Evaluating the dynamics of groundwater, lakebed transport, nutrient inflow and algal blooms in Upper Klamath Lake, Oregon, USA
Hedeff I. Essaid, James S. Kuwabara, Nicholas Corson-Dosch, James L. Carter, Brent R. Topping
2021, Science of the Total Environment (765)
Transport of nutrients to lakes can occur via surface-water inflow, atmospheric deposition, groundwater (GW) inflow and benthic processes. Identifying and quantifying within-lake nutrient sources and recycling processes is challenging. Prior studies in hypereutrophic Upper Klamath Lake, Oregon, USA, indicated that ~60% of the early summer phosphorus (P) load to the...
VS30 and Dominant Site Frequency (fd) as Provisional Station ML Corrections (dML) in California
Alan Yong, Elizabeth S. Cochran, Jennifer Andrews, Kenneth Hudson, Ellen Yu, Antony Martin, Julie A. Herrick, Jessica Dozal
2021, Bulletin of the Seismological Society of America (111) 61-76
New seismic stations added to a regional seismic network cannot be used to calculate local magnitude (ML">ML) until a revised regionwide amplitude decay function is developed. Each station must record a minimum...
Free-roaming horses disrupt greater sage-grouse lekking activity in the Great Basin
Diana A. Munoz, Peter S. Coates, Mark A. Ricca
2021, Journal of Arid Environments (184)
Greater Sage-Grouse (Centrocercus urophasianus; hereafter, sage-grouse) and free-roaming horses (Equus caballus) co-occur within large portions of sagebrush ecosystems within the Great Basin of western North America. In recent decades, sage-grouse populations have declined substantially while concomitant free-roaming horse populations have increased drastically....
Simulating strategic implementation of the CRP to increase Greater prairie-chicken abundance
Kalysta Adkins, Charlotte L. Roy, Robert G. Wright, David E. Andersen
2021, Journal of Wildlife Management (85) 27-40
The Conservation Reserve Program (CRP) has the potential to influence the distribution and abundance of grasslands in many agricultural landscapes, and thereby provide habitat for grassland-dependent wildlife. Greater prairie-chickens (Tympanuchus cupido pinnatus) are a grassland-dependent species with large area requirements and have been used as an indicator of grassland ecosystem...
Behavioural response of sea lamprey (Petromyzon marinus) to acoustic stimuli in a small stream
Victoria Heath, Scott M. Miehls, Nicholas S. Johnson, Dennis Higgs
2021, Canadian Journal of Fisheries and Aquatic Sciences (78) 341-348
Sea lamprey (Petromyzon marinus) are invasive in the Laurentian Great Lakes and parasitically feed on valued fishes. Migration barriers and selective pesticides are used to control sea lamprey, but there is a desire to develop additional control tools such as traps with nonphysical deterrents. Sound has been used as a...
A checklist for crisis operations within volcano observatories
Christopher Newhall, John S. Pallister, C. Dan Miller
2021, Book chapter, Forecasting and planning for volcanic hazards, Risks, and disasters
We draw on our experience in assisting with international crises through the volcano disaster assistance program (VDAP) and during the eruptions of Mount St. Helens in 1980–1986 and 2004–2008 to offer recommendations for successful observatory operations during times of crisis. The degree of success in responding to a...
Volcano geodesy: A critical tool for assessing the state of volcanoes and their potential for hazardous eruptive activity
Michael Poland, Elske de Zeeuw-van Dalfsen
2021, Book chapter, Forecasting and planning for volcanic hazards, risks, and disasters
Since the beginning of the 20th century, volcano geodesy has evolved from time- and personnel-intensive methods for collecting discrete measurements to automated and/or remote tools that provide data with exceptional spatiotemporal resolution. By acknowledging and overcoming limitations related to data collection and interpretation, geodesy becomes a powerful tool for forecasting...
Harnessing landscape genomics to identify future climate resilient genotypes in a desert annual
Daniel F. Shryock, Loraine K Washburn, Lesley A. DeFalco, Todd Esque
2021, Molecular Ecology (30) 698-717
Local adaptation features critically in shaping species responses to changing environments, complicating efforts to revegetate degraded areas. Rapid climate change poses an additional challenge that could reduce fitness of even locally sourced seeds in restoration. Predictive restoration strategies that apply seeds with favourable adaptations to future climate may promote long‐term...
Variation of lead isotopic composition and atomic weight in terrestrial materials (IUPAC Technical Report)
Xiang-Kun Zhu, Jacqueline Benefield, Tyler B. Coplen, Zhaofu Gao, Norman E. Holden
2021, Pure and Applied Chemistry (93) 155-166
The isotopic composition and atomic weight of lead are variable in terrestrial materials because its three heaviest stable isotopes are stable end-products of the radioactive decay of uranium (238U to 206Pb; 235U to 207Pb) and thorium (232Th to 208Pb). The lightest stable isotope, 204Pb, is primordial. These variations in isotope...
