California spotted owls
Suzanne C. Roberts, M. North
2012, General Technical Report PSW-GTR-237-5
California spotted owls (Strix occidentalis occidentalis) are habitat specialists that are strongly associated with late-successional forests. For nesting and roosting, they require large trees and snags embedded in a stand with a complex forest structure (Blakesley et al. 2005, Gutiérrez et al. 1992, Verner et al. 1992b). In mixed-conifer forests...
Soil-occupancy effects of invasive and native grassland plant species on composition and diversity of mycorrhizal associations
Nicholas R. Jordan, Laura Aldrich-Wolfe, Sheri C. Huerd, Diane L. Larson, Gary Muehlbauer
2012, Invasive Plant Science and Management (5) 494-505
Diversified grasslands that contain native plant species can produce biofuels, support sustainable grazing systems, and produce other ecosystem services. However, ecosystem service production can be disrupted by invasion of exotic perennial plants, and these plants can have soil-microbial “legacies” that may interfere with establishment and maintenance of diversified grasslands even...
Erratum to Dynamic stresses, Coulomb failure, and remote triggering and to Surface wave potential for triggering tectonic (nonvolcanic) tremor
David P. Hill
2012, Bulletin of the Seismological Society of America (102) 2795-2795
Hill (2008) and Hill (2010) contain two technical errors: (1) a missing factor of 2 for computed Love‐wave amplitudes, and (2) a sign error in the off‐diagonal elements in the Euler rotation matrix....
Range overlap and individual movements during breeding season influence genetic relationships of caribou herds in south-central Alaska
Gretchen H. Roffler, Layne G. Adams, Sandra L. Talbot, George K. Sage, Bruce W. Dale
2012, Canadian Journal of Zoology (93) 1318-1330
North American caribou (Rangifer tarandus) herds commonly exhibit little nuclear genetic differentiation among adjacent herds, although available evidence supports strong demographic separation, even for herds with seasonal range overlap. During 1997–2003, we studied the Mentasta and Nelchina caribou herds in south-central Alaska using radiotelemetry to determine individual movements and range...
Diversity of nitrogen isotopes and protein status in caribou: implications for monitoring northern ungulates
David D. Gustine, Perry S. Barboza, James P. Lawler, Layne G. Adams, Kathy L. Parker, Steve M. Arthur, Brad S. Shults
2012, Journal of Mammalogy (93) 778-790
Nutritional condition is an important determinant of productivity and survival in caribou (Rangifer tarandus). We used samples of excreta (n = 1,150) to estimate diet composition from microhistology and 2 isotopic proxies of protein status for 2 ecotypes of caribou in 4 herds in late winter (2006–2008). Isotopes of nitrogen...
The current state of modeling
Randall J. Hunt, Chunmiao Zheng
2012, Ground Water (50) 329-333
No abstract available....
The science, information, and engineering needed to manage water availability and quality in 2050
Robert M. Hirsch
2012, Book chapter, Toward a sustainable water future: Visions for 2050
This chapter explores four water resources issues: 1) hydrologic variability, hazards, water supply and ecosystem preservation; 2) urban landscape design; 3) non-point source water quality, and 4) climate change, resiliency, and nonstationarity. It also considers what science, technology, and engineering practice may be needed in the coming decades to...
Explosive eruptions triggered by rockfalls at Kīlauea volcano, Hawaii
Tim R. Orr, Weston A. Thelen, Matthew R. Patrick, Donald A. Swanson, David C. Wilson
2012, Geology (41) 207-210
Ongoing eruptive activity at Kīlauea volcano’s (Hawai‘i) summit has been controlled in part by the evolution of its vent from a 35-m-diameter opening into a collapse crater 150 m across. Geologic observations, in particular from a network of webcams, have provided an unprecedented look at collapse crater development, lava lake...
Near-surface, marine seismic-reflection data defines potential hydrogeologic confinement bypass in a tertiary carbonate aquifer, southeastern Florida
Kevin J. Cunningham, Cameron Walker, Richard L. Westcott
2012, SEG Technical Program Expanded Abstracts (2012) 1-6
Approximately 210 km of near-surface, high-frequency, marine seismic-reflection data were acquired on the southeastern part of the Florida Platform between 2007 and 2011. Many high-resolution, seismic-reflection profiles, interpretable to a depth of about 730 m, were collected on the shallow-marine shelf of southeastern Florida in water as shallow as 1...
