A female black bear denning habitat model using a geographic information system
J. D. Clark, S.G. Hayes, J.M. Pledger
1998, Ursus (10) 181-185
We used the Mahalanobis distance statistic and a raster geographic information system (GIS) to model potential black bear (Ursus americanus) denning habitat in the Ouachita Mountains of Arkansas. The Mahalanobis distance statistic was used to represent the standard squared distance between sample variates in the GIS database (forest cover type,...
Estimating species richness: The Michaelis-Menten model revisited
K.A. Keating, J.F. Quinn
1998, Oikos (81) 411-416
The Michaelis-Menten model has been widely used to estimate the richness (S) of species pools, but is largely untested. We tested whether (1) species accumulation curves follow the form predicted by the model, (2) the model gives unbiased estimates (Ŝ and B̂, respectively) of S and of the sample size,...
A comparison of triploid induction validation techniques
R.M. Harrell, W. Van Heukelem, J.H. Kerby
1998, Progressive Fish-Culturist (60) 221-226
Triploidy induction is a technique that allows genetic manipulation of chromosome number to control reproduction and potentially create faster‐growing animals; however, most methods for inducing polyploidy are not 100% effective. Using sunshine bass (white bass Morone chrysops ♀ × striped bass M. saxatilis ♂) as a model, we cross‐validated the most common verification techniques:...
Age and growth of lake sturgeon in the Upper St. Lawrence River
James H. Johnson, David S. Dropkin, S. R. LaPan, James E. McKenna Jr., Rodger M Klindt
1998, Journal of Great Lakes Research (24) 474-478
The growth of lake sturgeon (Acipenser fulvescens) over time in the upper St. Lawrence River was examined. Growth of lake sturgeon collected during 1993 and 1994 below Robert Moses Dam near Massena, New York, was compared to that reported for the same population almost 25 years earlier. The data suggest...
Assessing relative abundance and reproductive success of shrubsteppe raptors
Robert N. Lehman, L.B. Carpenter, Karen Steenhof, Michael N. Kochert
1998, Journal of Field Ornithology (69) 244-256
From 1991-1994, we quantified relative abundance and reproductive success of the Ferruginous Hawk (Buteo regalis), Northern Harrier (Circus cyaneus), Burrowing Owl (Speotytoc unicularia), and Short-eared Owl (Asio flammeus) on the shrubsteppe plateaus (benchlands) in and near the Snake River Birds of Prey National Conservation Area in southwestern Idaho. To assess relative abundance, we searched...
Importance of rearing-unit design and stocking density to the behavior, growth and metabolism of lake trout (Salvelinus namaycush)
Robert M. Ross, Barnaby J. Watten
1998, Aquacultural Engineering (19) 41-56
Juvenile lake trout (Salvelinus namaycush) were held at different stocking densities (48 and 96 kg m−3) in rearing-units of different design (rectangular plug-flow, circular and cylindrical cross-flow) and the effects on behavior, growth and metabolism were examined. Ambient light levels and current velocities were measured in each of three tank...
Effects of the herbicide atrazine on Ambystoma tigrinum metamorphosis: duration, larval growth, and hormonal response
Diane L. Larson, Susan McDonald, Steven J. Hamilton, Albert J. Fivizzani, Wesley E. Newton
1998, Physiological Zoology (71) 671-679
We exposed larval tiger salamanders (Ambystoma tigrinum) reared in the laboratory from eggs collected from a prairie wetland in North Dakota to three concentrations of atrazine (0, 75, and 250 i??g/L) in a static renewal test to determine the pesticide's effect on (1) plasma corticosterone and thyroxine concentrations, (2) larval...
Deep earthquakes beneath the Fiji Basin, SW Pacific: Earth's most intense deep seismicity in stagnant slabs
E.A. Okal, S. H. Kirby
1998, Physics of the Earth and Planetary Interiors (109) 25-63
Previous work has suggested that many of the deep earthquakes beneath the Fiji Basin occur in slab material that has been detached and foundered to the bottom of the transition zone or has been laid down by trench migration in a similar recumbent position. Since nowhere else in the Earth...
