Geologic map of the Topock 7.5’ quadrangle, Arizona and California
Keith A. Howard, Barbara E. John, Jane E. Nielson, Julia M. G. Miller, Joseph L. Wooden
2013, Scientific Investigations Map 3236
The Topock quadrangle exposes a structurally complex part of the Colorado River extensional corridor and also exposes deposits that record landscape evolution during the history of the Colorado River. Paleoproterozoic gneisses and Mesoproterozoic granitoids and intrusive sheets are exposed through tilted cross-sectional thicknesses of many kilometers. Intruding them are a...
Phylogeography, post-glacial gene flow, and population history of North American goshawks (Accipeter gentilis)
Shelley Bayard De Volo, Richard T. Reynolds, Sarah A. Sonsthagen, Sandra L. Talbot, Michael F. Antolin
2013, The Auk (130) 342-354
Climate cycling during the Quaternary played a critical role in the diversification of avian lineages in North America, greatly influencing the genetic characteristics of contemporary populations. To test the hypothesis that North American Northern Goshawks (Accipitergentilis) were historically isolated within multiple Late Pleistocene refugia, we assessed diversity and population genetic...
Very long period conduit oscillations induced by rockfalls at Kilauea Volcano, Hawaii
Bernard A. Chouet, Phillip B. Dawson
2013, Journal of Geophysical Research B: Solid Earth (118) 5352-5371
Eruptive activity at the summit of Kilauea Volcano, Hawaii, beginning in 2010 and continuing to the present time is characterized by transient outgassing bursts accompanied by very long period (VLP) seismic signals triggered by rockfalls from the vent walls impacting a lava lake in a pit within the Halemaumau pit...
Management guidelines for enhancing Cerulean Warbler breeding habitat in Appalachian hardwood forests
Petra Wood, James Sheehan, Patrick D. Keyser, David A. Buehler, Jeff Larkin, Amanda D. Rodewald, Scott H. Stoleson, T. Bently Wigley, Jeremy Mizel, Than J. Boves, Greg George, Marja H. Bakermans, Tiffany A. Beachy, Andrea Evans, Molly E. McDermott, Felicity L. Newell, Kelly A. Perkins, Matt White
2013, Report
The Cerulean Warbler (Setophaga cerulea) is a migratory songbird that breeds in mature deciduous forests of eastern North America. Cerulean Warblers (hereafter, ceruleans) require heavily forested landscapes for nesting and, within Appalachian forests, primarily occur on ridge tops and steep, upper slopes. They are generally associated with oakdominated (Quercus spp.)...
Global climate change impacts on coastal ecosystems in the Gulf of Mexico: Considerations for integrated coastal management
John W. Day, Alejandro Yanez-Arancibia, James H. Cowan, Richard H. Day, Robert R. Twilley, John R. Rybczyk
2013, Book chapter, Gulf of Mexico origin, waters, and biota
Global climate change is important in considerations of integrated coastal management in the Gulf of Mexico. This is true for a number of reasons. Climate in the Gulf spans the range from tropical to the lower part of the temperate zone. Thus, as climate warms, the tropical temperate interface, which...
Spring migratory pathways and migration chronology of Canada geese (Branta canadensis interior) wintering at the Santee National Wildlife Refuge, South Carolina
Molly M. Giles, Patrick G.R. Jodice, Robert F. Baldwin, John D. Stanton, Marc Epstein
2013, Canadian Field-Naturalist (127) 17-25
We assessed the migratory pathways, migration chronology, and breeding ground affiliation of Canada Geese (Branta canadensis interior) that winter in and adjacent to the Santee National Wildlife Refuge in Summerton, South Carolina, United States. Satellite transmitters were fitted to eight Canada Geese at Santee National Wildlife Refuge during the winter...
Assessing winter cover crop nutrient uptake efficiency using a water quality simulation model
In-Young Yeo, Sangchui Lee, Ali M. Sadeghi, Peter C. Beeson, W. Dean Hively, Greg W. McCarty, Megan W. Lang
2013, Hydrology and Earth System Sciences (10) 14229-14263
Winter cover crops are an effective conservation management practice with potential to improve water quality. Throughout the Chesapeake Bay Watershed (CBW), which is located in the Mid-Atlantic US, winter cover crop use has been emphasized and federal and state cost-share programs are available to farmers to subsidize the cost of...
Woodland dynamics at the northern range periphery: A challenge for protected area management in a changing world
Scott L. Powell, Andrew J. Hansen, Thomas J. Rodhouse, Lisa K. Garrett, Julio L. Betancourt, Gordon H. Dicus, Meghan K. Lonneker
2013, PLoS ONE (8)
Managers of protected natural areas increasingly are confronted with novel ecological conditions and conflicting objectives to preserve the past while fostering resilience for an uncertain future. This dilemma may be pronounced at range peripheries where rates of change are accelerated and ongoing invasions often are perceived as threats to local...
