Correlation of the Miocene Peach Spring Tuff with the geomagnetic polarity time scale and new constraints on tectonic rotations in the Mojave Desert, California
John W. Hillhouse, David M. Miller, Brent D. Turrin
2010, Conference Paper, Overboard in the Mojave: 20 million years of lakes and wetlands
We report new paleomagnetic results and 40Ar/39Ar ages from the Peach Spring Tuff (PST), a key marker bed that occurs in the desert region between Barstow, California, and Peach Springs, Arizona. The 40Ar/39Ar ages were determined using individual hand-picked sanidine crystals from ash-flow specimens used in previous paleomagnetic studies at eight sites...
Hydrology, water quality, and causes of changes in vegetation in the vicinity of the Spring Bluff Nature Preserve, Lake County, Illinois, May 2007–August 2008
Robert T. Kay, James J. Miner, Debbie A. Maurer, Charles W. Knight
2010, Scientific Investigations Report 2009-5237
Agriculture and urbanization have altered the hydrology and water quality of the coastal wetland complex along the shore of Lake Michigan at the Spring Bluff Nature Preserve and Illinois Beach State Park in northeastern Lake County, Ill., and the adjacent Chiwaukee Prairie State Natural Area in southeastern Wisconsin. Culverts, roads,...
Habitat selection and abundance of young-of-year smallmouth bass in north temperate lakes
Peter James Brown, Michael A. Bozek
2010, Transactions of the American Fisheries Society (139) 1247-1260
Habitat use during early life history plays an important role in the ecology of smallmouth bass Micropterus dolomieu in north temperate lakes. The highest levels of mortality occur during the first year of life, and the habitat selected probably affects mortality. We used resource selection functions and abundance data from two...
Measuring bulrush culm relationships to estimate plant biomass within a southern California treatment wetland
Joan S. Daniels, Brian S. Cade, James J. Sartoris
2010, Wetlands (30) 231-239
Assessment of emergent vegetation biomass can be time consuming and labor intensive. To establish a less onerous, yet accurate method, for determining emergent plant biomass than by direct measurements we collected vegetation data over a six-year period and modeled biomass using easily obtained variables: culm (stem) diameter, culm height and...
Reconnaissance geochronology of tuffs in the Miocene Barstow Formation: Implications for basin evolution and tectonics in the central Mojave Desert
David M. Miller, Shannon R. Leslie, John W. Hillhouse, Joseph L. Wooden, Jorge A. Vazquez, R. E. Reynolds
2010, Conference Paper, Overboard in the Mojave: 20 million years of lakes and wetlands
Early to middle Miocene lacustrine strata of the Barstow Formation are well dated in just a few places, limiting our ability to infer basin evolution and regional tectonics. At the type section in the Mud Hills, previous studies have shown that the lacustrine interval of the Barstow Formation is between...
Stratigraphy, age, and depositional setting of the Miocene Barstow Formation at Harvard Hill, central Mojave Desert, California
Shannon R. Leslie, David M. Miller, Joseph L. Wooden, Jorge A. Vazquez
2010, Conference Paper, Overboard in the Mojave: 20 million years of lakes and wetlands
New detailed geologic mapping and geochronology of the Barstow Formation at Harvard Hill, 30 km east of Barstow, CA, help to constrain Miocene paleogeography and tectonics of the central Mojave Desert. A northern strand of the Quaternary ENE-striking, sinistral Manix fault divides the Barstow Formation at Harvard Hill into two...
Stratigraphy and Mesozoic–Cenozoic tectonic history of northern Sierra Los Ajos and adjacent areas, Sonora, Mexico
William R. Page, Floyd Gray, Alexander Iriondo, Daniel P. Miggins, Robert B. Blodgett, Florian Maldonado, Robert J. Miller
2010, Journal of South American Earth Sciences (29) 557-571
Geologic mapping in the northern Sierra Los Ajos reveals new stratigraphic and structural data relevant to deciphering the Mesozoic–Cenozoic tectonic evolution of the range. The northern Sierra Los Ajos is cored by Proterozoic, Cambrian, Devonian, Mississippian, and Pennsylvanian strata, equivalent respectively to the Pinal Schist, Bolsa Quartzite and Abrigo...
Using generalized linear models to estimate selectivity from short-term recoveries of tagged red drum Sciaenops ocellatus: Effects of gear, fate, and regulation period
Nathan M. Bacheler, Joseph E. Hightower, Summer M. Burdick, Lee M. Paramore, Jeffrey A. Buckel, Kenneth H. Pollock
2010, Fisheries Research (102) 266-275
Estimating the selectivity patterns of various fishing gears is a critical component of fisheries stock assessment due to the difficulty in obtaining representative samples from most gears. We used short-term recoveries (n = 3587) of tagged red drum Sciaenops ocellatus to directly estimate age- and length-based selectivity patterns using generalized linear models. The most...
