Publications
Filter Total Items: 1978
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
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
Factors leading to different viability predictions for a grizzly bear data set
Population viability analysis programs are being used increasingly in research and management applications, but there has not been a systematic study of the congruence of different program predictions based on a single data set. We performed such an analysis using four population viability analysis computer programs: GAPPS, INMAT, RAMAS/AGE, and VORTEX. The standardized demographic rates used in a
Authors
L. S. Mills, S.G. Hayes, M.J. Wisdom, J. Citta, D.J. Mattson, K. Murphy
Science and management of Rocky Mountain grizzly bears
The science and management of grizzly bears (Ursus arctos horribilis) in the Rocky Mountains of North America have spawned considerable conflict and controversy. Much of this can be attributed to divergent public values, but the narrow perceptions and incomplete and fragmented problem definitions of those involved have exacerbated an inherently difficult situation. We present a conceptual model th
Authors
D.J. Mattson, S. Herrero, R. G. Wright, C. M. Pease
Population structure of red-cockaded woodpeckers (Picoides borealis) in south Florida: RAPDs revisited
Six south Florida populations of the endangered red-cockaded woodpecker (Picoides borealis) were sampled to examine genetic diversity and population structure in the southernmost portion of the species' range relative to 14 previously sampled populations from throughout the species range. Random amplified polymorphic DNA (RAPD) analyses were used to evaluate the populations (n= 161 individuals, 13
Authors
Susan M. Haig, R. Bowman, Thomas D. Mullins
Influence of radio transmitters on prairie falcons (Falco mexicanus)
We examined the effects of backpack radio transmitters on Prairie Falcon (Falco mexicanus) reproduction (percentage of occupied territories producing young and number of nestlings produced) over four years. In addition, we observed falcon aeries during brood-rearing to determine attendance at the nest and in the territory, prey delivery rates, and prey composition. We found no effect of radio tagg
Authors
M.S. Vekasy, J.M. Marzluff, Michael N. Kochert, Robert N. Lehman, Karen Steenhof
Diet and trophic characteristics of great horned owls in southwestern Idaho
We studied the diet of Great Horned Owls (Bubo virginianus) in the Snake River Birds of Prey National Conservation Area in southwestern Idaho for 14 breeding seasons. The diet included 89.2% mammals by number and 91.2% by mass. Kangaroo rats (Dipodomys spp.) were the most common prey overall, but montane voles (Microtus montanus), Peromyscus spp., Great Basin pocket mice (Perognathus parvus) and T
Authors
C.D. Marti, Michael N. Kochert
Overview of the limnology of Crater Lake
Crater Lake occupies the collapsed caldera of volcanic Mount Mazama in Crater Lake National
Park, Oregon. It is the deepest lake (589 m) in the United States and the 7th deepest lake in the world. The water column mixes to a depth of about 200 m in winter and spring from wind energy and cooling. The deep lake is mixed in winter and early spring each year when relatively cold water near the surfac
Authors
Gary L. Larson