Strong SH-to-Love wave scattering off the Southern California Continental Borderland
Chunquan Yu, Zhongwen Zhan, Egill Hauksson, Elizabeth S. Cochran
2017, Geophysical Research Letters (44) 10208-10215
Seismic scattering is commonly observed and results from wave propagation in heterogeneous medium. Yet, deterministic characterization of scatterers associated with lateral heterogeneities remains challenging. In this study, we analyze broadband waveforms recorded by the Southern California Seismic Network and observe strongly scattered Love waves following the arrival of teleseismic SH...
Shear-wave velocity model from Rayleigh wave group velocities centered on the Sacramento/San Joaquin Delta
Jon Peter B. Fletcher, Jemile Erdem
2017, Pure and Applied Geophysics (174) 3825-3839
Rayleigh wave group velocities obtained from ambient noise tomography are inverted for an upper crustal model of the Central Valley, California, centered on the Sacramento/San Joaquin Delta. Two methods were tried; the first uses SURF96, a least-squares routine. It provides a good fit to the data, but convergence is dependent...
Selective transport of palynomorphs in marine turbiditic deposits: An example from the Ascension-Monterey Canyon system offshore central California
Mary McGann
2017, Quaternary International (469) 120-140
The pollen assemblage of a deep-sea core (15G) collected at lower bathyal depths (3491 m) on a levee of Monterey Canyon off central California was investigated to gain insights into the delivery processes of terrigenous material to submarine fans and the effect this transport has on the palynological record. Thirty-two...
Characterizing sources of uncertainty from global climate models and downscaling techniques
Adrienne Wootten, Adam Terando, Brian J. Reich, Ryan P. Boyles, Fred Semazzi
2017, Journal of Applied Meteorology and Climatology (56) 3245-3262
In recent years climate model experiments have been increasingly oriented towards providing information that can support local and regional adaptation to the expected impacts of anthropogenic climate change. This shift has magnified the importance of downscaling as a means to translate coarse-scale global climate model (GCM) output to a finer...
Fractional crystallization-induced variations in sulfides from the Noril’sk-Talnakh mining district (polar Siberia, Russia)
C.J. Duran, S-J. Barnes, P. Plese, M. Kudrna Prasek, Michael L. Zientek, P. Page
2017, Ore Geology Reviews (90) 326-351
The distribution of platinum-group elements (PGE) within zoned magmatic ore bodies has been extensively studied and appears to be controlled by the partitioning behavior of the PGE during fractional crystallization of magmatic sulfide liquids. However, other chalcophile elements, especially TABS (Te, As, Bi, Sb, and Sn) have been neglected despite...
Potential paths for male-mediated gene flow to and from an isolated grizzly bear population
Christopher P. Peck, Frank T. van Manen, Cecily M. Costello, Mark A. Haroldson, Lisa Landenburger, Lori L. Roberts, Daniel D. Bjornlie, Richard D. Mace
2017, Ecosphere (8) 1-19
For several decades, grizzly bear populations in the Greater Yellowstone Ecosystem (GYE) and the Northern Continental Divide Ecosystem (NCDE) have increased in numbers and range extent. The GYE population remains isolated and although effective population size has increased since the early 1980s, genetic connectivity between these populations remains a long-term...
Monitoring eradication of European mouflon sheep from the Kahuku Unit of Hawai‘i Volcanoes National Park
Seth Judge, Steven C. Hess, Jonathan K. Faford, Dexter Pacheco, Christina Leopold
2017, Pacific Science (71) 425-436
European mouflon (Ovis gmelini musimon), the world's smallest wild sheep, have proliferated and degraded fragile native ecosystems in the Hawaiian Islands through browsing, bark stripping, and trampling, including native forests within Hawai‘i Volcanoes National Park (HAVO). HAVO resource managers initiated ungulate control efforts in the 469 km2 Kahuku Unit after it...
Projected warming portends seasonal shifts of stream temperatures in the Crown of the Continent Ecosystem, USA and Canada
Leslie A. Jones, Clint C. Muhlfeld, Lucy A. Marshall
2017, Climatic Change (144) 641-655
Climate warming is expected to increase stream temperatures in mountainous regions of western North America, yet the degree to which future climate change may influence seasonal patterns of stream temperature is uncertain. In this study, a spatially explicit statistical model framework was integrated with empirical stream temperature data (approximately four...
