Dynamics of prey moving through a predator field: a model of migrating juvenile salmon
J.H. Petersen, D.L. DeAngelis
2000, Mathematical Biosciences (165) 97-114
The migration of a patch of prey through a field of relatively stationary predators is a situation that occurs frequently in nature. Making quantitative predictions concerning such phenomena may be difficult, however, because factors such as the number of the prey in the patch, the spatial length and velocity of...
Development and evaluation of consensus-based sediment quality guidelines for freshwater ecosystems
D.D. MacDonald, C.G. Ingersoll, T.A. Berger
2000, Archives of Environmental Contamination and Toxicology (39) 20-31
Numerical sediment quality guidelines (SQGs) for freshwater ecosystems have previously been developed using a variety of approaches. Each approach has certain advantages and limitations which influence their application in the sediment quality assessment process. In an effort to focus on the agreement among these various published SQGs, consensus-based SQGs were...
Environmental contaminants in blood, hair, and tissues of ocelots from the Lower Rio Grande Valley, Texas, 1986-1997
M.A. Mora, L.L. Laack, Lee M. Clare, J. Sericano, R. Presley, P.R. Gardinali, L.R. Gamble, S. Robertson, D. Frank
2000, Environmental Monitoring and Assessment (64) 477-492
The ocelot (Felis pardalis) is an endangered neotropical cat distributed within a small range in the Lower Rio Grande Valley (LRGV), in Texas, U.S.A. Studies of the impacts of environmental contaminants in wild cats are few. Approximately one fourth of the estimated population (about 100) of ocelots in the LRGV...
Chronology and geochemistry of late Holocene eolian deposits in the Brandon Sand Hills, Manitoba, Canada
S.A. Wolfe, D.R. Muhs, P.P. David, J. P. McGeehin
2000, Quaternary International (67) 61-74
Accelerator mass spectrometry and conventional radiocarbon age determinations of organic matter from paleosols indicate that the Brandon Sand Hills area of southern Manitoba has been subjected to recurrent intervals of eolian activity in the past 5000 years. Although precise regional correlations are precluded by dating uncertainties, periods of most notable...
The disparity between extreme rainfall events and rare floods - with emphasis on the semi-arid American West
W. R. Osterkamp, Jonathan M. Friedman
2000, Hydrological Processes (14) 2817-2829
Research beginning 40 years ago suggested that semi-arid lands of the USA have higher unit discharges for a given recurrence interval than occur in other areas. Convincing documentation and arguments for this suspicion, however, were not presented. Thus, records of measured rainfall intensities for specified durations and recurrence intervals, and...
Crustal deformation associated with glacial fluctuations in the eastern Chugach Mountains, Alaska
Jeanne Sauber, George Plafker, Bruce F. Molnia, Mark A. Bryant
2000, Journal of Geophysical Research B: Solid Earth (105) 8055-8077
The changes of the solid Earth in south central Alaska in response to two major glacial fluctuations on different temporal and spatial scales have been estimated and we evaluated their influence on the stress state and ongoing tectonic deformation of the region. During the recent (1993–1995) Bering Glacier surge, a...
Reactive uptake of trace metals in the hyporheic zone of a mining- contaminated stream, Pinal Creek, Arizona
C. C. Fuller, J. W. Harvey
2000, Environmental Science & Technology (34) 1150-1155
Significant uptake of dissolved metals occurred by interaction of groundwater and surface water with hyporheic-zone sediments during transport in Pinal Creek, AZ. The extent of trace metal uptake was calculated by mass balance measurements made directly within the hyporheic zone. A conservative solute tracer injected into the...
Vendian age of enderbite from a granulite complex of the Baikal-Muya ophiolite belt, Northern Baikal Region
Yu. V. Amelin, E. Yu Rytsk, R. Sh Krymskii, L.A. Neimark, S.G. Skublov
2000, Doklady Earth Sciences (371 A) 455-457
[No abstract available]...
