Estimating visitor use and economic contributions of National Park visitor spending
Lynne Koontz, Catherine Cullinane Thomas
2020, Book chapter, Valuing U.S. National Parks and Programs
This chapter provides an overview of the National Park Service (NPS) methods for estimating visitor spending and calculating economic contributions of visitor spending in terms of jobs supported, wage and labor income, and total economic activity. The Visitor Spending Effects model combines visitor spending patterns and trip characteristic data with...
Investigating bedload transport under asymmetrical waves using a coupled ocean-wave model
Tarandeep S. Kalra, Christopher R. Sherwood, John C. Warner, Yashar Rafati, Tian Jian Hsu
2020, Conference Paper
Transport by asymmetrical wave motions plays a key role in cross-shore movement of sand, which is important for bar migration, exchange through tidal inlets, and beach recovery after storms. We have implemented a modified version of the SANTOSS formulation in the three-dimensional open-source Coupled-Ocean-Atmosphere-Wave-Sediment Transport (COAWST) modeling framework. The calculation...
Modeling the morphological response of a barrier island to Hurricane Matthew
Ellen Quataert, Marlies van der Lugt, Christopher R. Sherwood, Maarten van Oormondt, Ap van Dongeran
2020, Conference Paper, Coastal sediments 2019: Proceedings of the 9th international conference
Surge and wave forcing from Hurricane Matthew caused a breach south of Matanzas Inlet (FL, USA) on a complex barrier island, including sandy dunes, hard structures (residential buildings and a highway), wetlands, and the US Intracoastal Waterway. In this paper, the skill of the XBeach model to predict hurricane-induced barrier...
Establishing genome sizes of focal fishery and aquaculture species along Baja California, Mexico
Constanza del Mar Ochoa-Saloma, Jill A. Jenkins, Manuel A. Segovia, Miguel A. Del Rio-Portilla, Carmen G. Paniagua-Chavez
2020, Conservation Genetics Resources (12) 301-309
Genome size—the total haploid content of nuclear DNA— is constant in all cells in individuals within a species, but differs among species. Consequently, the genome size is a quantifiable genetic signature that not only characterizes a species, but it can reflect chromatin modifications, which play fundamental roles in most biological...
Hydroseeding tackifiers and dryland moss restoration potential
W. Dillon Blankenship, Lea A. Condon, David A. Pyke
2020, Restoration Ecology (28) S127-S138
Tackifiers are long‐chain carbon compounds used for soil stabilization and hydroseeding and could provide a vehicle for biological soil crust restoration. We examined the sensitivity of two dryland mosses, Bryum argenteum and Syntrichia ruralis, to three common tackifiers ‐ guar, psyllium, and polyacrylamide (PAM) ‐ at 0.5x, 1.0x, and 2.0x of recommended (x) concentrations...
Upwelling buffers climate change impacts on coral reefs of the eastern tropical Pacific
Carly J. Randall, Lauren T. Toth, James J Leichter, Juan L Mate, Richard B. Aronson
2020, Ecology (2)
Corals of the eastern tropical Pacific live in a marginal and oceanographically dynamic environment. Along the Pacific coast of Panamá, stronger seasonal upwelling in the Gulf of Panamá in the east transitions to weaker upwelling in the Gulf of Chiriquí in the west, resulting in complex...
Enhanced El Niño-Southern Oscillation variability in recent decades
Pamela R. Grothe, Kim M. Cobb, Giovanni Liguori, Emanuele Di Lorenzo, Antonietta Capotondi, Yanbin Lu, Hai Cheng, R. Lawrence Edwards, John R. Southon, Guaciara M. Santos, Daniel M. Decampo, Jean Lynch-Stieglitz, Tianran Chen, Hussein R. Sayani, Diane M. Thompson, Jessica L. Conroy, Andrea L. Moore, Kayla Townsend, Melat Hagos, Gemma O’Connor, Lauren T. Toth
2020, Geophysical Research Letters (46)
The El Niño–Southern Oscillation (ENSO) represents the largest source of year-to-year global climate variability. While Earth system models suggest a range of possible shifts in ENSO properties under continued greenhouse gas forcing, many centuries of preindustrial climate data are required to detect a potential shift in the...
