Publications
Filter Total Items: 2076
Age determination in turtles: Evidence of annual deposition of scute rings Age determination in turtles: Evidence of annual deposition of scute rings
No abstract available.
Authors
David J. Germano, R. Bruce Bury
Vulnerability of desert biological soil crusts to wind erosion: The influences of crust development, soil texture, and disturbance Vulnerability of desert biological soil crusts to wind erosion: The influences of crust development, soil texture, and disturbance
Biological soil crusts, consisting of cyanobacteria, green algae, lichens, and mosses, are important in stabilizing soils in semi-arid and arid lands. Integrity of these crusts is compromised by compressional disturbances such as foot, vehicle, or livestock traffic. Using a portable wind tunnel, we found threshold friction velocities (TFVs) of undisturbed crusts well above wind forces...
Authors
Jayne Belnap, Dale A. Gillette
Demographic and growth responses of a guerrilla and a phalanx perennial grass in competitive mixtures Demographic and growth responses of a guerrilla and a phalanx perennial grass in competitive mixtures
The advantages of guerrilla and phalanx growth for the guerrilla Elymus lanceolatus ssp. lanceolatus and phalanx E. l. ssp. wawawaiensis were evaluated over 2 years in two taxon mixtures with a range of densities of each subspecies and under two levels of watering. Ramet numbers and biomass of the guerrilla subspecies were higher than those of the phalanx grass in the first year but in...
Authors
L. David Humphrey, David A. Pyke
Impact of alternative regeneration methods on genetic diversity in coastal Douglas-fir Impact of alternative regeneration methods on genetic diversity in coastal Douglas-fir
Genetic implications of natural and artificial regeneration following three regeneration methods (group selection, shelterwood, and clearcut) were investigated in coastal Douglas-fir (Pseudotsuga menziesii var. menziesii [Mirb.] Franco) using genetic markers (17 allozyme loci). In general, harvesting followed by either natural or artificial regeneration resulted in offspring populations...
Authors
W.T. Adams, J. Zuo, J.Y. Shimizu, J. C. Tappeiner
Spatial distribution of breeding passerine bird habitats in a shrubsteppe region of southwestern Idaho Spatial distribution of breeding passerine bird habitats in a shrubsteppe region of southwestern Idaho
A paper describing the similarities and differences between trichomoniasis and pox infection. The need for laboratory diagnosis to differentiate between them is indicated.
Authors
Steven T. Knick, J.T. Rotenberry
Wetland connectivity and waterbird conservation in the western Great Basin of the United States: Introduction to workshop Wetland connectivity and waterbird conservation in the western Great Basin of the United States: Introduction to workshop
As scientists, managers and landowners, we have come to realize that to best understand the local and regional value of individual wetlands, we need to take a broad geographic, taxonomic, and management view. In December 1994, a symposium was held in Reno, Nevada that addressed this topic for shorebirds by bringing together researchers and managers from the Western Great Basin to discuss...
Authors
Susan M. Haig, Lewis W. Oring
Experimental analysis of trout effects on survival, growth, and habitat use of two species of western Ambystomatid salamanders Experimental analysis of trout effects on survival, growth, and habitat use of two species of western Ambystomatid salamanders
Introduced fish have been implicated as reducing abundance or eliminating ambystomatid salamanders from montane lakes in western North America. We tested the null hypotheses that survivorship, growth, and refuge use of larvae reared for 30 d did not differ between artificial ponds with trout and without trout. Larval survivorship for both A. macrodactylum and A. gracile was significantly...
Authors
T. Tyler, W.J. Liss, Robert L. Hoffman, L. Ganio
Amphibians of the Fort Lewis Military Reservation, Washington: Sampling techniques and community patterns Amphibians of the Fort Lewis Military Reservation, Washington: Sampling techniques and community patterns
The 27,000 ha Fort Lewis Military Reservation is situated in the Puget lowlands and contains a wide variety of aquatic habitats offering potential refuge for native amphibians. We surveyed amphibians on Fort Lewis from 1992 through 1995 to examine occupancy patterns relative to wetland characteristics. We documented 9 native amphibians and 1 introduced anuran (Rana catesbeiana) that...
Authors
M. J. Adams, R. Bruce Bury, Scott A. Swarts
Organochlorine pesticides, PCBs, and mercury in Osprey (Pandion haliaetus) eggs from the Upper Volga River, Russia Organochlorine pesticides, PCBs, and mercury in Osprey (Pandion haliaetus) eggs from the Upper Volga River, Russia
The Osprey population associated with Darwin Nature Reserve and the Rybinsk Reservoir increased from only a few pairs prior to the creation of the reservoir in the late 1940s , to about 45-50 pairs in 1994. Productivity rates were excellent in 1988 and 1989 (1.38 young/occupied nest), but extremely low in 1987 (0.47 young/occupied nest). A chemical spill into the Volga River in early...
Authors
Charles J. Henny, V.M. Galushin, A.V. Kuznetsov
Understory vegetation in old and young Douglas-fir forests of western Oregon Understory vegetation in old and young Douglas-fir forests of western Oregon
We studied understory composition in thinned and unthinned Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco)/western hemlock (Tsuga heterophylla (Raf.) Sarg.) stands on 28 sites in western Oregon. These stands had regenerated naturally after timber harvest, 40–70 years before thinning. Commercial thinning had occurred 10–24 years previously, with 8–60% of the volume removed from below...
Authors
J. D. Bailey, C. Mayrsohn, P. S. Doescher, Elizabeth St. Pierre, J. C. Tappeiner
Forest floor bryophytes of Pseudotsuga menziesii-Tsuga heterophylla stand in Oregon: Influences of substrate and overstory Forest floor bryophytes of Pseudotsuga menziesii-Tsuga heterophylla stand in Oregon: Influences of substrate and overstory
Species richness and abundance of bryophytes inhabiting forest floor substrates were assessed at two sites in western Oregon. Bryophyte diversity, abundance, and community composition were compared between sites, and between young forest stands (~55 yrs) and old-growth stands (400 + yrs) within each site. Relationships of stand structural features to diversity and community composition...
Authors
T. Rambo, Patricia S. Muir
Book Review: Preserving nature in the national parks - A history Book Review: Preserving nature in the national parks - A history
No abstract available.
Authors
D. L. Peterson