Mangrove recruitment after forest disturbance is facilitated by herbaceous species in the Caribbean
K.L. McKee, J.E. Rooth, Ilka C. Feller
2007, Ecological Applications (17) 1678-1693
Plant communities along tropical coastlines are often affected by natural and human disturbances, but little is known about factors influencing recovery. We focused on mangrove forests, which are among the most threatened ecosystems globally, to examine how facilitation by herbaceous vegetation might improve forest restoration after disturbance. We specifically investigated...
Analysis of otolith microstructure for Cedar River Chinook salmon
A. Lind-Null, K. Larsen, R. Reisenbichler
2007, Report
No abstract available ...
Holocene slip rate and revised characteristic earthquake parameters for the western segment of the Castle Mountain fault, Alaska
Julie B. Willis, Peter J. Haeussler, Ronald L. Bruhn, Grant C. Willis
2007, Bulletin of the Seismological Society of America (97) 1019-1024
The western segment of the Castle Mountain fault poses a significant seismic hazard to the most populated region of south-central Alaska. We identify a previously unrecognized margin of a postglacial outwash channel that is offset right laterally 36 ± 4 m across the western segment of the Castle Mountain fault....
Spawning migration movements of Klamath largescale, Lost River, and shortnose suckers in the Williamson and Sprague rivers, Oregon, prior to the removal of Chiloquin Dam. Annual report 2006
C.M. Ellsworth, C.D. Luton, T.J. Tyler, S. P. VanderKooi, R.S. Shively
2007, Report
No abstract available ...
The National Elevation Dataset
D.B. Gesch
D. Maune, editor(s)
2007, Book chapter, Digital elevation model technologies and applications—the DEM users manual
No abstract available....
Near-shore and offshore habitat use by endangered, juvenile Lost River and shortnose suckers in Upper Klamath Lake, Oregon. Annual report 2004
H.A. Hendrixson, B.L Herring, S. M. Burdick, S. P. VanderKooi
2007, Report
No abstract available ...
Mammal inventories for eight National Parks in the Southern Colorado Plateau Network
Michael A. Bogan, Keith Geluso, Shauna Haymond, Ernest W. Valdez
2007, Natural Resource Technical Report NPS/SCPN/NRTR-2007/054
Historically, the Colorado Plateau has been the subject of many geological and biological explorations. J. W. Powell explored and mapped the canyon country of the Colorado River in 1869 (Powell 1961). C. H. Merriam, V. Bailey, M. Cary, and other employees of the Bureau of Biological Survey conducted biological explorations...
Effect of tidal fluctuations on contaminant transfer to the ocean
I.L. Licata, C.D. Langevin, A.M. Dausman
2007, Conference Paper, IAHS-AISH Publication
Variable-density groundwater flow was simulated to examine the effects that tide has on the coastward migration of a contaminant through a freshwater/saltwater interface and toward a coastal ocean boundary. Simulated ocean tides did not significantly affect the total contaminant mass input to the ocean; however, the difference in tidal and...
Remaining uncertainties in the use of Rn-222 as a quantitative tracer of submarine groundwater discharge
W. C. Burnett, I.R. Santos, Y. Weinstein, P.W. Swarzenski, B. Herut
2007, Conference Paper, IAHS-AISH Publication
Research performed in many locations over the past decade has shown that radon is an effective tracer for quantifying submarine groundwater discharge (SGD). The technique works because both fresh and saline groundwaters acquire radon from the subterranean environment and display activities that are typically orders of magnitude greater than those...
A comparison of shoreline seines with fyke nets for sampling littoral fish communities in floodplain lakes
S.J. Clark, J.R. Jackson, S.E. Lochmann
2007, North American Journal of Fisheries Management (27) 676-680
We compared shoreline seines with fyke nets in terms of their ability to sample fish species in the littoral zone of 22 floodplain lakes of the White River, Arkansas. Lakes ranged in size from less than 0.5 to 51.0 ha. Most contained large amounts of coarse woody debris within the...
