Complexity of groundwater age mixing near a seawater intrusion zone based on multiple tracers and Bayesian inference
YeoJin Ju, Arash Massoudieh, Christopher Green, Kang-Kun Lee, Dugin Kaown
2021, Science of the Total Environment (753)
Aquifer flow systems near seawater interfaces can be complicated by density-driven flows and the formation of stagnation zones, which inevitably introduces uncertainty into groundwater age-dating. While age-dating has proved effective to understand the seawater intrusion and aquifer salinization process in coastal aquifers, further efforts...
Quantifying model structural uncertainty using airborne electromagnetic data
Burke J. Minsley, N. Leon Foks, Paul A. Bedrosian
2021, Geophysical Journal International (224) 590-607
The ability to quantify structural uncertainty in geological models that incorporate geophysical data is affected by two primary sources of uncertainty: geophysical parameter uncertainty and uncertainty in the relationship between geophysical parameters and geological properties of interest. Here, we introduce an open-source, trans-dimensional Bayesian Markov chain Monte Carlo (McMC) algorithm...
Environmental gradients of selection for an alpine-obligate bird, the white-tailed ptarmigan (Lagopus leucura)
Shawna J Zimmerman, Cameron L. Aldridge, Kathryn M. Langin, Gregory T Wann, Robert S. Cornman, Sara J. Oyler-McCance
2021, Heredity (126) 117-131
The warming climate will expose alpine species adapted to a highly seasonal, harsh environment to novel environmental conditions. A species can shift their distribution, acclimate, or adapt in response to a new climate. Alpine species have little suitable habitat to shift their distribution, and the limits of acclimation will likely...
Assessing the assumptions of classification agreement, accuracy, and predictable healing time of sea lamprey wounds on lake trout
Tyler Firkus, Cheryl Murphy, Jean V. Adams, Ted Treska, Gregory J. Fischer
2021, Journal of Great Lakes Research (47) S368-S377
Sea lamprey control in the Laurentian Great Lakes relies on records of sea lamprey wounds on lake trout to assess whether control efforts are supporting fisheries management targets. Wounding records have been maintained for 70 years under the assumption that they are a reliable and accurate reflection of sea lamprey damage...
Elemental and radionuclide exposures and uptakes by small rodents, invertebrates, and vegetation at active and post-production uranium mines in the Grand Canyon watershed
Danielle M. Cleveland, Jo Ellen Hinck, Julia S. Lankton
2021, Chemosphere (263)
The effects of breccia pipe uranium mining in the Grand Canyon watershed (Arizona) on ecological and cultural resources are largely unknown. We characterized the exposure of biota to uranium and co-occurring ore body elements during active ore production and at a site where ore production had recently concluded. Our results...
Integrating the evidence for a terrestrial carbon sink caused by increasing atmospheric CO2
Anthony P. Walker, Martin G De Kauwe, Ana Bastos, Soumaya Belmecheri, Katerina Georgiou, Ralph F. Keeling, Sean M. McMahon, Belinda E. Medlyn, David J P Moore, Richard J. Norby, Sonke Zaehle, Kristina J. Anderson-Teixeira, Giovanna Battipaglia, Roel J W Brienen, Kristine G Cabugao, Maxime Cailleret, Elliott Campbell, Josep G Canadell, Philippe Ciais, Matthew E Craig, David S Ellsworth, Graham D Farquhar, Simone Fatichi, Joshua B. Fisher, David C Frank, Heather Graven, Lianhong Gu, Vanessa Haverd, Kelly A Heilman, Martin Heimann, Bruce A Hungate, Colleen M. Iverson, Fortunat Joos, Mingkai Jiang, Trevor F. Keenan, Jurgen Knauer, Christian Korner, Victor O Leshyk, Sebastian Leuzinger, Yao Liu, Natasha MacBean, Yadvinder Malhi, Tim R McVicar, Josep Penuelas, Julia Pongratz, A Shafer Powell, Terhi Riutta, Manon E B Sabot, Juergen Schleucher, Stephen Sitch, William K. Smith, Benjamin N. Sulman, Benton Taylor, Cesar Terrer, Margaret S. Torn, Kathleen K Treseder, Anna T Trugman, Susan E. Trumbore, Phillip J. van Mantgem, Steve L Voelker, Mary E Whelan, Peiter A Zuidema.