Galveston Bay: Chapter D in Emergent wetlands status and trends in the northern Gulf of Mexico: 1950-2010
Lawrence R. Handley, Kathryn A. Spear, Eleonor Taylor, Cindy A. Thatcher
2013, Report, Emergent wetlands status and trends in the northern Gulf of Mexico: 1950-2010
The Galveston Bay estuary is located on the upper Texas Gulf coast (Lester and Gonzalez, 2002). It is composed of four major sub-bays - Galveston, Trinity, East, and West Bays. It is Texas’ largest estuary on the Gulf Coast with a total area of 155,399 hectares (384,000 acres) and 1,885...
The false spring of 2012, earliest in North American record
T.R. Ault, G.M. Henebry, K. M. de Beurs, M.D. Schwartz, Julio L. Betancourt, David Moore
2013, Eos, Transactions, American Geophysical Union (94) 181-183
Phenology - the study of recurring plant and animal life cycle stages, especially their timing and relationships with weather and climate - is becoming an essential tool for documenting, communicating, and anticipating the consequences of climate variability and change. For example, March 2012 broke numerous records for warm temperatures and...
Statewide summary for Alabama
Lawrence R. Handley, Kathryn A. Spear, Stephen Jones, Cindy A. Thatcher
2013, Report, Emergent wetlands status and trends in the northern Gulf of Mexico: 1950-2010
Alabama is over 132,000 km2 (51,000 miles2) in area, 483 km (300 miles) long, and 322 km (200 miles) wide (Copeland, 1968). Coastal Alabama comprises Mobile and Baldwin Counties and the surrounding State waters in the Gulf of Mexico (Figure 1; O’Neil and Mettee, 1982). It is part of both...
Mobile Bay
Lawrence R. Handley, Kathryn A. Spear, Stephen Jones, Cindy A. Thatcher
2013, Report, Emergent wetlands status and trends in the northern Gulf of Mexico: 1950-2010
Mobile Bay is the largest bay found in Alabama’s coastal area (Handley et al., 2007). It was named an Estuary of National Significance in 1995 under the U.S. Environmental Protection Agency’s (EPA) National Estuary Program (NEP), and its Comprehensive Conservation Management Plan was completed in 2002. Mobile Bay is 1,070...
Photogrammetric monitoring of lava dome growth during the 2009 eruption of Redoubt Volcano
Angela K. Diefenbach, Katharine F. Bull, Rick Wessels, Robert G. McGimsey
2013, Journal of Volcanology and Geothermal Research (259) 308-316
The 2009 eruption of Redoubt Volcano, Alaska, began with a phreatic explosion on 15 March followed by a series of at least 19 explosive events and growth and destruction of at least two, and likely three, lava domes between 22 March and 4 April. On 4 April explosive activity...
Paleogeographic insights based on new U-Pb dates for altered tuffs in the Miocene Barstow Formation, California
David M. Miller, Jose E. Rosario, Shannon R. Leslie, Jorge A. Vazquez
2013, Conference Paper, Raising Questions in the Central Mojave Desert
The type section of the Barstow Formation in the Mud Hills, north of Barstow, is a reference section for early to middle Miocene paleontology, magnetostratigraphy, and dated volcanic episodes. Thanks to this robust chronologic framework, much of the interpretation of the paleogeography of the region from about 18 Ma to...
Laramide basin CSI: Comprehensive stratigraphic investigations of Paleogene sediments in the Colorado Headwaters Basin, north-central Colorado
Marieke Dechesne, James C. Cole, James H. Trexler, Patricia Cashman, Christopher D Peterson
2013, Book chapter, Classic concepts and new directions: Exploring 125 years of GSA discoveries in the Rocky Mountain Region
The Paleogene sedimentary deposits of the Colorado Headwaters Basin provide a detailed proxy record of regional deformation and basin subsidence during the Laramide orogeny in north-central Colorado and southern Wyoming. This field trip presents extensive evidence from sedimentology, stratigraphy, structure, palynology, and isotope geochronology that shows a complex history that...
The Cambrian-Ordovician rocks of Sonora, Mexico, and southern Arizona, southwestern margin of North America (Laurentia)
William R. Page, Alta C. Harris, John E. Repetski
James R. Derby, R.D. Fritz, S.A. Longacre, W.A. Morgan, C.A. Sternbach, editor(s)
2013, Book chapter, The great American carbonate bank: The geology and economic resources of the Cambrian-Ordovician Sauk megasequence of Laurentia
Cambrian and Ordovician shelf, platform, and basin rocks are present in Sonora, Mexico, and southern Arizona and were deposited on the southwestern continental margin of North America (Laurentia). Cambrian and Ordovician rocks in Sonora, Mexico, are mostly exposed in scattered outcrops in the northern half of the state. Their discontinuous nature results...
