A two-stage step-wise framework for fast optimization of well placement in coalbed methane reservoirs
Jiyuan Zhang, Qihong Feng, Xianmin Zhang, Jia Bai, C. Ozgen Karacan, Derek Elsworth
2020, International Journal of Coal Geology (225)
Coalbed methane (CBM) has emerged as a clean energy resource in the global energy mix, especially in countries such as Australia, China, India and the USA. The economical and successful development of CBM requires a thorough evaluation and optimization of well placement prior to field-scale exploitation. This paper presents a...
The role of seismic and slow slip events in triggering the 2018 M7.1 Anchorage earthquake in the Southcentral Alaska subduction zone
Margarita Segou, Thomas E. Parsons
2020, Geophysical Research Letters (47)
The M 7.1 2018 Anchorage earthquake occurred in the bending part of the subducting North Pacific plate near the geometrical barrier formed by the underthrusting Yakutat terrane. We calculate the triggering potential related with stress redistribution from deformation sources including the M 9.2 1964 earthquake coseismic slip, postseismic deformation, slip from...
Salt flushing, salt storage, and controls on selenium: A 31-year mass-balance analysis of an irrigated, semiarid valley
Carleton R. Bern, Michael J. Holmberg, Zachary D. Kisfalusi
2020, Journal of the American Water Resources Association (56) 647-668
Salinity, selenium, and uranium pose water‐quality challenges for the Arkansas River in southeastern Colorado and other rivers that support irrigation in semiarid regions. This study used 31 years of continuous discharge and specific conductance (SC) monitoring data to assess interannual patterns in water quality using mass balance on a 120‐km reach...
Model selection for the North American Breeding Bird Survey
William A. Link, John R. Sauer, Daniel K Niven
2020, Ecological Applications (30)
The North American Breeding Bird Survey (BBS) provides data that can be used in complex, multiscale analyses of population change, while controlling for scale‐specific nuisance factors. Many alternative models can be fit to the data, but most model selection procedures are not appropriate for hierarchical models. Leave‐one‐out cross‐validation (LOOCV), in...
Variable prey consumption leads to distinct regional differences in Chinook salmon growth during the early marine critical period
Melanie J Davis, Joshua W. Chamberlin, Jennifer R. Gardner, Kristin A. Connelly, Madilyn M. Gamble, Brian R. Beckman, David Beauchamp
2020, Marine Ecology Progress Series (640) 147-169
Growth during the early marine critical period is positively associated with survival and recruitment for Pacific salmon Oncorhynchus spp., so it is important to understand how certain foraging strategies may bolster growth in estuarine and marine environments. To elucidate how spatiotemporal and demographic differences in diet contribute to growth rate variability, we...
Comparing environmental flow implementation options with structured decision making: Case study from the Willamette River, Oregon
J. Tyrell DeWeber, James T. Peterson
2020, Journal of the American Water Resources Association (56) 599-614
Many frameworks have been used to identify environmental flows for sustaining river ecosystems or specific taxa in the face of widespread flow alteration for human use. However, these methods mostly focus on identifying suitable flows and largely ignore the important links between management actions, resulting flows, flow variability, and ecosystem...
Spatiotemporal seismic structure variations associated with the 2018 Kīlauea eruption based on temporary dense geophone arrays
Sin-Mei Wu, Fan-Chi Lin, Jamie Farrell, Brian Shiro, Leif Karlstrom, Paul G. Okubo, Keith D. Koper
2020, Geophysical Research Letters (47)
During the 2018 Kīlauea volcanic eruption, lava erupted from a series of new fissures in the lower East Rift Zone more than 30 km away from the summit through a dike intrusion. Between late May and early August, variations in the effusion rate at the persistent eruptive vent (Fissure 8)...
Climate change causes river network contraction and disconnection in the H.J. Andrews Experimental Forest, Oregon, USA
Adam S Ward, Steven M Wondzell, Noah Schmadel, Skuyler P Herzog
2020, Frontiers in Water (2)
Headwater streams account for more than 89% of global river networks and provide numerous ecosystem services that benefit downstream ecosystems and human water uses. It has been established that changes in climate have shifted the timing and magnitude of observed precipitation, which, at specific gages, have been directly linked...
Holocene relative sea-level change along the tectonically active Chilean coast
Ed Garrett, Daniel Melnick, Tina Dura, Marco Cisternas, Lisa Ely, Robert L. Wesson, Julius Jara-Munoz, Pippa L Whitehouse
2020, Quaternary Science Reviews (236)
We present a comprehensive relative sea-level (RSL) database for north, central, and south-central Chile (18.5°S – 43.6°S) using a consistent, systematic, and internationally comparable approach. Despite its latitudinal extent, this coastline has received little rigorous or systematic attention and details of its RSL history remain largely unexplored. To address this...
