Identification of linear and threshold responses in streams along a gradient of urbanization in Anchorage, Alaska
Robert T. Ourso, S.A. Frenzel
2003, Hydrobiologia (501) 117-131
We examined biotic and physiochemical responses in urbanized Anchorage, Alaska, to the percent of impervious area within stream basins, as determined by high-resolution IKONOS satellite imagery and aerial photography. Eighteen of the 86 variables examined, including riparian and instream habitat, macroinvertebrate communities, and water/sediment chemistry, were significantly correlated with percent...
Hilbert-Huang transform analysis of dynamic and earthquake motion recordings
R.R. Zhang, S. Ma, E. Safak, S. Hartzell
2003, Journal of Engineering Mechanics (129) 861-875
This study examines the rationale of Hilbert-Huang transform (HHT) for analyzing dynamic and earthquake motion recordings in studies of seismology and engineering. In particular, this paper first provides the fundamentals of the HHT method, which consist of the empirical mode decomposition (EMD) and the Hilbert spectral analysis. It then uses...
Relative contribution of stocked walleyes in Tennessee reservoirs
C.S. Vandergoot, P.W. Bettoli
2003, North American Journal of Fisheries Management (23) 1036-1041
Since the mid-1950s, fisheries biologists with the Tennessee Wildlife Resources Agency have stocked walleyes Stizostedion vitreum in several tributary reservoirs of the Cumberland and Tennessee rivers to augment declining native stocks; however, the efficacy of these management actions has never been formally evaluated. The contribution of stocked walleyes in four...
Discharge indices for water quality loads
Richard M. Vogel, Jery R. Stedinger, Richard P. Hooper
2003, Water Resources Research (39) 1-1-1-9
Effective discharge has been used to describe the streamflow level that is responsible for transporting the most sediment over the long term. Careful inspection reveals that this concept may not have been well defined, and different interpretations have led to conflicting representations. Because total load is ultimately the quantity of...
An adenovirus linked to mortality and disease in long-tailed ducks (Clangula hyemalis) in Alaska
Tuula E. Hollmén, J. C. Franson, Paul L. Flint, J.B. Grand, Richard B. Lanctot, D. E. Docherty, H.M. Wilson
2003, Avian Diseases (47) 1434-1440
An adenovirus was isolated from intestinal samples of two long-tailed ducks (Clangula hyemalis) collected during a die-off in the Beaufort Sea off the north coast of Alaska in 2000. The virus was not neutralized by reference antiserum against known group I, II, or III avian adenoviruses and may represent a...
Managing a subsidized predator population: Reducing common raven predation on desert tortoises
W.I. Boarman
2003, Environmental Management (32) 205-217
Human communities often are an inadvertent source of food, water, and other resources to native species of wildlife. Because these resources are more stable and predictable than those in a natural environment, animals that subsist on them are able to increase in numbers and expand their range, much to the...
Chemical and isotopic properties of kukersites from Iowa and Estonia
Maria Mastalerz, A. Schimmelmann, J.C. Hower, G. Lis, J. Hatch, S.R. Jacobson
2003, Organic Geochemistry (34) 1419-1427
Kukersite samples from Estonia and Iowa were analyzed for elemental composition, functional group distribution, and carbon and hydrogen stable isotope ratios. The elemental and hydrogen isotope values, together with other analytical data, suggest a higher thermal maturity for the Iowa kukersite. The wide carbon isotopic range of 9.3??? among kukersites,...
To the National Map and beyond
J. Kelmelis
2003, Cartography and Geographic Information Science (30) 185-198
Scientific understanding, technology, and social, economic, and environmental conditions have driven a rapidly changing demand for geographic information, both digital and analog. For more than a decade, the U.S. Geological Survey (USGS) has been developing innovative partnerships with other government agencies and private industry to produce and distribute geographic information...
Clay-mineral suites, sources, and inferred dispersal routes: Southern California continental shelf
J.R. Hein, J.S. Dowling, A. Schuetze, H.J. Lee
2003, Marine Environmental Research (56) 79-102
Clay mineralogy is useful in determining the distribution, sources, and dispersal routes of fine-grained sediments. In addition, clay minerals, especially smectite, may control the degree to which contaminants are adsorbed by the sediment. We analyzed 250 shelf sediment samples, 24 river-suspended-sediment samples, and 12 river-bed samples for clay-mineral contents in...
