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...
Prediction of lethal/effective concentration/dose in the presence of multiple auxiliary covariates and components of variance
S. Gutreuter, M.A. Boogaard
2007, Environmental Toxicology and Chemistry (26) 1978-1986
Predictors of the percentile lethal/effective concentration/dose are commonly used measures of efficacy and toxicity. Typically such quantal-response predictors (e.g., the exposure required to kill 50% of some population) are estimated from simple bioassays wherein organisms are exposed to a gradient of several concentrations of a single agent. The toxicity of...
Organic contaminants in onsite wastewater treatment systems
K.E. Conn, R.L. Siegrist, L. B. Barber, G.K. Brown
2007, Conference Paper, ASABE - Individual and Small Community Sewage Systems XI, Proceedings of the 11th National Symposium
Wastewater from thirty onsite wastewater treatment systems was sampled during a reconnaissance field study to quantify bulk parameters and the occurrence of organic wastewater contaminants including endocrine disrupting compounds in treatment systems representing a variety of wastewater sources and treatment processes and their receiving environments. Bulk parameters ranged in concentrations...
Effects of habitat management treatments on plant community composition and biomass in a Montane wetland
Jane E. Austin, Janet R. Keough, W.H. Pyle
2007, Wetlands (27) 570-587
Grazing and burning are commonly applied practices that can impact the diversity and biomass of wetland plant communities. We evaluated the vegetative response of wetlands and adjacent upland grasslands to four treatment regimes (continuous idle, fall prescribed burning followed by idle, annual fall cattle grazing, and rotation of summer grazing...
Annual modulation of seismicity along the San Andreas Fault near Parkfield, CA
L.B. Christiansen, Shaul Hurwitz, Steven E. Ingebritsen
2007, Geophysical Research Letters (34)
We analyze seismic data from the San Andreas Fault (SAF) near Parkfield, California, to test for annual modulation in seismicity rates. We use statistical analyses to show that seismicity is modulated with an annual period in the creeping section of the fault and a semiannual period in the locked section...
Hydrologic response of the Crow Wing Watershed, Minnesota, to mid-Holocene climate change
M. Person, P. Roy, H. Wright, W. Gutowski Jr., E. Ito, T. Winter, D. Rosenberry, D. Cohen
2007, Geological Society of America Bulletin (119) 363-376
In this study, we have integrated a suite of Holocene paleoclimatic proxies with mathematical modeling in an attempt to obtain a comprehensive picture of how watersheds respond to past climate change. A three-dimensional surface-water-groundwater model was developed to assess the effects of mid-Holocene climate change on water resources within the...
Subaqueous geology and a filling model for Crater Lake, Oregon
M. Nathenson, C. R. Bacon, D.W. Ramsey
2007, Hydrobiologia (574) 13-27
Results of a detailed bathymetric survey of Crater Lake conducted in 2000, combined with previous results of submersible and dredge sampling, form the basis for a geologic map of the lake floor and a model for the filling of Crater Lake with water. The most prominent landforms beneath the surface...
Effect of glyphosate rate and spray volume on control of giant Salvinia
L.S. Nelson, L.M. Glomski, D.N. Gladwin
2007, Journal of Aquatic Plant Management (45) 58-61
[No abstract available]...
Monitoring of Lost River (Deltistes luxatus) and shortnose (Chasmistes brevirostris) suckers in Gerber and Clear Lake reservoirs 2005-2006
P.M. Barry, B.S. Hayes, E.C. Janney, R.S. Shively, A.C. Scott, C.D. Luton
2007, Report
n/a...
Time-optimum packet scheduling for many-to-one routing in wireless sensor networks
W.-Z. Song, F. Yuan, R. LaHusen, B. Shirazi
2007, International Journal of Parallel, Emergent and Distributed Systems (22) 355-370
This paper studies the wireless sensor networks (WSN) application scenario with periodical traffic from all sensors to a sink. We present a time-optimum and energy-efficient packet scheduling algorithm and its distributed implementation. We first give a general many-to-one packet scheduling algorithm for wireless networks, and then prove that it is...