Groundwater quality in the Redding–Red Bluff shallow aquifer study unit of the northern Sacramento Valley, California
Jennifer S. Harkness, Jennifer L. Shelton
2020, Fact Sheet 2020-3025
Groundwater provides more than 40 percent of California’s drinking water. To protect this vital resource, the State of California created the Groundwater Ambient Monitoring and Assessment (GAMA) Program. The Priority Basin Project of the GAMA Program provides a comprehensive assessment of the State’s groundwater quality and increases public access to...
Assessment of spatial genetic structure to identify populations at risk for infection of an emerging epizootic disease
William L. Miller, Cassandra M. Miller-Butterworth, Duane R. Diefenbach, W. David Walter
2020, Ecology and Evolution (10) 3977-3990
Understanding the geographic extent and connectivity of wildlife populations can provide important insights into the management of disease outbreaks but defining patterns of population structure is difficult for widely distributed species. Landscape genetic analyses are powerful methods for identifying cryptic structure and movement patterns that may be associated with...
Mitigating land subsidence in the Coachella Valley, California, USA: An emerging success story
Michelle Sneed, Justin T. Brandt
2020, Proceedings of the International Association of Hydrological Sciences (382) 809-813
Groundwater has been a major source of agricultural, municipal, and domestic water supply since the early 1920s in the Coachella Valley, California, USA. Land subsidence, resulting from aquifer-system compaction and groundwater-level declines, has been a concern of the Coachella Valley Water District (CVWD) since the mid-1990s. As a result, the...
Airborne lidar and electro-optical imagery along surface ruptures of the 2019 Ridgecrest earthquake sequence, Southern California
Kenneth W. Hudnut, Benjamin A. Brooks, Katherine M. Scharer, Janis L. Hernandez, Timothy E. Dawson, Michael E. Oskin, J. Ramon Arrowsmith, Christine A. Goulet, Kelly Blake, Matthew A. Boggie, Stephan Bork, Craig L. Glennie, J.C. Fernandez-Diaz, Abhinav Singhania, Darren Hauser, Sven Sorhus
Benjamin A. Brooks, Katherine M. Scharer, Janis Hernandez, Timothy E. Dawson, Mike Oskin, Ramon Arrowsmith, Christine A. Goulet, Kelly Blake, Matt Boggs, Stephan Bork, Craig Glennie, J.C. Fernandez-Diaz, Abhinav Singhania, Darren L. Hauser, Sven Sorhus, editor(s)
2020, Seismological Research Letters (91) 2096-2107
Surface rupture from the 2019 Ridgecrest earthquake sequence, initially associated with the M 6.4 foreshock, occurred on July 4 on a ~17 km long, northeast-southwest oriented, left-lateral zone of faulting. Following the M 7.1 mainshock on July 5 (local time), extensive northwest-southeast-oriented, right-lateral faulting was then also mapped along a...
Carbon sources in the sediments of a restoring vs. historically unaltered salt marsh
Judith Z. Drexler, Melanie J. Davis, Isa Woo, Susan E.W. De La Cruz
2020, Estuaries and Coasts (43) 1345-1360
Salt marshes provide the important ecosystem service of carbon storage in their sediments; however, little is known about the sources of such carbon and whether they differ between historically unaltered and restoring systems. In this study, stable isotope analysis was used to quantify carbon sources in...
Simulated increases in fire activity reinforce shrub conversion in a southwestern US forest
Alisa R. Keyser, Dan J. Krofchek, Cecile C. Remy, Craig D. Allen, Matthew D. Hurteau
2020, Ecosystems (23) 1702-1713
Fire exclusion in historically frequent-fire forests of the southwestern United States has altered forest structure and increased the probability of high-severity fire. Warmer and drier conditions, coupled with dispersal distance limitations, are impeding tree seedling establishment and survival following high-severity fire. High-severity patches are commonly dominated by non-forest vegetation, a...
Detection and measurement of land subsidence and uplift using interferometric synthetic aperture radar, San Diego, California, USA, 2016–2018
Justin T. Brandt, Michelle Sneed, Wesley R. Danskin
2020, Conference Paper, Proceedings of the International Association of Hydrological Sciences
Land subsidence associated with groundwater-level declines is stipulated as an “undesirable effect” in California’s Sustainable Groundwater Management Act (SGMA), and has been identified as a potential issue in San Diego, California, USA. The United States Geological Survey (USGS), the Sweetwater Authority, and the City of San Diego, undertook a cooperative...
The Missoula and Bonneville floods—A review of ice-age megafloods in the Columbia River basin
Jim E. O'Connor, Victor R. Baker, Richard B. Waitt, Larry N Smith, Charles M. Cannon, David L. George, Roger P. Denlinger
2020, Earth-Science Reviews (208)
The Channeled Scabland of eastern Washington State, USA, brought megafloods to the scientific forefront. A 30,000-km2 landscape of coulees and cataracts carved into the region’s loess-covered basalt attests to overwhelming volumes of energetic water. The scarred landscape, garnished by huge boulder bars and far-travelled ice-rafted erratics, spurred J Harlen Bretz’s...
