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Page 3229, results 80701 - 80725

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Publication Extents

Not all publications have extents, not all extents are completely accurate
Cowbird parasitism in grassland and cropland in the northern Great Plains
Rolf R. Koford, B. S. Bowen, John T. Lokemoen, Arnold D. Kruse
James N.M. Smith, T.L. Cook, S. IU. Rothstein, S.K. Robinson, S.G. Sealy, editor(s)
2000, Book chapter, Ecology and management of cowbirds and their hosts
The landscape of the Great Plains has been greatly altered by human activities in the past century, and several grassland passerines have experienced significant population declines in recent decades. We explore here whether brood parasitism by Brown-headed Cowbirds, which are abundant in the Great Plains, has contributed to these declines....
Foods of arctic foxes (Alopex lagopus) during winter and spring in western Alaska
M. Anthony, N.K. Barten, P.E. Seiser
2000, Journal of Mammalogy (81) 820-828
During 1986–1991, carcasses of 619 arctic foxes (Alopex lagopus) collected from local trappers and at biological field camps on the Yukon-Kuskokwim Delta in western Alaska from November through May were analyzed to determine gastrointestinal contents, age, sex, and body condition. Prey in declining order of importance were small mammals...
Water movement through a thick unsaturated zone underlying an intermittent stream in the western Mojave Desert, southern California, USA
J. A. Izbicki, J. Radyk, R. L. Michel
2000, Journal of Hydrology (238) 194-217
Previous studies indicated that small amounts of recharge occur as infiltration of intermittent streamflow in washes in the upper Mojave River basin, in the western Mojave <a title="Learn more about Deserts" href="https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/deserts"...
Field evaluation of lead effects on Canada geese and mallards in the Coeur d'Alene River Basin, Idaho
Charles J. Henny, L. J. Blus, D. J. Hoffman, L. Sileo, Daniel J. Audet, Mark R. Snyder
2000, Archives of Environmental Contamination and Toxicology (39) 97-112
Hatch year (HY) mallards (Anas platyrhynchos) in the Coeur d'Alene (CDA) River Basin had higher concentrations of lead in their blood than HY Western Canada geese (Branta canadensis moffitti) (geometric means 0.98 versus 0.28 μg/g, wet weight). The pattern for adults of both species was similar,...
Postbreeding movements of American Avocets and implications for wetland connectivity in the western Great Basin
Jonathan H. Plissner, Susan M. Haig, L.W. Oring
2000, The Auk (117) 290-298
Wetlands in the western Great Basin of the United States are patchily distributed and undergo extensive seasonal and annual variation in water levels. The American Avocet (Recurvirostra americana) is one of many shorebird species that use these wetlands as breeding and migratory stopover sites and must adjust to variable conditions....
Seasonal changes in ruffe abundance in two Lake Superior tributaries: Implications for control
William H. Horns, William P. Brown, Scott R. Hulse, Charles R. Bronte
2000, North American Journal of Fisheries Management (20) 822-826
Since the discovery of ruffe Gymnocephalus cernuus in the St. Louis River in 1987, state, federal, and tribal management agencies have sought to slow its spread to areas outside the western end of Lake Superior. A debate over control strategies highlighted uncertainties about seasonal movements of this species between Lake Superior and...
Book review: A natural history of the Sonoran Desert
Matthew L. Brooks
2000, Madroño (47) 68-69
Review info: A Natural History of the Sonoran Desert. Edited by S. J. Phillips and P. W. Comus. 2000. Arizona-Sonora Desert Museum Press, Tucson AZ, and University of California Press, Berkeley CA. 628 pp. Cloth ISBN 0-520-22029-3 Paper ISBN 0-520-21980-5....
No consistent effect of plant diversity on productivity
M.A. Huston, L.W. Aarssen, M.P. Austin, B.S. Cade, J.D. Fridley, E. Garnier, J.P. Grime, J. Hodgson, W.K. Lauenroth, K. Thompson, J.H. Vandermeer, D.A. Wardle
2000, Science (289)
Hector et al. (1) reported on BIODEPTH, a major international experiment on the response of plant productivity to variation in the number of plant species. They found “an overall log-linear reduction of average aboveground biomass with loss of species,” leading to what the accompanying Perspective (2) described as “a rule...
Processing RoxAnn sonar data to improve its categorization of lake bed surficial sediments
Gary Cholwek, John Bonde, Xing Li, Carl Richards, Karen Yin
2000, Marine Geophysical Research (21) 409-421
To categorize spawning and nursery habitat for lake trout in Minnesota's near shore waters of Lake Superior, data was collected with a single beam echo sounder coupled with a RoxAnn bottom classification sensor. Test areas representative of different bottom surficial substrates were sampled. The collected data consisted of acoustic signals...
