Geographic setting influences Great Lakes beach microbiological water quality
Sheridan K. Haack, Lisa R. Fogarty, Erin A. Stelzer, Lori M. Fuller, Angela K. Brennan, Natasha M. Isaacs, Heather E. Johnson
2013, Environmental Science & Technology (47) 12054-12063
Understanding of factors that influence Escherichia coli (EC) and enterococci (ENT) concentrations, pathogen occurrence, and microbial sources at Great Lakes beaches comes largely from individual beach studies. Using 12 representative beaches, we tested enrichment cultures from 273 beach water and 22 tributary samples for EC, ENT, and genes indicating the...
How old is the Isthmus of Panama?
Anthony G Coates, Robert F. Stallard
2013, Bulletin of Marine Science (89) 801-813
The Standard Model of the formation of the Isthmus of Panama proposes that final closure occurred at 4–3 Ma. The model is based on evidence from studies of marine stratigraphy, fossil sequences, divergent molecular phylogenies, the timing of the Great American Biological Interchange (GABI), and proxies for marine paleosalinity, paleobathymetry,...
Variability and trends in irrigated and non-irrigated croplands in the central U.S
Jesslyn F. Brown, Md Shahriar Pervez
2013, Conference Paper, Information for sustainable agriculture, International Conference on Agro-Geoinformatics, 2nd, Fairfax, Va., 12–16 August 2013, Proceedings
Over 23 million hectares (233 thousand km2) of U.S. croplands are irrigated and there was an overall net expansion of 522 thousand hectares nationally from 2002 to 2007. Most of this expansion occurred across the High Plains Aquifer (HPA) in the central Great Plains. Until recently, there has been a...
The Hyper-Envelope Modeling Interface (HEMI): A Novel Approach Illustrated Through Predicting Tamarisk (Tamarix spp.) Habitat in the Western USA
Jim Graham, Nick Young, Catherine S. Jarnevich, Greg Newman, Paul Evangelista, Thomas J. Stohlgren
2013, Environmental Management (52) 929-938
Habitat suitability maps are commonly created by modeling a species’ environmental niche from occurrences and environmental characteristics. Here, we introduce the hyper-envelope modeling interface (HEMI), providing a new method for creating habitat suitability models using Bezier surfaces to model a species niche in environmental space. HEMI allows modeled surfaces to...
Statistical mapping of zones of focused groundwater/surface-water exchange using fiber-optic distributed temperature sensing
Kisa Mwakanyamale, Frederick D. Day-Lewis, Lee D. Slater
2013, Water Resources Research (49) 6979-6984
Fiber-optic distributed temperature sensing (FO-DTS) increasingly is used to map zones of focused groundwater/surface-water exchange (GWSWE). Previous studies of GWSWE using FO-DTS involved identification of zones of focused GWSWE based on arbitrary cutoffs of FO-DTS time-series statistics (e.g., variance, cross-correlation between temperature and stage, or spectral power). New approaches are...
Distribution of extant populations of Quadrula mitchelli (false spike)
Charles R. Randklev, Eric Tsakiris, Robert G. Howells, Julie Groce, Matthew S. Johnson, Joseph Bergmann, Clint Robertson, Andy Blair, Brad Littrell, Nathan Johnson
2013, Ellipsaria (15) 18-21
The False Spike, Quadrula mitchelli (Simpson 1896), is a rare species of mussel endemic to Central Texas and the Rio Grande drainage (Howells 2010). This species was thought to have been extinct until the discovery of several live individuals in the Guadalupe River and a fresh dead individual in the...
Lake shoreline in the contiguous United States: Quantity, distribution and sensitivity to observation resolution
Luke A. Winslow, Jordan S. Read, Paul C. Hanson, Emily H. Stanley
2013, Freshwater Biology
1. Quantifying lake biogeochemical processing at broad spatial scales requires that we scale processes along with physical metrics. Past work has primarily scaled lentic processes using estimates of lake surface area. However, many processes important to lakes, such as material, energy and biological fluxes and biogeochemical cycling, scale with lake...
The state of human dimensions capacity for natural resource management: needs, knowledge, and resources
Natalie R. Sexton, Kirsten M. Leong, Brad J. Milley, Melinda M. Clarke, Tara L. Teel, Mark A. Chase, Alia M. Dietsch
2013, The George Wright Forum (30) 142-153
The social sciences have become increasingly important in understanding natural resource management contexts and audiences, and are essential in design and delivery of effective and durable management strategies. Yet many agencies and organizations do not have the necessary resource management. We draw on the textbook definition of HD: how and...
Recent changes in successional state of the deep-water fish communities of Lakes Michigan, Huron, and Ontario and management implications
Randy L. Eshenroder, Brian F. Lantry
William W. Taylor, Abigail Lynch, Nancy J. Leonard, editor(s)
2013, Book chapter, Great Lakes fisheries policy and management: A binational perspective
No abstract available....
