Publications
Filter Total Items: 1994
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
Soil surface disturbances in cold deserts: Effects on nitrogenase activity in cyanobacterial-lichen soil crusts
CyanobacteriaMichen soil crusts can be a dominant
source of nitrogen for cold-desert ecosystems. Effects
of surface disturbance from footprints, bike and vehicle
tracks on the nitrogenase activity in these crusts was investigated.
Surface disturbances reduced nitrogenase activity
by 30-100%. Crusts dominated by the cyanobacterium
Microcoleus vaginatus on sandy soils were the most susceptible
Authors
Jayne Belnap
Indicators of red squirrel (Tamiasciurus hudonicus) abundance in the whitebark pine zone
We investigated occupied squirrel middens and squirrel sightings and vocalizations as indicators of red squirrel (Tamiasciurus hudsonicus) abundance in the high-elevation whitebark pine (Pinus albicaulis) zone. Data were collected 1984-1989 from line transects located on 2 study sites in the Yellowstone ecosystem. We evaluated the performance of each measure on the basis of precision and biologica
Authors
D.J. Mattson, Daniel P. Reinhart
Ecology of kokanee salmon (Oncorhynchus nerka) and rainbow trout (Oncorhynchus mykiss) in Crater Lake, Oregon
No abstract available.
Authors
M. W. Buktenica, Gary L. Larson
Zooplankton assemblages in Crater Lake, Oregon, USA
The zooplankton community in Crater Lake was comprised of 11 rotifer species and 2 species of cladocerans. Most zooplankton taxa were distributed in winter and spring from the lake surface to a depth of about 200 m, the maximum depth of mixing of lake waters by wind energy. The distribution of zooplankton species was partitioned in the water column to a depth of 200 m during summer and fall, which
Authors
Gary L. Larson, C. D. McIntire, R.E. Truitt, M. W. Buktenica, E. Karnaugh-Thomas
Taxonomic structure and productivity of phytoplankton assemblages in Crater Lake, Oregon
Interactions among physical, chemical, and biological components and processes in Crater Lake result in a complex and dynamic ecosystem. In winter and spring, wind energy mixes the lake to a depth of about 200 m. During this period, episodic sinking of cold water below the depth of 200 m produces an upwelling of nutrient-rich water from the deep lake, a process that has a strong influence on the c
Authors
C. D. McIntire, Gary L. Larson, R.E. Truitt, M.K. Debacon
Temperature, water chemistry, and optical properties of Crater Lake
Water temperature, water chemistry, and optical properties of Crater Lake were studied from 1983 to 1991. In winter and spring, wind energy and convection mixed the water column to a depth of 200 to 250 m. The lake was thermally stratified in summer and early fall; however, the epilimnion was only 5 to 20 m thick, and most of the 589 m deep water column was a cold hypolimnion. The lake was slightl
Authors
Gary L. Larson, C. D. McIntire, M. W. Buktenica