Generating an image of dispersive energy by frequency decomposition and slant stacking
J. Xia, Y. Xu, R. D. Miller
2007, Pure and Applied Geophysics (164) 941-956
We present a new algorithm for calculating an image of dispersive energy in the frequency-velocity (f-v) domain. The frequency decomposition is first applied to a shot gather in the offset-time domain to stretch impulsive data into pseudo-vibroseis data or frequency-swept data. Because there is a deterministic relationship between frequency and...
Statistical analysis of water-quality data containing multiple detection limits II: S-language software for nonparametric distribution modeling and hypothesis testing
L. Lee, D. Helsel
2007, Computers & Geosciences (33) 696-704
Analysis of low concentrations of trace contaminants in environmental media often results in left-censored data that are below some limit of analytical precision. Interpretation of values becomes complicated when there are multiple detection limits in the data-perhaps as a result of changing analytical precision over time. Parametric and semi-parametric methods,...
Daily foraging patterns of adult Double-crested Cormorants during the breeding season
J.T.H. Coleman, M. E. Richmond
2007, Waterbirds (30) 189-198
We recorded the daily presence of Double-crested Cormorants (Phalacrocorax auritus) at the nesting island on Oneida Lake, New York, by monitoring the activities of 15 radio-tagged adults from July through September, 2000, using an automated data-logging receiver. A total of 24,464 acceptable detections was obtained for adult cormorants actively attempting...
Stream ecosystem response to limestone treatment in acid impacted watersheds of the allegheny plateau
S.E. McClurg, J.T. Petty, P. M. Mazik, J.L. Clayton
2007, Ecological Applications (17) 1087-1104
Restoration programs are expanding worldwide, but assessments of restoration effectiveness are rare. The objectives of our study were to assess current acid-precipitation remediation programs in streams of the Allegheny Plateau ecoregion of West Virginia (USA), identify specific attributes that could and could not be fully restored, and quantify temporal trends...
Regional magnetic anomalies, crustal strength, and the location of the northern Cordilleran fold-and-thrust belt
R. W. Saltus, T. L. Hudson
2007, Geology (35) 567-570
The northern Cordilleran fold-and-thrust belt in Canada and Alaska is at the boundary between the broad continental margin mobile belt and the stable North American craton. The fold-and-thrust belt is marked by several significant changes in geometry: cratonward extensions in the central Yukon Territory and northeastern Alaska are separated by...
Young cumulate complex beneath Veniaminof caldera, Aleutian arc, dated by zircon in erupted plutonic blocks
C. R. Bacon, T.W. Sison, F.K. Mazdab
2007, Geology (35) 491-494
Mount Veniaminof volcano, Alaska Peninsula, provides an opportunity to relate Quaternary volcanic rocks to a coeval intrusive complex. Veniaminof erupted tholeiitic basalt through dacite in the past ∼260 k.y. Gabbro, diorite, and miarolitic granodiorite blocks, ejected 3700 14C yr B.P. in the most recent...
A new comprehensive approach to characterizing carbonaceous aerosol with an application to wintertime Fresno, California PM2.5
P. Herckes, J.A. Leenheer, J.L. Collett Jr.
2007, Atmospheric Chemistry and Physics Discussions (7) 8423-8453
Fine particulate matter (PM2.5) samples were collected during a three week winter period in Fresno (CA). A composite sample was characterized by isolating several distinct fractions and characterizing them by infrared and nuclear magnetic resonance (NMR) spectroscopy. More than 80% of the organic matter in the aerosol samples was recovered...
Potential strategies for recovery of lake whitefish and lake herring stocks in eastern Lake Erie
K. Oldenburg, M.A. Stapanian, P.A. Ryan, E. Holm
2007, Journal of Great Lakes Research (33) 46-58
Lake Erie sustained large populations of ciscoes (Salmonidae: Coregoninae) 120 years ago. By the end of the 19th century, abundance of lake whitefish (Coregonus clupeaformis) had declined drastically. By 1925, the lake herring (a cisco) population (Coregonus artedii) had collapsed, although a limited lake herring fishery persisted in the eastern basin until...
