The Effects of Disturbance History on Ground-Layer Plant Community Composition in British Columbia
This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by MDPI. The published article can be found at: http://www.mdpi.com/journal/forestsCitation -
19. [Article] Oceanographic conditions around the Galápagos Archipelago and their influence on cetacean community structure
The objectives of this dissertation were to describe the complex oceanographic conditions around the Galápagos Archipelago (eastern equatorial Pacific), their seasonal variability, and their effects on ...Citation -
20. [Article] Distribution and assemblages of demersal fish in Oman
The Sultanate of Oman has 1700 km of coastline extending from the Arabian Gulf south to the Arabian Sea. The demersal fish distributions and assemblages have not previously been well defined. In winter, ...Citation -
21. [Article] The LizLand model : geomorphic landform and surface composition analysis of lizard habitat in the California Mojave Desert
This dissertation had three main objectives: 1) investigate the role of macro and micro geomorphology in determining lizard distributions in the Southern California Mojave Desert; 2) develop a spatially ...Citation -
22. [Article] Vegetation and soil microbial communities three years after wildfire in spruce-fir forests of northwestern Wyoming
The Normalized Burn Ratio and Composite Burn Index were used to classify burn severity in three sites that experienced lightning-ignited wildfire in the year 2000. The effect of burn severity (unburned, ...Citation -
A plant community classification was developed describing the comprehensive variation of oak vegetation currently occupying the Willamette Valley Ecoregion of western Oregon. Multivariate statistical analyses ...
Citation -
24. [Article] Estimating Watershed Biodiversity: An Empirical Study of the Chesapeake Bay in Maryland, USA
There has been increasing demand for rigorous methods for evaluating biodiversity, one of the ecosystem services that sustains and fulfills human life. After carefully examining the literature, we found ...Citation -
25. [Article] Mapping Conservation Opportunity Areas for the Intertwine's Regional Conservation Strategy
As part of efforts to develop the Regional Conservation Strategy (RCS) for the greater Portland-Vancouver region, Oregon State University’s Institute for Natural Resources (INR) was asked to use spatial ...Citation -
26. [Article] Integration methods for enzymatic analysis response curves which show maxima, minima or inflections
Integration methods for enzymatic reactions were applied to transducer response vs. time curves which exhibit maxima, minima or inflections. The difference between the integral of the time dependent response ...Citation -
27. [Article] Effects of disturbance modes on mycorrhizal fungus communities at Crater Lake National Park
Crater Lake National Park presents an excellent opportunity for ecological research due to its relatively pristine landscape, the protection of its natural features, its infrastructure, and a Park administration ...Citation -
28. [Article] Floodplain vegetation following over 80 years of intensive land use and de-watering : Lower Owens River, California.
Riparian areas in the arid western United States are critical ecosystems that have been severely degraded by a variety of land and water uses over the last 100 years. In this study, the composition and ...Citation -
Technical review / report
Citation -
30. [Article] Bird communities in 5- to 34- year old managed Douglas-fir stands on the Willamette National Forest, Oregon Cascades
Breeding bird communities were examined in 18 managed Douglas-fir stands in 6 age classes from 5 to 34 years old in spring and early summer, 1993 on the Detroit Ranger District, Willamette National Forest, ...Citation -
31. [Article] Non-Native Plant Invasion along Elevation and Canopy Closure Gradients in a Middle Rocky Mountain Ecosystem
To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The article was published by the Public Library ...Citation -
32. [Article] Spatiotemporal Drivers of Seabird Distribution at the Pacific Marine Energy Center off Newport, Oregon
The central Oregon coast was selected as an ideal site for wave energy development and establishment of the Pacific Marine Energy Center (PMEC). PMEC will consist of two nearshore sites, one north (NETS) ...Citation -
Groundfish surveys off the Washington coast were conducted in September of 1975 and 1976 between Cape Flattery and the Columbia River. The primary purposes of the surveys were to obtain estimates of biomass ...
Citation -
The purpose of this study was to develop a plant association classification for the mature coniferous forests of the McDonald and Paul M. Dunn Research Forests. A secondary objective was to quantify diversity ...
Citation -
The published version of this article is copyrighted by Inter-Research and can be found here: http://www.int-res.com/journals/meps/meps-home/
Citation -
36. [Article] Probabilistic modeling of understory vegetation species in a northeastern Oregon industrial forest
Managing forest ecosystems for sustainable, multiple use requires forest resource managers to understand how species composition and distribution vary across environmental gradients and respond to landscape ...Citation -
The purpose of this study was to: (1) evaluate land use and vegetation history of the Willamette Floodplain Research Natural Area; (2) characterize present day vegetation; (3) evaluate the relation of ...