100,000-year-long terrestrial record of millennial-scale linkage between eastern North American mid-latitude paleovegetation shifts and Greenland ice-core oxygen isotope trends
Ronald J. Litwin, Joseph P. Smoot, Milan J. Pavich, Helaine W. Markewich, George Brook, Nancy J. Durika
2013, Quaternary Research (80) 291-315
We document frequent, rapid, strong, millennial-scale paleovegetation shifts throughout the late Pleistocene, within a 100,000+ yr interval (~ 115–15 ka) of terrestrial sediments from the mid-Atlantic Region (MAR) of North America. High-resolution analyses of fossil pollen from one core locality revealed a continuously shifting sequence of thermally dependent forest assemblages,...
Toxicity of sediments potentially contaminated by coal mining and natural gas extraction to unionid mussels and commonly tested benthic invertebrates
Ning Wang, Christopher G. Ingersoll, James L. Kunz, William G. Brumbaugh, Cindy M. Kane, R. Brian Evans, Steven Alexander, Craig Walker, Steve Bakaletz
2013, Environmental Toxicology and Chemistry (32) 207-221
Sediment toxicity tests were conducted to assess potential effects of contaminants associated with coal mining or natural gas extraction activities in the upper Tennessee River basin and eastern Cumberland River basin in the United States. Test species included two unionid mussels (rainbow mussel, Villosa iris, and wavy-rayed lampmussel, Lampsilis fasciola,...
Projected surface radiative forcing due to 2000--2050 land-cover land-use albedo change over the eastern United States
Christopher A. Barnes, David P. Roy, Thomas R. Loveland
2013, Journal of Land Change Science (8) 369-382
Satellite-derived contemporary land-cover land-use (LCLU) and albedo data and modeled future LCLU are used to study the impact of LCLU change from 2000 to 2050 on surface albedo and radiative forcing for 19 ecoregions in the eastern United States. The modeled 2000–2050 LCLU changes indicate a future decrease in both...
Global change effects on Bromus tectorum L. (Poaceae) at its high-elevation range margin
Amy L. Concilio, Michael E. Loik, Jayne Belnap
2013, Global Change Biology (19) 161-172
Global change is likely to affect invasive species distribution, especially at range margins. In the eastern Sierra Nevada, California, USA, the invasive annual grass, Bromus tectorum, is patchily distributed and its impacts have been minimal compared with other areas of the Intermountain West. We used a series of in situ...
Regional geophysical expression of a carbonatite terrane in the eastern Mojave Desert, California
David A. Ponce, Kevin M. Denton, David M. Miller
2013, Book
A world-class, rare earth element carbonatite deposit is located near Mountain Pass, in the eastern Mojave Desert of California and is hosted by Proterozoic rocks that extend along the eastern margins of the Clark Mountain Range, Mescal Range, and Ivanpah Mountains in a north-northwest trending fault-bounded block. This Proterozoic block...
Using simulated maps to interpret the geochemistry, formation and quality of the Blue Gem Coal Bed, Kentucky, USA
Nicholas J. Geboy, Ricardo A. Olea, Mark A. Engle, Jose Antonio Martin-Fernandez
2013, International Journal of Coal Geology (112)
This study presents geostatistical simulations of coal-quality parameters, major oxides and trace metals for an area covering roughly 812 km2 of the Blue Gem coal bed in southeastern Kentucky, USA. The Blue Gem, characterized by low ash yield and low sulfur content, is an important economic resource. Past studies have...
A culture-based survey of fungi in soil from bat hibernacula in the eastern United States and its implications for detection of Geomyces destructans, the causal agent of bat white-nose syndrome
Jeffrey M. Lorch, Daniel L. Lindner, Andrea Gargas, Laura K. Muller, Andrew M. Minnis, David S. Blehert
2013, Mycologia (105) 237-252
The recent emergence of white-nose syndrome (WNS), a fungal disease causing unprecedented mortality among hibernating bats of eastern North America, has revealed a knowledge gap regarding fungal communities associated with bats and their hibernacula. We used culture-based techniques to investigate the diversity of fungi in soil samples collected from 24...
Relations between altered stramflow variability and fish assemblages in Eastern USA streams
Michael R. Meador, Daren M. Carlisle
2012, River Research and Applications (28) 1359-1368
Although altered streamflow has been implicated as a major factor affecting fish assemblages, understanding the extent of streamflow alteration has required quantifying attributes of the natural flow regime. We used predictive models to quantify deviation from expected natural streamflow variability for streams in the eastern USA. Sites with >25% change...
Assessment of salinity intrusion in the James and Chickahominy Rivers as a result of simulated sea-level rise in Chesapeake Bay, East Coast, USA
Karen C. Rice, Bo Hong, Jian Shen
2012, Journal of Environmental Management (111) 61-69
Global sea level is rising, and the relative rate in the Chesapeake Bay region of the East Coast of the United States is greater than the worldwide rate. Sea-level rise can cause saline water to migrate upstream in estuaries and rivers, threatening freshwater habitat and drinking-water supplies. The effects of...