Application of a multipurpose unequal probability stream survey in the Mid-Atlantic Coastal Plain
S.W. Ator, A.R. Olsen, A.M. Pitchford, J. M. Denver
2003, Journal of the American Water Resources Association (39) 873-885
A stratified, spatially balanced sample with unequal probability selection was used to design a multipurpose survey of headwater streams in the Mid-Atlantic Coastal Plain. Objectives for the survey include unbiased estimates of regional stream conditions, and adequate coverage of unusual but significant environmental settings to support empirical modeling of the...
The influence of gender on the relationship between wildlife value orientations, beliefs, and the acceptability of lethal deer control in Cuyahoga Valley National Park
E.M. Dougherty, D.C. Fulton, D.H. Anderson
2003, Society and Natural Resources (16) 603-623
This study examines how wildlife value orientations, attitudes, and gender influence acceptance of lethal actions to control deer in Cuyahoga Valley National Park in Ohio. Data were collected from female and male residents (n = 659) in a nine-county area, the primary service area of the park. Females and males...
Habitat association, size, stomach contents, and reproductive condition of Puerto Rican boas (Epicrates inornatus)
J. W. Wiley
2003, Caribbean Journal of Science (39) 189-194
The Puerto Rican boa occurs in a variety of habitats, including wet montane forest, lowland wet forest, mangrove forest, wet limestone karst, and offshore cays, and from sea level to 480 m. Mean SVL of 49 encountered boas (live and road-killed) was 136.9 ?? 35.1 (range = 38.8-205 cm), with...
Some observations on colocated and closely spaced strong ground-motion records of the 1999 Chi-Chi, Taiwan, earthquake
G.-Q. Wang, D.M. Boore, H. Igel, X.-Y. Zhou
2003, Bulletin of the Seismological Society of America (93) 674-693
The digital accelerograph network installed in Taiwan produced a rich set of records from the 20 September 1999 Chi-Chi, Taiwan earthquake (Mw 7.6). Teledyne Geotech model A-800 and A-900A* digital accelerographs were colocated at 22 stations that recorded this event. Comparisons of the amplitudes, frequency content, and baseline offsets show...
A Visual Basic program to classify sediments based on gravel-sand-silt-clay ratios
L.J. Poppe, A.H. Eliason, M. E. Hastings
2003, Computers & Geosciences (29) 805-809
Nomenclature describing size distributions is important to geologists because grain size is the most basic attribute of sediments. Traditionally, geologists have divided sediments into four size fractions that include gravel, sand, silt, and clay, and classified these sediments based on ratios of the various proportions of the fractions. Definitions of...
Development of a multimetric index for assessing the biological condition of the Ohio River
E.B. Emery, T.P. Simon, F.H. McCormick, P. L. Angermeier, J.E. Deshon, C.O. Yoder, R.E. Sanders, W.D. Pearson, G.D. Hickman, R.J. Reash, J.A. Thomas
2003, Transactions of the American Fisheries Society (132) 791-808
The use of fish communities to assess environmental quality is common for streams, but a standard methodology for large rivers is as yet largely undeveloped. We developed an index to assess the condition of fish assemblages along 1,580 km of the Ohio River. Representative samples of fish assemblages were collected...
Fault trends on the seaward slope of the Aleutian Trench: Implications for a laterally changing stress field tied to a westward increase in oblique convergence
C. A. Mortera-Gutierrez, D.W. Scholl, R.L. Carlson
2003, Journal of Geophysical Research B: Solid Earth (108)
Normal faults along the seaward trench slope (STS) commonly strike parallel to the trench in response to bending of the oceanic plate into the subduction zone. This is not the circumstance for the Aleutian Trench, where the direction of convergence gradually changes westward, from normal to transform motion. GLORIA side-scan...
Coexistence in a multispecies assemblage of eagles in central Asia
T.E. Katzner, E. A. Bragin, S.T. Knick, A.T. Smith
2003, Condor (105) 538-551
We evaluated factors that permit species coexistence in an exceptional assemblage of similar raptor species at the Naurzum Zapovednik (a national nature reserve) in north-central Kazakhstan. White-tailed Sea-Eagle (Haliaeetus albicilla), Imperial Eagle (Aquila heliaca), Golden Eagle (A. chrysaetos), and Steppe Eagle (A. nipalensis) all breed at the Zapovednik. Steppe Eagle...
