The effect of resolution on terrain feature extraction
Samantha Arundel, Wenwen Li, Xiran Zhou
2019, Conference Paper, Geomorphometry 2018
Recent increase in the production of high-resolution digital elevation models (DEMs) from lidar data has led to interest in their use for terrain mapping. Although the impact of different resolutions has been studied relative to terrain characteristics like roughness, slope and curvature, its relationship to the extraction of terrain features...
An importance–satisfaction analysis of trout license holders in Georgia
H. J. TenHarmsel, B. B. Boley, Brian J. Irwin, Cecil A. Jennings
2019, North American Journal of Fisheries Management (39) 1227-1241
As anglers become increasingly diverse, fisheries managers are challenged to find ways to satisfy users with divergent preferences while conserving a limited resource on a limited budget. With this management challenge in mind, this study combines previous angler specialization research with an importance–satisfaction analysis (ISA) to aid fisheries managers in...
Sequestration and transformation in chemically enhanced treatment wetlands: DOC, DBPPs and Nutrients
Philip A. M. Bachand, Sandra M. Bachand, Tamara E. C. Kraus, Dylan Stern, Yan Ling Liang, William R. Horwath
2019, Journal of Environmental Engineering (145)
We examined the effectiveness of chemically enhanced treatment wetlands (CETWs), wetlands that received water treated with coagulants, to remove dissolved organic carbon (DOC), disinfection byproduct precursors (DBPPs), nutrients and metals from agricultural drain water. Wetlands consisted of controls with no coagulant addition, ferric sulfate dosed and polyaluminum chloride dosed treatments....
Surface rupture and distributed deformation revealed by optical satellite imagery: The intraplate 2016 Mw 6.0 Petermann Ranges earthquake, Australia
Ryan D. Gold, Dan Clark, William D. Barnhart, Tamarah King, Mark Quigley, Richard W. Briggs
2019, Geophysical Research Letters (46) 10394-10403
High-resolution optical satellite imagery is used to quantify vertical surface deformation associated with the intraplate 20 May 2016 Mw 6.0 Petermann Ranges earthquake, Northern Territory, Australia. The 21 ╓ 1 km long NW-trending rupture resulted from reverse motion on a northeast-dipping fault. Vertical surface offsets of up to 0.7 ╓...
Assessment of larval fish assemblages and nursery habitat in the St. Clair River delta
Taaja Tucker, Robin L . DeBruyne, Edward F. Roseman, Douglas Larson, A. Scott McNaught
2019, Journal of Great Lakes Research (45) 762-776
The St. Clair River delta, part of the St. Clair-Detroit River System (SCDRS), is the most fished coastal wetland area in the Laurentian Great Lakes and provides nursery habitat for a...
Black Carp in North America: A description of range, habitats, time of year, and methods of reported captures
Patrick Kroboth, Cortney Cox, Duane Chapman, Gregory W. Whitledge
2019, North American Journal of Fisheries Management (39) 1046-1055
Black Carp Mylopharyngodon piceus are considered invasive in North America. Since the first wild capture in 2003, collection records have increased, yet information summarizing successful collection methods is lacking. Reported capture methods throughout the Black Carp's native and introduced ranges vary providing minimal aid for determining control and monitoring methods. Here, we...
Water velocity regulates macro-consumer herbivory on the benthic macrophyte Podostemum ceratophyllum Michx.
James L Wood, Jon W Skaggs, Caitlin C Conn, Mary Freeman
2019, Freshwater Biology (64) 2037-2045
1) Macrophytes influence aquatic ecosystems by increasing habitat complexity and providing trophic resources for aquatic fauna. While herbivory on freshwater macrophytes is widely documented in lakes, low-velocity riverine habitats, the influence of herbivory on macrophytes in higher-velocity habitats has rarely been examined. 2) We investigated the hypothesis that high...
Towards forecasting phreatic eruptions: Examples from Hakone volcano and some global equivalents
Kazutaka Mannen, Diana Roman, Graham Leonard, Stephanie Prejean, Mitsuhiro Nakagawa
2019, Earth, Planets, and Space (71)
No abstract available. ...
Characterizing and imaging sedimentary strata using depth-converted spectral ratios: An example from the Atlantic Coastal Plain of the Eastern U.S.
