The morphology of transverse aeolian ridges on Mars
Paul Geissler, Justin T. Wilgus
2017, Aeolian Research (26) 63-71
A preliminary survey of publicly released high resolution digital terrain models (DTMs) produced by the High Resolution Imaging Science Experiment (HiRISE) camera on Mars Reconnaissance Orbiter identified transverse aeolian ridges (TARs) in 154 DTMs in latitudes from 50°S to 40°N. Consistent with previous surveys, the TARs identified in HiRISE DTMs...
Temporal genetic population structure and interannual variation in migration behavior of Pacific Lamprey Entosphenus tridentatus
Benjamin J. Clemens, Lance A. Wyss, Rebecca McCoun, Ian Courter, Lawrence Schwabe, Christopher Peery, Carl B. Schreck, Erin K. Spice, Margaret F. Docker
2017, Hydrobiologia (794) 223-240
Studies using neutral loci suggest that Pacific lamprey, Entosphenus tridentatus, lack strong spatial genetic population structure. However, it is unknown whether temporal genetic population structure exists. We tested whether adult Pacific lamprey: (1) show temporal genetic population structure; and (2) migrate different distances between years. We non-lethally sampled lamprey...
Genetic responses to rapid change in the environment during the anthropocene
David A. Tallmon, Ryan Kovach
2017, Book chapter, Reference module in earth systems and environmental sciences
Humans have greatly affected the genetic composition of many different organisms during the Anthropocene. Humans cause genetic changes by affecting the direction and magnitude of evolutionary forces that act to create the Earth's biota. In many cases, we expect the outcome of human actions to be extinction and hybridization of...
Reexamining ultrafiltration and solute transport in groundwater
Christopher E. Neuzil, Mark Person
2017, Water Resources Research (53) 4922-4941
Geologic ultrafiltration—slowing of solutes with respect to flowing groundwater—poses a conundrum: it is consistently observed experimentally in clay-rich lithologies, but has been difficult to identify in subsurface data. Resolving this could be important for clarifying clay and shale transport properties at large scales as well as interpreting solute and isotope...
Reflected stochastic differential equation models for constrained animal movement
Ephraim M. Hanks, Devin S. Johnson, Mevin Hooten
2017, Journal of Agricultural, Biological, and Environmental Statistics (22) 353-372
Movement for many animal species is constrained in space by barriers such as rivers, shorelines, or impassable cliffs. We develop an approach for modeling animal movement constrained in space by considering a class of constrained stochastic processes, reflected stochastic differential equations. Our approach generalizes existing methods for modeling unconstrained animal...
A physical model for extreme drought over southwest Asia
Andrew Hoell, Chris Funk, Mathew Barlow, Forrest Cannon
2017, Book chapter, Climate extremes: Patterns and mechanisms
The socioeconomic difficulties of southwest Asia, defined as the area bound by the domain 25°N–40°N and 40°E–70°E, are exacerbated by extreme precipitation deficits during the November–April rainy season. The precipitation deficits during many southwest Asia droughts have been examined in terms of the forcing by climate variability originating over the...
A multistate dynamic site occupancy model for spatially aggregated sessile communities
Keiichi Fukaya, J. Andrew Royle, Takehiro Okuda, Masahiro Nakaoka, Takashi Noda
2017, Methods in Ecology and Evolution (8) 757-767
Estimation of transition probabilities of sessile communities seems easy in principle but may still be difficult in practice because resampling error (i.e. a failure to resample exactly the same location at fixed points) may cause significant estimation bias. Previous studies have developed novel analytical methods to correct...
Geodetic slip model of the 3 September 2016 Mw 5.8 Pawnee, Oklahoma, earthquake: Evidence for fault‐zone collapse
Frederick Pollitz, Charles W. Wicks Jr., Martin Schoenball, William L. Ellsworth, Mark Murray
2017, Seismological Research Letters (88) 983-993
The 3 September 2016 Mw 5.8 Pawnee earthquake in northern Oklahoma is the largest earthquake ever recorded in Oklahoma. The coseismic deformation was measured with both Interferometric Synthetic Aperture Radar and Global Positioning System (GPS), with measureable signals of order 1 cm and 1 mm, respectively. We derive a coseismic slip model from Sentinel‐1A...
A land cover change detection and classification protocol for updating Alaska NLCD 2001 to 2011
Suming Jin, Limin Yang, Zhe Zhu, Collin G. Homer
2017, Remote Sensing of Environment (195) 44-55
Monitoring and mapping land cover changes are important ways to support evaluation of the status and transition of ecosystems. The Alaska National Land Cover Database (NLCD) 2001 was the first 30-m resolution baseline land cover product of the entire state derived from circa 2001 Landsat imagery and geospatial ancillary data....