Guest editorial: Aquatic science in the Northwest
Adam J. Sepulveda, Andrew M. Ray
2017, Northwest Science (3) 230-233
In recent years, Northwest Science has seen a significant increase in the number of submissions representing aquatic science. Our region is punctuated by aquatic systems. The current issue in particular, presents a number of new aquatic science contributions. Accordingly, Northwest Science invited the authors of this guest editorial to address the question, why is aquatic science so important...
Statistical design and analysis for plant cover studies with multiple sources of observation errors
Wilson J. Wright, Kathryn M. Irvine, Jeffrey M . Warren, Jenny K. Barnett
2017, Methods in Ecology and Evolution (8) 1832-1841
Effective wildlife habitat management and conservation requires understanding the factors influencing distribution and abundance of plant species. Field studies, however, have documented observation errors in visually estimated plant cover including measurements which differ from the true value (measurement error) and not observing a species that is present within...
Plastic ingestion by Black-footed Albatross Phoebastria nigripes from Kure Atoll, Hawai'i: Linking chick diet remains and parental at-sea foraging distributions
K. David Hyrenbach, Michelle M. Hester, Josh Adams, Andrew J. Titmus, Pam Michael, Travis Wahl, Chih-Wei Chang, Amarisa Marie, Cynthia Vanderlip
2017, Marine Ornithology: Journal of Seabird Research and Conservation (45) 225-236
We quantified the incidence (percentage of samples with plastic) and loads (mass, volume) of four plastic types (fragments, line, sheet, foam) ingested by Black-footed Albatross Phoebastria nigripes chicks raised on Kure Atoll, the westernmost Hawaiian colony. All 25 samples contained plastic, mostly in the form of foam and line. On...
Quantile regression applications in ecology and the environmental sciences
Brian S. Cade
Roger Koenker, Victor Chernozhukov, Xuming He, Limin Peng, editor(s)
2017, Book chapter, Handbook of Quantile Regression
No abstract available....
Extinguishing a learned response in a free-ranging gray wolf (Canis lupus)
L. David Mech
2017, Canadian Field-Naturalist (131) 23-25
A free-ranging Gray Wolf (Canis lupus), habituated to human presence (the author) on Ellesmere Island, Canada, learned to anticipate experimental feeding by a human, became impatient, persistent, and bold and exhibited stalking behaviour toward the food source. Only after the author offered the wolf about 90 clumps of dry soil...
Biostratigraphic and morphometric analyses of specimens from the calcareous nannofossil genus Tribrachiatus
Jean Self-Trail, Ellen Seefelt, Claire L. Shepherd, Victoria A. Martin
2017, Journal of Nannoplankton Research (37) 177-188
Biostratigraphic and morphometric analyses of calcareous nannofossil assemblages from one outcrop and two cored sections of lower Eocene sediments reveal the presence of two new species: Tribrachiatus lunatus sp. nov., and Tribrachiatus absidatus sp. nov. Differences between the new species and Tribrachiatus orthostylus are discussed. The first occurrence...
Applying citizen-science data and mark-recapture models to estimate numbers of migrant golden eagles in an important bird area in eastern North America
Andrew J. Dennhardt, Adam E. Duerr, David Brandes, Todd E. Katzner
2017, The Condor (119) 817-831
Estimates of population abundance are important to wildlife management and conservation. However, it can be difficult to characterize the numbers of broadly distributed, low-density, and elusive bird species. Although Golden Eagles (Aquila chrysaetos) are rare, difficult to detect, and broadly distributed, they are concentrated during their autumn migration at monitoring...
Assessing models of arsenic occurrence in drinking water from bedrock aquifers in New Hampshire
Caroline Andy, Maria Florencia Fahnestock, Melissa A. Lombard, Laura Hayes, Julie Bryce, Joseph D. Ayotte
2017, Journal of Contemporary Water Research and Education (160) 25-41
Three existing multivariate logistic regression models were assessed using new data to evaluate the capacity of the models to correctly predict the probability of groundwater arsenic concentrations exceeding the threshold values of 1, 5, and 10 micrograms per liter (µg/L) in New Hampshire, USA. A recently released testing dataset includes...
Where can wolves live and how can we live with them?
L. David Mech
2017, Biological Conservation (210) 310-317
In the contiguous 48 United States, southern Canada, and in Europe, wolves (Canis lupus) have greatly increased and expanded their range during the past few decades.They are prolific, disperse long distances, readily recolonize new areas where humans allow them, and are difficult to control when populations become established.Because wolves originally...
