Sonoran Basin and Range Ecoregion: Chapter 30 in Status and trends of land change in the Western United States--1973 to 2000
James P. Calzia, Tamara S. Wilson
2012, Professional Paper 1794-A-30
The Sonoran Basin and Range Ecoregion covers approximately 116,364 km2 (44,928 mi2) of desert landscape in southeastern California and southwestern Arizona (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). This ecoregion is bounded on the west by the Southern and Central California Chaparral and Oak Woodlands and the Southern...
High-resolution tephrochronology of the Wilson Creek Formation (Mono Lake, California) and Laschamp event using 238U-230Th SIMS dating of accessory mineral rims
Jorge A. Vazquez, Marsha I. Lidzbarski
2012, Earth and Planetary Science Letters (357-358) 54-67
Sediments of the Wilson Creek Formation surrounding Mono Lake preserve a high-resolution archive of glacial and pluvial responses along the eastern Sierra Nevada due to late Pleistocene climate change. An absolute chronology for the Wilson Creek stratigraphy is critical for correlating the paleoclimate record to other archives in the western...
Coast Range Ecoregion: Chapter 1 in Status and trends of land change in the Western United States--1973 to 2000
Terry L. Sohl
2012, Professional Paper 1794-A-1
The Coast Range Ecoregion, which covers approximately 57,338 km2 (22,138 mi2), is a thin, linear ecoregion along the Pacific Coast, stretching roughly 1,300 km from the Olympic Peninsula, in northwest Washington, to an area south of San Francisco, California (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). It is...
Puget Lowland Ecoregion: Chapter 2 in Status and trends of land change in the Western United States--1973 to 2000
Daniel G. Sorenson
2012, Professional Paper 1794-A-2
The Puget Lowland Ecoregion covers an area of approximately 18,009 km² (6,953 mi²) within northwestern Washington (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). The ecoregion is located between the Coast Range Ecoregion to the west, which includes the Olympic Mountains, and the North Cascades and the Cascades Ecoregions...
Willamette Valley Ecoregion: Chapter 3 in Status and trends of land change in the Western United States--1973 to 2000
Tamara S. Wilson, Daniel G. Sorenson
2012, Professional Paper 1794-A-3
The Willamette Valley Ecoregion (as defined by Omernik, 1987; U.S. Environmental Protection Agency, 1997) covers approximately 14,458 km² (5,582 mi2), making it one of the smallest ecoregions in the conterminous United States. The long, alluvial Willamette Valley, which stretches north to south more than 193 km and ranges from 32...
Canadian Rockies Ecoregion: Chapter 4 in Status and trends of land change in the Western United States--1973 to 2000
Janis L. Taylor
2012, Professional Paper 1794-A-4
The Canadian Rockies Ecoregion covers approximately 18,494 km2 (7,141 mi2) in northwestern Montana (Omernik, 1987; U.S. Environmental Protection Agency, 1997). The east side of the ecoregion is bordered by the Montana Valley and Foothill Prairies Ecoregion, which also forms a large part of the western border of the ecoregion. In...
Middle Rockies Ecoregion: Chapter 5 in Status and trends of land change in the Western United States--1973 to 2000
Janis L. Taylor
2012, Professional Paper 1794-A-5
The Middle Rockies Ecoregion—characterized by steep, high-elevation mountain ranges and intermountain valleys—is a disjunct ecoregion composed of three distinct geographic areas: the Greater Yellowstone area in northwest Wyoming, southwest Montana, and eastern Idaho; the Bighorn Mountains in north-central Wyoming and south-central Montana; and the Black Hills in western South Dakota...
Montana Valley and Foothill Prairies Ecoregion: Chapter 6 in Status and trends of land change in the Western United States--1973 to 2000
Janis L. Taylor
2012, Professional Paper 1794-A-6
The Montana Valley and Foothill Prairies Ecoregion comprises numerous intermountain valleys and low-elevation foothill prairies spread across the western half of Montana, on both sides of the Continental Divide (Omernik, 1987; U.S. Environmental Protection Agency, 1997). The ecoregion, which covers approximately 64,658 km2 (24,965 mi2), includes the Flathead Valley and...
Northern Rockies Ecoregion: Chapter 7 in Status and trends of land change in the Western United States--1973 to 2000
Janis L. Taylor
2012, Professional Paper 1794-A-7
The Northern Rockies Ecoregion (Omernik, 1987; U.S. Environmental Protection Agency, 1997) covers approximately 162,746 km2 (63,200 mi2), primarily in Idaho but also including areas in western Montana and northeastern Washington (fig. 1). Canada forms the northern border of the ecoregion. To the west it is bordered by the Columbia Plateau...