A late Holocene paleoecological record from Torrey Pines State Reserve, California
Kenneth L. Cole, Eugene Wahl
2000, Quaternary Research (53) 341-351
Paleoenvironments of the Torrey Pines State Reserve were reconstructed from a 3600-yr core from Los Peñasquitos Lagoon using fossil pollen, spores, charcoal, chemical stratigraphy, particle size, and magnetic susceptibility. Late Holocene sediments were radiocarbon dated, while the historical sediments were dated using sediment chemistry, fossil pollen, and historical records. At...
NASQAN: The design and implementation of a large-river suspended sediment and trace element flux programme
A. J. Horowitz
2000, Conference Paper, IAHS-AISH Publication
In 1996 the US Geological Survey (USGS) began a national flux-based water quality monitoring programme in the Mississippi, Columbia, Colorado, and Rio Grande basins. Suspended sediment flux estimates for periods greater than a year are generally accurate within ??15%. Discharge and suspended sediment concentrations varied much more than chemical levels....
Detection of gas hydrate with downhole logs and assessment of gas hydrate concentrations (saturations) and gas volumes on the Blake Ridge with electrical resistivity log data
T. S. Collett, J. Ladd
2000, Conference Paper, Proceedings of the Ocean Drilling Program: Scientific Results
Let 164 of the Ocean Drilling Program was designed to investigate the occurrence of gas hydrate in the sedimentary section beneath the Blake Ridge on the southeastern continental margin of North America. Site 994, and 997 were drilled on the Blake Ridge to refine our understanding of the in situ...
Floods, flood control, and bottomland vegetation
Jonathan M. Friedman, Gregor T. Auble
2000, Book chapter, Inland flood hazards: human, riparian and aquatic communities
Bottomland plant communities are typically dominated by the effects of floods. Floods create the surfaces on which plants become established, transport seeds and nutrients, and remove establish plants. Floods provide a moisture subsidy that allows development of bottomland forests in arid regions and produce anoxic soils, which can control bottomland...
Application of a PCR-based approach to identify sex in Hawaiian honeycreepers (Drepanidinae)
S.I. Jarvi, P.C. Banko
2000, Pacific Conservation Biology (6) 14-17
The application of molecular techniques to conservation genetics issues can provide important guidance criteria for management of endangered species. The results from this study establish that PCR-based approaches for sex determination developed in other bird species (Griffiths and Tiwari 1995; Griffiths et al. 1996, 1998; Ellegren 1996) can be applied...
Winter-spring 2001 United States streamflow probabilities based on anticipated neutral ENSO conditions and recent NPO status
M. D. Dettinger, D.R. Cayan, G. J. McCabe Jr., K.T. Redmond
2000, Experimental Long-Lead Forecast Bulletin (9) 55-60
An analysis of historical floods and seasonal streamflows during years with neutral El NiñoSouthern Oscillation (ENSO) conditions in the tropical Pacific and “negative” states of the North Pacific Oscillation (NPO) in the North Pacific—like those expected next year—indicates that (1) chances of having maximum-daily flows next year that are near...
Would ecological landscape restoration make the Bandelier Wilderness more or less of a wilderness?
C.A. Sydoriak, Craig D. Allen, Brian F. Jacobs
2000, U.S. Forest Service Proceedings RMRS-P-15-VOL-5
The purpose of this paper is to foster discussion on the basic issue of whether it is appropriate or not to intervene in designated wilderness areas that have been “trammeled by man” and, as a result, no longer retain their “primeval character and influence.” We explore this wilderness management dilemma...
Paradise confounded: the status of Alaska's instream flow program. Review of "Annual Summary of Instream Flow Reservations and Protection in Alaska" by Christopher E. Estes
Nina Burkardt
2000, Rivers (7) 361-363
No abstract available....
Exposure of delta smelt to dissolved pesticides in 1998 and 1999
G. Edward Moon, Kathryn Kuivila, Catherine A. Ruhl, David H. Schoellhamer
2000, Interagency Ecological Program Newsletter (13) 27-33
Delta smelt is a threatened species in the San Francisco Bay Estuary. Pesticide toxicity is a possible cause for the need to list this fish (Bennett and Moyle 1996; Moyle and others 1996). Numerous pesticides are transported into the estuary from area rivers (MacCoy and others 1995). However, there are...
