Estimating abundance of an open population with an N-mixture model using auxiliary data on animal movements
Alison C. Ketz, Therese L. Johnson, Ryan J. Monello, John A. Mack, Janet L. George, Mevin Hooten, Benjamin R. Kraft, Margaret A. Wild, N. Thompson Hobbs
2019, Ecological Applications (28) 816-825
Accurate assessment of abundance forms a central challenge in population ecology and wildlife management. Many statistical techniques have been developed to estimate population sizes because populations change over time and space and to correct for the bias resulting from animals that are present in a study area but not observed....
Bright carbonate surfaces on Ceres as remnants of salt-rich water fountains
Ottavian Ruesch, Lynnae Quick, Margaret Evelyn Landis, M.M. Sori, O. Cadek, P. Broz, K.A. Otto, Michael T. Bland, S. Byrne, J.C. Castillo-Rogez, H. Hiesinger, R. Jaumann, K. Krohn, L.A. McFadden, A. Nathues, A. Neesemann, F. Preusker, T. Roatsch, P.M. Schenk, J. E. C. Scully, M.V. Sykes, D.A. Williams, C.A. Raymond, C.T. Russell.
2019, Icarus (320) 39-48
Vinalia and Cerealia Faculae are bright and salt-rich localized areas in Occator crater on Ceres. The predominance of the near-infrared signature of sodium carbonate on these surfaces suggests their original material was a brine. Here we analyze Dawn Framing Camera's images and characterize the surfaces as composed of a central...
Phenotypic plasticity and climate change: Can polar bears respond to longer Arctic summers with an adaptive fast?
John P. Whiteman, Henry J. Harlow, George M. Durner, Eric V Regher, Steven C. Amstrup, Merav Ben-David
2019, Oecologia (186) 369-381
Plasticity in the physiological and behavioural responses of animals to prolonged food shortages may determine the persistence of species under climate warming. This is particularly applicable for species that can “adaptively fast” by conserving protein to protect organ function while catabolizing endogenous tissues. Some Ursids, including polar bears (Ursus maritimus),...
Hydrogeologic controls and geochemical indicators of groundwater movement in the Niles Cone and southern East Bay Plain groundwater subbasins, Alameda County, California
Nicholas F. Teague, John A. Izbicki, Jim Borchers, Justin T. Kulongoski, Bryant C. Jurgens
2019, Scientific Investigations Report 2018-5003
Beginning in the 1970s, Alameda County Water District began infiltrating imported water through ponds in repurposed gravel quarries at the Quarry Lakes Regional Park, in the Niles Cone groundwater subbasin, to recharge groundwater and to minimize intrusion of saline, San Francisco Bay water into freshwater aquifers. Hydraulic connection between distinct...
Stream mercury export in response to contemporary timber harvesting methods (Pacific Coastal Mountains, Oregon, USA)
Chris S. Eckley, Collin A. Eagles-Smith, Michael T. Tate, Brandon M Kowalski, Robert Danehy, Sherri L Johnson, David P. Krabbenhoft
2019, Environmental Science & Technology (52) 1971-1980
Land-use activities can alter hydrological and biogeochemical processes that can affect the fate, transformation, and transport of mercury (Hg). Previous studies in boreal forests have shown that forestry operations can have profound, but variable effects on Hg export and methylmercury (MeHg) formation. The Pacific Northwest is an important...
Direct and indirect effects of tides on ecosystem-scale CO2 exchange in a brackish tidal marsh in Northern California
Sara Knox, Lisamarie Windham-Myers, Frank Anderson, Cove Sturtevant, Brian A. Bergamaschi
2019, Journal of Geophysical Research: Biogeosciences (123) 787-806
We investigated the direct and indirect influence of tides on net ecosystem exchange (NEE) of carbon dioxide (CO2) in a temperate brackish tidal marsh. NEE displayed a tidally driven pattern with obvious characteristics at the multiday scale, with greater net CO2uptake during spring tides than neap tides. Based on the...
Isotopic evidence that nitrogen enrichment intensifies nitrogen losses to the atmosphere from subtropical mangroves
Carla Roberta Goncalves Reis, Sasha C. Reed, Rafael Silva Oliveira, Gabriela Bielefeld Nardoto
2019, Ecosystems (22) 1126-1144
Nitrogen (N) enrichment can have large effects on mangroves’ capacity to provide critical ecosystem services by affecting fundamental functions such as N cycling and primary productivity. However, our understanding of excess N input effects on N cycling in mangroves remains quite limited. To advance our understanding of how N enrichment...
Understanding the genetic characteristics of Wild Brook Trout populations in North Carolina thanks to the guidance of Dr. Tim King
David C. Kazyak, Barbara A. Lubinski, Jacob M Rash, Tim L. King
2019, Conference Paper, Proceedings of the Wild Trout XII Symposium
We genotyped 7,588 brook trout representing 406 collections from across the State of North Carolina (Figure 1) at 12 microsatellite loci (King et al. 2012). The vast majority ofcollections appeared to represent single populations, based on general conformance to HardyWeinberg equilibrium and limited evidence for linkage-disequilibrium. Allelic diversity was low to moderate...