Changes in ecosystem nitrogen and carbon allocation with black mangrove (Avicennia germinans) encroachment into Spartina alterniflora salt marsh
Aaron Macy, Michael Osland, Julia A Cherry, Just Cebrian
2021, Ecosystems (24) 1007-1023
Increases in temperature are expected to facilitate encroachment of tropical mangrove forests into temperate salt marshes, yet the effects on ecosystem services are understudied. Our work was conducted along a mangrove expansion front in Louisiana (USA), an area where coastal wetlands are in rapid decline due...
Evaluating the effects of downscaled climate projections on groundwater storage and simulated base-flow contribution to the North Fork Red River and Lake Altus, southwest Oklahoma (USA)
L.G. Labriola, J.H. Ellis, Subhrendu Gangopadhyay, Tom Pruitt, Pierre Kirstetter, Yang Hong
2021, Hydrogeology Journal (28) 2903-2916
Potential effects of projected climate variability on base flow and groundwater storage in the North Fork Red River aquifer, Oklahoma (USA), were estimated using downscaled climate model data coupled with a numerical groundwater-flow model. The North Fork Red River aquifer discharges groundwater to the North Fork Red River, which provides...
Direct and indirect effects of a keystone engineer on a shrubland-prairie food web
Courtney J. Duchardt, Lauren M. Porensky, Ian S. Pearse
2021, Ecology (102)
Keystone engineers are critical drivers of biodiversity throughout ecosystems worldwide. Within the North American Great Plains, the black‐tailed prairie dog is an imperiled ecosystem engineer and keystone species with well‐documented impacts on the flora and fauna of rangeland systems. However, because this species affects ecosystem structure and function in myriad...
Select techniques for detecting and quantifying seepage from unlined canals
Evan J. Lindenbach, Jong Beom Kang, Justin B. Rittgers, Ramon C. Naranjo
2021, Final Report ST-2020-19144-01
Canal seepage losses affect the ability of water conveyance structures to maximize efficiency and can be a precursor to canal failure. Identification and quantification of canal seepage out of unlined canals is a complex interaction affected by geology, canal stage, operations, embankment geometry, siltation, animal burrows, structures, and other physical...
A multiproxy database of western North American Holocene paleoclimate records
Cody C. Routson, Darrell S. Kaufman, Nicholas P. McKay, Michael Erb, S. H. Arcusa, Kendrick Brown, Matthew E. Kirby, Jeremiah Marsicek, R. Scott Anderson, Gonzalo Jimenez-Moreno, Jessica R. Rodysill, M. S. Lachniet, Sherilyn C. Fritz, Joseph Bennett, Michelle F. Goman, Sarah E. Metcalfe, J. M. Galloway, G. Schoups, David Wahl, Jesse L. Morris, F. Staines-Urias, A. Dawson, B. N. Shuman, Daniel G. Gavin, Jeffrey S. Munroe, Brian F. Cumming
2021, Earth System Science Data (13) 1613-1632
Holocene climate reconstructions are useful for understanding the diverse features and spatial heterogeneity of past and future climate change. Here we present a database of western North American Holocene paleoclimate records. The database gathers paleoclimate time series from 184 terrestrial and marine sites, including 381 individual proxy records. The records...
Moderate susceptibility to subcutaneous plague (Yersinia pestis) challenge in vaccine-treated and untreated Sonoran deer mice (Peromyscus maniculatus sonoriensis) and northern grasshopper mice (Onychomys leucogaster)
Gebbiena Bron, Susan Smith, Judy L. Williamson, Daniel W. Tripp, Tonie E. Rocke
2021, Journal of Wildlife Diseases (57) 632-636
The variable response of wild mice to Yersinia pestis infection, the causative agent of plague, has generated much speculation concerning their role in the ecology of this potentially lethal disease. Researchers have questioned the means by which Y. pestis is maintained in nature and also sought methods for managing the disease. Here we assessed...
The influence of legacy contamination on the transport and bioaccumulation of mercury within the Mobile River Basin
Sarah E. Janssen, Michael T. Tate, David P. Krabbenhoft, John F. DeWild, Jacob M. Ogorek, Christopher L. Babiarz, Anthony Sowers, Peter L. Tuttle
2021, Journal of Hazardous Materials (404)
Past industrial use and subsequent release of mercury (Hg) into the environment have resulted in severe cases of legacy contamination that still influence contemporary Hg levels in biota. While the bioaccumulation of legacy Hg is commonly assessed via concentration measurements within fish tissue, this practice...
Elucidating controls on cyanobacteria bloom timing and intensity via Bayesian mechanistic modeling
Dario Del Giudice, Shiqi Fang, Donald Scavia, Timothy W. Davis, Mary Anne Evans, Daniel R Obenour
2021, Science of the Total Environment (755)
The adverse impacts of harmful algal blooms (HABs) are increasing worldwide. Lake Erie is a North American Great Lake highly affected by cultural eutrophication and summer cyanobacterial HABs. While phosphorus loading is a known driver of bloom size, more nuanced yet crucial questions remain. For...
