Biodynamics of copper oxide nanoparticles and copper ions in an oligochaete: Part I: relative importance of water and sediment as exposure routes
Tina Ramskov, Amalie Thit, Marie Noele Croteau, Henriette Selck
2015, Aquatic Toxicology (164) 81-91
Copper oxide (CuO) nanoparticles (NPs) are widely used, and likely released into the aquatic environment. Both aqueous (i.e., dissolved Cu) and particulate Cu can be taken up by organisms. However, how exposure routes influence the bioavailability and subsequent toxicity of Cu remains largely unknown. Here, we assess the importance of...
Simulating long-term effectiveness and efficiency of management scenarios for an invasive grass
Catherine S. Jarnevich, Tracy R. Holcombe, Catherine Cullinane Thomas, Leonardo Frid, Aaryn D. Olsson
2015, AIMS Environmental Science (2) 427-447
Resource managers are often faced with trade-offs in allocating limited resources to manage plant invasions. These decisions must often be made with uncertainty about the location of infestations, their rate of spread and effectiveness of management actions. Landscape level simulation tools such as state-and-transition simulation models (STSMs) can be used...
Influence of channel morphology and flow regime on larval drift of pallid sturgeon in the Lower Missouri River
Susannah O. Erwin, Robert B. Jacobson
2015, River Research and Applications (31) 538-551
The transition from drifting free embryo to exogenously feeding larvae has been identified as a potential life-stage bottleneck for the endangered Missouri River pallid sturgeon. Previous studies have indicated that river regulation and fragmentation may contribute to the mortality of larval pallid sturgeon by reducing the extent of free-flowing river...
High-frequency, long-duration water sampling in acid mine drainage studies: a short review of current methods and recent advances in automated water samplers
Thomas Chapin
2015, Applied Geochemistry (59) 118-124
Hand-collected grab samples are the most common water sampling method but using grab sampling to monitor temporally variable aquatic processes such as diel metal cycling or episodic events is rarely feasible or cost-effective. Currently available automated samplers are a proven, widely used technology and typically collect up to 24 samples...
Nearshore dynamics of artificial sand and oil agglomerates
P. Soupy Dalyander, Nathaniel G. Plant, Joseph W. Long, Molly R. McLaughlin
2015, Marine Pollution Bulletin (96) 344-355
Weathered oil can mix with sediment to form heavier-than-water sand and oil agglomerates (SOAs) that can cause beach re-oiling for years after a spill. Few studies have focused on the physical dynamics of SOAs. In this study, artificial SOAs (aSOAs) were created and deployed in the nearshore, and shear stress-based...
Characteristics of storms driving wave-induced seafloor mobility on the U.S. East Coast continental shelf
P. Soupy Dalyander, Bradford Butman
2015, Continental Shelf Research (104) 1-14
This study investigates the relationship between spatial and temporal patterns of wave-driven sediment mobility events on the U.S. East Coast continental shelf and the characteristics of the storms responsible for them. Mobility events, defined as seafloor wave stress exceedance of the critical stress of 0.35 mm diameter sand (0.2160 Pa)...
Decadal re-evaluation of contaminant exposure and productivity of ospreys (Pandion haliaetus) nesting in Chesapeake Bay Regions of Concern
Rebecca S. Lazarus, Barnett A. Rattner, Peter C. McGowan, Robert C. Hale, Sandra L. Schultz, Natalie K. Karouna-Renier, Mary Ann Ottinger
2015, Environmental Pollution (205) 278-290
The last large-scale ecotoxicological study of ospreys (Pandion haliaetus) in Chesapeake Bay was conducted in 2000-2001 and focused on U.S. EPA-designated Regions of Concern (ROCs; Baltimore Harbor/Patapsco, Anacostia/middle Potomac, and Elizabeth Rivers). In 2011-2012, ROCs were re-evaluated to determine spatial and temporal trends in productivity and contaminants. Concentrations of p,p'-DDE...
Enhanced biological processes associated with alopecia in polar bears (Ursus maritimus)
Lizabeth Bowen, A. Keith Miles, Jeffrey L. Stott, Shannon C. Waters-Dynes, Todd C. Atwood
2015, Science of the Total Environment (529) 114-120
Populations of wildlife species worldwide experience incidents of mass morbidity and mortality. Primary or secondary drivers of these events may escape classical detection methods for identifying microbial insults, toxin exposure, or additional stressors. In 2012, 28% of polar bears sampled in a study in the southern Beaufort Sea region of...
Natural trophic variability in a large, oligotrophic, near-pristine lake
Talia Young, Olaf P. Jensen, Brian Weidel, Sudeep Chandra
2015, Journal of Great Lakes Research (41) 463-472
Conclusions drawn from stable isotope data can be limited by an incomplete understanding of natural isotopic variability over time and space. We quantified spatial and temporal variability in fish carbon and nitrogen stable isotopes in Lake Hövsgöl, Mongolia, a large, remote, oligotrophic lake with an unusually species-poor fish community. The...