Seasonal variations in modern speleothem calcite growth in Central Texas, U.S.A
J.L. Banner, A. Guilfoyle, E.W. James, L.A. Stern, M. Musgrove
2007, Journal of Sedimentary Research (77) 615-622
Variations in growth rates of speleothem calcite have been hypothesized to reflect changes in a range of paleoenvironmental variables, including atmospheric temperature and precipitation, drip-water composition, and the rate of soil CO2 delivery to the subsurface. To test these hypotheses, we quantified growth rates of modern speleothem calcite on artificial...
Balancing data sharing requirements for analyses with data sensitivity
C. S. Jarnevich, J.J. Graham, G.J. Newman, A.W. Crall, T.J. Stohlgren
2007, Biological Invasions (9) 597-599
Data sensitivity can pose a formidable barrier to data sharing. Knowledge of species current distributions from data sharing is critical for the creation of watch lists and an early warning/rapid response system and for model generation for the spread of invasive species. We have created an on-line system to synthesize...
Factors associated with sources, transport, and fate of volatile organic compounds and their mixtures in aquifers of the United States
P. J. Squillace, M.J. Moran
2007, Environmental Science & Technology (41) 2123-2130
Factors associated with sources, transport, and fate of volatile organic compounds (VOCs) in groundwater from aquifers throughout the United States were evaluated using statistical methods. Samples were collected from 1631 wells throughout the conterminous United States between 1996 and 2002 as part of the National Water-Quality Assessment (NAWQA) Program of...
Evidence of feline immunodeficiency virus, feline leukemia virus, and Toxoplasma gondii in feral cats on Mauna Kea, Hawaii
R.M. Danner, Dan M. Goltz, S.C. Hess, P.C. Banko
2007, Journal of Wildlife Diseases (43) 315-318
We determined prevalence to feline immunodeficiency virus (FIV) antibodies, feline leukemia virus (FeLV) antigen, and Toxoplasma gondii antibodies in feral cats (Felis catus) on Mauna Kea Hawaii from April 2002 to May 2004. Six of 68 (8.8%) and 11 of 68 (16.2%) cats were antibody positive to FIV and antigen...
Groundwater noble gas, age, and temperature signatures in an Alpine watershed: Valuable tools in conceptual model development
Andrew H. Manning, Jonathan S. Caine
2007, Water Resources Research (43)
Bedrock groundwater in alpine watersheds is poorly understood, mainly because of a scarcity of wells in alpine settings. Groundwater noble gas, age, and temperature data were collected from springs and wells with depths of 3–342 m in Handcart Gulch, an alpine watershed in Colorado. Temperature profiles indicate active groundwater circulation...
Chemical contaminants in fish feeds used in federal salmonid hatcheries in the USA
A.G. Maule, A.L. Gannam, J.W. Davis
2007, Chemosphere (67) 1308-1315
Recent studies have demonstrated that fish feeds contain significant concentrations of contaminants, many of which can bioaccumulate and bioconcentrate in fish. Organochlorine (OC) contaminants are present in the fish oils and fish meals used in feed manufacture, and some researchers speculate that all fish feeds contain measurable levels of some...
Assessing the concentration, speciation, and toxicity of dissolved metals during mixing of acid-mine drainage and ambient river water downstream of the Elizabeth Copper Mine, Vermont, USA
Laurie S. Balistrieri, R.R. Seal II, N.M. Piatak, B. Paul
2007, Applied Geochemistry (22) 930-952
The authors determine the composition of a river that is impacted by acid-mine drainage, evaluate dominant physical and geochemical processes controlling the composition, and assess dissolved metal speciation and toxicity using a combination of laboratory, field and modeling studies. Values of pH increase from 3.3 to 7.6 and the sum...
