Index Catalog // ScholarsArchive@OSU

Accuracy and suitability of selected sampling methods within conifer dominated riparian zones

Creator:: Marquardt, Theresa, Temesgen, Hailemariam, and Anderson, Paul D.
Abstract:: Sixteen sampling alternatives were examined for their performance to quantify selected attributes of overstory conifers in riparian areas of western Oregon. Each alternative was examined at eight headwater forest locations based on a 0.52 ha square stem maps. The alternatives were evaluated for selected stand attributes (trees per hectare, basal...
Resource Type:: Article
Full Text:: - ides information about sources of spatial variationwithin riparian ones. Some sampling methods mainly

Thinning of young Douglas-fir forests decreases density of northern flying squirrels in the Oregon Cascades

Creator:: Manning, Tom, Hagar, Joan C., and McComb, Brenda C.
Abstract:: Large-scale commercial thinning of young forests in the Pacific Northwest is currently promoted on public lands to accelerate the development of late-seral forest structure for the benefit of wildlife species such as northern spotted owls (Strix occidentalis caurina) and their prey, including the northern flying squirrel (Glaucomys sabrinus). Attempts to...
Resource Type:: Article
Full Text:: squirrel populations, though 2 studies found no short-term effect of thinning 75 (Ransome and Sullivan

Bayesian models describing microhabitat associations of infrequently captured small mammals sampled under a complex hierarchical design

Creator:: Lam, Tzeng Yih and Maguire, Douglas A.
Abstract:: Knowledge about the relationship between habitat structure and abundance of a target species facilitates biodiversity conservation in managed forests. However, modeling the relationship for infrequent small mammal species in silvicultural experiments introduces the challenge of excessive zero counts and complex hierarchical sampling. A common solution has been to ignore infrequent...
Resource Type:: Article
Full Text:: essential. This information can be gained from modeling 77 microhabitat association of targeted taxa. 78

Comparative hazard assessment for protected species in a fire-prone landscape

Creator:: Roloff, Gary J., Mealey, Stephen P., and Bailey, John D.
Abstract:: We conducted a comparative hazard assessment for 325,000 ha in a fire-prone area of southwest Oregon, USA. The landscape contains a variety of land ownerships, fire regimes, and management strategies. Our comparative hazard assessment evaluated the effects of two management strategies on crown fire potential and northern spotted owl (Strix...
Resource Type:: Article
Full Text:: (Strix occidentalis caurina) conservation: 1) no action, and 2) active manipulation of 20 hazardous

Effects of ungulate herbivory on aspen, cottonwood, and willow development under forest fuels treatment regimes

Creator:: Endress, Bryan A., Wisdom, Michael J., Vavra, Martin, Parks, Catherine G., Dick, Brian L., Naylor, Bridgett J., and Boyd, Jennifer M.
Abstract:: Herbivory by domestic and wild ungulates can dramatically affect vegetation structure, composition and dynamics in nearly every terrestrial ecosystem of the world. These effects are of particular concern in forests of western North America, where intensive herbivory by native and domestic ungulates has the potential to substantially reduce or eliminate...
Resource Type:: Article
Full Text:: , and willow species to these treatments (N = 3) versus areas of no treatment (N = 3), and to exclusion

Canopy gaps affect long-term patterns of tree growth and mortality in mature and old-growth forests in the Pacific Northwest

Creator:: Gray, Andrew N., Spies, Thomas A., and Pabst, Robert J.
Abstract:: Canopy gaps created by tree mortality can affect the speed and trajectory of vegetation growth, species’ population dynamics, and spatial heterogeneity in mature forests. Most studies focus on plant development within gaps, yet gaps also affect the mortality and growth of surrounding trees, which influence shading and root encroachment into...
Resource Type:: Article
Full Text:: . There was no difference between mortality rates of trees within 8 m of gaps and trees in closed-canopy

Evaluation of mixed-effects models for predicting Douglas-fir mortality

Creator:: Groom, Jeremiah D., Hann, David W., and Temesgen, Hailemariam
Abstract:: We examined the performance of several generalized linear fixed- and mixed-effects individual-tree mortality models for Douglas-fir stands in the Pacific Northwest. The mixed-effects models accounted for sampling and study design overdispersion. Inclusion of a random intercept term reduced model bias by 88% relative to the fixed-effects model; however, model discrimination...
Resource Type:: Article
Full Text:: -effects models conditional on the 95 availability of previous information on the subject; however, in

Effects of bison on willow and cottonwood in northern Yellowstone National Park

Creator:: Painter, Luke E. and Ripple, William J.
Abstract:: On the northern ungulate winter range of Yellowstone Park, willow (Salix spp.) and cottonwood (Populus angustifolia and P. balsamifera) have increased in height and cover in some places since the reintroduction of wolves (Canis lupus) and the subsequent changes in elk (Cervus elaphus) behavior and population densities. However, in the...
Resource Type:: Article
Full Text:: to grow taller 295 once pressure from elk was reduced. 296 There was no evidence of elk in the

Influence of Bravo fungicide applications on wood density and moisture content of Swiss needle cast affected Douglas-fir trees

Creator:: Johnson, G. R., Gartner, Barbara L., Maguire, Doug, and Kanaskied, Alan
Abstract:: Wood density, moisture content, tracheid width and cell wall size were examined in trees from plots that were sprayed for 5 years with chlorothalonil (Bravo®) fungicide to reduce the impact of Swiss needle cast (SNC) and from trees in adjacent unsprayed plots. The unsprayed (more heavily diseased) trees had significantly...
Resource Type:: Article
Full Text:: Coumoyer, 1995; Krause and Morin, 1995). Information on the effects of SNC on FORECO 6400 I-I0 36

Resilience in Quaking Aspen: Recent advances and future needs

Creator:: Rogers, Paul C., Eisenberg, Cristina, and St. Clair, Samuel B.
Abstract:: Quaking aspen (Populus tremuloides) sustainability is a topic of intense interest in forest ecology. Reports range from declines to persisting or increasing coverage in some areas. Moreover, there is little agreement on ultimate factors driving changes. Low aspen recruitment has been attributed to climate patterns, past management, herbivore increases, competitive...
Resource Type:: Article
Full Text:: context provides a critical piece of information in evaluating aspen resilience and its 202 relationship

ScholarsArchive@OSU

Accuracy and suitability of selected sampling methods within conifer dominated riparian zones

Thinning of young Douglas-fir forests decreases density of northern flying squirrels in the Oregon Cascades

Bayesian models describing microhabitat associations of infrequently captured small mammals sampled under a complex hierarchical design

Comparative hazard assessment for protected species in a fire-prone landscape

Effects of ungulate herbivory on aspen, cottonwood, and willow development under forest fuels treatment regimes

Canopy gaps affect long-term patterns of tree growth and mortality in mature and old-growth forests in the Pacific Northwest

Evaluation of mixed-effects models for predicting Douglas-fir mortality

Effects of bison on willow and cottonwood in northern Yellowstone National Park

Influence of Bravo fungicide applications on wood density and moisture content of Swiss needle cast affected Douglas-fir trees

Resilience in Quaking Aspen: Recent advances and future needs

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