Influence of fluvial processes on the quaternary geologic framework of the continental shelf, North Carolina, USA
S.K. Boss, C.W. Hoffman, B. Cooper
2002, Marine Geology (183) 45-65
Digital, single-channel, high-resolution seismic reflection profiles were acquired from the insular continental shelf of North Carolina, USA along a data grid extending from Oregon Inlet northward 48 km to Duck, North Carolina and from the nearshore zone seaward approximately 28 km (total surveyed area= 1334 km2). These data were processed...
A multiisotope C and N modeling analysis of soil organic matter turnover and transport as a function of soil depth in a California annual grassland soil chronosequence
W.T. Baisden, Ronald Amundson, D.L. Brenner, A.C. Cook, C. Kendall, J.W. Harden
2002, Global Biogeochemical Cycles (16) 82-1-82-26
We examine soil organic matter (SOM) turnover and transport using C and N isotopes in soil profiles sampled circa 1949, 1978, and 1998 (a period spanning pulse thermonuclear 14C enrichment of the atmosphere) along a 3‐million‐year annual grassland soil chronosequence. Temporal differences in soil Δ14C profiles indicate that inputs of recently...
Factors influencing the nitrification efficiency of fluidized bed filter with a plastic bead medium
S. I. Sandu, G. D. Boardman, B.J. Watten, B. L. Brazil
2002, Aquacultural Engineering (26) 41-59
The performance of fluidized bed nitrification filters charged with 2 ?? 4 ABS plastic beads (specific gravity 1.06) was evaluated. Three unique bed-height to diameter ratios were established, in triplicate, using column diameters of 12.7, 15.2 and 17.8 cm. Filters received water spiked with recycled nutrients and ammonia (TAN), from...
Sample size requirements for in situ vegetation and substrate classifications in shallow, natural Nebraska Lakes
C.P. Paukert, D.W. Willis, R.S. Holland
2002, North American Journal of Fisheries Management (22) 1329-1333
We assessed the precision of visual estimates of vegetation and substrate along transects in 15 shallow, natural Nebraska lakes. Vegetation type (submergent or emergent), vegetation density (sparse, moderate, or dense), and substrate composition (percentage sand, muck, and clay; to the nearest 10%) were estimated at 25-70 sampling sites per lake...
Ancient impact structures on modern continental shelves: The Chesapeake Bay, Montagnais, and Toms Canyon craters, Atlantic margin of North America
C. Wylie Poag, J. B. Plescia, P.C. Molzer
2002, Deep-Sea Research Part II: Topical Studies in Oceanography (49) 1081-1102
Three ancient impact craters (Chesapeake Bay - 35.7 Ma; Toms Canyon - 35.7 Ma; Montagnais - 51 Ma) and one multiring impact basin (Chicxulub - 65 Ma) are currently known to be buried beneath modern continental shelves. All occur on the passive Atlantic margin of North America in regions extensively...
Anthropogenic sources of arsenic and copper to sediments in a suburban lake, Northern Virginia
Karen C. Rice, Kathryn M. Conko, George M. Hornberger
2002, Environmental Science & Technology (36) 4962-4967
Mass balances of total arsenic and copper for a suburban lake in densely populated northern Virginia were calculated using data collected during 1998. Mass-balance terms were precipitation; stream inflow, including road runoff; stream outflow; and contributions from leaching of pressure-treated lumber. More mass of arsenic and copper was input to...
Movement and habitat use of green sturgeon Acipenser medirostris in the Rogue River, Oregon, USA
D.L. Erickson, J.A. North, J.E. Hightower, J. Weber, L. Lauck
2002, Journal of Applied Ichthyology (18) 565-569
Green sturgeon (Acipenser medirostris) movement patterns and habitat use within the Rogue River, Oregon were evaluated using radio telemetry. Nineteen specimens ranging from 154 to 225 cm total length were caught by gill netting and tagged with radio transmitters during May-July 2000. One tagged green sturgeon was verified as a...