Sediment source fingerprinting as an aid to catchment management: A review of the current state of knowledge and a methodological decision-tree for end-users
A.L Collins, S. Pulley, I.D.L Foster, Allen C. Gellis, P. Porto, A.J. Horowitz
2017, Journal of Environmental Management (194) 86-108
The growing awareness of the environmental significance of fine-grained sediment fluxes through catchment systems continues to underscore the need for reliable information on the principal sources of this material. Source estimates are difficult to obtain using traditional monitoring techniques, but sediment source fingerprinting or tracing procedures, have emerged as a...
Forecasted range shifts of arid-land fishes in response to climate change
James E. Whitney, Joanna B. Whittier, Craig P. Paukert, Julian D. Olden, Angela L. Strecker
2017, Reviews in Fish Biology and Fisheries (27) 463-479
Climate change is poised to alter the distributional limits, center, and size of many species. Traits may influence different aspects of range shifts, with trophic generality facilitating shifts at the leading edge, and greater thermal tolerance limiting contractions at the trailing edge. The generality of relationships between traits and range...
Erosion characteristics and horizontal variability for small erosion depths in the Sacramento-San Joaquin River Delta, California, USA
David H. Schoellhamer, Andrew J. Manning, Paul A. Work
2017, Ocean Dynamics (67) 799-811
Erodibility of cohesive sediment in the Sacramento-San Joaquin River Delta (Delta) was investigated with an erosion microcosm. Erosion depths in the Delta and in the microcosm were estimated to be about one floc diameter over a range of shear stresses and times comparable to half of a typical tidal cycle....
Aerodynamic roughness length estimation with lidar and imaging spectroscopy in a shrub-dominated dryland
Aihua Li, Wenguang Zhao, Jessica J Mitchell, Nancy F. Glenn, Matthew J. Germino, Joel B. Sankey, Richard M. Allen
2017, Photogrammetric Engineering and Remote Sensing (83) 415-427
The aerodynamic roughness length (Z0 m) serves an important role in the flux exchange between the land surface and atmosphere. In this study, airborne lidar (ALS), terrestrial lidar (TLS), and imaging spectroscopy data were integrated to develop and test two approaches to estimate Z0 m over a shrub dominated dryland study area in...
Projecting community changes in hazard exposure to support long-term risk reduction: A case study of tsunami hazards in the U.S. Pacific Northwest
Benjamin M. Sleeter, Nathan J. Wood, Christopher E. Soulard, Tamara Wilson
2017, International Journal of Disaster Risk Reduction (22) 10-22
Tsunamis have the potential to cause considerable damage to communities along the U.S. Pacific Northwest coastline. As coastal communities expand over time, the potential societal impact of tsunami inundation changes. To understand how community exposure to tsunami hazards may change in coming decades, we projected future development (i.e. urban, residential,...
Constraining the thermal history of the North American Midcontinent Rift System using carbonate clumped isotopes and organic thermal maturity indices
Timothy M. Gallagher, Nathan D. Sheldon, Jeffrey L. Mauk, Sierra V. Petersen, Nur Gueneli, Jochen J. Brocks
2017, Precambrian Research (294) 53-66
The Midcontinent Rift System (MRS) is a Late Mesoproterozoic (∼1.1 Ga) sequence of volcanic and sedimentary rocks exposed in the Lake Superior Region of North America. The MRS continues to be the focus of much research due to its economic mineral deposits as well as its archive of Precambrian life and...
Uncertainties in forecasting the response of polar bears to global climate change
David C. Douglas, Todd C. Atwood
Andy Butterworth, editor(s)
2017, Book chapter, Marine animal welfare
Several sources of uncertainty affect how precisely the future status of polar bears (Ursus maritimus) can be forecasted. Foremost are unknowns about the future levels of global greenhouse gas emissions, which could range from an unabated increase to an aggressively mitigated reduction. Uncertainties also arise because different climate...
Lizard activity and abundance greater in burned habitat of a xeric montane forest
Kevin L. Fouts, Clinton T. Moore, Kristine D. Johnson, John C. Maerz
2017, Journal of Fish and Wildlife Management (8) 181-192
Restoring the natural or historical state of ecosystems is a common objective among resource managers, but determining whether desired system responses to management actions are occurring is often protracted and challenging. For wildlife, the integration of mechanistic habitat modeling with population monitoring may provide expedited measures of management effectiveness and...