Scaling field data to calibrate and validate moderate spatial resolution remote sensing models
A. Baccini, M. A. Friedl, C. E. Woodcock, Z. Zhu
2007, Photogrammetric Engineering and Remote Sensing (73) 945-954
Validation and calibration are essential components of nearly all remote sensing-based studies. In both cases, ground measurements are collected and then related to the remote sensing observations or model results. In many situations, and particularly in studies that use moderate resolution remote sensing, a mismatch exists between the sensor’s field...
The relationship between tree growth patterns and likelihood of mortality: A study of two tree species in the Sierra Nevada
A.J. Das, J. J. Battles, N.L. Stephenson, P. J. van Mantgem
2007, Canadian Journal of Forest Research (37) 580-597
We examined mortality of Abies concolor (Gord. & Glend.) Lindl. (white fir) and Pinus lambertiana Dougl. (sugar pine) by developing logistic models using three growth indices obtained from tree rings: average growth, growth trend, and count of abrupt growth declines. For P. lambertiana, models with average growth, growth trend, and count...
A comparison of protocols and observer precision for measuring physical stream attributes
H.W. Whitacre, B.B. Roper, J. L. Kershner
2007, Journal of the American Water Resources Association (43) 923-937
Stream monitoring programs commonly measure physical attributes to assess the effect of land management on stream habitat. Variability associated with the measurement of these attributes has been linked to a number of factors, but few studies have evaluated variability due to differences in protocols. We compared six protocols, five used...
Mercury and drought along the lower Carson River, Nevada: I. Snowy egret and black-crowned night-heron annual exposure to mercury, 1997-2006
Charles J. Henny, E. F. Hill, R. A. Grove, J. L. Kaiser
2007, Archives of Environmental Contamination and Toxicology (53) 269-280
The dynamic nature of the annual volume of water discharged down the Carson River over a 10-year period, which included a century flood and drought, was examined in order to gain a better understanding of mercury movement, biological availability, and exposure to waterbirds nesting at Lahontan Reservoir. Total annual water...
Sexual selection drives speciation in an Amazonian frog
K.E. Boul, W.C. Funk, C.R. Darst, D.C. Cannatella, M.J. Ryan
2007, Proceedings of the Royal Society B: Biological Sciences (274) 399-406
One proposed mechanism of speciation is divergent sexual selection, whereby divergence in female preferences and male signals results in behavioural isolation. Despite the appeal of this hypothesis, evidence for it remains inconclusive. Here, we present several lines of evidence that sexual selection is driving behavioural isolation and speciation among populations...
Persistent mortality of brook trout in episodically acidified streams of the Southwestern Adirondack Mountains, New York
Barry P. Baldigo, G. Lawrence, H. Simonin
2007, Transactions of the American Fisheries Society (136) 121-134
Water chemistry, discharge, and mortality of caged brook trout Salvelinus fontinalis were characterized in six headwater streams in the southwestern Adirondack Mountains of New York during spring 2001-2003. Results were compared with mortality recorded during similar tests during 1984-1985, 1988-1990, and 1997 to assess contemporary relations between stream acidification and...
Sources of speciated atmospheric mercury at a residential neighborhood impacted by industrial sources
H. Manolopoulos, D.C. Snyder, James J Schauer, J.S. Hill, J.R. Turner, Mark L. Olson, David P. Krabbenhoft
2007, Environmental Science & Technology (41) 5626-5633
Speciated measurements of atmospheric mercury plumes were obtained at an industrially impacted residential area of East St. Louis, IL. These plumes were found to result in extremely high mercury concentrations at ground level that were composed of a wide distribution of mercury species. Ground level concentrations as high as 235...
Cryovolcanic features on Titan's surface as revealed by the Cassini Titan Radar Mapper
Rosaly Lopes, K. L. Mitchell, Ellen R. Stofan, Jonathan I. Lunine, Ralf D. Lorenz, F. Paganelli, Randolph L. Kirk, C. A. Wood, Stephen D. Wall, L.E. Robshaw, A.D. Fortes, Catherine D. Neish, Jani Radebaugh, E. Reffet, S.J. Ostro, Charles Elachi, M.D. Allison, Y. Anderson, R. Boehmer, G. Boubin, Philip S. Callahan, P. Encrenaz, E. Flamini, G. Francescetti, Y. Gim, G. Hamilton, S. Hensley, Michael A. Janssen, W.T.K. Johnson, K. Kelleher, D.O. Muhleman, G. Ori, R. Orosei, G. Picardi, F. Posa, L.E. Roth, R. Seu, S. Shaffer, Laurence A. Soderblom, B. Stiles, S. Vetrella, R.D. West, L. Wye, H. A. Zebker
2007, Icarus (186) 395-412
The Cassini Titan Radar Mapper obtained Synthetic Aperture Radar images of Titan's surface during four fly-bys during the mission's first year. These images show that Titan's surface is very complex geologically, showing evidence of major planetary geologic processes, including cryovolcanism. This paper discusses the variety of cryovolcanic features identified from...