Renewal of voluntary feeding by wild‐caught Atlantic sturgeon juveniles in captivity
M. N. DiLauro
1998, Progressive Fish-Culturist (60) 311-314
A modification of previously documented force‐feeding procedures resulted in the renewal of appetite by several wild‐caught juvenile Atlantic sturgeon Acipenser oxyrinchus. Four of four fish under controlled laboratory conditions responded positively to this technique within 1 month. These fish exhibited negative mean growth rates of −2.71 g/d before force‐feeding and gained an...
Effects of capture and handling on survival of female northern pintails
R. R. Cox Jr., A. D. Afton
1998, Journal of Field Ornithology (69) 276-287
Identification of capture and handling procedures that influence survival of waterfowl has important research and management implications. We captured 347 female Northern Pintails (Anas acuta) using rocket nets, fitted them with harness (backpack-type) radio transmitters, and monitored their survival during the first 10 d following release. Females were 16 times...
Net trophic transfer efficiency of PCBs to Lake Michigan coho salmon from their prey
Charles P. Madenjian, Robert F. Elliott, Larry J. Schmidt, Timothy J. Desorcie, Robert J. Hesselberg, Richard T. Quintal, Linda J. Begnoche, Patrick M. Bouchard, Mark E. Holey
1998, Environmental Science & Technology (32) 3063-3067
Most of the polychlorinated biphenyl (PCB) body burden accumulated by coho salmon (Oncorhynchus kisutch) from the Laurentian Great Lakes is from their food. We used diet information, PCB determinations in both coho salmon and their prey, and bioenergetics modeling to estimate the efficiency with which Lake Michigan coho salmon retain...
Estimate of net trophic transfer efficiency of PCBs to Lake Michigan lake trout from their prey
Charles P. Madenjian, Robert J. Hesselberg, Timothy J. Desorcie, Larry J. Schmidt, Ralph M. Stedman, Richard T. Quintal, Linda J. Begnoche, Dora R. Passino-Reader
1998, Environmental Science & Technology (32) 886-891
Most of the polychlorinated biphenyl (PCB) body burden accumulated by lake trout (Salvelinus namaycush) from the Laurentian Great Lakes is from their food. We used diet information, PCB determinations in both lake trout and their prey, and bioenergetics modeling to estimate the efficiency with which Lake Michigan lake trout retain...
Mallard duckling growth and survival in relation to aquatic invertebrates
R. R. Cox Jr., M.A. Hanson, C.C. Roy, N.H. Euliss Jr., Douglas H. Johnson, Malcolm G. Butler
1998, Journal of Wildlife Management (62) 124-133
Identification and assessment of the relative importance of factors affecting duckling growth and survival are essential for effective management of mallards on breeding areas. For each of 3 years (1993-95), we placed F1-generation wild mallard (Anas platyrhynchos) females on experimental wetlands and allowed them to mate, nest, and rear broods...
Large-scale fire disturbance: From concepts to models
D. L. Peterson
1998, Northwest Science (72) 1-3
No abstract available....
A bioenergetics modeling evaluation of top-down control of ruffe in the St. Louis River, western Lake Superior
Kathleen R. Mayo, James H. Selgeby, Michael E. McDonald
1998, Journal of Great Lakes Research (24) 329-342
Ruffe (Gymnocephalus cernuus), were accidentally introduced into the St. Louis River estuary, western Lake Superior, in the mid 1980s and it was feared that they might affect native fish through predation on eggs and competition for forage and habitat. In an effort to control the abundance of ruffe and...
Fire, vegetation, and scale: Toward optimal models for the Pacific Northwest
D. McKenzie
1998, Northwest Science (72) 49-65
No abstract available....