Hydraulic tomography: 3D hydraulic conductivity, fracture network, and connectivity in mudstone
Claire R. Tiedeman, Warren Barrash
2020, Groundwater (58) 238-257
We present the first demonstration of hydraulic tomography (HT) to estimate the three-dimensional (3D) hydraulic conductivity (K) distribution of a fractured aquifer at high-resolution field scale (HRFS), including the fracture network and connectivity through it. We invert drawdown data collected from packer-isolated borehole intervals during 42...
Spatial and temporal diving behavior of non-breeding common murres during two summers of contrasting ocean conditions
Stephanie A Laredo, Rachael A Orben, Robert M. Suryan, Donald E. Lyons, Josh Adams
2020, Journal of Experimental Marine Biology and Ecology 13-24
Successful foraging of marine predators depends on environmental conditions, which also influence prey availability. Neutral or negative El Niño Southern Oscillation and Pacific Decadal Oscillation ocean conditions during the summer of 2013 and strongly positive conditions during the summer of 2015 in the northern California Current System provided a case...
Conservation reliance of a threatened snake on rice agriculture
Brian J. Halstead, Jonathan P. Rose, Gabriel Reyes, Glenn D. Wylie, Michael L. Casazza
2020, Global Ecology and Conservation (19)
Conservation-reliant species require perpetual management by humans to persist. But do species that persist largely in human-dominated landscapes actually require conditions maintained by humans? Because most extant populations of giant gartersnakes (Thamnophis gigas) inhabit the highly modified rice agricultural regions of the Sacramento Valley, we sought to evaluate whether giant...
Validity of age estimates from muskellunge (Esox masquinongy) fin rays and associated effects on estimates of growth
Derek P. Crane, Marinda R. Cornett, Cory J. Bauerlien, Michael L. Hawkins, Daniel A. Isermann, Jeff L. Hansbarger, Kevin L. Kapuscinski, Jonathan R. Meerbeek, Timothy D. Simonson, Jeffrey M. Kampa
2020, Canadian Journal of Fisheries and Aquatic Sciences (77) 69-80
Accurate age estimates are critical for understanding life histories of fishes and developing management strategies for fish populations. However, validation of age estimates requires known-age fish, which are often lacking. We used known-age (ages 1–25) muskellunge (Esox masquinongy) to determine the precision and accuracy of age estimates from fin rays....
Trends in biodiversity and habitat quantification tools used for market‐based conservation in the United States
Scott J. Chiavacci, Emily Pindilli
2020, Conservation Biology (34) 125-136
Market-based conservation mechanisms are designed to facilitate conservation and mitigation actions for habitat and biodiversity. Their potential is partly hindered, however, by issues surrounding the quantification tools used to assess habitat quality and functionality. Specifically, a lack of transparency and standardization in tool development and gaps in tool...
Kinematic rupture modeling of ground motion from the M7 Kumamoto, Japan earthquake
Arben Pitarka, Robert Graves, Kojiro Irikura, Ken Miyakoshi, Artie Rogers
2020, Pure and Applied Geophysics (177) 2199-2221
We analyzed a kinematic earthquake rupture generator that combines the randomized spatial field approach of Graves and Pitarka (Bull Seismol Soc Am 106:2136–2153, <a id="ref-link-section-d19147e472" title="Graves, R., & Pitarka, A. (2016). Kinematic ground motion simulations on rough faults including effects of 3D Stochastic velocity perturbations. Bulletin of...