Thomas L. Pratt
2019, Bulletin of the Seismological Society of America (108) 2801-2815
Unconsolidated, near-surface sediments can have a profound influence on the amplitudes and frequencies of ground shaking during earthquakes, and these effects should be accounted for when using amplitude observations for seismic hazard assessments. This study explores methods to use teleseismic arrivals recorded on linear receiver arrays to characterize widespread, shallow...
The nucleoprotein and phosphoprotein are major determinants of the virulence of viral hemorrhagic septicemia virus in rainbow trout
Vikram N Vakharia, Jie Liu, Douglas Mckenney, Gael Kurath
2019, Journal of Virology (93)
Viral hemorrhagic septicemia virus (VHSV), a fish rhabdovirus, infects several marine and freshwater fish species. There are many strains of VHSV that affect different fish, but some strains of one genetic subgroup have gained high virulence in rainbow trout (Oncorhynchus mykiss). To define the genetic basis of high virulence in...
Non-native marine fishes in Florida: Updated checklist, population status and early detection/rapid response
Pamela J. Schofield, Lad Akins
2019, BioInvasions Records (8) 898-910
It has been ten years since the last comprehensive assessment of non-native marine fishes in Florida. Herein, we report sightings of 41 species from Florida coastal waters since the earliest reported sighting in 1984. Information is provided on the population status of each species (e.g., established, eradicated, unknown), and our...
Arsenic, antimony, mercury, and water temperature in streams near Stibnite mining area, central Idaho, 2011–17
Austin K. Baldwin, Alexandra B. Etheridge
2019, Scientific Investigations Report 2019-5072
Mineralization and historical mining of stibnite (antimony sulfide), tungsten, gold, silver, and mercury in the headwaters of the East Fork of the South Fork Salmon River (EFSFSR) near the former town of Stibnite in central Idaho resulted in water-quality impairments related to mercury, antimony, and arsenic. Additionally, mining-related disturbances and...
Juvenile Chinook salmon (Oncorhynchus tshawytscha) survival in Lookout Point Reservoir, Oregon, 2018
Tobias J. Kock, Russell W. Perry, Gabriel S. Hansen, Philip V. Haner, Adam C. Pope, John M. Plumb, Karen M. Cogliati, Amy C. Hansen
2019, Open-File Report 2019-1097
A field study was conducted to estimate survival of juvenile Chinook salmon (Oncorhynchus tshawytscha) in Lookout Point Reservoir, Oregon, during 2018. The study consisted of releasing three groups of genetically-marked fish into the reservoir, and sampling them monthly. Juveniles were released during April 10–13 (116,708 fish), May 15–18 (31,911 fish),...
Plants trap pollen to feed predatory arthropods as an indirect resistance against herbivory
Jenny Van Wyk, Billy Krimmel, Laure Crova, Ian S. Pearse
2019, Ecology (100)
Plants commonly employ indirect resistance to reduce herbivory by provisioning predatory arthropod populations with additional resources. Numerous predatory arthropods consume pollen that is entrapped on dense, wooly trichomes of plants. Over two seasons, we supplemented pollen on the wooly leaves of turkey mullein, Croton setiger, in natural...
Laboratory experiments of volcanic ash resuspension by wind
Vicken Etyemezian, Jack Gillies, Larry G. Mastin, Alice Crawford, Robert Hasson, Alexa R. Van Eaton, G. Nikolich
2019, Journal of Geophysical Research - Atmospheres (124) 9534-9560
Fresh volcanic eruption deposits tend to be loose, bare, and readily resuspended by wind. Major resuspension events in Patagonia, Iceland, and Alaska have lofted ash clouds with potential to impact aircraft, infrastructure, and downwind communities. However, poor constraints on this resuspension process limit our ability to model...
Hydrologic balance, water quality, chemical-mass balance, and geochemical modeling of hyperalkaline ponds at Big Marsh, Chicago, Illinois, 2016–17
Amy M. Gahala, Robert R. Seal, II, Nadine M. Piatak
2019, Scientific Investigations Report 2019-5078
Hyperalkaline (pH greater than 12) ponds and groundwater exist at Big Marsh near Lake Calumet, Chicago, Illinois, a site used by the steel industry during the mid-1900s to deposit steel- and iron-making waste, in particular, slag. The hyperalkaline ponds may pose a hazard to human health and the environment. The...
