Constraints on the depth of generation and emplacement of a magmatic epidote-bearing quartz diorite pluton in the Coast Plutonic Complex, British Columbia
J.M. Chang, C.L. Andronicos
2009, Terra Nova (21) 480-488
Petrology and P–T estimates indicate that a magmatic epidote-bearing quartz diorite pluton from Mt. Gamsby, Coast Plutonic Complex, British Columbia, was sourced at pressures below ∼1.4 GPa and cooled nearly isobarically at ∼0.9 GPa. The P–T path indicates that the magma was within the stability field of magmatic epidote...
Variable growth and longevity of yellow bullhead (Ameiurus natalis) in the Everglades of south Florida, USA
D.J. Murie, D.C. Parkyn, W.F. Loftus, L.G. Nico
2009, Journal of Applied Ichthyology (25) 740-745
Yellow bullhead (Ictaluridae: Ameiurus natalis) is the most abundant ictalurid catfish in the Everglades of southern Florida, USA, and, as both prey and predator, is one of many essential components in the ecological-simulation models used in assessing restoration success in the Everglades. Little is known of its biology and life...
Stratigraphic controls on seawater intrusion and implications for groundwater management, Dominguez Gap area of Los Angeles, California, USA
Tracy Nishikawa, Adam J. Siade, Eric G. Reichard, Daniel J. Ponti, A.G. Canales, T.A. Johnson
2009, Hydrogeology Journal (17) 1699-1725
Groundwater pumping has led to extensive water-level declines and seawater intrusion in coastal Los Angeles, California (USA). A SUTRA-based solute-transport model was developed to test the hydraulic implications of a sequence-stratigraphic model of the Dominguez Gap area and to assess the effects of water-management scenarios. The model is two-dimensional, vertical...
Afraid to Start Because the Outcome is Uncertain?: Social Site Characterization as a Tool for Informing Public Engagement Efforts
S. Wade, S. Greenberg
2009, Conference Paper, Energy Procedia
This paper introduces the concept of social site characterization as a parallel effort to technical site characterization to be used in evaluating and planning carbon dioxides capture and storage (CCS) projects. Social site characterization, much like technical site characterization, relies on a series of iterative investigations into public attitudes towards...
Rapid changes in small fish mercury concentrations in estuarine wetlands: Implications for wildlife risk and monitoring programs
Collin A. Eagles-Smith, Joshua T. Ackerman
2009, Environmental Science & Technology (43) 8658-8664
Small fish are commonly used to assess mercury (Hg) risk to wildlife and monitor Hg in wetlands. However, limited research has evaluated short-term Hg variability in small fish, which can have important implications for monitoring programs and risk assessment. We conducted a time-series study of Hg concentrations in two small...
Wild felids as hosts for human plague, Western United States
S.N. Bevins, J.A. Tracey, S.P. Franklin, V.L. Schmit, M.L. MacMillan, K.L. Gage, M.E. Schriefer, K.A. Logan, L.L. Sweanor, M.W. Alldredge, C. Krumm, W.M. Boyce, W. Vickers, S.P.D. Riley, L.M. Lyren, E. E. Boydston, Robert N. Fisher, M.E. Roelke, M. Salman, K.R. Crooks, S. VandeWoude
2009, Emerging Infectious Diseases (15) 2021-2024
Plague seroprevalence was estimated in populations pumas and bobcats in the western United States. High levels of exposure in plague-endemic regions indicate the need to consider the ecology and pathobiology of plague nondomestic felid hosts to better understand the role of these species in disease persistence and transmission....
Widespread occurrence of intersex in black basses (Micropterus spp.) from U.S. rivers, 1995-2004
J.E. Hinck, V. S. Blazer, C. J. Schmitt, D. M. Papoulias, D. E. Tillitt
2009, Aquatic Toxicology (95) 60-70
Intersex occurrence in freshwater fishes was evaluated for nine river basins in the United States. Testicular oocytes (predominantly male testes containing female germ cells) were the most pervasive form of intersex observed, even though similar numbers of male (n = 1477) and female (n = 1633) fish were examined. Intersex...
A method for assigning species into groups based on generalized Mahalanobis distance between habitat model coefficients
C.J. Williams, P.J. Heglund
2009, Environmental and Ecological Statistics (16) 495-513
Habitat association models are commonly developed for individual animal species using generalized linear modeling methods such as logistic regression. We considered the issue of grouping species based on their habitat use so that management decisions can be based on sets of species rather than individual species. This research was motivated...