Citation -
38. [Article] Zooplankton of the Galapagos Islands
The marine climate of the Galapagos is spatially and seasonally heterogeneous. A taxonomically comprehensive study of Galapagos zooplankton has never been done. This study is an initial effort to establish ...Citation -
39. [Article] Small mammal distribution, abundance and habitat selection in managed riparian habitats of Bear Valley, eastern Oregon
Riparian zones are critical habitats for management because of their importance for both cattle production and wildlife, and a high potential for resource conflicts. Riparian management should address ...Citation -
I investigated the population dynamics of fireweed (Epilobium angustfolium), foxglove (Digitalis purpurea) , and woodland groundsel (Senecio sylvaticus) to understand their colonization, persistence, and ...
Citation -
41. [Article] Statistical foraminiferal ecology from seasonal samples, central Oregon continental shelf
This study examined the foraminifera and the ecologic conditions of the benthic environment of the Oregon shelf and the uppermost slope (75-550 m depth) between 143°45' N and 144°40' N. Seasonal collections monitored ...Citation -
42. [Article] Realized and potential climate responses of lichen and bryophyte communities in a national forest inventory
Climate and terrestrial vegetation have had mutual feedbacks for nearly five hundred million years, yet both are now departing from recent historical norms, with uncertain implications for forest ecosystems. ...Citation -
Chemical contaminants can be introduced into estuarine and marine ecosystems from a variety of sources including wastewater, agriculture and forestry practices, point and non-point discharges, runoff from ...
Citation -
44. [Article] Distribution, structure, and function of marine ecological communities in the northern California Current upwelling ecosystem
Within systems characterized by substantial spatial and temporal variability, abundances of organisms tend to be higher in localized areas. Within the northern California Current system, the identification ...Citation -
45. [Article] Evaluating benthic macroinvertebrates as bio-indicators of freshwater habitat quality in an eastern Oregon agro-ecosystem
The effect of anthropogenic disturbance on river systems is gaining attention, and concerns about the state of freshwater natural resources are increasing globally, as are efforts to restore habitat that ...Citation -
46. [Article] How Much Groundwater does a Wetland Need? Setting Ecological Water Requirements for Groundwater-Dependent Ecosystems
Presented at The Oregon Water Conference, May 24-25, 2011, Corvallis, OR.Citation -
Recent studies of headwater streams have demonstrated their importance to overall watershed biodiversity, nutrient cycling, and energy flux. However, little attention has been paid to long-term effects ...
Citation -
48. [Article] The effect of broadcast burning on the quality of winter forage for elk, westen Oregon
The Roosevelt elk (Cervus elephus roosevelti) is a National Forest management indicator species on the westside of the Cascade mountains, Western Oregon. A Habitat Effectiveness model is used by State ...Citation -
Field studies were started at Hyslop Farm, Corvallis, Oregon in 1984 to determine the soil persistence of the herbicide clopyralid (3,6-dichloropicolinic acid) under cropping situations. The herbicide ...
Citation -
50. [Article] The land-water interface : patterns of riparian vegetation and channel morphology in the Oregon Coast Range system
This study was conducted to describe variation of riparian vegetation in an Oregon Coast Range system according to geomorphic characteristics and in relation to streamflow. Specific objectives of this ...Citation -
Home range and habitat use by pileated woodpeckers (Dryocopus pileatus) were studied in the Coast Ranges of western Oregon. Radio-telemetry was used to determine home ranges of 11 woodpeckers and habitat ...
Citation -
52. [Article] Summer-time use of west coast US National Marine Sanctuaries by migrating sooty shearwaters (Puffinus griseus)
To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Elsevier ...Citation -
An estimated 99% of native wet prairie has been lost in the Willamette Valley, Oregon, but a large number of seasonal wetlands remain on private lands dedicated to grass seed production within the historical ...
Citation -
55. [Article] Mapping conservation opportunity areas for the Intertwine's Regional Conservation Strategy
Draft report from the Institute for Natural Resources, Portland State UniversityCitation -
Adaptive ecosystem management is a new paradigm for managing federal forests which requires regular monitoring of ecosystem function and diversity to measure the effects of management. Managers need new ...
Citation -
57. [Article] Comparing vegetation and soils of remnant and restored prairie wetlands in the northern Willamette Valley
Native prairies of the Willamette Valley are considered among the rarest of Oregon's ecosystems (Clark and Wilson, 2001). As a result of agriculture conversion, urban development and cessation of native ...Citation -
58. [Article] Using Oregon trawl logbooks to study spatial and temporal characteristics of commercial groundfish species associations
Species associations of fifteen major commercial groundfish species in the northeastern Pacific ocean and their spatial and temporal characteristics were studied using Oregon bottom trawl logbook data, ...Citation -
The specific identification of a megalurous cercaria found in the snail Oxytrema plicifera was accomplished by completing the life cycle in the laboratory. This species is compared with the eastern Philophthalmus ...