Groundwater-level trends in the U.S. glacial aquifer system, 1964-2013
Glenn A. Hodgkins, Robert W. Dudley, Martha G. Nielsen, Benjamin Renard, Sharon L. Qi
2017, Journal of Hydrology (553) 289-303
The glacial aquifer system in the United States is a major source of water supply but previous work on historical groundwater trends across the system is lacking. Trends in annual minimum, mean, and maximum groundwater levels for 205 monitoring wells were analyzed across three regions of the system (East, Central,...
An unparalleled opportunity for an important ecological study
L. David Mech, Shannon Barber-Meyer, Juan Carlos Blanco, Luigi Boitani, Ludwig N. Carbyn, Glenn D. DelGuidice, Steven H. Fritts, Djuro Huber, O. Liberg, Brent Patterson, Richard P. Thiel
2017, BioScience (67) 875-876
Wolves (Canis lupus) and moose (Alces americanus) have been studied since 1958 on 540-square-kilometer Isle Royale National Park, in Lake Superior. Wolves arrived there across the ice around 1949, and the population once increased to about 50, averaging about 25 annually (Mech 1966, Jordan et al. <a class="link...
Implementing Nepal's national building code—A case study in patience and persistence
Lucy Arendt, Ayse Hortacsu, Kishor S. Jaiswal, John Bevington, Surya Shrestha, Forrest Lanning, Garmalia Mentor-William, Ghazala Naeem, Kate Thibert
2017, Earthquake Spectra (33) S167-S183
The April 2015 Gorkha Nepal earthquake revealed the relative effectiveness of the Nepal Standard, or national building code (NBC), and irregular compliance with it in different parts of Nepal. Much of the damage to more than half a million Nepal's residential structures may be attributed to the prevalence of owner-built...
The nexus of fun and nutrition: Recreational fishing is also about food
Steven J. Cooke, William M. Twardek, Robert J. Lennox, Aaron J. Zolderdo, Shannon D. Bower, Lee F. G. Gutowsky, Andy J. Danylchuk, Robert Arlinghaus, Beard Jr.
2017, Fish and Fisheries (19) 2012-224
Recreational fishing is a popular activity in aquatic ecosystems around the globe using a variety of gears including rod and line and to a lesser extent handlines, spears, bow and arrow, traps and nets. Similar to the propensity to engage in voluntary catch-and-release, the propensity to harvest fishes strongly varies...
U.S. Geological Survey input-data forms for the assessment of the Spraberry Formation of the Midland Basin, Permian Basin Province, Texas, 2017
Kristen R. Marra
2017, Open-File Report 2017-1117
In 2017, the U.S. Geological Survey (USGS) completed an updated assessment of undiscovered, technically recoverable oil and gas resources in the Spraberry Formation of the Midland Basin (Permian Basin Province) in southwestern Texas (Marra and others, 2017). The Spraberry Formation was assessed using both the standard continuous (unconventional) and conventional...
Simulation of daily streamflow for 12 river basins in western Iowa using the Precipitation-Runoff Modeling System
Daniel E. Christiansen, Adel E. Haj, John C. Risley
2017, Scientific Investigations Report 2017-5091
The U.S. Geological Survey, in cooperation with the Iowa Department of Natural Resources, constructed Precipitation-Runoff Modeling System models to estimate daily streamflow for 12 river basins in western Iowa that drain into the Missouri River. The Precipitation-Runoff Modeling System is a deterministic, distributed-parameter, physical-process-based modeling system developed to evaluate the...
Geologic map of the Dusar area, Herat Province, Afghanistan; Modified from the 1973 original map compilations of V.I. Tarasenko and others
2017, Open-File Report 2017-1126
The geologic maps and cross sections presented in this report are redrafted and modified versions of the Geologic map and map of useful minerals of the Dusar area (scale 1:50,000) and Geologic sketch map of the Dusar and Namak-sory ore occurrences (scale 1:10,000), located in the Herat Province, Afghanistan. The...
Some results from ModEM3DMT, the freely available OSU 3D MT inversion code
Gary D. Egbert, Naser Meqbel, Anna Kelbert
2017, Conference Paper
At the 3DEM-5 workshop in 2013, we presented a paper entitled "ModEM: developing 3D EM inversion for the masses", outlining our then recent development of a modular system for inversion of EM geophysical data, called ModEM. As promised in that presentation, we made a version of the code that is...