A decade of boreal rich fen greenhouse gas fluxes in response to natural and experimental water table variability
David Olefeldt, Eugénie S. Euskirchen, Jennifer W. Harden, Evan S. Kane, A. David McGuire, Mark P. Waldrop, Merritt R. Turetsky
2017, Global Change Biology (23) 2428-2440
Rich fens are common boreal ecosystems with distinct hydrology, biogeochemistry and ecology that influence their carbon (C) balance. We present growing season soil chamber methane emission (FCH4), ecosystem respiration (ER), net ecosystem exchange (NEE) and gross primary production (GPP) fluxes from a 9-years water table manipulation experiment in an Alaskan...
Dynamic oceanography determines fine scale foraging behavior of Masked Boobies in the Gulf of Mexico
Caroline L. Poli, Autumn-Lynn Harrison, Adriana Vallarino, Patrick D. Gerard, Patrick G.R. Jodice
2017, PLoS ONE (12)
During breeding, foraging marine birds are under biological, geographic, and temporal constraints. These contraints require foraging birds to efficiently process environmental cues derived from physical habitat features that occur at nested spatial scales. Mesoscale oceanography in particular may change rapidly within and between breeding seasons, and findings from well-studied systems...
A new mechanistic approach for the further development of a population with established size bimodality
Lisa Heerman, Donald L. DeAngelis, Jost Borcherding
2017, PLoS ONE (12) 1-18
Usually, the origin of a within-cohort bimodal size distribution is assumed to be caused by initial size differences or by one discrete period of accelerated growth for one part of the population. The aim of this study was to determine if more continuous pathways exist allowing shifts from the small...
Linking occupancy surveys with habitat characteristics to estimate abundance and distribution in an endangered cryptic bird
Lisa H. Crampton, Kevin W. Brinck, Kyle E. Pias, Barbara A. P. Heindl, Thomas Savre, Julia S. Diegmann, Eben H. Paxton
2017, Biodiversity and Conservation (26) 1525-1539
Accurate estimates of the distribution and abundance of endangered species are crucial to determine their status and plan recovery options, but such estimates are often difficult to obtain for species with low detection probabilities or that occur in inaccessible habitats. The Puaiohi (Myadestes palmeri) is a cryptic species...
Human infectious disease burdens decrease with urbanization but not with biodiversity
Chelsea L. Wood, Alex McInturff, Hillary S. Young, DoHyung Kim, Kevin D. Lafferty
2017, Philosophical Transactions of the Royal Society B: Biological Sciences (372)
nfectious disease burdens vary from country to country and year to year due to ecological and economic drivers. Recently, Murray et al. (Murray CJ et al. 2012 Lancet 380, 2197–2223. (doi:10.1016/S0140-6736(12)61689-4)) estimated country-level morbidity and mortality associated with a variety of factors, including infectious diseases, for the years...
Scenario Evaluator for Electrical Resistivity survey pre-modeling tool
Neil C. Terry, Frederick D. Day-Lewis, Judith L. Robinson, Lee D. Slater, Keith J. Halford, Andrew Binley, John W. Lane Jr., Dale D. Werkema
2017, Groundwater (55) 885-890
Geophysical tools have much to offer users in environmental, water resource, and geotechnical fields; however, techniques such as electrical resistivity imaging (ERI) are often oversold and/or overinterpreted due to a lack of understanding of the limitations of the techniques, such as the appropriate depth intervals or resolution of the methods....
Water temperature effects from simulated changes to dam operations and structures in the Middle and South Santiam Rivers, Oregon
Norman L. Buccola
2017, Open-File Report 2017-1063
Green Peter and Foster Dams on the Middle and South Santiam Rivers, Oregon, have altered the annual downstream water temperature profile (cycle). Operation of the dams has resulted in cooler summer releases and warmer autumn releases relative to pre-dam conditions, and that alteration can hinder recovery of various life...
Hydrogeologic framework and selected components of the groundwater budget for the upper Umatilla River Basin, Oregon
Nora B. Herrera, Kate Ely, Smita Mehta, Adam J. Stonewall, John C. Risley, Stephen R. Hinkle, Terrence D. Conlon
2017, Scientific Investigations Report 2017-5020
Executive SummaryThis report presents a summary of the hydrogeology of the upper Umatilla River Basin, Oregon, based on characterization of the hydrogeologic framework, horizontal and vertical directions of groundwater flow, trends in groundwater levels, and components of the groundwater budget. The conceptual model of the groundwater flow system integrates available...
