Nonlinear patterns in mercury bioaccumulation in American alligators are a function of predicted age
A.J. Lawson, Clinton T. Moore, T.R. Rainwater, F.M. Nilsen, P.M. Wilkinson, R.H. Lowers, L.J. Jr Guillett, Katherine W. McFadden, Patrick G.R. Jodice
2020, Science of the Total Environment (707)
Mercury is a widespread, naturally occurring contaminant that biomagnifies in wetlands due to the methylation of this element by sulfate-reducing bacteria. Species that feed at the top <a class="topic-link" title="Learn more about trophic level from...
Ground-motion amplification in Cook Inlet region, Alaska from intermediate-depth earthquakes, including the 2018 MW=7.1 Anchorage earthquake
Morgan P. Moschetti, Eric M. Thompson, John Rekoske, Mike Hearne, Peter M. Powers, Daniel E. McNamara, Carl Tape
2020, Seismological Research Letters (91) 142-152
We measure pseudospectral and peak ground motions from 44 intermediate‐depth Mw≥4.9">Mw≥4.9 earthquakes in the Cook Inlet region of southern Alaska, including those from the 2018 <span id="MathJax-Element-4-Frame"...
The sedimentary record of the 2018 Anchorage Earthquake in Eklutna Lake, Alaska: Calibrating the lacustrine seismograph
Maarten Van Daele, Peter J. Haeussler, Robert C. Witter, Nore Praet, Marc De Batist
2020, Seismological Research Letters (91) 126-141
The 30 November 2018 Mw">MMw">w 7.1 Anchorage earthquake caused modified Mercalli intensities of V¼ to V½ at Eklutna Lake...
Occupancy patterns in a reintroduced fisher population during reestablishment
Patricia J. Happe, Kurt Jenkins, Rebecca M. McCaffery, J. C. Lewis, Kristine Pilgrim, Michael K. Schwartz
2020, Journal of Wildlife Management (84) 344-358
Monitoring population performance in the years following species reintroductions is key to assessing population restoration success and evaluating assumptions made in planning species restoration programs. From 2008–2010 we translocated 90 fishers (Pekania pennanti) from British Columbia, Canada, to Washington's Olympic Peninsula, USA, providing the opportunity to...
Hydrologic resilience from summertime fog and recharge: A case study for coho salmon recovery planning
Alicia A. Torregrosa, Lorraine E. Flint, Alan L. Flint
2020, Journal of the American Water Resources Association (56) 134-160
Fog and low cloud cover (FLCC) and late summer recharge increase stream baseflow and decrease stream temperature during arid Mediterranean climate summers, which benefits salmon especially under climate warming conditions. The potential to discharge cool water to streams during the late summer (hydrologic capacity; HC) furnished by FLCC and recharge...
Could a freshwater fish be at the root of dystrophic crises in a coastal lagoon?
Marco Milardi, Elisa Soana, Duane Chapman, Elisa Anna Fano, Giuseppe Castaldelli
2020, Science of the Total Environment (711)
Eutrophication has a profound impact on ecosystems worldwide. Grass carp Ctenopharyngodon idella, an herbivorous fish, has been introduced to control aquatic plant overgrowth caused by eutrophication, but could have other, potentially detrimental, effects. We used the Po di Volano basin (south of the Po River...
Relaxing segmentation on the Wasatch Fault Zone: Impact on seismic hazard
Alessandro Valentini, Christopher DuRoss, Edward H. Field, Ryan D. Gold, Richard W. Briggs, Francesco Visini, Bruno Pace
2020, Bulletin of the Seismological Society of America (110) 83-109
The multisegment Wasatch fault zone is a well-studied normal fault in the western United States that has paleoseismic evidence of recurrent Holocene surface-faulting earthquakes. Along the 270-km-long central part of the fault, four primary structural complexities provide possible along-strike limits to these ruptures and form the basis for models of...
Using integrated population models for insights into monitoring programs: An application using pink-footed geese
Fred Johnson, Guthrie S. Zimmerman, Gitte H. Jensen, Kevin K. Clausen, Morten Frederiksen, Jesper Madsen
2020, Ecological Modelling (415)
Development of integrated population models (IPMs) assume the absence of systematic bias in monitoring programs, yet many potential sources of systematic bias in monitoring data exist (e.g., under-counts of abundance). By integrating multiple sources of data, we can assess whether various sources of monitoring data provide consistent inferences about changes...