Monitoring and conservation of Japanese Murrelets and related seabirds in Japan
John F. Piatt, S Kim Nelson, Harry R. Carter
2019, Conference Paper, Status and Monitoring of Rare and Threatened Japanese Crested Murrelet
Of the 24 species in the Auk (or Alcidae) family of seabirds living in the northern hemisphere, 22 reside within the North Pacific Ocean. These “penguins of the north” use their small wings to “fly” underwater, some to more than 200 meters, where they catch and eat a variety of small fish...
Remaining populations of an upland stream fish persist in refugia defined by habitat features at multiple scales
Corey G. Dunn, Paul L. Angermeier
2019, Diversity and Distributions (25) 385-399
AimConserving stream biota could require strategies that preserve habitats conveying resistance to ecological impacts of changing land use and climate. Retrospective analyses of species’ responses to anthropogenic disturbances can inform such strategies. We developed a hierarchical framework to contrast environmental conditions underlying persistence versus extirpation of an...
Fena Valley Reservoir watershed and water-balance model updates and expansion of watershed modeling to southern Guam
Sarah N. Rosa, Lauren E. Hay
2019, Scientific Investigations Report 2017-5093
In 2014, the U.S. Geological Survey, in cooperation with the U.S. Department of Defense’s Strategic Environmental Research and Development Program, initiated a project to evaluate the potential impacts of projected climate-change on Department of Defense installations that rely on Guam’s water resources. A major task of that project was to...
Spatial autoregressive models for statistical inference from ecological data
Jay M. Ver Hoef, Erin E. Peterson, Mevin Hooten, Ephraim M. Hanks, Marie-Josée Fortin
2019, Ecological Monographs (88) 36-59
Ecological data often exhibit spatial pattern, which can be modeled as autocorrelation. Conditional autoregressive (CAR) and simultaneous autoregressive (SAR) models are network‐based models (also known as graphical models) specifically designed to model spatially autocorrelated data based on neighborhood relationships. We identify and discuss six different types...
The impact of late Holocene land-use change, climate variability, and sea-level rise on carbon storage in tidal freshwater wetlands on the southeastern United States Coastal Plain
Miriam Jones, Christopher E. Bernhardt, K. W. Krauss, Gregory E. Noe
2019, Journal of Geophysical Research: Biogeosciences (122) 3126-3141
This study examines Holocene impacts of changes in climate, land use, and sea-level rise (SLR) on sediment accretion, carbon accumulation rates (CAR), and vegetation along a transect of tidal freshwater forested wetlands (TFFW) to oligohaline marsh along the Waccamaw River, South Carolina (4 sites) and along the Savannah River, Georgia...
Exploring the historical earthquakes preceding the giant 1960 Chile earthquake in a time‐dependent seismogenic zone
M. Cisternas, M. Carvajal, Robert L. Wesson, L.L Ely, N Gorigoitia
2019, Bulletin of the Seismological Society of America (107) 2664-2675
New documentary findings and available paleoseismological evidence provide both new insights into the historical seismic sequence that ended with the giant 1960 south-central Chile earthquake and relevant information about the region’s seismogenic zone. According to the few available written records, this region was previously struck by earthquakes of varying size...
The role of baseflow in dissolved solids delivery to streams in the Upper Colorado River Basin
Christine Rumsey, Matthew P. Miller, Gregory E. Schwarz, Robert M. Hirsch, David D. Susong
Gregory Schwarz, Robert M. Hirsch, David Susong, editor(s)
2019, Hydrological Processes (31) 4705-4718
Salinity has a major effect on water users in the Colorado River Basin, estimated to cause almost $300 million per year in economic damages. The Colorado River Basin Salinity Control Program implements and manages projects to reduce salinity loads, investing millions of dollars per year in irrigation...
Nominal 30-m cropland extent map of continental Africa by integrating pixel-based and object-based algorithms using Sentinel-2 and Landsat-8 Data on Google Earth Engine
Jun Xiong, Prasad S. Thenkabail, James C. Tilton, Murali Krishna Gumma, Pardhasaradhi G. Teluguntla, Adam Oliphant, Russell G. Congalton, Kamini Yadav, Noel Gorelick
2019, Remote Sensing (9)
A satellite-derived cropland extent map at high spatial resolution (30-m or better) is a must for food and water security analysis. Precise and accurate global cropland extent maps, indicating cropland and non-cropland areas, are starting points to develop higher-level products such as crop watering methods (irrigated or rainfed), cropping intensities...
Twenty years (1990–2010) of geodetic monitoring of Galeras volcano (Colombia) from continuous tilt measurements.