Stable isotopes differentiate bottlenose dolphins off west-central Florida
Nélio B. Barros, P. H. Ostrom, Craig A. Stricker, R.S. Wells
2010, Marine Mammal Science (26) 324-336
Distinguishing discrete population units among continuously distributed coastal small cetaceans is challenging and crucial to conservation. We evaluated the utility of stable isotopes in assessing group membership in bottlenose dolphins (Tursiops truncatus) off west-central Florida by analyzing carbon, nitrogen, and sulfur isotope values (δ13C, δ15N, and δ34S) of tooth collagen...
Viral hemorrhagic septicemia virus (VHSV IVb) risk factors and association measures derived by expert panel
VHSV Expert Panel And Working Group
2010, Preventive Veterinary Medicine 128-139
Viral hemorrhagic septicemia virus (VHSV) is an OIE-listed pathogen of fish, recently expanding in known host and geographic range in North America. Through a group process designed for subjective probability assessment, an international panel of fish health experts identified and weighted risk factors perceived important to the emergence and spread...
Organochlorine and PBDE concentrations in relation to cytochrome P450 activity in livers of Forster’s Terns (Sterna forsteri) and Caspian Terns (Hydroprogne caspia), in San Francisco Bay, California
Garth Herring, Joshua T. Ackerman, Collin A. Eagles-Smith, Terrence L. Adelsbach, Mark J. Melancon, Katie R. Stebbins, David J. Hoffman
2010, Archives of Environmental Contamination and Toxicology (58) 863-873
We measured halogenated organic contaminants (HOCs) [polybrominated diphenyl ethers (PBDEs), polychlorinated biphenyls (PCBs), and dichloro-diphenyl-trichloroethane (DDT)] and P450 [e.g., ethoxyresorufin-O-dealkylase (EROD)] stress in livers from Caspian tern (Hydroprogne caspia) adults and Forster’s tern (Sterna forsteri) adults and chicks in San Francisco Bay (SFB). Penta...
Climate-induced tree mortality: Earth system consequences
Henry D. Adams, Alison K. Macalady, David D. Breshears, Craig D. Allen, Nathan L. Stephenson, Scott Saleska, Travis E. Huxman, Nathan G. McDowell
2010, Eos, Transactions, American Geophysical Union (91) 153-154
One of the greatest uncertainties in global environmental change is predicting changes in feedbacks between the biosphere and the Earth system. Terrestrial ecosystems and, in particular, forests exert strong controls on the global carbon cycle and influence regional hydrology and climatology directly through water and surface energy budgets [Bonan, 2008;...
Competitive interactions between a native spider (Frontinella communis, Araneae: Linyphiidae) and an invasive spider (Linyphia triangularis, Araneae: Linyphiidae)
Julie V. Bednarski, Howard S. Ginsberg, Elizabeth M. Jakob
2010, Biological Invasions (12) 905-912
There are numerous reports of spiders that have become established outside of their native ranges, but few studies examine their impact on native spiders. We examined the effect of the European hammock spider Linyphia triangularis (Araneae, Linyphiidae) on the native bowl-and-doily spider Frontinella communis (Araneae, Linyphiidae)...
Comparison of mercury in water, bottom sediment, and zooplankton in two Front Range reservoirs in Colorado, 2008-09
M. Alisa Mast, David P. Krabbenhoft
2010, Scientific Investigations Report 2010-5037
The U.S. Geological Survey, in cooperation with the Colorado Department of Public Health and Environment, conducted a study to investigate environmental factors that may contribute to the bioaccumulation of mercury in two Front Range reservoirs. One of the reservoirs, Brush Hollow Reservoir, currently (2009) has a fish-consumption advisory for mercury...
Examination of Libby, Montana, Fill Material for Background Levels of Amphibole from the Rainy Creek Complex Using Scanning Electron Microscopy and X-Ray Microanalysis
David T. Adams, William H. Langer, Todd M. Hoefen, Bradley S. Van Gosen, Gregory P. Meeker
2010, Open-File Report 2010-1056
Natural background levels of Libby-type amphibole in the sediment of the Libby valley in Montana have not, up to this point, been determined. The purpose of this report is to provide the preliminary findings of a study designed by both the U.S. Geological Survey and the U.S. Environmental Protection Agency...
Monitoring and Evaluation of Environmental Flow Prescriptions for Five Demonstration Sites of the Sustainable Rivers Project
Christopher P. Konrad
2010, Open-File Report 2010-1065
The Nature Conservancy has been working with U.S. Army Corps of Engineers (Corps) through the Sustainable Rivers Project (SRP) to modify operations of dams to achieve ecological objectives in addition to meeting the authorized purposes of the dams. Modifications to dam operations are specified in terms of environmental flow prescriptions...