Comparative endocrinology in the 21st century
R.J. Denver, P.M. Hopkins, S. D. McCormick, C.R. Propper, L. Riddiford, S.A. Sower, J.C. Wingfield
2009, Integrative and Comparative Biology (49) 339-348
Hormones coordinate developmental, physiological, and behavioral processes within and between all living organisms. They orchestrate and shape organogenesis from early in development, regulate the acquisition, assimilation, and utilization of nutrients to support growth and metabolism, control gamete production and sexual behavior, mediate organismal responses to environmental change, and allow for...
New geochronologic and stratigraphic evidence confirms the paleocene age of the dinosaur-bearing ojo alamo sandstone and animas formation in the San Juan Basin, New Mexico and Colorado
J.E. Fassett
2009, Palaeontologia Electronica (12)
Dinosaur fossils are present in the Paleocene Ojo Alamo Sandstone and Animas Formation in the San Juan Basin, New Mexico, and Colorado. Evidence for the Paleo-cene age of the Ojo Alamo Sandstone includes palynologic and paleomagnetic data. Palynologic data indicate that the entire Ojo Alamo Sandstone, including the lower dinosaur-bearing...
A case study of two M~5 mainshocks in Anza, California: Is the footprint of an aftershock sequence larger than we think?
Karen R. Fritts, Debi Kilb
2009, Bulletin of the Seismological Society of America (99) 2721-2735
It has been traditionally held that aftershocks occur within one to two fault lengths of the mainshock. Here we demonstrate that this perception has been shaped by the sensitivity of seismic networks. The 31 October 2001 Mw 5.0 and 12 June 2005 Mw 5.2 Anza mainshocks in southern California occurred in the middle of...
Instrumental record of debris flow initiation during natural rainfall: Implications for modeling slope stability
D. R. Montgomery, K. M. Schmidt, W. E. Dietrich, J. McKean
2009, Journal of Geophysical Research F: Earth Surface (114)
The middle of a hillslope hollow in the Oregon Coast Range failed and mobilized as a debris flow during heavy rainfall in November 1996. Automated pressure transducers recorded high spatial variability of pore water pressure within the area that mobilized as a debris flow, which initiated...
Impediments to predicting site response: Seismic property estimation and modeling simplifications
E.M. Thompson, L.G. Baise, R. E. Kayen, B.B. Guzina
2009, Bulletin of the Seismological Society of America (99) 2927-2949
We compare estimates of the empirical transfer function (ETF) to the plane SH-wave theoretical transfer function (TTF) within a laterally constant medium for invasive and noninvasive estimates of the seismic shear-wave slownesses at 13 Kiban-Kyoshin network stations throughout Japan. The difference between the ETF and either of the TTFs is...
Development of a local-scale urban stream assessment method using benthic macroinvertebrates: An example from the Santa Clara Basin, California
J.L. Carter, A.H. Purcell, S.V. Fend, V.H. Resh
2009, Journal of the North American Benthological Society (28) 1007-1021
Research that explores the biological response to urbanization on a site-specific scale is necessary for management of urban basins. Recent studies have proposed a method to characterize the biological response of benthic macroinvertebrates along an urban gradient for several climatic regions in the USA. Our study demonstrates how this general...
Timber harvest change in the Little North Santiam River Basin, Oregon, 1995 to 2009
Steven Sobieszczyk
2009, Report
Using available aerial photos from approximately a 15-year period, changes in timber harvest were mapped in the Little North Santiam River Basin, Oregon. Timber harvest plots as seen on digital orthophotos from 1995, 2000, 2005, and 2009 were digitized and attributed based on harvest type or purpose: clearcut, thinning, or...
Mineral resource of the month: cobalt
Kim B. Shedd
2009, Earth (54) 31-31
Cobalt is a metal used in numerous commercial, industrial and military applications. On a global basis, the leading use of cobalt is in rechargeable lithium-ion, nickel-cadmium and nickel-metal hydride battery electrodes. Cobalt use has grown rapidly since the early 1990s, with the development of new battery technologies and an increase...
Influences of wind-wave exposure on the distribution and density of recruit reef fishes at Kure and Pearl and Hermes Atolls, Northwestern Hawaiian Islands
E.E. DeMartini, B.J. Zgliczynski, R.C. Boland, A. M. Friedlander
2009, Environmental Biology of Fishes (85) 319-332
This paper describes the results of a field survey designed to test the prediction that the density of benthic juveniles of shallow-reef fishes is greater on wind-wave "exposed" sectors of a pair of isolated oceanic atolls (Kure, Pearl and Hermes) at the far northwestern end of the Hawaiian Islands, an...