Directivity of M 3.1 earthquake near Anza, California and the effect on peak ground motion
Jon Peter B. Fletcher, John Boatwright
2020, Bulletin of the Seismological Society of America (110) 312-318
We show the effect of rupture directivity on peak ground‐motion values for a moderate magnitude event at Anza, California, and neighboring stations at the Imperial Valley. The event was located near Borrego Springs on the west side of the Salton Sea and was well recorded at broadband stations near Anza,...
Estimating population size with imperfect detection using a parametric bootstrap
Lisa Madsen, Daniel Dalthorp, Manuela Huso, Andy Aderman
2020, Environmetrics (31)
We develop a novel method of estimating population size from imperfectly detected counts of individuals and a separate estimate of detection probability. Observed counts are separated into classes within which detection probability is assumed constant. Within a detection class, counts are modeled as a single binomial...
Heat accumulation on coral reefs mitigated by internal waves
Alex S. J. Wyatt, James J. Leichter, Lauren T. Toth, Toshihiro Miyajima, Richard B. Aronson, Toshi Nagata
2020, Nature Geoscience (13) 28-34
Coral reefs are among the most species-rich, productive and economically valuable ecosystems on Earth but increasingly frequent pantropical coral bleaching events are threatening their persistence on a global scale. The 2015–2016 El Niño led to the hottest sea surface temperatures on record and widespread bleaching of shallow-water corals. However, the...
Life history structure of westslope cutthroat trout: Inferences from otolith microchemistry
John W Heckel, Michael C. Quist, Carson J. Watkins, Andrew M. Dux
2020, Fisheries Research (222)
Life history diversity is important for population stability and is dependent on connectivity to habitat that supports all life stages and life history strategies for a species. Westslope Cutthroat Trout Oncorhynchus clarkii lewisi (WCT) exhibit plasticity in life history strategies in response to environmental variability, but fisheries managers have been challenged with...
Post-fire aspen (Populus tremuloides) regeneration varies in response to winter precipitation across a regional climate gradient
Susan K. McIlroy, Douglas J. Shinneman
2020, Forest Ecology and Management (455)
Altered climate and changing fire regimes are synergistically impacting forest communities globally, resulting in deviations from historical norms and creation of novel successional dynamics. These changes are particularly important when considering the stability of a keystone species such as quaking aspen...
Compound effects of water clarity, inflow, wind and climate warming on mountain lake thermal regimes
Kyle R. Christianson, Brett M. Johnson, Mevin Hooten
2020, Aquatic Sciences (82)
Many studies have examined the effects of climate warming on lake stability, but few have addressed environmental changes concomitant with climate change, such as alterations in water clarity and lake inflow. Although air temperature rise is a predominant factor linked to lake thermal characteristics, climate-driven changes at watershed scales can...
A temporally stratified extension of space‐for‐time Cormack–Jolly–Seber for migratory animals
Dalton J. Hance, Russell Perry, John Plumb, Adam C. Pope
2020, Biometrics (76) 900-912
Understanding drivers of temporal variation in demographic parameters is a central goal of mark‐recapture analysis. To estimate the survival of migrating animal populations in migration corridors, space‐for‐time mark–recapture models employ discrete sampling locations in space to monitor marked populations as they move past monitoring sites, rather than the standard practice...
The mineral diversity of Jezero crater: Evidence for possible lacustrine carbonates on Mars
Briony H. N. Horgan, Ryan B. Anderson, G. Dromart, Elena S. Amador, Melissa S. Rice
2020, Icarus (339)
Noachian-aged Jezero crater is the only known location on Mars where clear orbital detections of carbonates are found in close proximity to clear fluvio-lacustrine features indicating the past presence of a paleolake; however, it is unclear whether or not the carbonates in Jezero are related to the lacustrine activity. This...
Seasonal variation in sediment delivery across the bay-marsh interface of an estuarine salt marsh
Jessica R. Lacy, Madeline R. Foster-Martinez, Rachel Allen, Matthew C. Ferner, John C. Callaway
2020, Journal of Geophysical Research C: Oceans (125)
Sediment transport across bay–marsh interfaces depends on wave energy, vegetation, and marsh-edge morphology, and varies over a range of timescales. We investigated these dynamics in a tidal salt marsh with a gently-sloped, vegetated edge adjacent to northern San Francisco Bay. Spartina foliosa (cordgrass) inhabits the lower marsh and Salicornia pacifica...