Design and methods of the California stream quality assessment (CSQA), 2017
Jason T. May, Lisa H. Nowell, James F. Coles, Daniel T. Button, Amanda H. Bell, Sharon L. Qi, Peter C. Van Metre
2020, Open-File Report 2020-1023
During 2017, as part of the National Water-Quality Assessment Project, the U.S. Geological Survey conducted the California Stream Quality Assessment to investigate the quality of streams in the Central California Foothills and Coastal Mountains ecoregion, United States. The goal of the California Stream Quality Assessment study was to assess the...
Biogeography and phylogeny of masting: Do global patterns fit functional hypotheses?
Ian S. Pearse, Jalene M. LaMontagne, Michael Lordon, Andrew Hipp, Walter D. Koenig
2020, New Phytologist (227) 1557-1567
1) Interannual variability of seed crops (CVp) has profound consequences for plant populations and food webs, where high CVp is termed ‘masting’. Here we ask: is global variation in CVp better predicted by plant or habitat differences consistent with adaptive economies of scale, in which flower and seed benefits increase...
FiCli, the Fish and Climate Change Database, informs climate adaptation and management for freshwater fishes
Trevor J. Krabbenhoft, Bonnie Jean Evaline Myers, Jesse Wong, Cindy Chu, Ralph W. Tingley, Jeffrey A. Falke, Thomas J. Kwak, Craig P. Paukert, Abigail Lynch
2020, Scientific Data (7)
Inland fishes provide important ecosystem services to communities worldwide and are especially vulnerable to the impacts of climate change. Fish respond to climate change in diverse and nuanced ways, which creates challenges for practitioners of fish conservation, climate change adaptation, and management. Although climate change is...
Post-fire management-scale trials of bacterial soil amendment MB906 show inconsistent control of invasive annual grasses
Brynne E. Lazarus, Matthew Germino, Martha Brabec, Logan Peterson, Ryan N Walker, Ann Moser
2020, Rangeland Ecology and Management (73) 741-748
Rangeland managers need tools to control invasive annual grasses, particularly following wildfire. We assessed responses of native and invasive/exotic grasses to the MB906 soil amendment containing live cultures of a purportedly weed-suppressive strain of the bacterium Pseudomonas fluorescens (“WSB”). MB906 was applied alone and...
Mapping perceived social values to support a respondent-defined restoration economy: Case study in southeastern Arizona, USA
Roy E. Petrakis, Laura M. Norman, Oliver Lysaght, Benson C. Sherrouse, Darius J. Semmens, Kenneth J. Bagstad, Richard Pritzlaff
Oliver Lysaght, Benson C. Sherrouse, Darius J. Semmens, Kenneth J. Bagstad, Richard Pritzlaff, editor(s)
2020, Air, Soil and Water Research (13)
Investment in conservation and ecological restoration depends on various socioeconomic factors and the social license for these activities. Our study demonstrates a method for targeting management of ecosystem services based on social values, identified by respondents through a collection of social survey data. We applied the Social Values for Ecosystem...
Understanding sportsperson retention and reactivation through license purchasing behavior
M.P. Hinrichs, Nathaniel B. Price, M.P. Gruntorad, Kevin L. Pope, Joseph J. Fontaine, C. J. Chizinski
2020, Wildlife Society Bulletin (44) 383-390
Most state and provincial fish and wildlife agencies have access to important information about patterns in sportsperson participation through their license databases. Using transaction data from Nebraska Game and Parks Commission's electronic hunting and fishing license system, we tracked license purchases of Nebraska, USA, resident license...
Biological control of Aedes mosquito larvae with carnivorous aquatic plant, Utricularia macrorhiza
Jannelle Couret, Marco Notarangelo, Sarashwathi Veera, Noah LeClaire-Conway, Howard S. Ginsberg, Roger A. LeBrun
2020, Parasites & Vectors (13)
BackgroundBiological controls with predators of larval mosquito vectors have historically focused almost exclusively on insectivorous animals, with few studies examining predatory plants as potential larvacidal agents. In this study, we experimentally evaluate a generalist plant predator of North America, Utricularia macrorhiza, the common bladderwort, and evaluate its larvacidal efficiency for...
Novel insights into serodiagnosis and epidemiology of Erysipelothrix rhusiopathiae, a newly recognized pathogen in muskoxen (Ovibos moschatus)
F. Mavrot, K. Orsel, W. Hutchins, Layne G. Adams, K. Beckmen, J. Blake, S. Checkley, T. Davison, J. Di Francesco, B. Elkin, L. Leclerc, A. Schneider, M. Tomaselli, S. Kutz
2020, PLoS ONE (15)
Muskoxen are a key species of Arctic ecosystems and are important for food security and socio-economic well-being of many Indigenous communities in the Arctic and Subarctic. Between 2009 and 2014, the bacterium Erysipelothrix rhusiopathiae was isolated for the first time in this species in association with multiple mortality events in Canada and Alaska, raising...