High-quality unsaturated zone hydraulic property data for hydrologic applications
Kimberlie Perkins, John R. Nimmo
2009, Water Resources Research (45)
In hydrologic studies, especially those using dynamic unsaturated zone moisture modeling, calculations based on property transfer models informed by hydraulic property databases are often used in lieu of measured data from the site of interest. Reliance on database-informed predicted values has become increasingly common with the use of neural networks....
Legacy effects of colonial millponds on floodplain sedimentation, bank erosion, and channel morphology, MID-Atlantic, USA
E.R. Schenk, C.R. Hupp
2009, Journal of the American Water Resources Association (45) 597-606
Many rivers and streams of the Mid-Atlantic Region, United States (U.S.) have been altered by postcolonial floodplain sedimentation (legacy sediment) associated with numerous milldams. Little Conestoga Creek, Pennsylvania, a tributary to the Susquehanna River and the Chesapeake Bay, is one of these streams. Floodplain sedimentation rates, bank erosion rates, and...
Phylogeny and phylogenetic classification of the antbirds, ovenbirds, woodcreepers, and allies (Aves: Passeriformes: Infraorder Furnariides)
R.G. Moyle, R.T. Chesser, R.T. Brumfield, J.G. Tello, D.J. Marchese, J. Cracraft
2009, Cladistics (25) 386-405
The infraorder Furnariides is a diverse group of suboscine passerine birds comprising a substantial component of the Neotropical avifauna. The included species encompass a broad array of morphologies and behaviours, making them appealing for evolutionary studies, but the size of the group (ca. 600 species) has limited well-sampled higher-level phylogenetic...
Geological evolution of the Neoproterozoic Bemarivo Belt, northern Madagascar
Ronald J. Thomas, B. De Waele, D. I. Schofield, K. M. Goodenough, M. Horstwood, R. Tucker, W. Bauer, R. Annells, K. J. Howard, G. Walsh, M. Rabarimanana, J. M. Rafahatelo, A.V. Ralison, T. Randriamananjara
2009, Precambrian Research (172) 279-300
The broadly east-west trending, Late Neoproterozoic Bemarivo Belt in northern Madagascar has been re-surveyed at 1:100 000 scale as part of a large multi-disciplinary World Bank-sponsored project. The work included acquisition of 14 U-Pb zircon dates and whole-rock major and trace element geochemical data of representative rocks. The belt has...
Warmwater fish in wadeable streams
Charles F. Rabeni, John J. Lyons, Norman Mercado-Silva, James T. Peterson
Scott A. Bonar, Wayne A. Hubert, David W. Willis, editor(s)
2009, Book chapter, Standard methods for sampling North American freshwater fishes
Both “warmwater” and “wadeable” are terms of convenience without precise definition and are used by biologists to describe streams that are generally too warm to have sustainable salmonid populations and can be safely traversed by walking (i.e., a section of stream should have the majority of its length less than...
Climate alters response of an endemic island plant to removal of invasive herbivores
Mceachern A. Kathryn, D.M. Thomson, K.A. Chess
2009, Ecological Applications (19) 1574-1584
Islands experience higher rates of species extinction than mainland ecosystems, with biological invasions among the leading causes; they also serve as important model systems for testing ideas in basic and applied ecology. Invasive removal programs on islands are conservation efforts that can also be viewed as powerful manipulative experiments, but...
Obtaining parsimonious hydraulic conductivity fields using head and transport observations: A Bayesian geostatistical parameter estimation approach
Michael N. Fienen, R. Hunt, D. Krabbenhoft, T. Clemo
2009, Water Resources Research (45)
Flow path delineation is a valuable tool for interpreting the subsurface hydrogeochemical environment. Different types of data, such as groundwater flow and transport, inform different aspects of hydrogeologic parameter values (hydraulic conductivity in this case) which, in turn, determine flow paths. This work combines flow and transport information to estimate...
Gas hydrate saturations estimated from fractured reservoir at Site NGHP-01-10, Krishna-Godavari Basin, India
Myung W. Lee, T. S. Collett
2009, Journal of Geophysical Research B: Solid Earth (114)
During the Indian National Gas Hydrate Program Expedition 01 (NGHP-Ol), one of the richest marine gas hydrate accumulations was discovered at Site NGHP-01-10 in the Krishna-Godavari Basin. The occurrence of concentrated gas hydrate at this site is primarily controlled by the presence of fractures. Assuming the resistivity of gas hydratebearing...