2021, New Phytologist (229) 2413-2445
Atmospheric carbon dioxide concentration ([CO2]) is increasing, which increases leaf‐scale photosynthesis and intrinsic water‐use efficiency. These direct responses have the potential to increase plant growth, vegetation biomass, and soil organic matter; transferring carbon from the atmosphere into terrestrial ecosystems (a carbon sink). A substantial global terrestrial carbon sink would slow...
Forest density intensifies the importance of snowpack to growth in water-limited pine forests
Kelly Erika Gleason, John B. Bradford, Anthony W. D’Amato, Shawn Fraver, Brian J. Palik, Michael A. Battaglia
2021, Ecological Applications (31)
Warming climate and resulting declines in seasonal snowpack have been associated with drought stress and tree mortality in seasonally snow‐covered watersheds worldwide. Meanwhile, increasing forest density has further exacerbated drought stress due to intensified tree‐tree competition. Using a uniquely detailed dataset of population‐level forest growth (n=2495 sampled trees), we examined...
Identifying sources and year classes contributing to invasive grass carp in the Laurentian Great Lakes
Gregory W. Whitledge, Duane Chapman, John Farver, Seth Herbst, Nicholas E. Mandrak, Jeffrey G. Miner, Kevin L. Pangle, Patrick Kocovsky
2021, Journal of Great Lakes Research (47) 14-28
Relative contributions of aquaculture-origin and naturally-reproduced grass carp (Ctenopharyngodon idella) in the Laurentian Great Lakes have been unknown. We assessed occurrence and distribution of aquaculture-origin and wild grass carp in the Great Lakes using ploidy and otolith stable oxygen isotope (δ18O) data. We inferred natal river and dispersal from natal...
Lake trout growth is sensitive to spring temperature in southwest Alaska lakes
Vanessa R. von Biela, Bryan A. Black, Daniel Young, Peter van der Sleen, Krista K. Bartz, Christian E. Zimmerman
2021, Ecology of Freshwater Fish (30) 88-99
In high‐latitude lakes, air temperature is an important driver of ice cover thickness and duration, which in turn influence water temperature and primary production supporting lake consumers and predators. In lieu of multidecadal observational records necessary to assess the response of lakes to long‐term warming, we used otolith‐based growth records...
Trapping of suspended sediment by submerged aquatic vegetation in a tidal freshwater region: Field observations and long-term trends
Paul A. Work, Maureen A. Downing-Kunz, Judith Z. Drexler
2021, Estuaries and Coasts (44) 734-739
Widespread invasion by non-native, submerged aquatic vegetation (SAV) may modify the sediment budget of an estuary, reducing the availability of inorganic sediment required by marshes to maintain their position in the tidal frame. The instantaneous trapping rate of suspended sediment in SAV patches in an estuary has not previously been...
Interpreting and reporting 40Ar/39Ar geochronologic data
Allen J. Schaen, Brian R. Jicha, Kip V. Hodges, Pieter Vermeesch, Mark E. Stelten, Cameron M. Mercer, David Phillips, Tiffany Rivera, Fred Jourdan, Erin L. Matchan, Sidney R. Hemming, Leah E. Morgan, Simon P. Kelley, William S. Cassata, Matt T. Heizler, Paulo M. Vasconcelos, Jeff A. Benowitz, Anthony A.P. Koppers, Darren F. Mark, Elizabeth M. Niespolo, Courtney J. Sprain, William E. Hames, Klaudia F. Kuiper, Brent D. Turrin, Paul R. Renne, Jake Ross, Sebastian Nomade, Herve Guillou, Laura E. Webb, Barbara A. Cohen, Andrew T. Calvert, Nancy Joyce, Morgan Ganderod, Jan Wijbrans, Osamu Ishizuka, Huaiyu He, Adan Ramirez, Jorg Pfander, Margarita Lopez-Martinez, Huaning Qiu, Brad S. Singer
2021, GSA Bulletin (133) 461-487
The 40Ar/39Ar dating method is among the most versatile of geochronometers, having the potential to date a broad variety of K-bearing materials spanning from the time of Earth’s formation into the historical realm. Measurements using modern noble-gas mass spectrometers are now producing 40Ar/39Ar dates with analytical uncertainties of ∼0.1%, thereby...
