Pinedale glacial history of the upper Arkansas River valley: New moraine chronologies, modeling results, and geologic mapping
Avriel D. Schweinsberg, Jason P. Briner, Ralph R. Shroba, Joseph M. Licciardi, Eric M. Leonard, Keith A. Brugger, Charles M. Russell
2016, Book chapter, Unfolding the Geology of the West
This field-trip guide outlines the glacial history of the upper Arkansas River valley, Colorado, and builds on a previous GSA field trip to the area in 2010. The following will be presented: (1) new cosmogenic 10Be exposure ages of moraine boulders from the Pinedale and Bull Lake glaciations (Marine Isotope...
Does the stress-gradient hypothesis hold water? Disentangling spatial and temporal variation in plant effects on soil moisture in dryland systems
Bradley J. Butterfield, John B. Bradford, Cristina Armas, Ivan Prieto, Francisco I. Pugnaire
2016, Functional Ecology (30) 10-19
The nature of the relationship between water limitation and facilitation has been one of the most contentious debates surrounding the stress-gradient hypothesis (SGH), which states that plant-plant interactions shift from competition to facilitation with increasing environmental stress. We take a closer look at the potential role of soil...
Improved geomagnetic referencing in the Arctic environment
B. Poedjono, N. Beck, A. C. Buchanan, L. Borri, S. Maus, Carol Finn, E. William Worthington, Tim White
2016, Conference Paper
Geomagnetic referencing uses the Earth’s magnetic field to determine accurate wellbore positioning essential for success in today's complex drilling programs, either as an alternative or a complement to north-seeking gyroscopic referencing. However, fluctuations in the geomagnetic field, especially at high latitudes, make the application of geomagnetic referencing in those areas...
Conflation and integration of archived geologic maps and associated uncertainties
Thomas G. Shoberg
2016, Journal of Geography and Geology (8) 28-40
Old, archived geologic maps are often available with little or no associated metadata. This creates special problems in terms of extracting their data to use with a modern database. This research focuses on some problems and uncertainties associated with conflating older geologic maps in regions where modern geologic maps are,...
Diet overlap and predation between largemouth bass and walleye in Wisconsin lakes using DNA barcoding to improve taxonomic resolution
Craig J. Kelling, Daniel A. Isermann, Brian L. Sloss, Keith N. Turnquist
2016, North American Journal of Fisheries Management (36) 621-629
Over the last decade, the abundance of Largemouth Bass Micropterus salmoides has increased in many northern Wisconsin lakes, causing concern among anglers and biologists regarding the potential for Largemouth Bass to negatively affect populations of Walleye Sander vitreus through predation or competition for prey. Our objectives were to determine whether...
2015-2016 Palila abundance estimates
Richard J. Camp, Kevin W. Brinck, Paul C. Banko
2016, Technical Report HCSU-TR076
The palila (Loxioides bailleui) population was surveyed annually during 1998−2016 on Mauna Kea Volcano to determine abundance, population trend, and spatial distribution. In the latest surveys, the 2015 population was estimated at 852−1,406 birds (point estimate: 1,116) and the 2016 population was estimated at 1,494−2,385 (point estimate: 1,934). Similar numbers...
Evidence for range contraction of snowshoe hare in Pennsylvania
Duane R. Diefenbach, Stephen L. Rathbun, J.K. Vreeland, Deborah Grove, William J. Kanapaux
2016, Northeastern Naturalist (23) 229-248
In Pennsylvania, Lepus americanus (Snowshoe Hare) is near the southern limits of its range and at risk of range contraction because of loss of early-successional forest and impacts of climate change. We used hunter-harvest data to investigate changes in the distribution of Snowshoe Hare in Pennsylvania (1983–2011), forest inventory and...
Geology and geomorphology of the Carolina Sandhills, Chesterfield County, South Carolina
Christopher S. Swezey, Bradley A. Fitzwater, G. Richard Whittecar
2016, Book
This two-day field trip focuses on the geology and geomorphology of the Carolina Sandhills in Chesterfield County, South Carolina. This area is located in the updip portion of the U.S. Atlantic Coastal Plain province, supports an ecosystem of longleaf pine (Pinus palustris) and wiregrass (Aristida stricta), and contains three major...
Age, growth and fall diet of channel catfish in Cheat Lake, West Virginia
Corbin D. Hilling, Stuart A. Welsh, Dustin M. Smith
2016, Journal of Fish and Wildlife Management (7) 304-314
Acidification has historically impaired Cheat Lake's fish community, but recent mitigation efforts within the Cheat River watershed have improved water quality and species richness. Presently, channel catfish Ictalurus punctatus are abundant and attain desirable sizes for anglers. We evaluated the age, growth, and fall diet of the population. We collected...
