Microbial sulfate reduction and the sulfur budget for a complete section of altered oceanic basalts, IODP Hole 1256D (eastern Pacific)
Jeffrey C. Alt, Wayne C. Shanks
2011, Earth and Planetary Science Letters (310) 73-83
Sulfide mineralogy and the contents and isotope compositions of sulfur were analyzed in a complete oceanic volcanic section from IODP Hole 1256D in the eastern Pacific, in order to investigate the role of microbes and their effect on the sulfur budget in altered upper oceanic crust. Basalts in the 800m...
A working environment for digital planetary data processing and mapping using ISIS and GRASS GIS
A. Frigeri, T. Hare, M. Neteler, A. Coradini, C. Federico, R. Orosei
2011, Conference Paper, Planetary and Space Science
Since the beginning of planetary exploration, mapping has been fundamental to summarize observations returned by scientific missions. Sensor-based mapping has been used to highlight specific features from the planetary surfaces by means of processing. Interpretative mapping makes use of instrumental observations to produce thematic maps that summarize observations of actual...
Ecosystem development in roadside grasslands: Biotic control, plant-soil interactions, and dispersal limitations
P. Garcia-Palacios, M. A. Bowker, F.T. Maestre, S. Soliveres, F. Valladares, J. Papadopoulos, A. Escudero
2011, Ecological Applications (21) 2806-2821
Roadside grasslands undergoing secondary succession are abundant, and represent ecologically meaningful examples of novel, human‐created ecosystems. Interactions between plant and soil communities (hereafter plant–soil interactions) are of major importance in understanding the role of biotic control in ecosystem functioning, but little is known about these links in the context of...
Response of surface processes to climatic change in the dunefields and Loess Plateau of North China during the late Quaternary
H. Lu, J.A. Mason, T. Stevens, Y. Zhou, S. Yi, X. Miao
2011, Earth Surface Processes and Landforms (36) 1590-1603
This paper draws on recent optically stimulated luminescence (OSL) dating to evaluate the long‐held assumption that dust accumulation rates in the Loess Plateau and the extent of active aeolian sand in the dunefields to the north have varied together over time, because both are controlled by the strength of the...
Decision analysis for conservation breeding: Maximizing production for reintroduction of whooping cranes
Des Smith, Sarah J. Converse, Keith Gibson, Axel Moehrenschlager, William A. Link, Glenn H. Olsen, Kelly Maguire
2011, Journal of Wildlife Management (75) 501-508
Captive breeding is key to management of severely endangered species, but maximizing captive production can be challenging because of poor knowledge of species breeding biology and the complexity of evaluating different management options. In the face of uncertainty and complexity, decision-analytic approaches can be used to identify optimal management options...
Survival of European mouflon (Artiodactyla: Bovidae) in Hawai'i based on tooth cementum lines
S.C. Hess, R.M. Stephens, T.L. Thompson, R.M. Danner, B. Kawakami Jr.
2011, Pacific Science (65) 59-67
Reliable techniques for estimating age of ungulates are necessary to determine population parameters such as age structure and survival. Techniques that rely on dentition, horn, and facial patterns have limited utility for European mouflon sheep (Ovis gmelini musimon), but tooth cementum lines may offer a useful alternative. Cementum lines may...
Surface (sea floor) and near-surface (box cores) sediment mineralogy in Baffin Bay as a key to sediment provenance and ice sheet variations
John T. Andrews, D. D. Eberl
2011, Canadian Journal of Earth Sciences (48) 1307-1328
To better understand the glacial history of the ice sheets surrounding Baffin Bay and to provide information on sediment pathways, samples from 82 seafloor grabs and core tops, and from seven box cores were subjected to quantitative X-ray diffraction weight percent (wt.%) analysis of the <2 mm sediment fraction. The samples...
Standardized North American marsh bird monitoring protocol
Courtney J. Conway
2011, Waterbirds (34) 319-346
Little is known about the population status of many marsh-dependent birds in North America but recent efforts have focused on collecting more reliable information and estimates of population trends. As part of that effort, a standardized survey protocol was developed in 1999 that provided guidance for conducting marsh bird surveys...
Integration of Palmer Drought Severity Index and remote sensing data to simulate wetland water surface from 1910 to 2009 in Cottonwood Lake area, North Dakota
Shengli Huang, Devendra Dahal, Claudia Young, Gyanesh Chander, Shuguang Liu
2011, Remote Sensing of Environment (115) 3377-3389
Spatiotemporal variations of wetland water in the Prairie Pothole Region are controlled by many factors; two of them are temperature and precipitation that form the basis of the Palmer Drought Severity Index (PDSI). Taking the 196 km2 Cottonwood Lake area in North Dakota as our pilot study site, we integrated PDSI, Landsat...
