Publications
Filter Total Items: 2000
Demography of Northern Spotted Owls in southwestern Oregon
Northern Spotted Owls (Strix occidentalis caurina) are associated with lower elevation, commercially valuable, late-successional coniferous forests in the Pacific Northwest. Meta-analyses of demographic parameters indicate that Northern Spotted Owl populations are declining throughout their range (Anderson and Burnham 1992, Burnham et al. this volume). Recent research has attempted to determine wh
Authors
Cynthia J. Zabel, Susan E. Salmons
Amphibian and reptile abundance in riparian and upslope areas of five forest types in western Oregon
We compared species composition and relative abundance of herpetofauna between riparian and
upslope habitats among 5 forest types (shrub, open sapling-pole, large sawtimber and old-growth
conifer forests, and deciduous forests) in Western Oregon. Riparian- and upslope- associated
species were identified based on capture frequencies from pitfall trapping. Species richness was similar among fores
Authors
D.M. Gomez, R.G. Anthony
Fifteen years of satellite tracking development and application to wildlife research and conservation
No abstract available.
Authors
W. Seegar, P.N. Cutchis, Mark R. Fuller, J.J. Suter, V. Bhatnagar, J.S. Wall
Complete migration cycle of golden eagles breeding in northern Quebec
Radio tracking via satellite was initiated to study the year-round movements
of Golden Eagles(Aquila chrysaetosc anadensis) breeding on the east coast of Hudson Bay,
Quebec. In June and August 1992, six Golden Eagles(five adults and one juvenile) were
marked, three of which completed their year-round movements. The eagles left their breeding
area in mid- to late October and migrated to known w
Authors
Serge Brodeur, R. DeCarie, D.M. Bird, Mark R. Fuller
Surveying woodland hawks with broadcasts of great horned owl vocalization
Pre-recorded vocalizations of great horned owls (Bubo virginianus) broadcast into predominantly wooded habitat along roadside survey routes resulted in as many detections of resident red-shouldered hawks (Buteo lineatus) and Cooper's hawks (Accipiter cooperii) as broadcasts of each conspecific calls. Survey results for 3 species, expressed as average number of contacts/route, were directly related
Authors
James A. Mosher, Mark R. Fuller
Morphological plasticity following species-specific recognition and competition in two perennial grasses
Morphological characteristics and biomass allocation of two perennial grasses, Pseudoroegneria spicata (Pursh) A. Löve ssp. spicata (bluebunch wheatgrass) and Agropyron desertorum (Fisch. ex Link) Schult. (crested wheatgrass), were compared under different competition and nutrient treatments. The competitive responses of two plants grown in containers under field conditions were assessed in monocu
Authors
Elisabeth Huber-Sannwald, David A. Pyke, M. M. Caldwell
Effects of cutting time, stump height, parent tree characteristics, and harvest variables on development of bigleaf maple sprout clumps
In order to determine the effects of stump height, year of cutting, parent-tree size, logging damage, and deer browsing on bigleaf maple (Acer macrophyllum) sprout clump development, maple trees were cut to two stump heights at three different times. Stump height had the greatest impact on sprout clump size. Two years after clearcutting, the sprout clump volume for short stumps was significantly l
Authors
J. C. Tappeiner, J. Zasada, B. Maxwell
Distribution of nearshore macroinvertebrates in lakes of the Northern Cascade Mountains, Washington, USA
During the summer of 1949 studies were conducted at Princeton, New Jersey, to determine the effects on wildlife of DDT used in the control of Dutch elm disease. Direct mortality was determined by intensive search for dead birds after spraying. Twenty-six songbirds, one bat, and one gray squirrel were found. Of 11 dead birds from a study area of approximately 20 acres only one was an adult. S
Authors
Robert L. Hoffman, W.J. Liss, Gary L. Larson, E. Deimling, G.A. Lomnicky
Shorebird use of South Carolina managed and natural coastal wetlands
While many migrating and wintering shorebird (Charadriiformes) species face declines in quality and quantity of natural stopover sites, diked wetlands managed for shorebirds may provide supplemental habitat. We describe an integrative shorebird-waterfowl management strategy used at Tom Yawkey Wildlife Center on South Island, South Carolina, during 3 winter-spring seasons (1991-93). We compared sho
Authors
Louise M. Weber, Susan M. Haig
Microenvironments and microscale productivity of cyanobacterial desert crusts
We used microsensors to characterize physicochemical microenvironments and photosynthesis occurring immediately after water saturation in two desert soil crusts from southeastern Utah, which were formed by the cyanobacteria Microcoleus vaginatus Gomont, Nostoc spp., and Scytonema sp. The light fields within the crusts presented steep vertical gradients in magnitude and spectral composition. Near-s
Authors
F. Garcia-Pichel, Jayne Belnap
DDE decreases in plasma of spring migrant peregrine falcons, 1978-94
Mean p,p'-DDE (DDE) residues in plasma of combined adult and subadult female peregrine falcons (Falco peregrinus) decreased significantly in spring migrants captured at Padre Island, Texas, between 1978 and 1979 (1.00 I?g/g wet wt), 1980 (0.57), 1984 (0.50), and 1994 (0.34). No other organochlorine pesticides were detected (detection limit, 0.02 I?g/g) in 1994. Mirex, oxychlordane, dieldrin, hepta
Authors
Charles J. Henny, W. Seegar, T.L. Maechtle