Volcanogenic massive sulphide and orogenic gold deposits of northern southeast Alaska
Patrick J Sack, Susan M. Karl, Nathan Steeves, J Bruce Gemmell
2016, Book
This five-day field trip visits the most significant mineral deposits in northern southeast Alaska. The trip begins and ends with regional transects in the interior Intermontane terranes around Whitehorse, Yukon, and the Insular terranes along the northern Chatham Strait region of southeast Alaska (Fig. A-1 and Fig. A-2; Plate-1). To...
Seasonal electrical resistivity surveys of a coastal bluff, Barter Island, North Slope Alaska
Peter W. Swarzenski, Cordell Johnson, Thomas Lorenson, Christopher H. Conaway, Ann E. Gibbs, Li H. Erikson, Bruce M. Richmond, Mark P. Waldrop
2016, Journal of Environmental & Engineering Geophysics (21) 37-42
Select coastal regions of the North Slope of Alaska are experiencing high erosion rates that can be attributed in part to recent warming trends and associated increased storm intensity and frequency. The upper sediment column of the coastal North Slope of Alaska can be described as continuous permafrost underlying a...
Primary production in the Sacramento-San Joaquin Delta: A science strategy to quantify change and identify future potential
April Robinson, Amy Richey, James E. Cloern, Katharyn E. Boyer, Jon Burau, Elizabeth A. Canuel, John F. DeGeorge, Judith Z. Drexler, E. R. Howe, Ronald Kneib, Anke Mueller-Solger, James L. Pinckney, Robert J. Naiman, David H. Schoellhamer, Charles A. Simenstad
2016, Report
No abstract available....
Estuaries: Life on the edge: Chapter 19
James E. Cloern, Patrick L. Barnard, Erin Beller, John C. Callaway, Letitia Grenier, Edwin D. Grosholz, Robin Grossinger, Kathryn Hieb, James T. Holligaugh, Noah Knowles, Martha Sutula, Samuel Veloz, Kerstin Wasson, Alison Whipple
2016, Book chapter, Ecosystems of California
No abstract available....
Science framework for the conservation and restoration strategy of DOI secretarial order 3336: Utilizing resilience and resistance concepts to assess threats to sagebrush ecosystems and greater sage-grouse, prioritize conservation and restoration actions, and inform management strategies
Jeanne C. Chambers, Steve Campbell, John Carlson, Jeffrey L. Beck, Karen J. Clause, Jonathan B. Dinkins, Kevin E. Doherty, Shawn Espinosa, Kathleen A. Griffin, Thomas J. Christiansen, Michele R. Crist, Steve E. Hanser, Douglas W. Havlina, Kenneth F. Henke, Jacob D. Hennig, Laurie L. Kurth, Jeremy D. Maestas, Kenneth E. Mayer, Mary E. Manning, Brian A. Mealor, Clinton McCarthy, Mike Pellant, Karen L. Prentice, Marco A. Perea, Lief A. Wiechman, David A. Pyke, Amarina Wuenschel
2016, Report
The Science Framework for the Conservation and Restoration Strategy of the Department of the Interior, Secretarial Order 3336 (SO 3336), Rangeland Fire Prevention, Management and Restoration, provides a strategic, multiscale approach for prioritizing areas for management and determining effective management strategies across the sagebrush biome. The emphasis of this version...
Non-linear responses of glaciated prairie wetlands to climate warming
W. Carter Johnson, Brett Werner, Glenn R. Guntenspergen
2016, Climatic Change (134) 209-223
The response of ecosystems to climate warming is likely to include threshold events when small changes in key environmental drivers produce large changes in an ecosystem. Wetlands of the Prairie Pothole Region (PPR) are especially sensitive to climate variability, yet the possibility that functional changes may occur more rapidly with...
The international scale of the groundwater issue
Michael Fienen, Muhammad Arshad
2016, Book chapter, Integrated groundwater management
Throughout history, and throughout the world, groundwater has been a major source of water for sustaining human life. Use of this resource has increased dramatically over the last century. In many areas of the world, the balance between human and ecosystem needs is difficult to maintain. Understanding the international scale...
