Publications
Filter Total Items: 1994
Response of birds to thinning young Douglas-fir forests
As a result of recent fire history and decades of even-aged forest management,
many coniferous forests in western Oregon are composed of young (20-50 yrs), densely stocked Douglas-fir stands. Often these stands are structurally
simple - a single canopy layer with one or two overstory tree species - and have a relatively sparse understory. The lack of structural complexity in these stands may lim
Authors
John P. Hayes, Jennifer M. Weikel, Manuela M. P. Huso, Janet L. Erickson
Teetering on the edge or too late? Conservation and research issues for avifauna of sagebrush habitats
Degradation, fragmentation, and loss of native sagebrush (Artemisia spp.) landscapes have imperiled these habitats and their associated avifauna. Historically, this vast piece of the Western landscape has been undervalued: even though more than 70% of all remaining sagebrush habitat in the United States is publicly owned, <3% of it is protected as federal reserves or national parks. We review the
Authors
Steven T. Knick, David S. Dobkin, John T. Rotenberry, Michael A. Schroeder, W. Matthew Vander Haegen, Charles van Riper
Soil fertility in deserts: A review on the influence of biological soil crusts and the effect of soil surface disturbance on nutrient inputs and losses
Sources of desert soil fertility include parent material weathering, aeolian deposition, and on-site C and N biotic fixation. While parent materials provide many soil nutrients, aeolian deposition can provide up to 75% of plant-essential nutrients including N, P, K, Mg, Na, Mn, Cu, and Fe. Soil surface biota are often sticky, and help retain wind-deposited nutrients, as well as providing much of t
Authors
Jayne Belnap, S. Phillips, M. Duniway, Richard L. Reynolds
Protocol for determining bull trout presence
The Western Division of the American Fisheries Society was requested to develop protocols for
determining presence/absence and potential habitat suitability for bull trout. The general
approach adopted is similar to the process for the marbled murrelet, whereby interim guidelines
are initially used, and the protocols are subsequently refined as data are collected. Current data
were considere
Authors
James Peterson, Jason B. Dunham, Philip Howell, Russell Thurow, Scott Bonar
The endemic headwater stream amphibians of the American Northwest: Associations with environmental gradients in a large forested preserve
We used a large forested preserve (Olympic National Park, USA) to examine the habitat associations of a unique and environmentally sensitive stream amphibian fauna: Ascaphus truei Stegneger, Rhyacotriton olympicus (Gaige) and Dicamptodon copei Nussbaum. We quantified the relative abundance of stream amphibians and compared them to physical, topographic, climatic and landscape variables. All three
Authors
M. J. Adams, R. Bruce Bury
Terrestrial and stream amphibians across clearcut-forest interfaces in the Siskiyou Mountains, Oregon
Timber harvest in the Pacific Northwest has resulted in a highly fragmented landscape. but there is no information on responses of amphibians to forest edges for this region. We investigated abundance of terrestrial and stream-dwelling amphibians on the interface of recent clearcuts and mature forest in the Siskiyou Mountains, Oregon, in summer and fall of 1998. We assessed relative abundance of t
Authors
Roman Biek, L. Scott Mills, R. Bruce Bury
Growth of Usnea longissima across a variety of habitats in the Oregon Coast Range
No abstract available.
Authors
D. Keon, P.S. Muir
Comparison of soil bacterial communities in rhizospheres of three plant species and the interspaces in an arid grassland
Soil bacteria are important contributors to primary productivity and nutrient cycling in arid land ecosystems, and their populations may be greatly affected by changes in environmental conditions. In parallel studies, the composition of the total bacterial community and of members of the Acidobacterium division were assessed in arid grassland soils using terminal restriction fragment length polymo
Authors
Cheryl R. Kuske, Lawrence O. Ticknor, Mark E. Miller, John M. Dunbar, Jody A. Davis, Susan M. Barns, Jayne Belnap
Distribution and abundance of snowy plovers in eastern North America, the Caribbean, and the Bahamas
Snowy Plovers (Charadrius alexandrinus) are small, partially migrant shorebirds that are broadly distributed across North America. Snowy Plover distribution west of the Rocky Mountains has been well described. However, distribution and abundance east of the Rocky Mountains has not received much attention despite current status and ESA listing concerns for Snowy Plovers in the southeastern United S
Authors
Leah Gorman, Susan M. Haig
Alien invasions in aquatic ecosystems: Toward an understanding of brook trout invasions and potential impacts on inland cutthroat trout in western North America
Experience from case studies of biological invasions in aquatic ecosystems has motivated a set of proposed empirical “rules” for understanding patterns of invasion and impacts on native species. Further evidence is needed to better understand these patterns, and perhaps contribute to a useful predictive theory of invasions. We reviewed the case of brook trout (Salvelinus fontinalis)invasions in th
Authors
Jason B. Dunham, Susan B. Adams, Robert Schroeter, Douglas C. Novinger
Collaborative approaches to the evolution of migration and the development of science-based conservation in shorebirds
Shorebirds are among the most highly migratory creatures on earth. Both the study of their ecology and ongoing efforts to conserve their populations must reflect this central aspect of their biology. Many species of shorebirds use migration and staging sites scattered throughout the hemisphere to complete their annual migrations between breeding areas and nonbreeding habitats (Morrison 1984). The
Authors
Brian A. Harrington, S. Brown, James Corven, Jonathan Bart