A Lagrangian particle-tracking approach to modelling larval drift in rivers
Richard R. McDonald, Jonathan M. Nelson
2021, Journal of Ecohydraulics (6) 17-35
The migration of larval fish from spawning to rearing habitat in rivers is not well understood. This paper describes a methodology to predict larval drift using a Lagrangian particle-tracking (LPT) model with passive and active behavioural components loosely coupled to a quasi-three-dimensional hydraulic model. In the absence of measured larval...
Quantifying and mapping inundation regimes within a large river‐floodplain ecosystem for ecological and management applications
Molly Van Appledorn, Nathan R. De Jager, Jason J. Rohweder
2021, River Research and Applications (37) 241-255
Spatial information on the distribution of ecosystem patterns and processes can be a critical component of designing and implementing effective management programs in river‐floodplain ecosystems. For example, translating how flood pulses detected within a stream gauge record are spatially manifested across a river‐valley bottom can be used to evaluate whether...
Carbon stock losses and recovery observed for a mangrove ecosystem following a major hurricane in Southwest Florida
Elitsa I. Peneva-Reed, Ken Krauss, Eric L. Bullock, Zhiliang Zhu, Victoria Woltz, Judith Z. Drexler, Jeremy R. Conrad, Stephen V. Stehman
2021, Estuarine, Coastal and Shelf Science (248)
Studies integrating mangrove in-situ observations and remote sensing analysis for specific sites often lack precise estimates of carbon stocks over time frames that include disturbance events. This study quantifies change in mangrove area from 1985 to 2018 with Landsat time series analysis, estimates above and belowground stored carbon using field data, and...
Fish diversity, endemism, threats, and conservation in the Jinsha River basin (upper Yangtze River), China
H. W. Liu, C. Guo, X. Qu, F. Xiong, Craig P. Paukert, Y. Chen, W. Sullivan
2021, North American Journal of Fisheries Management (41) 967-984
The Jinsha River, which comprises the upper reaches of the Yangtze River, has among the highest freshwater fish biodiversity and endemism in China, but these characteristics have rarely been quantitatively evaluated at the basin scale. We used fish presence–absence data collected from the entire Jinsha River basin (JRB) from 1964...
Units recovery methods in compositional data analysis
J. A Martin-Fernandez, Juan Jose Egozcue, Ricardo A. Olea, Vera Pawlowsky-Glahn
2021, Natural Resources Research (30) 3045-3058
Compositional data carry relative information. Hence, their statistical analysis has to be performed on coordinates with respect to a log-ratio basis. Frequently, the modeler is required to back-transform the estimates obtained with the modeling to have them in the original units such as euros, kg or...
Effects of latitude, season, and temperature on Lake Sturgeon movement
Michael J. Moore, Craig P. Paukert, T. Moore
2021, North American Journal of Fisheries Management (41) 916-928
Ecologists have a limited understanding of the rangewide variation in movement behavior in freshwater fishes, but recent expansion of biotelemetry allows biologists to investigate how fish movement can help to predict behavioral shifts in response to changing environments. The Lake Sturgeon Acipenser fulvescens is a wide-ranging, migratory, coolwater species, making it a...
Limitations, lack of standardization, and recommended best practices in studies of renewable energy effects on birds and bats
Tara Conkling, S. R. Loss, James E. Diffendorfer, A. Duerr, Todd E. Katzner
2021, Conservation Biology (35) 64-76
Increasing global energy demand is fostering the development of renewable energy as an alternative to fossil fuels. However, renewable energy facilities may adversely affect wildlife. Facility siting guidelines recommend or require project developers complete pre‐ and postconstruction wildlife surveys to predict risk and estimate effects of proposed projects. Despite this,...