Population dynamics of tule elk at point Reyes National Seashore, California
J. A. Howell, G. C. Brooks, M. Semenoff-Irving, C. Greene
2002, Journal of Wildlife Management (66) 478-490
The presence of locally abundant wildlife raises questions about natural regulation and ecological consequences of overpopulation. We sought to establish precise information about population size, structure, and productivity to examine the role of natural regulation in a closed tule elk (Cervus elaphus nannodes) population at Point Reyes National Seashore, California,...
Composition of cavity-nesting bird communities in montane aspen woodland fragments: The roles of landscape context and forest structure
J.J. Lawler, T.C. Edwards Jr.
2002, Condor (104) 890-896
We compared cavity-nesting bird communities in aspen (Populus tremuloides) woodland fragments classified on the basis of vegetation structure (tree density) and landscape context (surrounding vegetation). We found very few cavity nesters in fragments predominantly surrounded by forests. Fragments adjacent to meadows contained more species and a greater abundance of cavity...
Seasonal and diel habitat selection by bluegills in a shallow natural lake
C.P. Paukert, D.W. Willis
2002, Transactions of the American Fisheries Society (131) 1131-1139
Habitat use by bluegill Lepomis macrochirus may be dictated by the avoidance of predators and the availability of prey. Previous work suggests that bluegills large enough to avoid predators will select habitats based on foraging profitability. However, these studies focused on smaller fish (<150 mm standard length) in laboratory experiments...
Fish mortality and physicochemistry in a managed floodplain wetland
J. C. Sargent, David L. Galat
2002, Wetlands Ecology and Management (10) 115-121
Patterns of fish mortality and associated physicochemical factors were studied during late spring in a managed wetland canal along the lower Missouri River, Missouri. Mean dawn dissolved oxygen was lower and mean un-ionized ammonia and turbidity were higher during the fish kill than before or after the kill, or than...
Loss of sagebrush ecosystems and declining bird populations in the Intermountain West: Priority research issues and information needs
Water Resources Division, U.S. Geological Survey
2002, Fact Sheet 122-02
Sagebrush lands in the Intermountain West are declining rapidly in quality and extent. Consequently, populations of many bird species dependent on these ecosystems also are declining. The greater sage-grouse has been petitioned for listing as a threatened and endangered species, and other species of sagebrush-obligate birds have special conservation status...
Constructing event trees for volcanic crises
C. Newhall, R. Hoblitt
2002, Bulletin of Volcanology (64) 3-20
Event trees are useful frameworks for discussing probabilities of possible outcomes of volcanic unrest. Each branch of the tree leads from a necessary prior event to a more specific outcome, e.g., from an eruption to a pyroclastic flow. Where volcanic processes are poorly understood, probability estimates might be purely empirical...
New Midwestern state records of aquatic Hemiptera (Corixidae: Notonectidae)
Stephen W. Chordas III, Eric G. Chapman, Patrick L. Hudson, Margret A. Chriscinske, Richard L. Stewart Jr.
2002, Entomological News (113) 310-314
Recent aquatic Hemiptera collections have yielded 15 new state records distributed among four midwestern States. These records include two species of water boatmen (Palmacorixa gillettei and Sigara mathesoni) new for Indiana, four water boatmen species (Cenocorixa utahensis, Corisella inscripta, Hesperocorixa laevigata, S. decorata), including one genus (Cenocorixa) new for...
Information science and technology developments within the National Biological Information Infrastructure
Mike Frame, Gladys Cotter, Lisa Zolly, Janice Little
2002, Science and Technology Libraries (23) 59-72
Whether your vantage point is that of an office window or a national park, your view undoubtedly encompasses a rich diversity of life forms, all carefully studied or managed by some scientist, resource manager, or planner. A few simple calculations-the number of species, their interrelationships, and the many researchers studying...