Sediment compaction rates and subsidence in deltaic plains: Numerical constraints and stratigraphic influences
T.A. Meckel, Uri S. ten Brink, S.J. Williams
2007, Basin Research (19) 19-31
Natural sediment compaction in deltaic plains influences subsidence rates and the evolution of deltaic morphology. Determining compaction rates requires detailed knowledge of subsurface geotechnical properties and depositional history, neither of which is often readily available. To overcome this lack of knowledge, we numerically forward model the incremental sedimentation and compaction...
Fish assemblages of the upper Little Sioux River basin, Iowa, USA: Relationships with stream size and comparison with historical assemblages
D. Palic, L. Helland, B.R. Pedersen, J.R. Pribil, R.M. Grajeda, Anna Loan-Wilsey, C.L. Pierce
2007, Journal of Freshwater Ecology (22) 69-79
We characterized the fish assemblages in second to fifth order streams of the upper Little Sioux River basin in northwest Iowa, USA and compared our results with historical surveys. The fish assemblage consisted of over twenty species, was dominated numerically by creek chub, sand shiner, central stoneroller and other cyprinids,...
The impact of floods and storms on the acoustic reflectivity of the inner continental shelf: A modeling assessment
Lincoln F. Pratson, E. W. H. Hutton, A.J. Kettner, J.P.M. Syvitski, P.S. Hill, D.A. George, T.G. Milligan
2007, Continental Shelf Research (27) 542-559
Flood deposition and storm reworking of sediments on the inner shelf can change the mixture of grain sizes on the seabed and thus its porosity, bulk density, bulk compressional velocity and reflectivity. Whether these changes are significant enough to be detectable by...
Does avian species richness in natural patch mosaics follow the forest fragmentation paradigm?
D.C. Pavlacky Jr., S.H. Anderson
2007, Animal Conservation (10) 57-68
As one approaches the north-eastern limit of pinyon (Pinus spp.) juniper (Juniperus spp.) vegetation on the Colorado Plateau, USA, woodland patches become increasingly disjunct, grading into sagebrush (Artemisia spp.)-dominated landscapes. Patterns of avian species richness in naturally heterogeneous forests may or may not respond to patch discontinuity in the same...
Preface to the Madison declaration and critical synthesis papers on mercury pollution
James P. Hurley, David P. Krabbenhoft, James G. Wiener, Christopher L. Babiarz
2007, Ambio (36) 2-2
No abstract available....
Geology and complex collapse mechanisms of the 3.72 Ma Hannegan caldera, North Cascades, Washington, USA
David S. Tucker, Wes Hildreth, Tom Ullrich, Richard M. Friedman
2007, Geological Society of America Bulletin (119) 329-342
Contiguous ring faults of the 8 × 3.5 km Hannegan caldera enclose the Hannegan volcanics in the Cascade arc of northern Washington. The caldera collapsed in two phases, which each erupted rhyolitic ignimbrite (72.3%–75.2% SiO2). The first collapse phase, probably trap-door style, erupted...
Vertical spatial sensitivity and exploration depth of low-induction-number electromagnetic-induction instruments
J.B. Callegary, T.P.A. Ferre, R.W. Groom
2007, Vadose Zone Journal (6) 158-167
Vertical spatial sensitivity and effective depth of exploration (d e) of low-induction-number (LIN) instruments over a layered soil were evaluated using a complete numerical solution to Maxwell's equations. Previous studies using approximate mathematical solutions predicted a vertical spatial sensitivity for instruments operating under LIN conditions that, for a given transmitter-receiver...