Making Recursive Bayesian inference accessible
Mevin Hooten, Devin S. Johnson, Brian M. Brost
2021, American Statistician (75) 185-194
Bayesian models provide recursive inference naturally because they can formally reconcile new data and existing scientific information. However, popular use of Bayesian methods often avoids priors that are based on exact posterior distributions resulting from former studies. Two existing Recursive Bayesian methods are: Prior- and Proposal-Recursive Bayes. Prior-Recursive Bayes uses Bayesian updating, fitting...
Selenium, mercury, and their molar ratios in sportfishes from drinking water reservoirs
Tara K. B. Johnson, C. E. LePrevost, Thomas J. Kwak, W. G. Cope
2021, International Journal of Environmental Research and Public Health (15)
Mercury (Hg) bioaccumulates in aquatic ecosystems and may pose a risk to humans who consume fish. Selenium (Se) has the ability to reduce Hg toxicity, but the current guidance for human consumption of fish is based on Hg concentration alone. The purpose of the present study was to examine the...
Perspectives on the paleolimnology of the late Eocene Florissant lake from diatom and sedimentary evidence at Clare’s Quarry, Teller County, Colorado, USA
Mary Ellen Benson, Dena M. Smith, Sarah A. Spaulding
2021, Book chapter, From saline to freshwater: The diversity of western lakes in space and time
The late Eocene Florissant Formation in central Colorado is a rich and diverse continental Lagerstätte yielding well-preserved fossil assemblages from lacustrine and fluvial facies. This investigation focused on the lacustrine facies at Clare’s Quarry and used biotic and abiotic evidence to characterize aspects of the lake and processes that resulted...
Model structural uncertainty quantification and hydrogeophysical data integration using airborne electromagnetic data
Burke J. Minsley, Nikolaj K Christensen, Steen Christensen, Yusen Ley-Cooper
2021, Conference Paper
Airborne electromagnetic (AEM) dataare usedto estimate large-scale model structural geometry, i.e. the spatial distribution of different lithological units based on assumed or estimated resistivity-lithology relationships, and the uncertainty in those structures given imperfect measurements. Geophysically derived estimates of model structural uncertainty are then combined with hydrologic observations to assess the...
Streamflow, sediment transport, and geomorphic change during the 2011 flood on the Missouri River near Bismarck-Mandan, ND
Rochelle A. Nustad, Adam J. Benthem, Katherine Skalak, Richard R. McDonald, Edward R. Schenk, Joel M. Galloway
2021, JAWRA (54) 1151-1167
Geomorphic change from extreme events in large managed rivers has implications for river management. A steady-state, quasi-three-dimensional hydrodynamic model was applied to a 29-km reach of the Missouri River using 2011 flood data. Model results for an extreme flow (500-year recurrence interval [RI]) and an elevated managed flow (75-year RI)...
Statistical implementations of agent-based demographic models
Mevin Hooten, Christopher K. Wikle, Michael R. Schwob
2020, International Statistical Review (88) 441-461
A variety of demographic statistical models exist for studying population dynamics when individuals can be tracked over time. In cases where data are missing due to imperfect detection of individuals, the associated measurement error can be accommodated under certain study designs (e.g., those that involve multiple surveys or replication). However, the interaction of...
A new approach to the study of relationship quality in dolphins: framework and preliminary results
Manon Themelin, Christine Ribic, Kel Melillo-Sweeting, Teri Bolton, Kathleen M. Dudzinski
2020, Behavioural Processes (181)
Proximity and synchronous behaviours from surface observations have been used to measure association patterns within and between dolphin dyads. To facilitate an investigation of relationship quality in dolphins, we applied a method used for chimpanzees and ravens that examined three main components to describe relationships: value, security, and compatibility. Using...