Revisiting “An Exercise in Groundwater Model Calibration and Prediction” after 30 years: Insights and New Directions
Randall J. Hunt, Michael N. Fienen, Jeremy T. White
2020, Groundwater (58) 168-182
In 1988, an important publication moved model calibration and forecasting beyond case studies and theoretical analysis. It reported on a somewhat idyllic graduate student modeling exercise where many of the system properties were known; the primary forecasts of interest were heads in pumping wells after a...
Songbird feathers as indicators of mercury exposure: High variability and low predictive power suggest limitations
Katherine E. Low, Danielle K. Ramsden, Allyson K. Jackson, Colleen Emery, W. Douglas Robinson, Jim Randolph, Collin A. Eagles-Smith
2020, Ecotoxicology (29) 1281-1292
Although feathers are commonly used to monitor mercury (Hg) in avian populations, their reliability as a sampling matrix has not been thoroughly assessed for many avian species, including most songbirds (Order Passeriformes). To better understand relationships between total Hg (THg) concentrations in feathers and other tissues for birds in the...
Advances in computational morphodynamics using the International River Interface Cooperative (iRIC) software
Yasuyuki Shimizu, Jonathan M. Nelson
2020, Earth Surface Processes and Landforms (45) 11-37
Results from computational morphodynamics modeling of coupled flow-bed-sediment systems are described for ten applications as a review of recent advances in the field. Each of these applications is drawn from solvers included in the public-domain International River Interface Cooperative (iRIC) software package. For mesoscale river features such as bars, predictions...
Ecosystem processes, landcover, climate, and human settlement shape dynamic distributions for golden eagle across the western US
J. D. Tack, B.R. Noon, Zachary H. Bowen, B.C. Fedy
2020, Animal Conservation (23) 72-82
Species–environment relationships for highly mobile species outside of the breeding season are often highly dynamic in response to the collective effects of ever‐changing climatic conditions, food resources, and anthropogenic disturbance. Capturing dynamic space‐use patterns in a model‐based framework is critical as model inference often drives place‐based conservation planning. We applied...
Assessment experimental semivariogram uncertainty in the presence of a polynomial drift
Erten Oktay, Eulogio Pardo-Iguzquiza, Ricardo A. Olea
2020, Natural Resources Research (29) 1087-1099
The semivariogram, which measures the spatial variability between experimental data, is generally used as a structural input in all two-point geostatistical procedures. However, in most geoscience applications, experimental semivariograms are usually computed from a limited number of sparsely spaced measurements, which results in uncertainty associated with the semivariance values estimated...
Statistical learning mitigation of false positives from template-detected data in automated acoustic wildlife monitoring
Cathleen M. Balantic, Therese M. Donovan
2020, Bioacoustics: The International Journal of Animal Sound and its Recording (29) 296-321
Audio sampling of the environment can provide long-term, landscape-scale presence-absence data to model populations of sound-producing wildlife. Automated detection systems allow researchers to avoid manually searching through large volumes of recordings, but often produce unacceptable false positive rates. We developed methods that allow researchers to improve template-based automated detection using...
Sedimentary evidence of prehistoric distant-source tsunamis in the Hawaiian Islands
SeanPaul La Selle, Bruce M. Richmond, Bruce E. Jaffe, Alan Nelson, Frances Griswold, Maria E.M. Arcos, Catherine Chague, James M. Bishop, Piero Bellanova, Haunani H. Kane, Brent D. Lunghino, Guy R. Gelfenbaum
2020, Sedimentology (67) 1249-1273
Over the past 200 years of written records, the Hawaiian Islands have experienced tens of tsunamis generated by earthquakes in the subduction zones of the Pacific "Ring of Fire" (e.g., Alaska-Aleutian, Kuril-Kamchatka, Chile, and Japan). Mapping and dating anomalous beds of sand and silt deposited by tsunamis in low-lying...