Avian movements and wetland connectivity in landscape conservation
Susan M. Haig, D.W. Mehlman, L.W. Oring
1998, Conservation Biology (12) 749-758
The current conservation crisis calls for research and management to be carried out on a long-term, multi-species basis at large spatial scales. Unfortunately, scientists, managers, and agencies often are stymied in their effort to conduct these large-scale studies because of a lack of appropriate technology, methodology, and funding. This issue...
Reconstructing the spatial pattern of trees from routine stand examination measurements
M.L. Hanus, D.W. Hann, D.D. Marshall
1998, Forest Science (44) 125-133
Reconstruction of the spatial pattern of trees is important for the accurate visual display of unmapped stands. The proposed process for generating the spatial pattern is a nonsimple sequential inhibition process, with the inhibition zone proportionate to the scaled maximum crown width of an open-grown tree of the same species...
Volcanoes
Robert I. Tilling
1998, Report
Volcanoes destroy and volcanoes create. The catastrophic eruption of Mount St. Helens on May 18, 1980, made clear the awesome destructive power of a volcano. Yet, over a time span longer than human memory and record, volcanoes have played a key role in forming and modifying the planet upon which...
The Chesapeake Bay bolide: Modern consequences of an ancient cataclysm
C. Wylie Poag
1998, Report
During the late Eocene, the formerly quiescent geological regime of the Virginia Coastal Plain was dramatically transformed when a bolide struck in the vicinity of the Delmarva Peninsula, and produced the following principal consequences:The bolide carved a roughly circular crater twice the size of the state of Rhode Island (~6400...
Micas from the Pikes Peak batholith and its cogenetic granitic pegmatites, Colorado: Optical properties, composition, and correlation with pegmatite evolution
D. E. Kile, E.E. Foord
1998, Canadian Mineralogist (36) 463-482
Optical properties are presented for 66 samples of mica covering the range from annite ??? biotite ??? zinnwaldite ??? ferroan lepidolite and ferroan muscovite from occurrences of granitic pegmatite (NYF type) throughout the Pikes Peak batholith (PPB) in Colorado. Chemical composition was determined for 34 of these samples. The optical...
Numerical modelling of vertically extensive groundwater bodies in Maui, Hawaii: An alternative to perched aquifers
S. B. Gingerich
1998, IAHS-AISH Publication 167-174
Groundwater in East Maui, Hawaii is traditionally described as a series of discrete aquifers perched on low-permeability units underlain by a basal lens with heads of about 2-3 m. An alternative concept, a fully saturated aquifer to as much as 1400 m elevation, was investigated using a numerical model with...
Predicting CH4 adsorption capacity of microporous carbon using N2 isotherm and a new analytical model
Jielun Sun, S. Chen, M. Rostam-Abadi, M.J. Rood
1998, ACS Division of Fuel Chemistry, Preprints (43) 596-599
A new analytical pore size distribution (PSD) model was developed to predict CH4 adsorption (storage) capacity of microporous adsorbent carbon. The model is based on a 3-D adsorption isotherm equation, derived from statistical mechanical principles. Least squares error minimization is used to solve the PSD without any pre-assumed distribution function....
Poroelastic rebound along the Landers 1992 earthquake surface rupture
G. Peltzer, P. Rosen, F. Rogez, K. Hudnut
1998, Journal of Geophysical Research B: Solid Earth (103) 30131-30145
Maps of surface displacement following the 1992 Landers, California, earthquake, generated by interferometric processing of ERS-1 synthetic aperture radar (SAR) images, reveal effects of various postseismic deformation processes along the 1992 surface rupture. The large-scale pattern of the postseismic displacement field includes large lobes, mostly visible on the west side...
Precipitation interpolation in mountainous regions using multiple linear regression
L. Hay, R. Viger, G. McCabe
1998, IAHS-AISH Publication (248) 33-38
Multiple linear regression (MLR) was used to spatially interpolate precipitation for simulating runoff in the Animas River basin of southwestern Colorado. MLR equations were defined for each time step using measured precipitation as dependent variables. Explanatory variables used in each MLR were derived for the dependent variable locations from a...