Small population size of Pribilof Rock Sandpipers confirmed through distance-sampling surveys in Alaska
Daniel R. Ruthrauff, T. Lee Tibbitts, Robert E. Gill Jr., Maksim N. Dementyev, Colleen M. Handel
2012, Condor (114) 544-551
The Rock Sandpiper (Calidris ptilocnemis) is endemic to the Bering Sea region and unique among shorebirds in the North Pacific for wintering at high latitudes. The nominate subspecies, the Pribilof Rock Sandpiper (C. p. ptilocnemis), breeds on four isolated islands in the Bering Sea and appears to spend the winter...
An exploratory investigation of the landscape-lake interface: Land cover controls over consumer N and C isotopic composition in Lake Michigan rivermouths
James H. Larson, William B. Richardson, Jonathan M. Vallazza, J. C. Nelson
2012, Journal of Great Lakes Research (38) 610-619
Rivermouth ecosystems are areas where tributary waters mix with lentic near-shore waters and provide habitat for many Laurentian Great Lakes fish and wildlife species. Rivermouths are the interface between terrestrial activities that influence rivers and the ecologically important nearshore. Stable isotopes of nitrogen (N) and carbon (C) in consumers were...
Heavy tails and earthquake probabilities
William L. Ellsworth
2012, Seismological Research Letters (83) 483-485
The 21st century has already seen its share of devastating earthquakes, some of which have been labeled as “unexpected,” at least in the eyes of some seismologists and more than a few journalists. A list of seismological surprises could include the 2004 Sumatra-Andaman Islands; 2008 Wenchuan, China; 2009 Haiti; 2011...
The native Florida Green Watersnak, Nerodia floridana (Goff 1936) , preying upon the nonindigenous African Jewelfish, Hemichromis letourneuxi Sauvage 1880, in Florida.
Kenneth L. Krysko, Stephen J. Walsh, Robert H. Robins
2012, IRCF Reptiles & Amphibians (19) 161-162
No abstract available...
Using hydrogeology to identify the source of groundwater to Montezuma Well, a natural spring in central Arizona: part 1
Raymond H. Johnson, Ed H. DeWitt, L. Rick Arnold
2012, Environmental Earth Sciences (67) 1821-1835
Montezuma Well is a natural spring located within a “sinkhole” in the desert environment of the Verde Valley in Central Arizona. It is managed by the National Park Service as part of Montezuma Castle National Monument. Because of increasing development of groundwater in the area, this research was undertaken to...
Measuring the orthogonality error of coil systems
B. Heilig, A. Csontos, K. Pajunpaa, Tim White, B. St. Louis, D. Calp
2012, Proceedings of the XVth IAGA Workshop on Geomagnetic Observatory Instruments 42-45
Recently, a simple method was proposed for the determination of pitch angle between two coil axes by means of a total field magnetometer. The method is applicable when the homogeneous volume in the centre of the coil system is large enough to accommodate the total field sensor. Orthogonality of calibration...
Synthesis of benthic flux components in the Patos Lagooncoastal zone, Rio Grande do Sul, Brazil
Jeffrey N. King
2012, Water Resources Research (48)
The primary objective of this work is to synthesize components of benthic flux in the Patos Lagoon coastal zone, Rio Grande do Sul, Brazil. Specifically, the component of benthic discharge flux forced by the terrestrial hydraulic gradient is 0.8 m3 d-1; components of benthic discharge and recharge flux associated with...
Sulfur, carbon, hydrogen, and oxygen isotope geochemistry of the Idaho cobalt belt
Craig A. Johnson, Arthur A. Bookstrom, John F. Slack
2012, Economic Geology (107) 1207-1221
Cobalt-copper ± gold deposits of the Idaho cobalt belt, including the deposits of the Blackbird district, have been analyzed for their sulfur, carbon, hydrogen, and oxygen isotope compositions to improve the understanding of ore formation. Previous genetic hypotheses have ranged widely, linking the ores to the sedimentary or diagenetic history...
Changing climate, changing forests: the impacts of climate change on forests of the northeastern United States and eastern Canada
Lindsey Rustad, John Campbell, Jeffrey S. Dukes, Thomas Huntington, Kathy Fallon Lambert, Jacqueline Mohan, Nicholas Rodenhouse
2012, General Technical Report NRS-99
Decades of study on climatic change and its direct and indirect effects on forest ecosystems provide important insights for forest science, management, and policy. A synthesis of recent research from the northeastern United States and eastern Canada shows that the climate of the region has become warmer and wetter over...