Modeling the distributions of species and communities in Great Smoky Mountains National Park
S. Wilds, J.R. Boetsch, F.T. Van Manen, J. D. Clark, P.S. White
2000, Computers and Electronics in Agriculture (27) 389-392
No abstract available....
Effect of dietary ingredient substition on dorsal fin erosion of steelhead
W.A. Lellis, F.T. Barrows
2000, North American Journal of Aquaculture (62) 135-138
A feeding trial was conducted to determine the effect of supplementing a diet based on hydrolyzed fish meal with either 6% chitin (as ground krill shell), 6% squid meal, or 200 mg carotenoid pigment (canthaxanthin) per kilogram on dorsal fin erosion in juvenile steelhead Oncorhynchus mykiss. Three hundred fry in triplicate tanks...
Mesohabitat use of threatened hemlock forests by breeding birds of the Delaware Water Gap National Recreation Area
R. M. Ross
2000, Hemlock Woolly Adelgid Newsletter (5) 6-8
Using new video mapping technology in landscape ecology
T.J. Stohlgren, Margot W. Kaye, A.D. McCrumb, Yuka Otsuki, B. Pfister, C.A. Villa
2000, BioScience (50) 529-536
Biological and ecological monitoring continues to play an important role in the conservation of species, natural communities, and landscapes (Spellerberg 1991). Although resource-monitoring programs have advanced knowledge about natural ecosystems, weaknesses persist in our ability to rapidly transfer landscape-scale information to the public. Ecologists continue...
Distribution, movements, and habitat use of razorback sucker (Xyrauchen texanus) in a lower Colorado River Reservoir, Arizona-Nevada
G.A. Mueller, P.C. Marsh, G. Knowles, T. Wolters
2000, Western North American Naturalist (60) 180-187
Distribution, movements, and habitat use of 10 wild adult razorback suckers (Xyrauchen texanus) were examined in Lake Mohave, Arizona-Nevada, from November 1994 through July 1997. Movement rates (0.00-17.35 km d⁻¹) and ranges (x̄ = 39 km) were similar to those for riverine populations. All study fish returned to spawning sites...
Invertebrate assemblages and trace element bioaccumulation associated with constructed wetlands
S. M. Nelson, R.A. Roline, J.S. Thullen, J.J. Sartoris, J.E. Boutwell
2000, Wetlands (20) 406-415
Invertebrate assemblages were studied in eight monoculture wetland mesocosms constructed for wastewater treatment. Low concentrations of dissolved oxygen (D.O.) were measured in bulrush mesocosms while higher concentrations of D.O. were measured in open water mesocosms containing submerged pondweeds. Invertebrate taxa richness was positively related to D.O. concentrations that were, in...
Biomarker response and health of polychlorinated biphenyl- and chlordane-contaminated paddlefish from the Ohio River Basin, USA
D.T. Gunderson, R. Miller, A. Mischler, K. Elpers, S.D. Mims, J.G. Millar, V. Blazer
2000, Environmental Toxicology and Chemistry (19) 2275-2285
Fifty paddlefish (Polyodon spathula) collected from two sites on the Ohio River and from one site on the Cumberland River, USA, were examined to determine gonad polychlorinated biphenyl (PCB) and chlordane concentrations, amounts of plasma sex steroids (testosterone and estradiol), hepatic microsomal ethoxyresorufin-O-deethylase (EROD) activity, and the presence of immunoreactive...
Effects of disease, dispersal, and area on bighorn sheep restoration
J.E. Gross, F. J. Singer, M.E. Moses
2000, Restoration Ecology (8) 25-37
We simulated population dynamics of bighorn sheep (Ovis canadensis) inhabiting six discrete habitat patches in the Badlands ecosystem, South Dakota. Modeled populations were subjected to a range of potential management actions and rates of disease-causing infection. Simulated disease varied in severity from mild (∼12% mortality) to severe (∼67% mortality), with...