Lourdes Narvaez Medina, Dario F Arcos, Maurizio Battaglia
2019, Journal of Volcanology and Geothermal Research (344) 232-245
Galeras - an andesitic stratovolcano part of the Galeras Volcanic Complex - is one of the most active volcanoes in Colombia. Historic activity is centered on a small-volume cone inside the youngest amphitheater, which breaches the west flank of the volcano. At least 30 confirmed eruption periods have been recorded...
MODIS phenology-derived, multi-year distribution of conterminous U.S. crop types
Richard Massey, T.T Sankey, Russ Congalton, Kamini Yadav, Prasad Thenkabail, Mutlu Ozdogan, Sanchez Meador
2019, Remote Sensing of Environment (198) 490-503
Innovative, open, and rapid methods to map crop types over large areas are needed for long-term cropland monitoring. We developed two novel and automated decision tree classification approaches to map crop types across the conterminous United States (U.S.) using MODIS 250 m resolution data:...
Avian predation on juvenile Salmonids: Spatial and temporal analysis based on acoustic and passive integrated transponder tags
Allen F. Evans, Quinn Payton, Aaron Turecek, Bradley D. Cramer, Ken Collis, Daniel D. Roby, Peter J. Loschl, Leah Sullivan, Skalski John, Mark Weiland, Curtis Dotson
2019, Transactions of the American Fisheries Society
We evaluated the impact of predation on juvenile steelhead Oncorhynchus mykiss and yearling and subyearling Chinook Salmon O. tshawytscha by piscivorous waterbirds from 11 different breeding colonies in the Columbia River basin during 2012 and 2014. Fish were tagged with both acoustic tags and PIT tags and were tracked via a network of hydrophone...
Organic geochemistry and toxicology of a stream impacted by unconventional oil and gas wastewater disposal operations
William H. Orem, Matthew S. Varonka, Lynn M. Crosby, Karl B. Haase, Keith A. Loftin, Michelle L. Hladik, Denise M. Akob, Calin Tatu, Adam C. Mumford, Jeanne B. Jaeschke, Anne L. Bates, Tiffani Schell, Isabelle M. Cozzarelli
2019, Applied Geochemistry (80) 155-167
Water and sediment extracts samples were analyzed for extractable hydrocarbons by gas chromatography/mass spectrometry (GC/MS) using an Agilent (Agilent Technologies, Palo Alto, CA, USA) 7890 series GC and 5975 electron ionization (EI) mass selective detector (MSD) operated in scan mode. Agilent ChemStation software was used for data acquisition and analysis...
A 15-year catalog of more than 1 million low-frequency earthquakes: Tracking tremor and slip along the deep San Andreas Fault
David R. Shelly
2019, Journal of Geophysical Research (122) 3739-3753
Low-frequency earthquakes (LFEs) are small, rapidly recurring slip events that occur on the deep extensions of some major faults. Their collective activation is often observed as a semi-continuous signal known as tectonic (or non-volcanic) tremor. This manuscript presents a catalog of more than 1 million LFEs detected along...
Using a process-based model of pre-eruptive seismic patterns to forecast evolving eruptive styles at Sinabung Volcano, Indonesia
Wendy A. McCausland, Hendra Gunawan, Randall A. White, Novianti Indrastuti, Cahya Patria, Yasa Suparman, Armen Putra, Hetty Triastuty, Mochammad Hendrasto
2019, Journal of Volcanology and Geothermal Research (382) 253-266
Most volcanoes worldwide are not monitored in real-time; for those that are, patterns of pre-eruptive earthquakes coupled with conceptual models of magma ascent enable short-term forecasting of eruption onset. Basic event locations, characterization of background seismicity, and recognition of changes in earthquake types and energy release are most important to...
U-Pb and Lu-Hf isotope, age, and trace-element data from zircons at four sites in the western Alaska Range and Talkeetna Mountains, Alaska
Erin Todd, Andrew R. C. Kylander-Clark, Alicja Wypych, Evan Twelker, Karri R. Sicard
2019, Report
This Division of Geological & Geophysical Surveys (DGGS) Raw Data File presents U-Pb geochronology and Lu-Hf isotopic compositions, age-dating results, and additional trace-elemental composition of zircons from four granitoids sampled during investigations by DGGS geologists in the western Alaska Range and the Talkeetna Mountains. The purpose of the Lu-Hf and...
Earth Resources Observation and Science (EROS) Center—Popular Websites
U.S. Geological Survey
2019, General Information Product 171
This general information product (GIP) lists websites related to the Earth Resources Observation and Science (EROS) Center and supersedes GIP 84....
Evidence for conservative transport of dissolved organic carbon in major river basins in the Gulf of Maine Watershed
Thomas G. Huntington, Collin S. Roesler, George R. Aiken
2019, Journal of Hydrology (573) 755-767
Transport and fate of dissolved organic carbon (DOC) in rivers are important aspects of the carbon cycle and the critical linkage between terrestrial, aquatic, and marine systems. Recent studies have quantified fluvial export to the marine environment in many systems, but in-stream losses of DOC are poorly constrained. This study...
