Atlantic reef fish biogeography and evolution
S.R. Floeter, L.A. Rocha, D.R. Robertson, J.C. Joyeux, W. F. Smith-Vaniz, P. Wirtz, A.J. Edwards, J.P. Barreiros, C.E.L. Ferreira, J.L. Gasparini, A. Brito, J.M. Falcon, B.W. Bowen, G. Bernardi
2008, Journal of Biogeography (35) 22-47
Aim: To understand why and when areas of endemism (provinces) of the tropical Atlantic Ocean were formed, how they relate to each other, and what processes have contributed to faunal enrichment. Location: Atlantic Ocean. Methods: The distributions of 2605 species of reef fishes were compiled for 25 areas of the...
100 Myr record of sequences, sedimentary facies and sea level change from Ocean Drilling Program onshore coreholes, US Mid-Atlantic coastal plain
J.V. Browning, K.G. Miller, P. J. Sugarman, M.A. Kominz, P.P. McLaughlin, A.A. Kulpecz, M.D. Feigenson
2008, Basin Research (20) 227-248
We analyzed the latest Early Cretaceous to Miocene sections (???110-7Ma) in 11 New Jersey and Delaware onshore coreholes (Ocean Drilling Program Legs 150X and 174AX). Fifteen to seventeen Late Cretaceous and 39-40 Cenozoic sequence boundaries were identified on the basis of physical and temporal breaks. Within-sequence changes follow predictable patterns...
Simulated fate and transport of metolachlor in the unsaturated zone, Maryland, USA
E.R. Bayless, P. D. Capel, J.E. Barbash, R.M.T. Webb, T.L.C. Hancock, D.C. Lampe
2008, Journal of Environmental Quality (37) 1064-1072
An unsaturated-zone transport model was used to examine the transport and fate of metolachlor applied to an agricultural site in Maryland, USA. The study site was instrumented to collect data on soil-water content, soil-water potential, ground water levels, major ions, pesticides, and nutrients from the unsaturated zone during 2002-2004. The...
Transport and fate of nitrate at the ground-water/surface-water interface
L.J. Puckett, C. Zamora, H. Essaid, J.T. Wilson, H.M. Johnson, M.J. Brayton, J. R. Vogel
2008, Journal of Environmental Quality (37) 1034-1050
Although numerous studies of hyporheic exchange and denitrification have been conducted in pristine, high-gradient streams, few studies of this type have been conducted in nutrient-rich, low-gradient streams. This is a particularly important subject given the interest in nitrogen (N) inputs to the Gulf of Mexico and other eutrophic aquatic systems....
Fundamental limits to the accuracy of deuterium isotopes for identifying the spatial origin of migratory animals
A. Farmer, B.S. Cade, J. Torres-Dowdall
2008, Oecologia (158) 183-192
Deuterium isotope analyses have revolutionized the study of migratory connectivity because global gradients of deuterium in precipitation (??DP) are expressed on a continental scale. Several authors have constructed continental scale base maps of ??DP to provide a spatial reference for studying the movement patterns of migratory species and, although they...
An assessment of the effects of cell size on AGNPS modeling of watershed runoff
S.-S. Wu, E.L. Usery, M.P. Finn, D.D. Bosch
2008, Cartography and Geographic Information Science (35) 265-278
This study investigates the changes in simulated watershed runoff from the Agricultural NonPoint Source (AGNPS) pollution model as a function of model input cell size resolution for eight different cell sizes (30 m, 60 m, 120 m, 210 m, 240 m, 480 m, 960 m, and 1920 m) for the...
Modeling variability and trends in pesticide concentrations in streams
A. V. Vecchia, Jeffrey D. Martin, R. J. Gilliom
2008, Journal of the American Water Resources Association (44) 1308-1324
A parametric regression model was developed for assessing the variability and long-term trends in pesticide concentrations in streams. The dependent variable is the logarithm of pesticide concentration and the explanatory variables are a seasonal wave, which represents the seasonal variability of concentration in response to seasonal application rates; a streamflow...
Mercury concentrations in blood and feathers of prebreeding Forster's terns in relation to space use of San Francisco Bay, California, USA, habitats
Joshua T. Ackerman, Collin A. Eagles-Smith, John Y. Takekawa, J.D. Bluso, T.L. Adelsbach
2008, Environmental Toxicology and Chemistry (27) 897-908
We examined mercury concentrations and space use of prebreeding Forster's terns (Sterna forsteri) in San Francisco Bay, California, USA, to assess factors influencing mercury levels in piscivorous birds. In 2005 and 2006, we collected blood and feathers from 122 Forster's terns and radio-marked and tracked 72 terns to determine locations...