Southern Rockies Ecoregion: Chapter 8 in Status and trends of land change in the Western United States--1973 to 2000
Mark A. Drummond
2012, Professional Paper 1794-A-8
The Southern Rockies Ecoregion is a high-elevation mountainous ecoregion that covers approximately 138,854 km2 (53,612 mi2), including much of central Colorado and parts of southern Wyoming and northern New Mexico (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). It abuts six other ecoregions: the Wyoming Basin and Colorado Plateaus...
High shrew diversity on Alaska's Seward Peninsula: Community assembly and environmental change
Andrew G. Hope
2012, Northwestern Naturalist (93) 101-110
In September 2010, 6 species of shrews (genus: Sorex) were collected at a single locality on the Seward Peninsula of Alaska. Such high sympatric diversity within a single mammalian genus is seldom realized. This phenomenon at high latitudes highlights complex Arctic community dynamics that reflect significant turnover through time as...
Wasatch and Uinta Mountains Ecoregion: Chapter 9 in Status and trends of land change in the Western United States--1973 to 2000
Mark S. Brooks
2012, Professional Paper 1794-A-9
The Wasatch and Uinta Mountains Ecoregion covers approximately 44,176 km2 (17, 057 mi2) (fig. 1) (Omernik, 1987; U.S. Environmental Protection Agency, 1997). With the exception of a small part of the ecoregion extending into southern Wyoming and southern Idaho, the vast majority of the ecoregion is located along the eastern...
Cascades Ecoregion: Chapter 11 in Status and trends of land change in the Western United States--1973 to 2000
Daniel G. Sorenson
2012, Professional Paper 1794-A-11
The Cascades Ecoregion (Omernik, 1987; U.S. Environmental Protection Agency, 1997) covers approximately 46,787 km2 (18,064 mi2) in Washington, Oregon, and California (fig. 1). The main body of the ecoregion extends from Snoqualmie Pass, Washington, in the north, to Hayden Mountain, near State Highway 66 in southern Oregon. Also included in...
Epidemiology of a Salmonella enterica subsp. Enterica serovar Typhimurium strain associated with a songbird outbreak.
David S. Blehert, Sonia M. Hernandez, Kevin Keel, Susan Sanchez, Eija Trees, Peter Gerner-Smidt
2012, Applied and Environmental Microbiology (78) 7290-7298
Salmonella enterica subsp. enterica serovar Typhimurium is responsible for the majority of salmonellosis cases worldwide. This Salmonella serovar is also responsible for die-offs in songbird populations. In 2009, there was an S. Typhimurium epizootic reported in pine siskins in the eastern United States. At the time, there was also a...
Eastern Cascades Slopes and Foothills Ecoregion: Chapter 12 in Status and trends of land change in the Western United States--1973 to 2000
Daniel G. Sorenson
2012, Professional Paper 1794-A-12
The Eastern Cascades Slopes and Foothills Ecoregion (Omernik, 1987; U.S. Environmental Protection Agency, 1997) covers approximately 57,329 km² (22,135 mi²) in the states of Washington, Oregon, and California (fig. 1). The ecoregion is bounded on the east by the Columbia Plateau, Blue Mountains, and Northern Basin and Range Ecoregions; on...
Cenozoic tectono-thermal history of the Tordrillo Mountains, Alaska: Paleocene-Eocene ridge subduction, decreasing relief, and late Neogene faulting
Jeff A. Benowitz, Peter J. Haeussler, Paul W. Layer, Paul B. O'Sullivan, Wes K. Wallace, Robert J. Gillis
2012, Geochemistry, Geophysics, Geosystems (13)
Topographic development inboard of the continental margin is a predicted response to ridge subduction. New thermochronology results from the western Alaska Range document ridge subduction related orogenesis. K-feldspar thermochronology (KFAT) of bedrock samples from the Tordrillo Mountains in the western Alaska Range complement existing U-Pb, 40Ar/39Ar and AFT (apatite fission track)...
Characterizing post-drainage succession in Thermokarst Lake Basins on the Seward Peninsula, Alaska with TerraSAR-X Backscatter and Landsat-based NDVI data
Prajna Regmi, Guido Grosse, Miriam C. Jones, Benjamin M. Jones, Katey Walter Anthony
2012, Remote Sensing (4) 3741-3765
Drained thermokarst lake basins accumulate significant amounts of soil organic carbon in the form of peat, which is of interest to understanding carbon cycling and climate change feedbacks associated with thermokarst in the Arctic. Remote sensing is a tool useful for understanding temporal and spatial dynamics of drained basins. In...