The development of small, cabled, real-time video based observation systems for near shore coastal marine science including three examples and lessons learned
Gerry Hatcher, Craig Okuda
2016, Conference Paper, Oceans 16 MTS/IEEE Conference Proceedings
The effects of climate change on the near shore coastal environment including ocean acidification, accelerated erosion, destruction of coral reefs, and damage to marine habitat have highlighted the need for improved equipment to study, monitor, and evaluate these changes [1]. This is especially true where areas of study are remote,...
Dispersal and spatial heterogeneity: Single species
Donald L. DeAngelis, Wei-Ming Ni, Bo Zhang
2016, Journal of Mathematical Biology (72) 239-254
A recent result for a reaction-diffusion equation is that a population diffusing at any rate in an environment in which resources vary spatially will reach a higher total equilibrium biomass than the population in an environment in which the same total resources are distributed homogeneously. This has so far been...
Loamy, two-storied soils on the outwash plains of southwestern lower Michigan: Pedoturbation of loess with the underlying sand
Michael D. Luehmann, Brad G. Peter, Christopher B. Connallon, Randall J. Schaetzl, Samuel J. Smidt, Wei Liu, Kevin A. Kincare, Toni A. Walkowiak, Elin Thorlund, Marie S. Holler
2016, Annals of the American Association of Geographers (106) 551-572
Soils on many of the outwash plains in southwestern Michigan have loamy upper profiles, despite being underlain by sand-textured outwash. The origin of this upper, loamy material has long been unknown. The purpose of this study is to analyze the spatio-textural characteristics of these loamy-textured sediments to ascertain their origin(s)....
Biological and communication skills needed for introduced fish biologists
Scott A. Bonar
2016, Fisheries (41) 466-467
What skills and knowledge will a new graduate seeking employment need to work with introduced fishes? Clearly, success in introduced species management—similar to other disciplines in fisheries—requires a mixture of scientific and communication skills. However, specific abilities especially important to a biologist who manages introduced fishes should be highlighted. Unlike...
Deathcore, creativity, and scientific thinking
David G. Angeler, Shana M. Sundstrom, Craig R. Allen
2016, Research Ideas and Outcomes (2) 1-6
BackgroundMajor scientific breakthroughs are generally the result of materializing creative ideas, the result of an inductive process that sometimes spontaneously and unexpectedly generates a link between thoughts and/or objects that did not exist before. Creativity is the cornerstone of scientific thinking, but scientists in academia are...
Ecology and conservation of Lesser Prairie-Chickens
David A. Haukos, Clint W. Boal, editor(s)
2016, Book
Lesser Prairie-Chickens have experienced substantial declines in terms of population and the extent of area that they occupy. While they are an elusive species, making it difficult at times to monitor them, current evidence indicates that they have been persistently decreasing in number since the Dust Bowl of the 1930s...
State-and-transition models: Conceptual versus simulation perspectives, usefulness and breadth of use, and land management applications
Louis Provencher, Leonardo Frid, Christina Czembor, Jeffrey T. Morisette
2016, Book chapter, Exotic brome-grasses in arid and semiarid ecosystems of the western US
State-and-Transition Simulation Modeling (STSM) is a quantitative analysis method that can consolidate a wide array of resource management issues under a “what-if” scenario exercise. STSM can be seen as an ensemble of models, such as climate models, ecological models, and economic models that incorporate human dimensions and management options. This...
Estimating black bear density in New Mexico using noninvasive genetic sampling coupled with spatially explicit capture-recapture methods
Matthew J. Gould, James W. Cain III, Gary W. Roemer, William R. Gould
2016, Cooperator Science Series FWS/CSS-120-2016
During the 2004–2005 to 2015–2016 hunting seasons, the New Mexico Department of Game and Fish (NMDGF) estimated black bear abundance (Ursus americanus) across the state by coupling density estimates with the distribution of primary habitat generated by Costello et al. (2001). These estimates have been used to set harvest limits....
San Pedro River Aquifer Binational Report
James B. Callegary, Ismael Minjarez Sosa, Elia Maria Tapia Villasenor, Placido dos Santos, Rogelio Monreal Saavedra, Franciso Javier Grijalva Noriega, A. K. Huth, Floyd Gray, C. A. Scott, Sharon Megdal, L. A. Oroz Ramos, Miguel Rangel Medina, James M. Leenhouts
2016, Report
The United States and Mexico share waters in a number of hydrological basins and aquifers that cross the international boundary. Both countries recognize that, in a region of scarce water resources and expanding populations, a greater scientific understanding of these aquifer systems would be beneficial. In light of this, the...