Ontology-based geospatial data query and integration
T. Zhao, C. Zhang, M. Wei, Z.-R. Peng
2008, Conference Paper
Geospatial data sharing is an increasingly important subject as large amount of data is produced by a variety of sources, stored in incompatible formats, and accessible through different GIS applications. Past efforts to enable sharing have produced standardized data format such as GML and data access protocols such as Web...
Efficient estimation of abundance for patchily distributed populations via two-phase, adaptive sampling.
M.J. Conroy, J.P. Runge, R. J. Barker, M.R. Schofield, C.J. Fonnesbeck
2008, Ecology (89) 3362-3370
Many organisms are patchily distributed, with some patches occupied at high density, others at lower densities, and others not occupied. Estimation of overall abundance can be difficult and is inefficient via intensive approaches such as capture-mark-recapture (CMR) or distance sampling. We propose a two-phase sampling scheme and model in a...
The effects of water-level fluctuations on vegetation in a Lake Huron wetland
D.A. Wilcox, S. J. Nichols
2008, Wetlands (28) 487-501
The diversity and resultant habitat value of wetland plant communities in the Laurentian Great Lake's are dependent on water-level fluctuations of varying frequency and amplitude. Conceptual models have described the response of vegetation to alternating high and low lake levels, but few quantitative studies have documented the changes that occur....
The Ellsworth terrane, coastal Maine: Geochronology, geochemistry, and Nd-Pb isotopic composition - Implications for the rifting of Ganderia
K. J. Schulz, D. B. Stewart, R. D. Tucker, J.C. Pollock, R. A. Ayuso
2008, Geological Society of America Bulletin (120) 1134-1158
The Ellsworth terrane is one of a number of fault-bounded blocks that occur along the eastern margin of Ganderia, the western-most of the peri-Gondwanan domains in the northern Appalachians that were accreted to Laurentia in the Paleozoic. Geologic relations, detrital zircon ages, and basalt geochemistry suggest that the Ellsworth terrane...
Characterizing the marsh dieback spectral response at the plant and canopy level with hyperspectral and temporal remote sensing data
E. Ramsey, A. Rangoonwala
2008, Conference Paper, US/EU-Baltic International Symposium: Ocean Observations, Ecosystem-Based Management and Forecasting - Provisional Symposium Proceed
We describe newly developed remote sensing tools to map the localized occurrences and regional distribution of the marsh dieback in coastal Louisiana (Fig. 1). As a final goal of our research and development, we identified what spectral features accompanied the onset of dieback and could be directly linked to the...
Assessment of forest geospatial patterns over the three giant forest areas of China
M.-S. Li, Z.-L. Zhu, H. Lu, D. Xu, A.-X. Liu, S.-K. Peng
2008, Journal of Forestry Research (19) 25-31
Geospatial patterns of forest fragmentation over the three traditional giant forested areas of China (Northeastern, southwestern and Southern China) were analyzed comparatively and reported based on a 250-m resolution land cover dataset. Specifically, the spatial patterns of forest fragmentation were characterized by combining geospatial metrics and forest fragmentation models. The...
The effects of land use on fluvial sediment chemistry for the conterminous U.S. - Results from the first cycle of the NAWQA Program: Trace and major elements, phosphorus, carbon, and sulfur
A. J. Horowitz, V. C. Stephens
2008, Science of the Total Environment (400) 290-314
In 1991, the U.S. Geological Survey (USGS) began the first cycle of its National Water Quality Assessment (NAWQA) Program. The Program encompassed 51 river basins that collectively accounted for more than 70% of the total water use (excluding power generation), and 50% of the drinking water supply in the U.S....
Spatial and temporal statistical analysis of bycatch data: Patterns of sea turtle bycatch in the North Atlantic
B. Gardner, P.J. Sullivan, S.J. Morreale, S.P. Epperly
2008, Canadian Journal of Fisheries and Aquatic Sciences (65) 2461-2470
Loggerhead (Caretta caretta) and leatherback (Dermochelys coriacea) sea turtle distributions and movements in offshore waters of the western North Atlantic are not well understood despite continued efforts to monitor, survey, and observe them. Loggerhead and leatherback sea turtles are listed as endangered by the World Conservation Union, and thus anthropogenic...