How lipid content and temperature affect American shad (Alosa sapidissima) attempt rate and sprint swimming: Implications for overcoming migration barriers
Shannon Michael Bayse, Stephen D. McCormick, Theodore R. Castro-Santos
2020, Canadian Journal of Fisheries and Aquatic Sciences (76) 2235-2244
How seasonal effects such as temperature increases and reduced lipid content affect the ability of anadromous fishes to traverse high-velocity barriers and sprint swimming is poorly understood. We evaluated American shad (Alosa sapidissima) swimming performance in a flume against high flow velocities (2.5–3.7 m·s−1) during the upstream migration period (April–May;...
Surficial geochemistry and bioaccessibility of tellurium in semi-arid mine tailings
Sarah M. Hayes, Nicole A Ramos
2020, Environmental Chemistry (16) 251-265
Tellurium (Te) is a critical element due to its use in solar technology. However, some forms are highly toxic. Few studies have examined Te behavior in the surficial environment, thus little is known about its potential human and environmental health impacts. This study characterizes two physicochemically distinct Te-enriched mine...
Weak effects of geolocators on small birds: a meta‐analysis controlled for phylogeny and publication bias
Vojtech Brlik, Jaroslav Kolecek, Malcolm Burgess, Steffen Hahn, Diana Humple, Milos Krist, Janne Ouwehand, Emily L. Weiser, Peter Adamik, Jose A. Alves, Debora Arlt, Sanja Barisic, Detlef Becker, Eduardo J. Belda, Vaclav Beran, Christiaan Both, Susana P. Bravo, Martins Briedis, Chutny Bohumir, Davor Cikovic, Nathan W. Cooper, Joana S. Costa, Victor R. Cueto, Tamara Emmenegger, Kevin Fraser, Olivier Gilg, Marina Guerrero, Michael T. Hallworth, Chris Hewson, Frederic Jiguet, James Johnson, Tosha Kelly, Dmitry Kishkinev, Michel Leconte, Terje Lislevand, Simeon Lisovski, Cosme Lopez, Kent P. McFarland, Peter P. Marra, Steven M. Matsuoka, Matyjasiak. Piotr, Christoph M. Meier, Benjamin Metzger, Juan S. Monros, Roland Neumann, Amy Newman, Ryan Norris, Tomas Part, Vaclav Pavel, Noah Perlut, Markus Piha, Jeroen Reneerkens, Christopher C. Rimmer, Amelie Roberto-Charro, Chiara Scandolara, Natalia Sokolova, Makiko Takenaka, Dirk Tolkmitt, Herman van Oosten, Arndt H. J. Wellbrock, Hazel Wheeler, Jan van der Winden, Klaudia Witte, Brad Woodworth, Petr Prochazka
2020, Journal of Animal Ecology (89) 207-220
Currently, the deployment of tracking devices is one of the most frequently used approaches to study movement ecology of birds. Recent miniaturisation of light‐level geolocators enabled studying small bird species whose migratory patterns were widely unknown. However, geolocators may reduce vital rates in tagged birds and may bias obtained movement...
Quaternary eolian dunes and sand sheets in inland locations of the Atlantic Coastal Plain Province, USA
Christopher S. Swezey
2020, Book chapter, Inland dunes of North America
Quaternary eolian dunes and sand sheets that are stabilized by vegetation are present throughout many inland locations of the Atlantic Coastal Plain province (USA). These locations include river valleys, the Carolina Sandhills region, adjacent to Carolina Bays, and upland areas of the northern coastal plain. The eolian dunes...
Community tools for cartographic and photogrammetric processing of Mars Express HRSC images
Randolph L. Kirk, Elpitha Howington-Kraus, Kenneth Edmundson, Bonnie L. Redding, Donna M. Galuszka, Trent M. Hare, K. Gwinner
2020, Book chapter, Planetary remote sensing and mapping
In this chapter we describe the software we have developed for photogrammetric processing of images from the Mars Express High Resolution Stereo Camera (MEX HRSC) to produce digital topographic models (DTMs) and orthoimages, as well as testing we have performed. HRSC has returned images, including stereo and color coverage of...