Geometry, slip distribution, and kinematics of surface rupture on the Sakarya fault segment during the 17 August 1999 İzmit, Turkey, earthquake
R.M. Langridge, Heidi D. Stenner, T. E. Fumal, S.A. Christofferson, T. K. Rockwell, R.D. Hartleb, J. Bachhuber, A.A. Barka
2002, Bulletin of the Seismological Society of America (92) 107-125
The Mw 7.4 17 August 1999 İzmit earthquake ruptured five major fault segments of the dextral North Anatolian Fault Zone. The 26-km-long, N86°W-trending Sakarya fault segment (SFS) extends from the Sapanca releasing step-over in the west to near the town of Akyazi in the east. The SFS emerges from Lake Sapanca as...
Contaminant studies in the Sierra Nevadas
Don Sparling, Gary M. Fellers
2002, People, Land, and Water 33
1. 1. Barred owls fed at a sub-maintenance (SM) level had significantly (P < 0.01) longer meal to pellet intervals (MPI)/g eaten/kg body weight (BW) than those fed at an above maintenance (AM) level; MPI/g per kg for owls fed at a maintenance (M) level was intermediate but significantly (P...
Remotely sensed geology from lander-based to orbital perspectives: Results of FIDO rover May 2000 field tests
B. Jolliff, A. Knoll, R.V. Morris, J. Moersch, H. McSween, M. Gilmore, R. Arvidson, R. Greeley, Kenneth E. Herkenhoff, S. Squyres
2002, Journal of Geophysical Research E: Planets (107)
Blind field tests of the Field Integration Design and Operations (FIDO) prototype Mars rover were carried out 7-16 May 2000. A Core Operations Team (COT), sequestered at the Jet Propulsion Laboratory without knowledge of test site location, prepared command sequences and interpreted data acquired by the rover. Instrument sensors included...
Conventional U-Pb dating versus SHRIMP of the Santa Barbara Granite Massif, Rondonia, Brazil
I. Sparrenberger, Jorge S. Bettencourt, R. M. Tosdal, J. L. Wooden
2002, Geologia USP - Serie Cientifica (2) 79-94
The Santa Ba??rbara Granite Massif is part of the Younger Granites of Rondo??nia (998 - 974 Ma) and is included in the Rondo??nia Tin Province (SW Amazonian Craton). It comprises three highly fractionated metaluminous to peraluminous within-plate A-type granite units emplaced in older medium-grade metamorphic rocks. Sn-mineralization is closely associated...
Fragmentation: Is the message clear?
J.A. Bissonette, Ilse Storch
2002, Ecology and Society (6)
In this paper, we briefly discuss some of the fundamental problems arising from the inherent complexity of larger-scale ecological systems. We examine the tenuous assumption of a direct correspondence between ecological data and theory, we comment on a recent report that evaluated the efficacy of fragmentation experiments, and we briefly...
Monitoring of Lost River and shortnose suckers at the Sprague River Dam fish ladder, Oregon
E.C. Janney, R.S. Shively, B.S. Hayes, T.J. Tyler, G.N. Blackwood
2002, Report
Abstract not available ...
Rocky Mountain futures: An ecological perspective
Jill Baron, editor(s)
2002, Book
The Rocky Mountain West is largely arid and steep, with ecological scars from past human use visible for hundreds of years. Just how damaging were the past 150 years of activity? How do current rates of disturbance compare with past mining, grazing, and water diversion activities? In the face of...
Gila trout - genetic broodstock management plan
H. L. Kincaid, R. Reisenbichler
2002, Report
Abstract not available ...
Studies on the detection, transmission, and development of Renibacterium salmoninarum infections in Great Lakes salmonid fishes. Report for June-September 2002.
R.J. Pascho, D.G. Elliott
2002, Report
Abstract not available ...
A new genus of alien grass discovered in Hawai‘i: Oryzopsis (Poaceae)
Steve J. Dougill, Paul C. Banko
2002, Newsletter of the Hawaiian Botanical Society (41)
No abstract available....
