Common challenges for ecological modelling: synthesis of facilitated discussions held at the symposia organized for the 2009 conference of the International Society for Ecological Modelling in Quebec City, Canada, (October 6-9, 2009)
Guy R. Larocque, D. Mailly, T.-X. Yue, M. Anand, C. Peng, C. Kazanci, M. Etterson, P. Goethals, S.E. Jorgensen, J.R. Schramski, E.J.B. McIntire, D.J. Marceau, B. Chen, G.Q. Chen, Z.F. Yang, B. Novotna, N. Luckai, Jagtar S. Bhatti, J. Liu, A. Munson, Andrew M. Gordon, J.C. Ascough
2011, Ecological Modelling (222) 2456-2468
The eleven symposia organized for the 2009 conference of the International Society for Ecological Modelling (ISEM 2009) held in Quebec City, Canada, October 6–9, 2009, included facilitated discussion sessions following formal presentations. Each symposium focused on a specific subject, and all the subjects could be classified into three broad categories:...
Deciphering fluid sources of hydrothermal systems: A combined Sr- and S-isotope study on barite (Schwarzwald, SW Germany)
S. Staude, S. Gob, K. Pfaff, F. Strobele, W. R. Premo, G. Markl
2011, Chemical Geology (286) 1-20
Primary and secondary barites from hydrothermal mineralizations in SW Germany were investigated, for the first time, by a combination of strontium (Sr) isotope systematics (87Sr/86Sr), Sr contents and δ34S values to distinguish fluid sources and precipitation mechanisms responsible for their formation. Barite of Permian age derived its Sr solely from...
The high life: Transport of microbes in the atmosphere
D.J. Smith, Dale W. Griffin, D.A. Jaffe
2011, Eos, Transactions, American Geophysical Union (92) 249-250
Microbes (bacteria, fungi, algae, and viruses) are the most successful types of life on Earth because of their ability to adapt to new environments, reproduce quickly, and disperse globally. Dispersal occurs through a number of vectors, such as migrating animals or the hydrological cycle, but transport by wind may be...
Bounding species distribution models
Thomas J. Stohlgren, Catherine S. Jarnevich, Wayne E. Esaias, Jeffery T. Morisette
2011, Current Zoology (57) 642-647
Species distribution models are increasing in popularity for mapping suitable habitat for species of management concern. Many investigators now recognize that extrapolations of these models with geographic information systems (GIS) might be sensitive to the environmental bounds of the data used in their development, yet there is no recommended best...
Status and distribution of the Kittlitz's murrelet Brachyramphus brevirostris in Kenai Fjords, Alaska
Mayumi L. Arimitsu, John F. Piatt, Marc D. Romano, Thomas I. van Pelt
2011, Marine Ornithology: Journal of Seabird Research and Conservation (39) 13-22
The Kittlitz's Murrelet Brachyramphus brevirostris is a candidate species for listing under the US Endangered Species Act because of its apparent declines within core population areas of coastal Alaska. During the summers of 2006-2008, we conducted surveys in marine waters adjacent to Kenai Fjords National Park, Alaska, to estimate the...
OBIS-USA: a data-sharing legacy of the census of marine life
G.R. Sedberry, D.G. Fautin, M. Feldman, M.D. Fornwall, P. Goldstein, R.P. Guralnick
2011, Oceanography (24) 166-173
The United States Geological Survey's Biological Informatics Program hosts OBIS-USA, the US node of the Ocean Biogeographic Information System (OBIS). OBIS-USA gathers, coordinates, applies standard formats to, and makeswidely available data on biological collections in marine waters of the United States and other areas where US investigators have collected data...
Mapping the Philippines' mangrove forests using Landsat imagery
Jordan Long, Chandra Giri
2011, Sensors (11) 2972-2981
Current, accurate, and reliable information on the areal extent and spatial distribution of mangrove forests in the Philippines is limited. Previous estimates of mangrove extent do not illustrate the spatial distribution for the entire country. This study, part of a global assessment of mangrove dynamics, mapped the spatial distribution and...
Molecular characterization and comparison of shale oils generated by different pyrolysis methods using FT-ICR mass spectrometry
J.M. Jin, S. Kim, J.E. Birdwell
2011, Conference Paper, ACS National Meeting Book of Abstracts
Fourier transform ion cyclotron resonance mass spectrometry (FT ICR-MS) was applied in the analysis of shale oils generated using two different pyrolysis systems under laboratory conditions meant to simulate surface and in situ oil shale retorting. Significant variations were observed in the shale oils, particularly the degree of conjugation of...