Individual specialization in the foraging habits of female bottlenose dolphins living in a trophically diverse and habitat rich estuary
Sam Rossman, Peggy H. Ostrom, Megan Stolen, Nélio B. Barros, Hasand Gandhi, Craig A. Stricker, Randall S. Wells
2015, Oecologia (178) 415-425
We examine individual specialization in foraging habits (foraging habitat and trophic level) of female bottlenose dolphins (Tursiops truncatus) resident in Sarasota Bay, Florida, USA, by analyzing time series of stable isotope (δ15N and δ13C) values in sequential growth layer groups within teeth. The isotope data provide a chronology of...
Unintended consequences of management actions in salt pond restoration: cascading effects in trophic interactions
John Y. Takekawa, Joshua T. Ackerman, Arriana Brand, Tanya R. Graham, Collin A. Eagles-Smith, Mark P. Herzog, Brent R. Topping, Gregory Shellenbarger, James S. Kuwabara, Eric Mruz, Sara L. Piotter, Nicole D. Athearn
2015, PLoS ONE (10) 1-15
Salt evaporation ponds have played an important role as habitat for migratory waterbirds across the world, however, efforts to restore and manage these habitats to maximize their conservation value has proven to be challenging. For example, salinity reduction has been a goal for restoring and managing former salt evaporation ponds...
Evaluating unsupervised methods to size and classify suspended particles using digital in-line holography
Emlyn J. Davies, Daniel D. Buscombe, George W. Graham, W. Alex M. Nimmo-Smith
2015, Journal of Atmospheric and Oceanic Technology (32) 1241-1256
Substantial information can be gained from digital in-line holography of marine particles, eliminating depth-of-field and focusing errors associated with standard lens-based imaging methods. However, for the technique to reach its full potential in oceanographic research, fully unsupervised (automated) methods are required for focusing, segmentation, sizing and classification of particles. These...
Computational fluid dynamics-habitat suitability index (CFD-HSI) modelling as an exploratory tool for assessing passability of riverine migratory challenge zones for fish
Alexander J. Haro, Michael Chelminski, Robert W. Dudley
2015, River Research and Applications (31) 526-537
We developed two-dimensional computational fluid hydraulics-habitat suitability index (CFD-HSI) models to identify and qualitatively assess potential zones of shallow water depth and high water velocity that may present passage challenges for five major anadromous fish species in a 2.63-km reach of the main stem Penobscot River, Maine, as a result...
Stable isotopes suggest low site fidelity in Bar-Headed Geese (Anser indicus) in Mongolia: Implications for disease transmission
Eli S. Bridge, Jeffrey F. Kelly, Xiangming Xiao, Nyambayar Batbayar, Tseveenmyadag Natsagdorj, Nichola J. Hill, John Y. Takekawa, Lucy A. Hawkes, Charles M. Bishop, Patrick J. Butler, Scott H. Newman
2015, Waterbirds (38) 123-132
Population connectivity is an important consideration in studies of disease transmission and biological conservation, especially with regard to migratory species. Determining how and when different subpopulations intermingle during different phases of the annual cycle can help identify important geographical regions or features as targets for conservation efforts and can help...
Exploration review
David R. Wilburn, Karyn A. Stanley, Nick A Karl
2015, Mining Engineering 16-38
This summary of international mineral exploration activities for the year 2014 draws upon information from industry sources, published literature, and specialists in the U.S. Geological Survey (USGS) National Minerals Information Center. The summary provides data on exploration budgets by region and mineral commodity, identifies significant mineral discoveries and areas of...
Stress- and structure-controlled anisotropy in a region of complex faulting—Yuha Desert, California
Elizabeth S. Cochran, Kayla A. Kroll
2015, Geophysical Journal International (202) 1109-1121
We examine shear velocity anisotropy in the Yuha Desert, California using aftershocks of the 2010 M7.2 El Mayor-Cucapah earthquake. The Yuha Desert is underlain by a complex network of right- and left-lateral conjugate faults, some of which experienced triggered slip during the El Mayor-Cucapah earthquake. An automated method that implements...
Incidental captures of Eastern Spotted Skunk in a high-elevation Red Spruce forest in Virginia
Corinne A. Diggins, David S. Jachowski, Jay Martin, W. Mark Ford
2015, Northeastern Naturalist (22) N6-N10
Spilogale putorius (Eastern Spotted Skunk) is considered rare in the southern Appalachian Mountains and throughout much of its range. We report incidental captures of 6 Eastern Spotted Skunks in a high-elevation Picea rubens (Red Spruce) forest in southwestern Virginia during late February and March 2014. At 1520 m, these observations...