Hydrostratigraphic interpretation of test-hole and surface geophysical data, Elkhorn and Loup River Basins, Nebraska, 2008 to 2011
Christopher M. Hobza, Paul A. Bedrosian, Benjamin R. Bloss
2012, Open-File Report 2012-1227
The Elkhorn-Loup Model (ELM) was begun in 2006 to understand the effect of various groundwater-management scenarios on surface-water resources. During phase one of the ELM study, a lack of subsurface geological information was identified as a data gap. Test holes drilled to the base of the aquifer in the ELM...
Application of empirical predictive modeling using conventional and alternative fecal indicator bacteria in eastern North Carolina waters
Raul Gonzalez, Kathleen E. Conn, Joey Crosswell, Rachel Noble
2012, Water Research (46) 5871-5882
Coastal and estuarine waters are the site of intense anthropogenic influence with concomitant use for recreation and seafood harvesting. Therefore, coastal and estuarine water quality has a direct impact on human health. In eastern North Carolina (NC) there are over 240 recreational and 1025 shellfish harvesting water quality monitoring sites...
Spatial and temporal trends of freshwater mussel assemblages in the Meramec River Basin, Missouri, USA
Jo Ellen Hinck, Stephen E. McMurray, Andrew D. Roberts, M. Christopher Barnhart, Christopher G. Ingersoll, Ning Wang, Tom Augspurger
2012, Journal of Fish and Wildlife Management (3) 319-331
The Meramec River basin in east-central Missouri has one of the most diverse unionoid mussel faunas in the central United States with >40 species identified. Data were analyzed from historical surveys to test whether diversity and abundance of mussels in the Meramec River basin (Big, Bourbeuse, and Meramec rivers, representing...
Proceedings of the workshop on alternative futures: Accounting for growth in the Chesapeake Bay watershed
Peter R. Claggett, Renee L. Thompson, editor(s)
2012, Open-File Report 2012-1216
This workshop provided a forum for identifying and discussing policies and assumptions for use in creating regionally consistent alternative future land-use scenarios. The alternative scenarios will help to inform how planning can potentially be used as a primary Best Management Practice by identifying land-use policies and other planning actions that...
Global exploration and production capacity for platinum-group metals from 1995 through 2015
David R. Wilburn
2012, Scientific Investigations Report 2012-5164
Platinum-group metals (PGMs) are required in a variety of commercial, industrial, and military applications for many existing and emerging technologies, yet the United States is highly dependent on foreign sources of PGMs. Information on global exploration for PGMs since 1995 has been used in this study as a basis for...
Landscape consequences of natural gas extraction in Greene and Tioga Counties, Pennsylvania, 2004-2010
E.T. Slonecker, L.E. Milheim, C.M. Roig-Silva, G.B. Fisher
2012, Open-File Report 2012-1220
Increased demands for cleaner burning energy, coupled with the relatively recent technological advances in accessing unconventional hydrocarbon-rich geologic formations, have led to an intense effort to find and extract natural gas from various underground sources around the country. One of these sources, the Marcellus Shale, located in the Allegheny Plateau,...
Recent population trends of mountain goats in the Olympic Mountains, Washington
Kurt J. Jenkins, Patricia J. Happe, Katherine F. Beirne, Roger A. Hoffman, Paul C. Griffin, William T. Baccus, John Fieberg
2012, Northwest Science (86) 264-275
Mountain goats (Oreamnos americanus) were introduced in Washington's Olympic Mountains during the 1920s. The population subsequently increased in numbers and expanded in range, leading to concerns by the 1970s over the potential effects of non-native mountain goats on high-elevation plant communities in Olympic National Park. The National Park Service (NPS)...
Early Tertiary exhumation of the flank of a forearc basin, southwest Talkeetna Mountains, Alaska
Heather A. Bleick, Alison B. Till, Dwight Bradley, Paul O’Sullivan, Joe L. Wooden, Dan B. Bradley, Theresa A. Taylor, Sam B. Friedman, Chad P. Hults
2012, Open-File Report 2012-1232
New geochronologic and thermochronologic data from rocks near Hatcher Pass, southwest Talkeetna Mountains, Alaska, record earliest Paleocene erosional and structural exhumation on the flank of the active Cook Inlet forearc basin. Cretaceous plutons shed sediments to the south, forming the Paleocene Arkose Ridge Formation. A Paleocene(?)-Eocene detachment fault juxtaposed ~60...