The genetics of amphibian decline: population substructure and molecular differentiation in the Yosemite toad, Bufo canorus (Anura, Bufonidae) based on single-strand conformation polymorphism analysis (SSCP) and mitochondrial DNA sequence data
H. Bradley Shaffer, Gary M. Fellers, Allison Magee, S. Randal Voss
2000, Molecular Ecology (9) 245-257
We present a comprehensive survey of genetic variation across the range of the narrowly distributed endemic Yosemite toad Bufo canorus, a declining amphibian restricted to the Sierra Nevada of California. Based on 322 bp of mitochondrial cytochrome b sequence data, we found limited support for the monophyly of B. canorus and...
Movement patterns of riparian small mammals during predictable floodplain inundation
D.C. Andersen, K.R. Wilson, M. S. Miller, M. Falck
2000, Journal of Mammalogy (81) 1087-1099
We monitored movements of small mammals resident on floodplains susceptible to spring floods to assess whether and how these animals respond to habitat inundation. The 2 floodplains were associated with 6th order river segments in a semiarid landscape; each was predictably inundated each year as snowmelt progressed in headwater areas...
Temporal coherence of two alpine lake basins of the Colorado Front Range, USA
Jill Baron, N. Caine
2000, Freshwater Biology (43) 463-476
1. Knowledge of synchrony in trends is important to determining regional responses of lakes to disturbances such as atmospheric deposition and climate change. We explored the temporal coherence of physical and chemical characteristics of two series of mostly alpine lakes in nearby basins of the Colorado Rocky Mountains. Using year-to-year...
Estimating cumulative effects of clearcutting on stream temperatures
J.M. Bartholow
2000, Rivers (7) 284-297
The Stream Segment Temperature Model was used to estimate cumulative effects of large-scale timber harvest on stream temperature. Literature values were used to create parameters for the model for two hypothetical situations, one forested and the other extensively clearcut. Results compared favorably with field studies of extensive forest canopy removal....
A comparison in Colorado of three methods to monitor breeding amphibians
P.S. Corn, E. Muths, W.M. Iko
2000, Northwestern Naturalist (81) 22-30
We surveyed amphibians at 4 montane and 2 plains lentic sites in northern Colorado using 3 techniques: standardized call surveys, automated recording devices (frog-loggers), and intensive surveys including capture-recapture techniques. Amphibians were observed at 5 sites. Species richness varied from 0 to 4 species at each site. Richness scores, the...
Controls on nitrogen flux in alpine/subalpine watersheds of Colorado
Donald H. Campbell, Jill Baron, Kathy A. Tonnessen, Paul D. Brooks, Paul F. Schuster
2000, Water Resources Research (36) 37-47
High‐altitude watersheds in the Front Range of Colorado show symptoms of advanced stages of nitrogen excess, despite having less nitrogen in atmospheric deposition than other regions where watersheds retain nitrogen. In two alpine/subalpine subbasins of the Loch Vale watershed, atmospheric deposition of NO3− plus NH4+ was 3.2–5.5 kg N ha−1, and watershed...
Effect of elevation on distribution of female bats in the Black Hills, South Dakota
P.M. Cryan, M.A. Bogan, J.S. Altenbach
2000, Journal of Mammalogy (81) 719-725
Presumably, reproductive female bats are more constrained by thermoregulatory and energy needs than are males and nonreproductive females. Constraints imposed on reproductive females may limit their geographic distribution relative to other bats. Such constraints likely increase with latitude and elevation. Males of 11 bat species that inhabit the Black Hills...
Multicriteria decision analysis applied to Glen Canyon Dam
M. Flug, H.L.H. Seitz, J.F. Scott
2000, Journal of Water Resources Planning and Management (126) 270-276
Conflicts in water resources exist because river-reservoir systems are managed to optimize traditional benefits (e.g., hydropower and flood control), which are historically quantified in economic terms, whereas natural and environmental resources, including in-stream and riparian resources, are more difficult or impossible to quantify in economic terms. Multicriteria decision analysis provides...
Analytical group decision making in natural resources: Methodology and application
D. L. Schmoldt, D. L. Peterson
2000, Forest Science (46) 62-75
Group decision making is becoming increasingly important in natural resource management and associated scientific applications, because multiple values are treated coincidentally in time and space, multiple resource specialists are needed, and multiple stakeholders must be included in the decision process. Decades of social science research on decision making in groups...