Development and evaluation of a record extension technique for estimating discharge at selected stream sites in New Hampshire
Scott A. Olson, Abraham J. Meyerhofer
2019, Scientific Investigations Report 2019-5066
Daily mean discharges are needed for rivers in New Hampshire for the management of instream flows. It is impractical, however, to continuously gage all streams in New Hampshire, and at many sites where information is needed, the discharge data required do not exist. For such sites, techniques for estimating discharge...
Santa Rosa's past and future earthquakes
Suzanne Hecker, Darcy K. McPhee, Victoria E. Langenheim, Janet T. Watt
2019, Fact Sheet 2019-3035
Santa Rosa is no stranger to earthquakes. This northern California city was damaged several times in the late 19th and early 20th centuries by shaking from earthquakes, culminating in the devastating earthquake of 1906, whose rupture passed 20 miles to the west of the city on the San Andreas Fault....
A physically based method of combining ADCP velocity data with point samples to compute suspended-sand discharge -- Application to the Rhone River, France
Guillaume Dramais, Benoit Camenen, Jerome Le Coz, David J. Topping, Christophe Peteuil, Gilles Pierrefeu
2019, Conference Paper, Proceedings of SEDHYD 2019
Measuring suspended-sand flux in rivers is a challenge since sand concentrations are highly variable in time and space throughout a river cross section. Most of the present methodologies rely on point or depth-integrated sampling (Nolan et al., 2005, Topping et al., 2016). The standard method estimates mean concentration and multiply...
A food web modeling assessment of Asian Carp impacts in the Middle and Upper Mississippi River, USA
Nicholas W. Kramer, Quinton E. Phelps, Clay Pierce, Michael E. Colvin
2019, Food Webs (21)
The invasion of non-native fishes has caused a great detriment to many of our native fishes. Since the introduction of invasive carps, such as Silver, Bighead, Common and Grass Carp, managers and researcher have been struggling to remove these species while also hypothesizing the detriment of further invasion. This study developed...
Invertebrate prey contributions to juvenile Coho Salmon diet from riparian habitats along three Alaska streams: Implications for environmental change
Jess Grunblatt, Benjamin E. Meyer, Mark S. Wipfli
2019, Journal of Freshwater Ecology (34) 617-631
Stream fish rely on a mix of terrestrial and aquatic prey sources. While the importance of terrestrial invertebrates as a food source for stream fish is well documented, the role of aquatic insects that emerge from the stream as winged adult insects (aquatic winged adults) and return to the stream...
Flood-inundation maps for a 23-mile reach of the Medina River at Bandera, Texas, 2018
Namjeong Choi, Frank L. Engel
2019, Scientific Investigations Report 2019-5067
In 2018, the U.S. Geological Survey (USGS), in cooperation with the Bandera County River Authority and Groundwater District and the Texas Water Development Board, studied floods through the period of record to create a library of flood-inundation maps for the Medina River at Bandera, Texas. Digital flood-inundation maps for a...
Flood warning toolset for the Medina River in Bandera County, Texas
Frank L. Engel, Namjeong Choi
2019, Fact Sheet 2019-3043
OverviewFloods are the most common natural disaster in the United States. The Medina River in Bandera County, Texas, is in the Edwards Plateau, where high-intensity rain rates and steep terrain frequently contribute to severe flash flooding capable of causing loss of life and property. For example, the July...
Evaluating k-nearest neighbor (kNN) imputation models for species-level aboveground forest biomass mapping in northeast China
Yuanyuan Fu, Hong S He, Todd Hawbaker, Paul D. Henne, Zhiliang Zhu, David R. Larsen
2019, Remote Sensing (17) 1-20
Quantifying spatially explicit or pixel-level aboveground forest biomass (AFB) across large regions is critical for measuring forest carbon sequestration capacity, assessing forest carbon balance, and revealing changes in the structure and function of forest ecosystems. When AFB is measured at the species level using widely available remote sensing data, regional...
Acoustic tag retention rate varies between juvenile green and hawksbill sea turtles
Thomas Selby, Brian Smith, Michael Cherkiss, Andrew Crowder, Zandy Hillis-Starr, Clayton Pollock, Kristen Hart
2019, Animal Biotelemetry (7)
Background Biotelemetry has become a key tool for studying marine animals in the last decade, and a wide range of electronic tags are now available for answering a range of research questions. However, comparatively, less attention has been given to attachment methods for these tags and the implications of tag retention...