Sources and sinks of nitrogen and phosphorus to a deep, oligotrophic lake, Lake Crescent, Olympic National Park, Washington
P.W. Moran, S.E. Cox, S.S. Embrey, R.L. Huffman, T. D. Olsen, S.C. Fradkin
2012, Scientific Investigations Report 2012-5107
Lake Crescent, in Olympic National Park in the northwest corner of Washington State is a deep-water lake renowned for its pristine water quality and oligotrophic nature. To examine the major sources and sinks of nutrients (as total nitrogen, total phosphorus, and dissolved nitrate), a study was conducted in the Lake...
Pacific salmon (Oncorhynchus spp.) runs and consumer fitness: growth and energy storage in stream-dwelling salmonids increase with salmon spawner density
Daniel J. Rinella, Mark S. Wipfli, Craig A. Stricker, Ron A. Heintz, Matthew J. Rinella
2012, Canadian Journal of Fisheries and Aquatic Sciences (69) 73-84
We examined how marine-derived nutrients (MDN), in the form of spawning Pacific salmon, influenced the nutritional status and δ15N of stream-dwelling fishes. We sampled juvenile coho salmon (Oncorhynchus kisutch) and Dolly Varden (Salvelinus malma) during spring and fall from 11 south-central Alaskan streams that ranged widely in spawning salmon biomass...
Reducing fungal infections and testing tag loss in juvenile Pacific lampreys implanted with passive integrated transponders.
H.E. Christiansen, L.P. Gee, M.G. Mesa
2012, Report
Pacific lamprey Entosphenus tridentatus are facing severe population declines, yet little is known about juvenile lamprey passage, life history, or adult return rates because until now, these small fish could not be tagged for unique identification of live individuals. Previously, we developed a simple and effective method for tagging juvenile...
On the causes of mid-Pliocene warmth and polar amplification
Daniel J. Lunt, Alan M. Haywood, Gavin A. Schmidt, Ulrich Salzmann, Paul J. Valdes, Harry J. Dowsett, Claire A. Loptson
2012, Earth and Planetary Science Letters (321-322) 128-138
The mid-Pliocene (~ 3 to 3.3 Ma ago), is a period of sustained global warmth in comparison to the late Quaternary (0 to ~ 1 Ma ago), and has potential to inform predictions of long-term future climate change. However, given that several processes potentially contributed, relatively little is understood about...
Magnetostratigraphy susceptibility for the Guadalupian Series GSSPs (Middle Permian) in Guadalupe Mountains National Park and adjacent areas in West Texas
Bruce R. Wardlaw, Brooks B. Ellwood, Lance L. Lambert, Jonathan H. Tomkin, Gordon L. Bell, Galina P. Nestell
2012, Geological Society, London, Special Publications (373) 21-21
Here we establish a magnetostratigraphy susceptibility zonation for the three Middle Permian Global boundary Stratotype Sections and Points (GSSPs) that have recently been defined, located in Guadalupe Mountains National Park, West Texas, USA. These GSSPs, all within the Middle Permian Guadalupian Series, define (1) the base of the Roadian Stage...
Duststones on Mars: Source, transport, deposition and erosion
Nathan T. Bridges, Daniel R. Muhs
2012, SEPM Special Publication (120) 169-182
Dust is an abundant material on Mars, and there is strong evidence that it is a contributor to the rock record as “duststone,” analogous in many ways to loess on Earth. Although a common suite of dust formation mechanisms has operated on the two planets, fundamental differences in environments and...
Associations between forest fragmentation patterns and geneticstructure in Pfrimer’s Parakeet (Pyrrhura pfrimeri), an endangered endemic to central Brazil’s dry forests
Susan M. Haig, Leonard F. Miller, Carlos Bianchi, Thomas D. Mullins
2012, Conservation Genetics (13)
When habitat becomes fragmented, populations of species may become increasingly isolated. In the absence of habitat corridors, genetic structure may develop and populations risk reductions in genetic diversity from increased genetic drift and inbreeding. Deforestation of the Cerrado biome of Brazil, particularly of the dry forests within the Parana˜ River...
