Publications
Filter Total Items: 2073
A research problem analysis in support of the Cooperative Forest Ecosystem Research (CFER) Program A research problem analysis in support of the Cooperative Forest Ecosystem Research (CFER) Program
No abstract available.
Authors
Jeff P. Smith, Robert E. Gresswell, John P. Hayes
Rotifer abundance and distribution in the northern Cascade Mountains, Washington, USA Rotifer abundance and distribution in the northern Cascade Mountains, Washington, USA
No abstract available.
Authors
E. Deimling, W.J. Liss, G.L. Larson, R. Hoffman, G.A. Lomnicky
Population dynamics of the deer mouse (Peromyscus maniculatus) and Sin Nombre Virus, California Channel Islands Population dynamics of the deer mouse (Peromyscus maniculatus) and Sin Nombre Virus, California Channel Islands
Hantavirus pulmonary syndrome, first documented in 1993, is caused by Sin Nombre virus (SNV), which is carried by the Peromyscus species. In 1994, high SNV antibody prevalence was identified in deer mice from two California Channel Islands. We sampled two locations on three islands to estimate mouse population density and SNV prevalence. Population flux and SNV prevalence appear to vary
Authors
T. B. Graham, B.B. Chomel
Western Great Lakes biogeographic area summary report Western Great Lakes biogeographic area summary report
No abstract available.
Authors
K.L. Cole
Use of ungulates by Yellowstone grizzly bears Ursus arctos Use of ungulates by Yellowstone grizzly bears Ursus arctos
Previous results of fecal analysis from the Yellowstone area and the known abilities of grizzly bears Ursus arctos to acquire and digest tissue from vertebrates suggested that grizzlies in this ecosystem obtained substantial energy from ungulates. This issue was addressed using observations from radio-marked grizzly bears, 1977–1992. Ungulates potentially contributed the majority of...
Authors
D.J. Mattson
Wilderness-dependent wildlife: The large and carnivorous Wilderness-dependent wildlife: The large and carnivorous
Wilderness is vital to the conservation of wildlife species that are prone to conflict with humans and vulnerable to human-caused mortality. These species tend to be large and are often carnivorous. Such animals are typically problematic for humans because they kill livestock and, occasionally, humans, and cause inordinate damage to crops. The vulnerability of large herbivores and...
Authors
David J. Mattson
Clonal foraging in perennial wheatgrasses: A strategy for exploiting patchy soil nutrients Clonal foraging in perennial wheatgrasses: A strategy for exploiting patchy soil nutrients
1. Foraging by means of plasticity in placement of tillers in response to low- and high-nutrient patches was examined in the rhizomatous wheatgrass Elymus lanceolatus ssp. lanceolatus. Its ability to exploit soil nutrient patches was compared to that of the closely related but caespitose E. lanceolatus ssp. wawawaiensis. 2. Clones of 14 genets of each taxon were planted in boxes...
Authors
L. David Humphrey, David A. Pyke
Density, ages, and growth rates in old-growth and young-growth forests in coastal Oregon Density, ages, and growth rates in old-growth and young-growth forests in coastal Oregon
We studied the ages and diameter growth rates of trees in former Douglas-fir (Pseudotsuga menziesii (Mirb.)Franco) old-growth stands on 10 sites and compared them with young-growth stands (50-70 years old, regenerated after timber harvest) in the Coast Range of western Oregon. The diameters and diameter growth rates for the first 100 years of trees in the old-growth stands were...
Authors
J. C. Tappeiner, D. Huffman, T. Spies, John D. Bailey
Long-term limnological data from the larger lakes of Yellowstone National Park, Wyoming, USA Long-term limnological data from the larger lakes of Yellowstone National Park, Wyoming, USA
Long-term limnological data from the four largest lakes in Yellowstone National Park (Yellowstone, Lewis, Shoshone, Heart) are used to characterize their limnology and patterns of temporal and spatial variability. Heart Lake has distinctively high concentrations of dissolved materials, apparently reflecting high thermal inputs. Shoshone and Lewis lakes have the highest total SiO2...
Authors
E.C. Theriot, S.C. Fritz, Robert E. Gresswell
Using mark-recapture methods to estimate fish abundance in small mountain lakes Using mark-recapture methods to estimate fish abundance in small mountain lakes
The majority of lacustrine fish populations in the western USA are located far from the nearest road. Although mark-recapture techniques are widely accepted for estimating population abundance, these techniques have been broadly ignored for fisheries surveys in remote mountain lakes because of restricted access and associated logistical constraints. In this study, mark recapture...
Authors
Robert E. Gresswell, W.J. Liss, G.A. Lomnicky, E. Deimling, Robert L. Hoffman, T. Tyler
Growth responses of young Douglas-fir and tanoak 11 years after various levels of hardwood removal and understory suppression in southwestern Oregon, USA Growth responses of young Douglas-fir and tanoak 11 years after various levels of hardwood removal and understory suppression in southwestern Oregon, USA
At two sites in southwestern Oregon, height, diameter, and crown width of young Douglas-fir (Pseudotsuga menziesii) and sprout-origin tanoak (Lithocarpus densiflorus) were measured 1–11 years after reducing the density of a 2-year-old tanoak stand to 0%, 25%, 50%, and 100% of its initial cover. Some plots also included suppression of understory vegetation. Tanoak cover developed linearly...
Authors
T.B. Harrington, John C. Tappeiner
Gradients, vegetation and climate: spatial and temporal dynamics in the Olympic Mountains, USA Gradients, vegetation and climate: spatial and temporal dynamics in the Olympic Mountains, USA
The steep environmental gradients of mountains result in the juxtaposition of diverse vegetation associations with narrow ecotones because life zones are compressed. Variation in geologic substrate, landforms, and soils, in combination with steep environmental gradients, create habitat diversity across spatial scales from 106 ha to
Authors
David L. Peterson, Edward G. Schreiner, Nelsa M. Buckingham