Publications
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Effects of soil amendments on germination and emergence of downy brome (Bromus tectorum) and Hilaria jamesii Effects of soil amendments on germination and emergence of downy brome (Bromus tectorum) and Hilaria jamesii
Downy brome is an introduced Mediterranean annual grass that now dominates millions of hectares of western U.S. rangelands. The presence of this grass has eliminated many native species and accelerated wildfire cycles. The objective of this study was to identify soil additives that allowed germination but inhibited emergence of downy brome, while not affecting germination or emergence of...
Authors
J. Belnap, S. K. Sherrod, M. E. Miller
Organochlorine pesticides in eggs of brids of prey from the Stavropol Region, Russia Organochlorine pesticides in eggs of brids of prey from the Stavropol Region, Russia
No abstract available.
Authors
Charles J. Henny, V.M. Galushin, Alexander N. Khokhlov, Ljubor V. Malovichko, M.P. Iijukh
Rana cascadae (Cascade frog). Cannibalism Rana cascadae (Cascade frog). Cannibalism
No abstract available.
Authors
C.J. Rombough, D.J. Jordan, Christopher A. Pearl
Biomagnification factors (fish to osprey eggs from Willamette River, Oregon, U.S.A.) for PCDDS, PCDFS, PCBS, and OC pesticides 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...
Authors
Charles J. Henny, James L. Kaiser, Robert A. Grove, V.R. Bentley, J. E. Elliot
Indirect facilitation of an anuran invasion by non-native fishes 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...
Authors
M. J. Adams, Christopher A. Pearl, R. Bruce Bury
Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A Large wood recruitment and redistribution in headwater streams in the southern Oregon Coast Range, U.S.A
Large wood recruitment and redistribution mechanisms were investigated in a 3.9 km2 basin with an old-growth Pseudotsuga menziesii (Mirb.) Franco and Tsuga heterophylla (Raf.) Sarg. forest, located in the southern Coast Range of Oregon. Stream size and topographic setting strongly influenced processes that delivered wood to the channel network. In small colluvial channels draining steep...
Authors
Christine L. May, Robert E. Gresswell
A Framework for Long-term Ecological Monitoring in Olympic National Park: Prototype for the Coniferous Forest Biome A Framework for Long-term Ecological Monitoring in Olympic National Park: Prototype for the Coniferous Forest Biome
This report is the result of a five-year collaboration between scientists of the U.S. Geological Survey Forest and Rangeland Ecosystem Science Center, Olympic Field Station, and the natural resources staff of Olympic National Park to develop a comprehensive strategy for monitoring natural resources of Olympic National Park. Olympic National Park is the National Park Serviceʼs prototype...
Authors
Kurt Jenkins, Andrea Woodward, Ed Schreiner
PRAIRIEMAP: A GIS database for prairie grassland management in western North America PRAIRIEMAP: A GIS database for prairie grassland management in western North America
The USGS Forest and Rangeland Ecosystem Science Center, Snake River Field Station (SRFS) maintains a database of spatial information, called PRAIRIEMAP, which is needed to address the management of prairie grasslands in western North America. We identify and collect spatial data for the region encompassing the historical extent of prairie grasslands (Figure 1). State and federal agencies...
Authors
Water Resources Division U.S. Geological Survey
Management implications of the ecology of free-roaming horses in semiarid ecosystems of the western United States Management implications of the ecology of free-roaming horses in semiarid ecosystems of the western United States
Compared to other ungulates of North America, free-roaming horses (Equus caballus) possess a unique evolutionary history that has given rise to a distinct suite of behavioral, morphological, and physiological traits. Because of their unique combination of cecal digestion, an elongate head with flexible lips, and non-uniform use of the landscape, horses represent a unique disturbance...
Authors
Erik Beever
Estimates of global cyanobacterial biomass and its distribution Estimates of global cyanobacterial biomass and its distribution
We estimated global cyanobacterial biomass in the main reservoirs of cyanobacteria on Earth: marine and freshwater plankton, arid land soil crusts, and endoliths. Estimates were based on typical population density values as measured during our research, or as obtained from literature surveys, which were then coupled with data on global geographical area coverage. Among the marine...
Authors
Ferran Garcia-Pichel, Jayne Belnap, Susanne Neuer, Ferdinand Schanz
The Killdeer (Charadrius vociferus) The Killdeer (Charadrius vociferus)
No abstract available.
Authors
P.M. Sanzenbacher, Susan M. Haig