Modeling potential habitats for alien species Dreissena polymorpha in continental USA
Li Mingyang, Ju Yunwei, Sunil Kumar, Thomas J. Stohlgren
2008, Acta Ecologica Sinica (28) 4253-4258
The effective measure to minimize the damage of invasive species is to block the potential invasive species to enter into suitable areas. 1864 occurrence points with GPS coordinates and 34 environmental variables from Daymet datasets were gathered, and 4 modeling methods, i.e., Logistic Regression (LR), Classification and Regression Trees (CART),...
Gas and gas hydrate distribution around seafloor seeps in Mississippi Canyon, Northern Gulf of Mexico, using multi-resolution seismic imagery
W.T. Wood, P. E. Hart, D. R. Hutchinson, N. Dutta, F. Snyder, R.B. Coffin, J.F. Gettrust
2008, Marine and Petroleum Geology (25) 952-959
To determine the impact of seeps and focused flow on the occurrence of shallow gas hydrates, several seafloor mounds in the Atwater Valley lease area of the Gulf of Mexico were surveyed with a wide range of seismic frequencies. Seismic data were acquired with a deep-towed, Helmholz resonator source (220-820...
Comparisons of shear-wave slowness in the Santa Clara Valley, California using blind interpretations of data from invasive and noninvasive methods
D.M. Boore, M.W. Asten
2008, Bulletin of the Seismological Society of America (98) 1983-2003
Many groups contributed to a blind interpretation exercise for the determination of shear-wave slowness beneath the Santa Clara Valley. The methods included invasive methods in deep boreholes as well as noninvasive methods using active and passive sources, at six sites within the valley (with most investigations being conducted at a...
Breeding stage influences space use of female American avocets in San Francisco Bay, California
Scott A. Demers, M. A. Colwell, John Y. Takekawa, Joshua T. Ackerman
2008, Waterbirds (31) 365-371
Female American Avocets (Recurvirostra americana) were radio-marked (N=15) and tracked in the South San Francisco Bay, California, to determine if space use varied by breeding stage. Visual observations were used to determine breeding stage (pre-incubation, incubation, brood-rearing, post-breeding) of marked avocets. Space use measurements (linear movements, home ranges, core areas,...
ALLTEM UXO detection and discrimination
T.H. Asch, D.L. Wright, C.W. Moulton, T.P. Irons, M.N. Nabighian
2008, Conference Paper, SEG Technical Program Expanded Abstracts
ALLTEM is a multi-axis electromagnetic induction system designed for unexploded ordnance (UXO) applications. It uses a continuous triangle-wave excitation and provides good late-time signal-to-noise ratio (SNR) especially for ferrous targets. Multi-axis transmitter (Tx) and receiver (Rx) systems such as ALLTEM provide a richer data set from which to invert for...
Understanding the relationship between audiomagnetotelluric data and models, and borehole data in a hydrological environment
D.K. McPhee, L. Pellerin
2008, Conference Paper, SEG Technical Program Expanded Abstracts
Audiomagnetotelluric (AMT) data and resulting models are analyzed with respect to geophysical and geological borehole logs in order to clarify the relationship between the two methodologies of investigation of a hydrological environment. Several profiles of AMT data collected in basins in southwestern United States are being used for groundwater exploration...
Modelling the impact of wind stress and river discharge on Danshuei River plume
W.-C. Liu, W.-B. Chen, R. T. Cheng, M.-H. Hsu
2008, Applied Mathematical Modelling (32) 1255-1280
A three-dimensional, time-dependent, baroclinic, hydrodynamic and salinity model, UnTRIM, was performed and applied to the Danshuei River estuarine system and adjacent coastal sea in northern Taiwan. The model forcing functions consist of tidal elevations along the open boundaries and freshwater inflows from the main stream and major tributaries in the...
Using the Model Coupling Toolkit to couple earth system models
J.C. Warner, N. Perlin, E.D. Skyllingstad
2008, Environmental Modelling and Software (23) 1240-1249
Continued advances in computational resources are providing the opportunity to operate more sophisticated numerical models. Additionally, there is an increasing demand for multidisciplinary studies that include interactions between different physical processes. Therefore there is a strong desire to develop coupled modeling systems that utilize existing models and allow efficient data...
An annual plant growth proxy in the Mojave Desert using MODIS-EVI data
C.S.A. Wallace, K.A. Thomas
2008, Sensors (8) 7792-7808
In the arid Mojave Desert, the phenological response of vegetation is largely dependent upon the timing and amount of rainfall, and maps of annual plant cover at any one point in time can vary widely. Our study developed relative annual plant growth models as proxies for annual plant cover using...