Quantifying the hydrological responses to climate change in an intact forested small watershed in Southern China
G. Zhou, X. Wei, Y. Wu, Y. Huang, J. Yan, Dongxiao Zhang, Q. Zhang, J. Liu, Z. Meng, C. Wang, G. Chu, S. Liu, X. Tang, Xiuying Liu
2011, Global Change Biology (17) 3736-3746
Responses of hydrological processes to climate change are key components in the Intergovernmental Panel for Climate Change (IPCC) assessment. Understanding these responses is critical for developing appropriate mitigation and adaptation strategies for sustainable water resources management and protection of public safety. However, these responses are not well understood and little...
Spectral heterogeneity on Phobos and Deimos: HiRISE observations and comparisons to Mars Pathfinder results
N. Thomas, R. Stelter, A. Ivanov, N.T. Bridges, Kenneth E. Herkenhoff, A. S. McEwen
2011, Planetary and Space Science (59) 1281-1292
The High-Resolution Imaging Science Experiment (HiRISE) onboard Mars Reconnaissance Orbiter (MRO) has been used to observe Phobos and Deimos at spatial scales of around 6 and 20 m/px, respectively. HiRISE (McEwen et al.; JGR, 112, CiteID E05S02, DOI: 10.1029/2005JE002605, 2007) has provided, for the first time, high-resolution colour images of...
Fishes and tetrapods in the upper pennsylvanian (kasimovian) cohn coal member of the mattoon formation of illinois, United States: Systematics, paleoecology, and paleoenvironments
D. Carpenter, H. J. Falcon-Lang, M.J. Benton, W.J. Nelson
2011, Palaios (26) 639-657
A newly discovered vertebrate assemblage is reported from the Upper Pennsylvanian (mid- to upper Kasimovian) Cohn Coal Member of the Mattoon Formation of southeast Illinois, United States. Teeth, scales, and spines of xenacanth (Dicentrodus, Orthacanthus, Triodus, Xenacanthus) and euselachian (Sphenacanthus) sharks dominate the assemblage. Less common are the teeth, scales,...
Shallow degassing events as a trigger for very-long-period seismicity at Kīlauea Volcano, Hawai‘i
Matthew Patrick, David Wilson, David Fee, Tim R. Orr, Donald A. Swanson
2011, Bulletin of Volcanology (73) 1179-1186
The first eruptive activity at Kīlauea Volcano’s summit in 25 years began in March 2008 with the opening of a 35-m-wide vent in Halema‘uma‘u crater. The new activity has produced prominent very-long-period (VLP) signals corresponding with two new behaviors: episodic tremor bursts and small explosive events, both of which represent...
High-frequency Born synthetic seismograms based on coupled normal modes
F. Pollitz
2011, Geophysical Journal International (187) 1420-1442
High-frequency and full waveform synthetic seismograms on a 3-D laterally heterogeneous earth model are simulated using the theory of coupled normal modes. The set of coupled integral equations that describe the 3-D response are simplified into a set of uncoupled integral equations by using the Born approximation to calculate scattered...
Nearshore Tsunami Inundation Model Validation: Toward Sediment Transport Applications
Alex Apotsos, Mark Buckley, Guy Gelfenbaum, Bruce Jaffe, Deepak Vatvani
2011, Pure and Applied Geophysics (168) 2097-2119
Model predictions from a numerical model, Delft3D, based on the nonlinear shallow water equations are compared with analytical results and laboratory observations from seven tsunami-like benchmark experiments, and with field observations from the 26 December 2004 Indian Ocean tsunami. The model accurately predicts the magnitude and timing of the measured...
Expansion rate and geometry of floating vegetation mats on the margins of thermokarst lakes, northern Seward Peninsula, Alaska, USA
A.D. Parsekian, Benjamin M. Jones, M. Jones, G. Grosse, Anthony K.M. Walter, L. Slater
2011, Earth Surface Processes and Landforms (36) 1889-1897
Investigations on the northern Seward Peninsula in Alaska identified zones of recent (<50 years) permafrost collapse that led to the formation of floating vegetation mats along thermokarst lake margins. The occurrence of floating vegetation mat features indicates rapid degradation of near‐surface permafrost and lake expansion. This paper reports on the recent...