It's time for bold new approaches to link delta science and policymaking
James E. Cloern, Ellen Hanak
2013, San Francisco Estuary and Watershed Science (11)
California’s Sacramento–San Joaquin Delta is widely recognized as a highly damaged ecosystem. The Delta is also emblematic of a growing sense worldwide that society needs to do a better job of using scientific knowledge to guide conservation and resource management policies. Fortunately, we now have an unprecedented opportunity to get it right in building...
Seasonal circulation over the Catalan inner-shelf (northwest Mediterranean Sea)
Manel Grifoll, Alfredo L. Aretxabaleta, Josep L. Pelegri, Manuel Espino, John C. Warner, Agustin Sanchez-Arcilla
2013, Journal of Geophysical Research C: Oceans (118) 5844-5857
This study characterizes the seasonal cycle of the Catalan inner-shelf circulation using observations and complementary numerical results. The relation between seasonal circulation and forcing mechanisms is explored through the depth-averaged momentum balance, for the period between May 2010 and April 2011, when velocity observations were partially available. The monthly-mean along-shelf...
Alternative ways of using field-based estimates to calibrate ecosystem models and their implications for carbon cycle studies
Yujie He, Qianlai Zhuang, David McGuire, Yaling Liu, Min Chen
2013, Journal of Geophysical Research: Biogeosciences (118) 983-993
Model-data fusion is a process in which field observations are used to constrain model parameters. How observations are used to constrain parameters has a direct impact on the carbon cycle dynamics simulated by ecosystem models. In this study, we present an evaluation of several options for the use of observations...
Parasites as prey in aquatic food webs: implications for predator infection and parasite transmission
David W. Thieltges, Per-Arne Amundsen, Ryan F. Hechinger, Pieter T.J. Johnson, Levin D. Lafferty, Kim N. Mouritsen, Daniel L. Preston, Karsten Reise, C. Dieter Zander, Robert Poulin
2013, Oikos (122) 1473-1482
While the recent inclusion of parasites into food-web studies has highlighted the role of parasites as consumers, there is accumulating evidence that parasites can also serve as prey for predators. Here we investigated empirical patterns of predation on parasites and their relationships with parasite transmission in eight topological food webs...
Vs30 and spectral response from collocated shallow, active- and passive-source Vs data at 27 sites in Puerto Rico
Jack K. Odum, William J. Stephenson, Robert A. Williams, Christa von Hillebrandt-Andrade
2013, Bulletin of the Seismological Society of America (103) 2709-2728
Shear‐wave velocity (VS) and time‐averaged shear‐wave velocity to 30 m depth (VS30) are the key parameters used in seismic site response modeling and earthquake engineering design. Where VS data are limited, available data are often used to develop and refine map‐based proxy models of VS30 for predicting ground‐motion intensities. In...
Temporal, spatial, and body size effects on growth rates of loggerhead sea turtles (Caretta caretta) in the Northwest Atlantic
Karen A. Bjorndal, Barbara A. Schroeder, Allen M. Foley, Blair E. Witherington, Michael Bresette, David Clark, Richard M. Herren, Michael D. Arendt, Jeffrey R. Schmid, Anne B. Meylan, Peter A. Meylan, Jane A. Provancha, Kristen M. Hart, Margaret M. Lamont, Raymond R. Carthy, Alan B. Bolten
2013, Marine Biology (160) 2711-2721
In response to a call from the US National Research Council for research programs to combine their data to improve sea turtle population assessments, we analyzed somatic growth data for Northwest Atlantic (NWA) loggerhead sea turtles (Caretta caretta) from 10 research programs. We assessed growth dynamics over wide ranges of...
Seasonal persistence of marine-derived nutrients in south-central Alaskan salmon streams
Daniel J. Rinella, Mark S. Wipfi, Coowe M. Walker, Craig A. Stricker, Ron A. Heintz
2013, Ecosphere (4)
Spawning salmon deliver annual pulses of marine-derived nutrients (MDN) to riverine ecosystems around the Pacific Rim, leading to increased growth and condition in aquatic and riparian biota. The influence of pulsed resources may last for extended periods of time when recipient food webs have effective storage mechanisms, yet few studies...
Analysis of Neogene deformation between Beaver, Utah and Barstow, California: Suggestions for altering the extensional paradigm
R. Ernest Anderson, Sue Beard, Edward A. Mankinen, John W. Hillhouse
2013, Geological Society of America Special Papers (499) 1-67
For more than two decades, the paradigm of large-magnitude (~250 km), northwest-directed (~N70°W) Neogene extensional lengthening between the Colorado Plateau and Sierra Nevada at the approximate latitude of Las Vegas has remained largely unchallenged, as has the notion that the strain integrates with coeval strains in adjacent regions and with...
