Publications
Filter Total Items: 1971
Rana cascadae (Cascade frog). Cannibalism
No abstract available.
Authors
C.J. Rombough, D.J. Jordan, Christopher A. Pearl
Coexistence in a multispecies assemblage of eagles in central Asia
We evaluated factors that permit species coexistence in an exceptional assemblage of similar raptor species at the Naurzum Zapovednik (a national nature reserve) in north-central Kazakhstan. White-tailed Sea-Eagle (Haliaeetus albicilla), Imperial Eagle (Aquila heliaca), Golden Eagle (A. chrysaetos), and Steppe Eagle (A. nipalensis) all breed at the Zapovednik. Steppe Eagle use of nesting resources
Authors
Todd Katzner, E. Bragin, Steven T. Knick, Andrew T. Smith
Status of native fishes in the western United States and issues for fire and fuels management
Conservation of native fishes and changing patterns in wildfire and fuels are defining challenges for managers of forested landscapes in the western United States. Many species and populations of native fishes have declined in recorded history and some now occur as isolated remnants of what once were larger more complex systems. Land management activities have been viewed as one cause of this prob
Authors
B. Rieman, D. Lee, D. Burns, Robert E. Gresswell, M. Young, R. Stowell, J. Rinne, P. Howell
Fire and aquatic ecosystems of the western USA: Current knowledge and key questions
Understanding of the effects of wildland fire and fire management on aquatic and riparian ecosystems is an evolving field, with many questions still to be resolved. Limitations of current knowledge, and the certainty that fire management will continue, underscore the need to summarize available information. Integrating fire and fuels management with aquatic ecosystem conservation begins with recog
Authors
P.A. Bisson, B. Rieman, C. Luce, Paul F. Hessburg, D. Lee, J. Kershner, G.H. Reeves, Robert E. Gresswell
Introduction to the effects of wildland fire on aquatic ecosystems in the Western USA
The management of wildfire has long been controversial. The role of fire and fire-related management in terrestrial and aquatic ecosystems has become an important focus in recent years, but the general debate is not new. In his recent book, Stephen Pyne (2001 )describes the political and scientific debate surrounding the creation of the U.S. Forest Service and the emergence of fire suppression as
Authors
B. Rieman, Robert E. Gresswell, M. Young, C. Luce
Biomagnification factors (fish to osprey eggs from Willamette River, Oregon, U.S.A.) for PCDDS, PCDFS, PCBS, and OC pesticides
A migratory population of 78 pairs of Osprey (Pandion haliaetus) nesting along the Willamette River in westernOregon was studied in 1993. The study was designed to determinecontaminant concentrations in eggs, contaminant concentrationsin fish species predominant in the Ospreys diet, andBiomagnification Factors (BMFs) of contaminants from fish specieseaten to Osprey eggs. Ten Osprey eggs and 25 com
Authors
Charles J. Henny, James L. Kaiser, Robert A. Grove, V.R. Bentley, J. E. Elliot
Habitat segregation of Ambystoma gracile and Ambystoma macrodactylum in mountain ponds, Mount Rainer National Park, Washington, USA
Ambystoma gracile (Baird) and Ambystoma macrodactylum Baird are common salamander species occupying key trophic positions in mountain ponds and lakes of Mount Rainier National Park (MORA). Based on amphibian surveys conducted in ponds and lakes in the northeast quadrant of MORA during the summers of 1993a??1995, 20 sites were resampled in 1996 to document and evaluate distributions of the two spec
Authors
Robert L. Hoffman, Gary L. Larson, Brendan J. Brokes
Indirect facilitation of an anuran invasion by non-native fishes
Positive interactions among non-native species could greatly exacerbate the problem of invasions, but are poorly studied and our knowledge of their occurrence is mostly limited to plant-pollinator and dispersal interactions. We found that invasion of bullfrogs is facilitated by the presence of co-evolved non-native fish, which increase tadpole survival by reducing predatory macroinvertebrate densi
Authors
M. J. Adams, Christopher A. Pearl, R. Bruce Bury
Gyrfalcon diet in central west Greenland during the nestling period
We studied food habits of Gyrfalcons (Falco rusticolus) nesting in central west Greenland in 2000 and 2001 using three sources of data: time-lapse video (3 nests), prey remains (22 nests), and regurgitated pellets (19 nests). These sources provided different information describing the diet during the nesting period. Gyrfalcons relied heavily on Rock Ptarmigan (Lagopus mutus) and arctic hares (Lepu
Authors
Travis Booms, Mark R. Fuller
Historical wetlands in Oregon's Willamette Valley: Implications for restoration of winter waterbird habitat
Before agricultural expansion in the 19th century, river valleys of North America supported expanses of wetland habitat. In restoring these landscapes, it is important to understand their historical condition and biological function. Synthesizing historical primary accounts (from explorers, travelers, settlers, and farmers) with contemporary knowledge of these wetland systems, we developed a profi
Authors
Oriane W. Taft, Susan M. Haig
New proposed national resources inventory protocols on nonfederal rangelands
No abstract available.
Authors
K.E. Spaeth, F.B. Pierson, J. E. Herrick, P. Shaver, David A. Pyke, Mike Pellant, D. Thompson, B. Dayton
Composition, complexity, and tree mortality in riparian forests in the central Western Cascades of Oregon
Riparian forests contribute to the diversity and function of both terrestrial and aquatic ecosystems. To assess some of these contributions, we compared tree composition, stand complexity, and temporal patterns of tree mortality on permanent plots in seven mature and old-growth stands representing upland forests and forests along low- and mid-order streams in the Western Cascade Range of Oregon. W
Authors
Steve A. Acker, S.V. Gregory, G. Lienkaemper, W.A. McKee, F. J. Swanson, S.D. Miller