Agricultural practices and residual corn during spring crane and waterfowl migration in Nebraska
Mark H. Sherfy, Michael J. Anteau, A.A. Bishop
2011, Journal of Wildlife Management (75) 995-1003
Nebraska's Central Platte River Valley (CPRV) is a major spring‐staging area for migratory birds. Over 6 million ducks, geese, and sandhill cranes (Grus canadensis) stage there en route to tundra, boreal forest, and prairie breeding habitats, storing nutrients for migration and reproduction by consuming primarily corn remaining in fields after...
Causes of systematic over- or underestimation of low streamflows by use of index-streamgage approaches in the United States
K. Eng, J.E. Kiang, Y.-Y. Chen, D.M. Carlisle, G.E. Granato
2011, Hydrological Processes (25) 2211-2220
Low-flow characteristics can be estimated by multiple linear regressions or the index-streamgage approach. The latter transfers streamflow information from a hydrologically similar, continuously gaged basin ('index streamgage') to one with a very limited streamflow record, but often results in biased estimates. The application of the index-streamgage approach can be generalized...
Modeling sulfate reduction in methane hydrate-bearing continental margin sediments: Does a sulfate-methane transition require anaerobic oxidation of methane?
A. Malinverno, John W. Pohlman
2011, Geochemistry, Geophysics, Geosystems (12)
The sulfate‐methane transition (SMT), a biogeochemical zone where sulfate and methane are metabolized, is commonly observed at shallow depths (1–30 mbsf) in methane‐bearing marine sediments. Two processes consume sulfate at and above the SMT, anaerobic oxidation of methane (AOM) and organoclastic sulfate reduction (OSR). Differentiating the relative contribution of each...
Formulation of a correlated variables methodology for assessment of continuous gas resources with an application to the Woodford play, Arkoma Basin, eastern Oklahoma
Ricardo A. Olea, D.W. Houseknecht, C.P. Garrity, T. A. Cook
2011, Boletin Geologico y Minero (122) 483-496
Shale gas is a form of continuous unconventional hydrocarbon accumulation whose resource estimation is unfeasible through the inference of pore volume. Under these circumstances, the usual approach is to base the assessment on well productivity through estimated ultimate recovery (EUR). Unconventional resource assessments that consider uncertainty are typically done by...
Revisiting the Earth's sea-level and energy budgets from 1961 to 2008
John A. Church, Neil J. White, Leonard F. Konikow, Catia M. Domingues, J. Graham Cogley, Eric Rignot, Jonathan M. Gregory, Michiel R. van den Broeke, Andrew J. Monaghan, Isabella Velicogna
2011, Geophysical Research Letters (38)
We review the sea-level and energy budgets together from 1961, using recent and updated estimates of all terms. From 1972 to 2008, the observed sea-level rise (1.8 0.2 mm yr-1 from tide gauges alone and 2.1 0.2 mm yr -1 from a combination of tide gauges and altimeter observations) agrees...
Magnetic properties in an ash flow tuff with continuous grain size variation: a natural reference for magnetic particle granulometry
J.L. Till, M.J. Jackson, J. G. Rosenbaum, P. Solheid
2011, Geochemistry, Geophysics, Geosystems (12)
The Tiva Canyon Tuff contains dispersed nanoscale Fe-Ti-oxide grains with a narrow magnetic grain size distribution, making it an ideal material in which to identify and study grain-size-sensitive magnetic behavior in rocks. A detailed magnetic characterization was performed on samples from the basal 5 m of the tuff. The magnetic...
Pigeonholing pyroclasts: Insights from the 19 March 2008 explosive eruption of Kīlauea volcano
Bruce F. Houghton, Don Swanson, R.J. Carey, J. Rausch, Andrew Sutton
2011, Geology (39) 263-266
We think, conventionally, of volcanic explosive eruptions as being triggered in one of two ways: by release and expansion of volatiles dissolved in the ejected magma (magmatic explosions) or by transfer of heat from magma into an external source of water (phreatic or phreatomagmatic explosions). We document here an event...
An observation of a partially albinistic zenaida macroura (Mourning Dove)
James Berdeen, David L. Otis
2011, Southeastern Naturalist (10) 185-188
Abstract Three of the 4 forms of albinism that occur in avifauna have been detected in Zenaida macroura (Mourning Dove). Albinism is rare in this species, and the incidence rate of each age and sex cohort is not well known. Consequently, we examined the pigmentation of Mourning Doves encountered in...