Characterizing and estimating noise in InSAR and InSAR time series with MODIS
William D. Barnhart, Rowena B. Lohman
2013, Geochemistry, Geophysics, Geosystems (14) 4121-4132
InSAR time series analysis is increasingly used to image subcentimeter displacement rates of the ground surface. The precision of InSAR observations is often affected by several noise sources, including spatially correlated noise from the turbulent atmosphere. Under ideal scenarios, InSAR time series techniques can substantially mitigate these effects; however, in...
Integrating complexity into data-driven multi-hazard supply chain network strategies
Suzanna K. Long, Thomas G. Shoberg, Varun Ramachandran, Steven M. Corns, Hector J. Carlo
2013, Book, Proceedings of the ASPRS\CaGIS 2013 Specialty Conference
Major strategies in the wake of a large-scale disaster have focused on short-term emergency response solutions. Few consider medium-to-long-term restoration strategies that reconnect urban areas to the national supply chain networks (SCN) and their supporting infrastructure. To re-establish this connectivity, the relationships within the SCN must be defined and formulated...
Links between climate change, water-table depth, and water chemistry in a mineralized mountain watershed
Andrew H. Manning, Philip L. Verplanck, Jonathan S. Caine, Andrew S. Todd
2013, Applied Geochemistry (37) 64-78
Recent studies suggest that climate change is causing rising solute concentrations in mountain lakes and streams. These changes may be more pronounced in mineralized watersheds due to the sensitivity of sulfide weathering to changes in subsurface oxygen transport. Specific causal mechanisms linking climate change and accelerated weathering rates have been...
Usefulness of hemocytometer as a counting chamber in a computer assisted sperm analyzer (CASA)
A. Eljarah, J. Chandler, J.A. Jenkins, J. Chenevert, A. Alcanal
2013, Animal Reproduction (10) 708-711
Several methods are used to determine sperm cell concentration, such as the haemocytometer, spectrophotometer, electronic cell counter and computer-assisted semen analysers (CASA). The utility of CASA systems has been limited due to the lack of characterization of individual systems and the absence of standardization among laboratories. The aims of this...
The innate immune response may be important for surviving plague in wild Gunnison's prairie dogs
Joseph D. Busch, Roger Van Andel, Nathan E. Stone, Kacy R. Cobble, Roxanne Nottingham, Judy Lee, Michael VerSteeg, Jeff Corcoran, Jennifer Cordova, William E. Van Pelt, Megan M. Shuey, Jeffrey T. Foster, James M. Schupp, Stephen Beckstrom-Sternberg, James Beckstrom-Sternberg, Paul Keim, Susan Smith, Julia Rodriguez-Ramos, Judy L. Williamson, Tonie E. Rocke, David M. Wagner
2013, Journal of Wildlife Diseases (49) 920-931
Prairie dogs (Cynomys spp.) are highly susceptible to Yersinia pestis, with ≥99% mortality reported from multiple studies of plague epizootics. A colony of Gunnison's prairie dogs (Cynomys gunnisoni) in the Aubrey Valley (AV) of northern Arizona appears to have survived several regional epizootics of plague, whereas nearby colonies have been...
Multivariate analysis of ATR-FTIR spectra for assessment of oil shale organic geochemical properties
Kathryn E. Washburn, Justin E. Birdwell
2013, Organic Geochemistry (63) 1-7
In this study, attenuated total reflectance (ATR) Fourier transform infrared spectroscopy (FTIR) was coupled with partial least squares regression (PLSR) analysis to relate spectral data to parameters from total organic carbon (TOC) analysis and programmed pyrolysis to assess the feasibility of developing predictive models to estimate important organic geochemical parameters....
Retrospective analysis of bottlenose dolphin foraging: a legacy of anthropogenic ecosystem disturbance
Sam Rossman, Nélio B. Barros, Peggy H. Ostrom, Craig A. Stricker, Aleta A. Hohn, Hasand Gandhi, Randall S. Wells
2013, Marine Mammal Science (29) 705-718
We used stable isotope analysis to investigate the foraging ecology of coastal bottlenose dolphins (Tursiops truncatus) in relation to a series of anthropogenic disturbances. We first demonstrated that stable isotopes are a faithful indicator of habitat use by comparing muscle isotope values to behavioral foraging data from the same individuals....
A multilocus evaluation of ermine (Mustela erminea) across the Holarctic, testing hypotheses of Pleistocene diversification in response to climate change
Natalie G. Dawson, Andrew G. Hope, Sandra L. Talbot, Joseph A. Cook
2013, Journal of Biogeography (41) 464-475
Aim: We examined data for ermine (Mustela erminea) to test two sets of diversification hypotheses concerning the number and location of late Pleistocene refugia, the timing and mode of diversification, and the evolutionary influence of insularization. Location: Temperate and sub-Arctic Northern Hemisphere. Methods: We used up to two mitochondrial and four nuclear...