Exhumation of high-pressure rocks beneath the Solund Basin, Western Gneiss Region of Norway
B. R. Hacker, T.B. Andersen, D.B. Root, L. Mehl, J.M. Mattinson, J. L. Wooden
2003, Journal of Metamorphic Geology (21) 613-629
The Solund-Hyllestad-Lavik area affords an excellent opportunity to understand the ultrahigh-pressure Scandian orogeny because it contains a near-complete record of ophiolite emplacement, high-pressure metamorphism and large-scale extension. In this area, the Upper Allochthon was intruded by the c. 434 Ma Sogneskollen granodiorite and thrust eastward over the Middle/Lower Allochthon, probably...
Lithofacies control in detrital zircon provenance studies: Insights from the Cretaceous Methow basin, southern Canadian Cordillera
K. DeGraaff-Surpless, J. B. Mahoney, J. L. Wooden, M.O. McWilliams
2003, Geological Society of America Bulletin (115) 899-915
High-frequency sampling for detrital zircon analysis can provide a detailed record of fine-scale basin evolution by revealing the temporal and spatial variability of detrital zircon ages within clastic sedimentary successions. This investigation employed detailed sampling of two sedimentary successions in the Methow/Methow-Tyaughton basin of the southern Canadian Cordillera to characterize...
Molecular epidemiology of infectious hematopoietic necrosis virus reveals complex virus traffic and evolution within southern Idaho aquaculture
R.M. Troyer, Gael Kurath
2003, Diseases of Aquatic Organisms (55) 175-185
Infectious hematopoietic necrosis virus (IHNV) is a rhabdovirus which infects salmon and trout and may cause disease with up to 90% mortality. In the Hagerman Valley of Idaho, IHNV is endemic or epidemic among numerous fish farms and resource mitigation hatcheries. A previous study characterizing the genetic diversity among 84...
Vitality and chemistry of roots of red spruce in forest floors of stands with a gradient of soil Al/Ca ratios in the northeastern United States
P.M. Wargo, K. Vogt, D. Vogt, Q. Holifield, J. Tilley, G. Lawrence, M. David
2003, Canadian Journal of Forest Research (33) 635-652
Number of living root tips per branch, percent dead roots, percent mycorrhizae and mycorrhizal morphotype, response of woody roots to wounding and colonization by fungi, and concentrations of starch, soluble sugars, phenols, percent C and N and C/N ratio, and Al Ca, Fe, K, Mg, Mn, and P were measured...
Baseflow and stormflow metal fluxes from two small agricultural catchments in the Coastal Plain of the Chesapeake Bay Basin, United States
C.V. Miller, G.D. Foster, B.F. Majedi
2003, Applied Geochemistry (18) 483-501
Annual yields (fluxes per unit area) of Al, Mn, Fe, Ni, Cd, Pb, Zn, Cu, Cr, Co, As and Se were estimated for two small non-tidal stream catchments on the Eastern Shore of the Chesapeake Bay, United States - a poorly drained dissected-upland watershed in the Nanticoke River Basin, and...
An evaluation of selective feeding by three age-groups of the rainbow mussel Villosa iris
K. Beck, R. J. Neves
2003, North American Journal of Aquaculture (65) 203-209
A tri-algal diet was fed to three age-groups of the rainbow mussel Villosa iris: ages 2-3 d, 50-53 d, and 3-6 years. Changes in the relative abundance of each algal species were determined in 5-h feeding trials from feeding chambers and by gut content analyses. All age-groups rejected Scenedesmus quadricauda...
Phylogeography of Canada Geese (Branta canadensis) in western North America
Kim T. Scribner, Sandra L. Talbot, John M. Pearce, Barbara J. Pierson, K.S. Bollinger, Dirk V. Derksen
2003, The Auk (120) 889-907
Using molecular genetic markers that differ in mode of inheritance and rate of evolution, we examined levels and partitioning of genetic variation for seven nominal subspecies (11 breeding populations) of Canada Geese (Branta canadensis) in western North America. Gene trees constructed from mtDNA control region sequence data show that subspecies...
Gyrfalcon diet in central west Greenland during the nesting period
T.L. Booms, M.R. Fuller
2003, Condor (105) 528-537
We studied food habits of Gyrfalcons (Falco rusticolus) nesting in central west Greenland in 2000 and 2001 using three sources of data: time-lapse video (3 nests), prey remains (22 nests), and regurgitated pellets (19 nests). These sources provided different information describing the diet during the nesting period. Gyrfalcons relied heavily...