Negative effects of an allelopathic invader on AM fungal plant species drive community‐level responses
Morgan Roche, Ian Pearse, Lalasia Bialic-Murphy, Stephanie N Kivlin, Helen Sofaer, Susan Kalisz
2021, Ecology (102)
The mechanisms causing invasive species impact are rarely empirically tested, limiting our ability to understand and predict subsequent changes in invaded plant communities. Invader disruption of native mutualistic interactions is a mechanism expected to have negative effects on native plant species. Specifically, disruption of native plant‐fungal mutualisms may provide non‐mycorrhizal...
Leveraging deep learning in global 24/7 real-time earthquake monitoring at the National Earthquake Information Center
William L. Yeck, John Patton, Zachary E. Ross, Gavin P. Hayes, Michelle M. Guy, Nicholas Ambruz, David R. Shelly, Harley M. Benz, Paul S. Earle
2021, Seismological Research Letters (92) 4469-480
Machine‐learning algorithms continue to show promise in their application to seismic processing. The U.S. Geological Survey National Earthquake Information Center (NEIC) is exploring the adoption of these tools to aid in simultaneous local, regional, and global real‐time earthquake monitoring. As a first step, we describe a simple framework to incorporate...
Multidecadal comparison of Red-footed Booby Sula sula diet at Ulupa'u Crater, O'ahu, Hawai'i
Sarah E. Donahue, Josh Adams, K David Hyrenbach
2021, Marine Onithology (49) 51-55
We describe the diet of Red-footed Boobies Sula sula nesting at Ulupaʻu Crater, Oʻahu, Hawaiʻi based on 106 regurgitations collected during 2014 and 2015. We also compare our results to a diet study at this colony five decades earlier. Both studies indicate that flying squid (Ommastrephidae) and flyingfish (Exocoetidae) are...
Seasonality of acarological risk of exposure to Borrelia miyamotoi from questing life stages of Ixodes scapularis collected from Wisconsin and Massachusetts, USA
Seungeun Han, Graham J. Hickling, Nicholas H. Ogden, Howard S. Ginsberg, Vishvapali Kobbekaduwa, Eric L. Rulison, Lorenza Beati, Jean I. Tsao
2021, Ticks and Tick-borne Diseases (12)
Measures of acarological risk of exposure to Ixodes scapularis-borne disease agents typically focus on nymphs; however, the relapsing fever group spirochete, Borrelia miyamotoi can be transmitted transovarially, and I. scapularis larvae are capable of transmitting B. miyamotoi to their hosts. To quantify the larval contribution to acarological risk, relative to nymphs and adults, we collected questing I. scapularis for...
Genetic analysis of the diet of red‐footed boobies (Sula sula) provisioning chicks at Ulupa'u Crater, O'ahu
Sarah E. Donahue, Josh Adams, Mark A Renshaw, K David Hyrenbach
2021, Aquatic Conservation: Marine and Freshwater Ecosystems (31) 324-339
The diet of red‐footed boobies (Sula sula) provisioning chicks was quantified using 106 regurgitations collected from 81 adults over two study years with contrasting oceanographic conditions: 2014 and 2015.A total of 1,049 prey items were sorted into three broad categories (fish, squid, and other, consisting of highly‐digested ‘mush’ and...
Net-spinning caddisfly distribution in large regulated rivers
Anya Metcalfe, Jeffrey Muehlbauer, Theodore Kennedy, Charles Yackulic, Kimberly L. Dibble, Jane C. Marks
2021, Freshwater Biology (66) 89-101
Most of the world's large rivers are dammed for the purposes of water storage, flood control, and power production. Damming rivers fundamentally alters water temperature and flows in tailwater ecosystems, which in turn affects the presence and abundance of downstream biota.We collaborated with more than 200 citizen scientists to...
Trends in nitrogen, phosphorus, and sediment concentrations and loads in streams draining to Lake Tahoe, California, Nevada, USA
Joseph L. Domagalski, Eric D. Morway, Nancy L. Alvarez, Juliet Hutchins, Michael R. Rosen, Robert Coats
2021, Science of the Total Environment (STOTEN) (752)
Lake Tahoe, a large freshwater lake of the eastern Sierra Nevada in California and Nevada, has 63 tributaries that are sources of nutrients and sediment to the lake. The Tahoe watershed is relatively small, and the surface area of the lake occupies about 38% of the watershed area (1313 km2). Only...
An integrative ecological drought framework to span plant stress to ecosystem transformation
Seth M. Munson, John B. Bradford, Kevin R. Hultine
2021, Ecosystems (24) 739-754
Droughts have increased globally in the twenty-first century and are expected to become more extreme and widespread in the future. Assessments of how drought affects plants and ecosystems lack consistency in scope and methodology, confounding efforts to mechanistically interpret structural and functional impacts and predict future transformations under climate change....