Simulating adsorption of U(VI) under transient groundwater flow and hydrochemistry: Physical versus chemical nonequilibrium model
J. Greskowiak, M.B. Hay, H. Prommer, C. Liu, V.E.A. Post, R. Ma, J.A. Davis, C. Zheng, J.M. Zachara
2011, Water Resources Research (47)
Coupled intragrain diffusional mass transfer and nonlinear surface complexation processes play an important role in the transport behavior of U(VI) in contaminated aquifers. Two alternative model approaches for simulating these coupled processes were analyzed and compared: (1) the physical nonequilibrium approach that explicitly accounts for aqueous speciation and instantaneous surface...
Young (<7 Ma) gold deposits and active geothermal systems of the Great Basin: Enigmas, questions, and exploration potential
Mark F. Coolbaugh, Peter G. Vikre, James E. Faulds
2011, Conference Paper, Geological Society of Nevada Symposium 2010: Great Basin Evolution and Metallogeny
Young gold systems in the Great Basin (£ 7 Ma), though not as well studied as their older counterparts, comprise a rapidly growing and in some ways controversial group. The gold inventory for these systems has more than doubled in the last 5 years from roughly 370 tonnes (12 Moz)...
Fish entrainment rates through towboat propellers in the Upper Mississippi and Illinois rivers
Killgore K. Jack, Leandro E. Miranda, C.E. Murphy, D.M. Wolff, J.J. Hoover, T.M. Keevin, S.T. Maynord, M.A. Cornish
2011, Transactions of the American Fisheries Society (140) 570-581
A specially designed net was used to study fish entrainment and injury through towboat propellers in 13 pools of the Upper Mississippi and Illinois rivers. The net was attached to the stern of a 48.8‐m‐long towboat with twin propellers (in Kort propulsion nozzles), and sampling typically took place while the...
Magmatic-vapor expansion and the formation of high-sulfidation gold deposits: Structural controls on hydrothermal alteration and ore mineralization
Byron R. Berger, Richard W. Henley
2011, Ore Geology Reviews (39) 75-90
High-sulfidation copper–gold lode deposits such as Chinkuashih, Taiwan, Lepanto, Philippines, and Goldfield, Nevada, formed within 1500 m of the paleosurface in volcanic terranes. All underwent an early stage of extensive advanced argillic silica–alunite alteration followed by an abrupt change to spatially much more restricted stages of fracture-controlled sulfide–sulfosalt mineral assemblages...
OMEGA: The Ostracod metadatabase of environmental and geographical attributes
D.J. Horne, Curry B. Brandon, Delorme L. Denis, K. Martens, A. J. Smith, R. J. Smith
2011, Joannea - Geologie und Palaontologie 80-84
[No abstract available]...
Regional spectral analysis of three moderate earthquakes in Northeastern North America
John Boatwright, Linda C. Seekins
2011, Bulletin of the Seismological Society of America (101) 1769-1782
We analyze Fourier spectra obtained from the horizontal components of broadband and accelerogram data from the 1997 Cap-Rouge, the 2002 Ausable Forks, and the 2005 Rivière-du-Loup earthquakes, recorded by Canadian and American stations sited on rock at hypocentral distances from 23 to 602 km. We check the recorded spectra closely...
Compensatory effects of recruitment and survival when amphibian populations are perturbed by disease
E. Muths, R. D. Scherer, D. S. Pilliod
2011, Journal of Applied Ecology (48) 873-879
The need to increase our understanding of factors that regulate animal population dynamics has been catalysed by recent, observed declines in wildlife populations worldwide. Reliable estimates of demographic parameters are critical for addressing basic and applied ecological questions and understanding the response of parameters to perturbations (e.g. disease, habitat loss,...
A multitracer approach for characterizing interactions between shallow groundwater and the hydrothermal system in the Norris Geyser Basin area, Yellowstone National Park
W.P. Gardner, David D. Susong, D. K. Solomon, H.P. Heasler
2011, Geochemistry, Geophysics, Geosystems (12)
Multiple environmental tracers are used to investigate age distribution, evolution, and mixing in local‐ to regional‐scale groundwater circulation around the Norris Geyser Basin area in Yellowstone National Park. Springs ranging in temperature from 3°C to 90°C in the Norris Geyser Basin area were sampled for stable isotopes of hydrogen and...
Role of origin and release location in pre-spawning distribution and movements of anadromous alewife
Holly J. Frank, M. E. Mather, Joseph M. Smith, Robert M. Muth, John T. Finn
2011, Fisheries Management and Ecology (18) 12-24
Capturing adult anadromous fish that are ready to spawn from a self sustaining population and transferring them into a depleted system is a common fisheries enhancement tool. The behaviour of these transplanted fish, however, has not been fully evaluated. The movements of stocked and native anadromous alewife, Alosa pseudoharengus (Wilson),...