#EarthquakeAdvisory: Exploring discourse between government officials, news media and social media during the Bombay Beach 2016 Swarm
Sara K. McBride, Andrea L. Llenos, Morgan T. Page, Nicholas van der Elst
2020, Seismological Research Letters (91) 438-451
Communicating probabilities of natural hazards to varied audiences is a notoriously difficult task. Many of these challenges were encountered during the 2016 Bombay Beach, California, swarm of ~100 2≤M≤4.3 earthquakes, which began on 26 September 2016 and lasted for several days. The swarm’s proximity to the...
Grazing-induced changes to biological soil crust cover mediate hillslope erosion in a long-term exclosure experiment
Stephen E. Fick, Jayne Belnap, Michael C. Duniway
2020, Rangeland Ecology & Management (73) 61-72
Dryland ecosystems are particularly vulnerable to erosion generated by livestock grazing. Quantifying this risk across a variety of landscape settings is essential for successful adaptive management, particularly in light of a changing climate. In the Upper Colorado River Basin, there are...
Vulnerability of resource-users in Louisiana’s oyster fishery to environmental hazards
A. T. Humphries, L. Josephs, Megan K. LaPeyre, S. A. Hall, R.D. Beech
2020, Ecology and Society (24)
Knowledge of vulnerability provides the foundation for developing actions that minimize impacts on people while maximizing the sustainability of ecosystem goods and services. As a result, it is becoming increasingly important to determine how resource-dependent people are vulnerable to environmental hazards. This is particularly true in coastal Louisiana where the...
Isotopic and geochemical assessment of the sensitivity of groundwater resources of Guam, Mariana Islands, to intra- and inter-annual variations in hydroclimate
Lakin Beal, Corinne I. Wong, Kaylyn K Bautista, John W. Jenson, Jay L. Banner, Mark A Lander, Stephen B. Gingerich, Judson W. Partin, Ben Hardt, N.H. van Oort
2020, Journal of Hydrology (568) 174-183
Assessing the sensitivity of groundwater systems to hydroclimate variability is critical to sustainable management of the water resources of Guam, US territory. We assess spatial and temporal variability of isotopic and geochemical compositions of vadose and phreatic groundwater sampled from cave drip sites and production wells, respectively, to better understand the vulnerability of the...
Does vegetation change over 28 years affect habitat use and reproductive success?
Karolina Fierro-Calderón, Thomas E. Martin
2020, The Auk (137) 1-9
Individuals should prefer and use habitats that confer high fitness, but habitat use is not always adaptive. Vegetation in natural landscapes changes gradually and the ability of species to adaptively adjust their habitat use to long-term changes is largely unstudied. We studied nest patch and territory use over 28 yr...
Nonlinear reaction–diffusion process models improve inference for population dynamics
Xinyi Lu, Perry J. Williams, Mevin Hooten, James A. Powell, Jamie N. Womble, Michael R. Bower
2020, Environmetrics (31)
Partial differential equations (PDEs) are a useful tool for modeling spatiotemporal dynamics of ecological processes. However, as an ecological process evolves, we need statistical models that can adapt to changing dynamics as new data are collected. We developed a model that combines an ecological diffusion equation and logistic growth to...
Change points in annual peak streamflows: Method comparisons and historical change points in the United States
Karen R. Ryberg, Glenn A. Hodgkins, Robert W. Dudley
2020, Journal of Hydrology (583)
Change-point, or step-trend, detection is an active area of research in statistics and an area of great interest in hydrology because change points may be evidence of natural or anthropogenic changes in climatic, hydrologic, or landscape processes. A common change-point technique is the Pettitt test; however, many change-point methods are...
Hydrologic modeling for flow-ecology science in the Southeastern United States and Puerto Rico
Peter V. Caldwell, Jonathan G. Kennen, Ernie F. Hain, Stacy A.C. Nelson, Ge Sun, Steven G. McNulty
2020, General Technical Report SRS-246
An understanding of the applicability and utility of hydrologic models is critical to support the effective management of water resources throughout the Southeastern United States (SEUS) and Puerto Rico (PR). Hydrologic models have the capacity to provide an estimate of the quantity of available water at ungauged locations (i.e., areas...