Storm-influenced deltaic deposits of the Middle Jurassic Gaikema Sandstone in a measured section on the northern Iniskin Peninsula, Cook Inlet basin, Alaska
Richard G. Stanley, Kenneth P. Helmold, David L. LePain
2015, Report
Middle Jurassic strata of the Gaikema Sandstone were deposited about 170 million years ago on a delta that was located on the western shoreline of the Cook Inlet basin (Detterman and Hartsock, 1966; LePain and others, 2011, 2013). The delta was built by swift, sediment-laden rivers that flowed southeastward from...
Getting ocean acidification on decision makers' to-do lists: dissecting the process through case studies
Sarah R. Cooley, Elizabeth B. Jewett, Julie Reichert, Lisa L. Robbins, Gyami Shrestha, Dan Wieczorek, Stephen B. Weisberg
2015, Oceanography 198-211
Much of the detailed, incremental knowledge being generated by current scientific research on ocean acidification (OA) does not directly address the needs of decision makers, who are asking broad questions such as: Where will OA harm marine resources next? When will this happen? Who will be affected? And how much...
Linking carbon and water limitations to drought-induced mortality of Pinus flexilis seedlings
Keith Reinhardt, Matthew J. Germino, Lara M. Kueppers, Jean-Christophe Domec, Jeffry Mitton
2015, Tree Physiology (35) 771-782
Survival of tree seedlings at high elevations has been shown to be limited by thermal constraints on carbon balance, but it is unknown if carbon relations also limit seedling survival at lower elevations, where water relations may be more important. We measured and modeled carbon fluxes and water relations in...
Interpreting fluid pressure anomalies in shallow intraplate argillaceous formations
Christopher E. Neuzil
2015, Geophysical Research Letters (42) 4801-4808
Investigations have revealed several instances of apparently isolated highs or lows in pore fluid potential in shallow (< ~ 1 km depth) argillaceous formations in intraplate settings. Formations with the pressure anomalies are distinguished by (1) smaller ratios of hydraulic conductivity to formation thickness and (2) smaller hydraulic (or pressure) diffusivities...
Dynamic hypoxic zones in Lake Erie compress fish habitat, altering vulnerability to fishing gears
Richard T. Kraus, Carey T. Knight, Troy M. Farmer, Ann Marie Gorman, Paris D. Collingsworth, Glenn J. Warren, Patrick M. Kocovsky, Joseph D. Conroy
2015, Canadian Journal of Fisheries and Aquatic Sciences (72) 797-806
Seasonal degradation of aquatic habitats from hypoxia occurs in numerous freshwater and coastal marine systems and can result in direct mortality or displacement of fish. Yet, fishery landings from these systems are frequently unresponsive to changes in the severity and extent of hypoxia, and population-scale effects have been difficult to...
Group composition effects on aggressive interpack interactions of gray wolves in Yellowstone National Park
Kira A. Cassidy, Daniel R. MacNulty, Daniel R. Stahler, Douglas W. Smith, L. David Mech
2015, Behavioral Ecology (26) 1352-1360
Knowledge of characteristics that promote group success during intraspecific encounters is key to understanding the adaptive advantages of sociality for many group-living species. In addition, some individuals in a group may be more likely than others to influence intergroup conflicts, a relatively neglected idea in research on social animals. Here...
Suburbanization, estrogen contamination, and sex ratio in wild amphibian populations
Max R. Lambert, Geoffrey S. J. Giller, Larry B. Barber, Kevin C. Fitzgerald, David K. Skelly
2015, Proceedings of the National Academy of Sciences of the United States of America (112) 11881-11886
Research on endocrine disruption in frog populations, such as shifts in sex ratios and feminization of males, has predominantly focused on agricultural pesticides. Recent evidence suggests that suburban landscapes harbor amphibian populations exhibiting similar levels of endocrine disruption; however the endocrine disrupting chemical (EDC) sources are unknown. Here, we show...
Demographic and spatiotemporal patterns of avian influenza infection at the continental scale, and in relation to annual life cycle of a migratory host
Rodolfo Nallar, Zsuzsanna Papp, Tasha Epp, Frederick A. Leighton, Seth R. Swafford, Thomas J. DeLiberto, Robert J. Dusek, S. Ip, Jeffrey S. Hall, Yohannes Berhane, Samantha E.J. Gibbs, Catherine Soos
2015, PLoS ONE (10)
Since the spread of highly pathogenic avian influenza (HPAI) H5N1 in the eastern hemisphere, numerous surveillance programs and studies have been undertaken to detect the occurrence, distribution, or spread of avian influenza viruses (AIV) in wild bird populations worldwide. To identify demographic determinants and spatiotemporal patterns of AIV infection in...