Citation -
We have a poor understanding of the biotic communities in zero-order basins, drainages extending from ridgelines to the initiation of first-order streams. This study describes baseline plant and amphibian ...
Citation -
61. [Article] Comparative Characterization of Two Nearshore Rocky Reef Areas: A high-use recreational fishing reef vs. an unfished reef
This project has provided the ODFW Marine Habitat Project with a unique opportunity to make a comparative examination of the habitats and fish communities of a heavily fished reef off of Siletz Bay, and ...Citation -
62. [Article] Woody riparian species patterns along northeast Oregon mountainous streams and the relationship to riparian capability
Woody riparian vegetation is an essential component of riparian ecosystems, responsible in part for the maintenance of functional ecological processes. The plant community composition and distribution ...Citation -
This study focuses on the tradeoffs that exist for managing forested landscapes for biodiversity and timber production. Tradeoff evaluation is important to natural resource managers so they can understand ...
Citation -
64. [Article] Hydrologic and vegetation responses associated with restoration of wetlands in the Willamette Valley, Oregon
I examined hydrological and plant community changes associated with the implementation of a restoration management plan in two riparian meadows located within an agricultural landscape of the central Willamette ...Citation -
65. [Article] Ecology and biological control of an apomictic invasive plant, Chondrilla juncea (Asteraceae)
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 ...Citation -
66. [Article] Trophic dynamics of marine nekton and zooplankton in the Northern California Current ecosystem
The Northern California Current (NCC) ecosystem exhibits extreme seasonal, interannual and interdecadal shifts in the abiotic environment and shifts in primary and higher production. This variability is ...Citation -
67. [Article] Reconnaissance botany of alpine ecosystems on Prince of Wales Island, southeast Alaska
A study of the Prince of Wales Island alpine areas was undertaken to determine what species occur in the region and to describe plant communities making up the alpine vegetation. For one month in 1972, ...Citation -
The Oregon continental shelf waters are typically characterized by four to five major upwelling events that occur between May and October. The upwelled water is rich in nutrients, which fuels an increase ...
Citation -
69. [Article] Lidar-derived canopy architecture predicts brown creeper occupancy of two western coniferous forests
This is the publisher’s final pdf. The published article is copyrighted by The Cooper Ornithological Society and can be found at: http://www.cooper.org/.Citation -
70. [Article] Species associations and redundancy in relation to biological hotspots within the northern California Current ecosystem
To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Elsevier ...Citation -
71. [Article] Effects of pesticides on amphibians with special reference to the pyrethroid insecticide, cypermethrin
Pollution by pesticides is a ubiquitous concern for wildlife. The effects of pesticides are especially concerning in aquatic environments, which are particularly vulnerable as they have several exposure ...Citation -
Some of the most pressing conservation concerns involve declining populations of species with low fecundity and highly specialized foraging and reproductive requirements. Yet, we often lack a functional ...
Citation -
Suggested Bibliographic Reference: Challenging New Frontiers in the Global Seafood Sector: Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, ...
Citation -
74. [Article] Geographic variation in Dunn's salamander Plethodon dunni Bishop (Amphibia:Caudata:Plethodontidae)
Life history attributes and apparent distributional patterns suggest that Plethodon dunni exists as small, semi-isolated populations throughout its range. Isozyme and morphological variation in this species ...Citation -
75. [Article] Age, growth and maturity of the longnose skate (Raja rhina) for the U.S. west coast and sensitivity to fishing impacts
In the past, sharks, skates and ray species have mainly occurred in incidental fisheries. Now they are increasingly being directly targeted due to the depleted status of traditionally targeted species. ...Citation -
76. [Article] The morphology and taxonomic significance of the male genitalia of Coenonycha (Coleoptera, Scarabaeidae)
The genus Coenonycha contains 30 described species of small to medium sized scarabs. They are found in the arid and semi-arid regions of western United States and northern Baja California. The adults feed ...Citation -
77. [Article] Behavior of Nine Species of Pacific Rockfish after Hook-and-Line Capture, Recompression, and Release
We evaluated the effect of barotrauma on the behavior of nine species of Pacific rockfish Sebastes spp. after hook-and-line capture and release using a video-equipped underwater release cage. Sampling ...Citation -
78. [Article] Pathogenicity and Virulence of Pythium Species Obtained from Forest Nursery Soils on Douglas-Fir Seedlings
To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by [publisher] ...Citation -
79. [Article] Resveratrol Influence on Lifespan among Caenorhabditis Elegans Genetic Variants & Implications for Personalized Medicine
46 pages. A thesis presented to the Department of Human Physiology and the Clark Honors College of the University of Oregon in partial fulfillment of the requirements for degree of Bachelor of Science, ...Citation -
Invasion by exotic species can pose a major challenge for developing native plant communities in wetland restoration projects. Often native plant communities do not develop as anticipated in restored wetlands ...