The influence of stream channels on distributions of Larrea tridentata and Ambrosia dumosa in the Mojave Desert, CA, USA: Patterns, mechanisms and effects of stream redistribution
S. Schwinning, D.R. Sandquist, D. M. Miller, D. R. Bedford, S. L. Phillips, J. Belnap
2011, Ecohydrology (4) 12-25
Drainage channels are among the most conspicuous surficial features of deserts, but little quantitative analysis of their influence on plant distributions is available. We analysed the effects of desert stream channels (‘washes’) on Larrea tridentata and Ambrosia dumosa density and cover on an alluvial piedmont in the Mojave Desert, based on a spatial analysis...
Sex-related differences in habitat associations of wintering American Kestrels in California's Central Valley
E.R. Pandolfino, M.P. Herzog, Z. Smith
2011, Journal of Raptor Research (45) 236-243
We used roadside survey data collected from 19 routes over three consecutive winters from 2007–08 to 2009–10 to compare habitat associations of male and female American Kestrels (Falco sparverius) in the Central Valley of California to determine if segregation by sex was evident across this region. As a species,...
Gender-based differences in Florida apple snail (Pomacea paludosa) movements
P. L. Valentine-Darby, P.C. Darby, H.F. Percival
2011, Malacologia (54) 109-118
Gastropod movements have been studied in the context of habitat selection, finding food and mates, and avoiding predation. Many of these studies were conducted in the laboratory, where constraints on spatial scale influence behavior. We conducted a field study of Florida apple snail (Pomacea paludosa) movements using telemetry. We hypothesized...
Waves and tides responsible for the intermittent closure of the entrance of a small, sheltered tidal wetland at San Francisco, CA
D.M. Hanes, K. Ward, L. H. Erikson
2011, Continental Shelf Research (31) 1682-1687
Crissy Field Marsh (CFM; http://www.nps.gov/prsf/planyourvisit/crissy-field-marsh-and-beach.htm) is a small, restored tidal wetland located in the entrance to San Francisco Bay just east of the Golden Gate. The marsh is small but otherwise fairly typical of many such restored wetlands worldwide. The marsh is hydraulically connected to the...
The GeoClaw software for depth-averaged flows with adaptive refinement
M.J. Berger, D.L. George, R.J. LeVeque, Kyle T. Mandli
2011, Advances in Water Resources (34) 1195-1206
Many geophysical flow or wave propagation problems can be modeled with two-dimensional depth-averaged equations, of which the shallow water equations are the simplest example. We describe the GeoClaw software that has been designed to solve problems of this nature, consisting of open source Fortran programs together with Python tools for...
Landscape features influence postrelease predation on endangered black-footed ferrets
S.A. Poessel, S.W. Breck, E. Biggins, T.M. Livieri, K.R. Crooks, L. Angeloni
2011, Journal of Mammalogy (92) 732-741
Predation can be a critical factor influencing recovery of endangered species. In most recovery efforts lethal and nonlethal influences of predators are not sufficiently understood to allow prediction of predation risk, despite its importance. We investigated whether landscape features could be used to model predation risk from coyotes (Canis latrans)...
Marine and terrestrial factors affecting Adélie penguin Pygoscelis adeliae chick growth and recruitment off the western Antarctic Peninsula
Erik W. Chapman, Eileen E. Hofmann, Donna L. Patterson, Christine A. Ribic, William R. Fraser
2011, Marine Ecology Progress Series (436) 273-289
An individual-based bioenergetics model that simulates the growth of an Adélie penguin Pygoscelis adeliaechick from hatching to fledging was used to assess marine and terrestrial factors that affect chick growth and fledging mass off the western Antarctic Peninsula. Simulations considered the effects on Adélie penguin fledging mass of (1) modification of...
Environmental conditions constrain the distribution and diversity of archaeal merA in Yellowstone National Park, Wyoming, U.S.A.
Y. Wang, E. Boyd, S. Crane, P. Lu-Irving, David P. Krabbenhoft, S. King, J. Dighton, G. Geesey, T. Barkay
2011, Microbial Ecology (62) 739-752
The distribution and phylogeny of extant protein-encoding genes recovered from geochemically diverse environments can provide insight into the physical and chemical parameters that led to the origin and which constrained the evolution of a functional process. Mercuric reductase (MerA) plays an integral role in mercury (Hg) biogeochemistry by catalyzing the...
Multivariate analyses with end-member mixing to characterize groundwater flow: Wind Cave and associated aquifers
Andrew J. Long, J.F. Valder
2011, Journal of Hydrology (409) 315-327
Principal component analysis (PCA) applied to hydrochemical data has been used with end-member mixing to characterize groundwater flow to a limited extent, but aspects of this approach are unresolved. Previous similar approaches typically have assumed that the extreme-value samples identified by PCA represent end members. The method presented herein is...
