Treesearch

Research information needs on selected invertebrates and all vertebrates of the interior Columbia River basin and adjacent areas in the United States were collected into a research, development, and application database as part of the Interior Columbia Basin Ecosystem Management Project. The database includes 482 potential research study topics on 232 individual species and 18 species groups of animals, representing significant gaps in scientific knowledge. Research study topics in the database can be retrieved by use of keyword searches. Keyword subjects include basic ecology, distribution...

This publication provides qualitative and quantitative information on five distinct structures: living trees with decayed parts, trees with hollow chambers, trees with brooms, dead trees, and logs. Information is provided on the value of these structures to wildlife, the decay or infection processes involved in the formation of these structures, and the principles to consider for selecting the best structures to retain.

Silvicultural prescriptions to enhance northern flying squirrel (Glaucoinys sabrinus) habitat have been suggested as an aid for recovery of the threatened northern spotted owl (Strix occidentalis caurina). Flying squirrels are hypothesized to be limited by den sites (cavities in trees) and by food (truffles). However, no quantitative information exists on den sites of flying squirrels. Therefore, during 1986-94, we used radiotelemetry to locate 604 different den sites in the southern Coast Range of Oregon, the southern Olympic Peninsula, and the Puget Trough of Washington. Den sites...

In the Pacific Northwest, the northern flying squirrel, Glaucomys sabrinus, sumes sporocarps of a wide variety of hypogeous mycorrhizal fungi(truffles). Numerous other foods are also consumed but are not well characterized by fecal pellet analysis either because they are more fully digested (seeds, nuts, fruits, vegetation) or because of the similarity among spore types (lichen photobionts, epigeous fungi). Thus, observations of squirrel foraging are important in characterizing non-truffle dietary components. As part of a trapping and telemetry study, we observed G. sabrinus foraging on 63...

Two methods of analyzing the dietaries of mycophagous small mammals were compared. Fecal pellets were collected from 11 northern flying squirrels and 12 Townsend's chipmunks, all caught live. In 1 method, pellets from each individual were examined microscopically; in the other, samples from 3 or 4 individuals from each species were pooled and the number of slides and the fields of view used for each slide were reduced, resulting in less time and effort to collect data. Diet analysis by the two methods did not differ significantly for either mammal species.

Decisions regarding 72 million acres of Forest Service- and Bureau of Land Management- administered lands will be based on scientific findings brought forth in the Interior Columbia Basin Ecosystem Management Project. Some highlights of the scientific findings are presented here. Project scientists drew three general conclusions: (1) Conditions and trends differ widely across the landscape; as a result, one-size-fits-all strategies will neither effectively restore nor maintain ecosystems. (2) Ecosystem elements are linked to one another; effective ecosystem management requires an understand...

Preferences of executives, foresters, and biologists of the Pacific Northwest Research Station and executives, District Rangers, foresters, engineers, and biologists of the Pacific Northwest Region, National Forest System (USDA Forest Service), were compared for various thinking styles. Herrmann brain dominance profiles from 230 scientists and managers were drawn from Forest Service archives. Results showed that employees used diverse thinking styles; 24 different profiles were found and employees used 21 of 24 available adjectives to describe their own styles. All occupational groups...

Four Populus clones were grown at three spacings (0.5, 1.0, and 1.5 m) in monoclonal plots and in polyclonal plots with all clones in intimate mixture. After the third year, many individual tree and stand traits differed significantly by clone, spacing, deployment method, and their interactions. Differences among clones in growth and stem form were greater in polyclonal than in monoclonal plots, and differences in performance between deployment methods were greater in the denser spacings. Monoclonal stands had greater uniformity in tree size than polyclonal stands. Total aboveground...

Substrate respiration, mineralizable nitrogen, and nitrogen fixation rates, substrate moisture,content, and temperature were measured in trenched and undisturbed plots within two western Oregon Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) stands. The stands represent two different environments and ages. Woods Creek, the site of the lower elevation mature 70-year-old stand, is located in the Willamette Valley near Philomath, Oregon. The H.J. Andrews Forest, site of the higher elevation old-growth stand, lies on the western slopes of the Oregon Cascades. Mineralizable nitrogen rates...

Projections of Alaska timber products output, the derived demand for raw material, and timber harvest by owner are developed from a trend-based analysis. These projections are revisions of projections made in 1990 and again in 1994, and reflect the consequences of recent changes in the Alaska forest sector and long-term trends in markets for Alaska products. With the closure of the two southeast Alaska pulp mills, demand for Alaska National Forest timber now depends on markets for sawn wood and the ability to export manufacturing residues and lower grade logs. Three alternative projections...