Citation -
Three studies were conducted to characterize and present early-seral competition between Douglas-fir seedlings and the surrounding vegetation communities during Pacific Northwest forest establishment. ...
Citation -
82. [Article] Release of dissolved organic matter by coastal diatoms
Dissolved organic matter (DOM) production was examined in axenic batch cultures of five coastal diatom species. For Chaetoceros decipiens, dissolved organic carbon (DOC) accumulated beginning in late exponential growth ...Citation -
83. [Article] Feeding ecology of juvenile rockfishes off Oregon and Washington based on stomach content and stable isotope analyses
To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Springer ...Citation -
84. [Article] Colonization and extinction in dynamic habitats: an occupancy approach for a Great Plains stream fish assemblage
To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. This is the publisher’s final pdf. The published article is copyrighted by Ecological ...Citation -
85. [Article] Physiological alterations following severe hypoxic stress in two species of fresh-water fish
Bluegill sunfish, Lepomia macrochirus, and cutthroat trout, Salmo clarki, were exposed to a rapidly declining oxygen tension for a period of time sufficient to just cause loss of equilibrium in the fish. ...Citation -
86. [Article] Social interaction between juvenile coho and fall chinook salmon in Sixes River, Oregon
The nature of the interaction between juvenile coho salmon, Oncorhynchus kisutch (Walbaum), and fall chinook salmon, 0. tshawytscha (Walbaum), was studied in Sixes River, Oregon. Seining, snorkeling, and ...Citation -
87. [Article] Community gradients of Arctic macrolichens in relation to succession, grazing and the environment
The purpose of this dissertation was to define macrolichen community gradients in relation to succession, grazing and the environment. First, species scores indicating when macrolichen species appeared ...Citation -
88. [Article] Lichen communities and species indicate climate thresholds in southeast and south-central Alaska, USA
This is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by The American Bryological and Lichenological Society, Inc., and can be found at: ...Citation -
89. [Article] Growth rates and species composition of juvenile rockfish (Sebastes spp.) in Oregon’s nearshore and estuarine habitats
Identification of critical habitat for all life stages of commercially exploited fish populations is critical for effective management. Despite a clear need for basic biological information on juvenile ...Citation -
Investigations into the phylogeny, genome size, and karyotype of microsporidian Nadeispora canceri were initiated to further characterize the organism. Isolates of N. canceri spores were obtained from ...
Citation -
American pikas (Ochotona princeps) are considered an indicator species of climate change. Adaptations for cold climates and active winters make pikas particularly sensitive to increasing temperatures. ...
Citation -
92. [Article] Population genetics, systematics, and habitat associations of chanterelles in the Pacific Northwest
Balancing resource extraction with protection of Pacific Northwest forest ecosystems requires understanding the population biology of ectomycorrhizal fungi. Design of landscape-scale management and research ...Citation -
The definitive version of this article is available at www.newphytologist.com.
Citation -
The application of lucigenin chemiluminescence for the determination of trace concentrations of Co(II) is described. This method is based on the enhancing effect that Co(II) has on the reaction of lucigenin ...
Citation -
95. [Article] Searching for viable exploitation within small scale fisheries; the case of Solomon Islands
Abstract OnlyCitation -
96. [Article] Searching for viable exploitation within small scale fisheries; the case of Solomon Islands
Abstract onlyCitation -
97. [Article] Benthic macroinvertebrates and sediment characteristics of a coastal dune margin lake (Carter Lake, Douglas County, Oregon)
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, ...Citation -
The canyon grasslands of the Hells Canyon National Recreation Area (HCNRA) are a unique ecosystem within the Pacific Northwest Bunchgrass Region (PNWBR) with a long history of natural and anthropogenic ...
Citation -
99. [Article] Early competitive environments differentially influence stress axis responses in sympatric, ecologically similar songbirds
1. Early competitive environments can shape the development of offspring across taxa. For example, competition for food can have downstream effects on offspring phenotypes and fitness; however, little ...Citation -
Aspects of the limnology and benthic ecology of Upper Klamath Lake, Oregon, are described emphasizing those features that identify its uniqueness. The lake is large, shallow, and characterized by nuisance ...
Citation