Recent U.S. Geological Survey Studies in the Tintina Gold Province, Alaska, United States, and Yukon, Canada-Results of a 5-Year Project
Larry P. Gough, Warren C. Day
2010, Scientific Investigations Report 2007-5289
This report presents summary papers of work conducted between 2002 and 2007 under a 5-year project effort funded by the U.S. Geological Survey Mineral Resources Program, formerly entitled 'Tintina Metallogenic Province: Integrated Studies on Geologic Framework, Mineral Resources, and Environmental Signatures.' As the project progressed, the informal title changed from...
Dissolved-Solids Load in Henrys Fork Upstream from the Confluence with Antelope Wash, Wyoming, Water Years 1970-2009
Katharine Foster, Terry A. Kenney
2010, Scientific Investigations Report 2010-5048
Annual dissolved-solids load at the mouth of Henrys Fork was estimated by using data from U.S. Geological Survey streamflow-gaging station 09229500, Henrys Fork near Manila, Utah. The annual dissolved-solids load for water years 1970-2009 ranged from 18,300 tons in 1977 to 123,300 tons in 1983. Annual streamflows for this period...
Revised Subsurface Stratigraphic Framework of the Fort Union and Wasatch Formations, Powder River Basin, Wyoming and Montana
Romeo M. Flores, Brianne D. Spear, Peter A. Purchase, Craig M. Gallagher
2010, Open-File Report 2010-1061
Described in this report is an updated subsurface stratigraphic framework of the Paleocene Fort Union Formation and Eocene Wasatch Formation in the Powder River Basin (PRB) in Wyoming and Montana. This framework is graphically presented in 17 intersecting west-east and north-south cross sections across the basin. Also included are: (1)...
Simulation of Streamflow, Evapotranspiration, and Groundwater Recharge in the Lower San Antonio River Watershed, South-Central Texas, 2000-2007
Joy S. Lizarraga, Darwin J. Ockerman
2010, Open-File Report 2010-5027
The U.S. Geological Survey (USGS), in cooperation with the San Antonio River Authority, the Evergreen Underground Water Conservation District, and the Goliad County Groundwater Conservation District, configured, calibrated, and tested a watershed model for a study area consisting of about 2,150 square miles of the lower San Antonio River watershed...
eMODIS: A User-Friendly Data Source
Calli B. Jenkerson, Thomas Maiersperger, Gail Schmidt
2010, Open-File Report 2010-1055
The U.S. Geological Survey's (USGS) Earth Resources Observation and Science (EROS) Center is generating a suite of products called 'eMODIS' based on Moderate Resolution Imaging Spectroradiometer (MODIS) data acquired by the National Aeronautics and Space Administration's (NASA) Earth Observing System (EOS). With a more frequent repeat cycle than Landsat and...
Review of Oceanographic and Geochemical Data Collected in Massachusetts Bay during a Large Discharge of Total Suspended Solids from Boston's Sewage-Treatment System and Ocean Outfall in August 2002
Michael H. Bothner, Bradford Butman, Michael A. Casso
2010, Open-File Report 2010-1050
During the period August 14-23, 2002, the discharge of total suspended solids (TSS) from the Massachusetts Water Resources Authority sewage-treatment plant ranged from 32 to 132 milligrams per liter, causing the monthly average discharge to exceed the limit specified in the National Pollution Discharge Elimination System permit. Time-series monitoring data...
Publications of the Volcano Hazards Program 2008
Manuel Nathenson
2010, Open-File Report 2010-1052
The Volcano Hazards Program of the U.S. Geological Survey (USGS) is part of the Geologic Hazards Assessments subactivity as funded by Congressional appropriation. Investigations are carried out in the Geology and Hydrology Disciplines of the USGS and with cooperators at the Alaska Division of Geological and Geophysical Surveys, University of...
Water Quality of the Upper Delaware Scenic and Recreational River and Tributary Streams, New York and Pennsylvania
Jason Siemion, Peter S. Murdoch
2010, Scientific Investigations Report 2010-5009
Water-quality samples were collected from the Upper Delaware Scenic and Recreational River (UPDE) and its tributaries during the period October 1, 2005, to September 30, 2007, to document existing water quality, determine relations between land use and water quality, and identify areas of water-quality concern. A tiered water-quality monitoring framework...
Hydrogeologic framework, groundwater movement, and water budget in the Chambers-Clover Creek watershed and vicinity, Pierce County, Washington
Mark E. Savoca, Wendy B. Welch, Kenneth H. Johnson, R. C. Lane, Burt G. Clothier, Elisabeth T. Fasser
2010, Scientific Investigations Report 2010-5055
This report presents information used to characterize the groundwater-flow system in the Chambers-Clover Creek Watershed and vicinity, and includes descriptions of the geology and hydrogeologic framework; groundwater recharge and discharge; groundwater levels and flow directions; seasonal groundwater level fluctuations; interactions between aquifers and the surface-water system; and a water budget....
