Potential threats facing a globally important population of the magnificent frigatebird Fregata magnificens
S. Zaluski, L.M. Soanes, J.A. Bright, A. Georges, Patrick G.R. Jodice, K. Meyer, Woodfield- Pascoe N., J.A Green
2019, Tropical Zoology (32) 188-201
Tracking of seabirds has been used to identify foraging hotspots, migratory routes and to assess at-sea threats facing populations. One such threat is the potential negative interaction between seabirds and fisheries through incidental by-catch. In 2012, 60 magnificent frigatebirds Fregata magnificens were found dead, entangled in fishing line,...
Marine fog inputs appear to increase methylmercury bioaccumulation in a coastal terrestrial food web
Peter S. Weiss-Penzias, Michael S. Bank, Deana L. Clifford, Alicia A. Torregrosa, Belle Zheng, Wendy Lin, Christopher C. Wilmers
2019, Scientific Reports (9)
Coastal marine atmospheric fog has recently been implicated as a potential source of ocean-derived monomethylmercury (MMHg) to coastal terrestrial ecosystems through the process of sea-to-land advection of foggy air masses followed by wet deposition. This study examined whether pumas (Puma concolor) in coastal central California, USA, and their associated food...
Riparian soil nitrogen cycling and isotopic enrichment in response to a long-term salmon carcass manipulation experiment
Megan Feddern, Gordon W. Holtgrieve, Steven S. Perakis, Julia A. Hart, Hyejoo Ro, Tom Quinn
2019, Ecosphere (10)
Pacific salmon acquire most of their biomass in the ocean before returning to spawn and die in coastal streams and lakes, thus providing subsidies of marine‐derived nitrogen (MDN) to freshwater and terrestrial ecosystems. Recent declines in salmon abundance have raised questions of whether managers should mitigate for losses of salmon...
Phenotypic plasticity or a reproductive dead end? Primnoa pacifica (Cnidaria: Alcyonacea) in the southeastern Alaska region
Rhian G. Waller, Robert P. Stone, Lauren Rice, Julia Johnstone, Ashley M. Rossin, Elise Hartill, Keri Feehan, Cheryl Morrison
2019, Frontiers in Marine Science (6)
Red tree corals (Primnoa pacifica) are abundant in the eastern Gulf of Alaska, from the glacial fjords of Southeast Alaska where they emerge to as shallow as 6 m, to the continental shelf edge and seamounts where they are more commonly found at depths greater than 150 –...
Shallow-water foraminifera and other microscopic biota of Clipperton Island, tropical eastern Pacific
Mary McGann, Robert W Schmieder, Louis-Philippe Loncke
2019, Atoll Research Bulletin (626)
The recent foraminiferal fauna and associated microbiota of Clipperton Island (10.2833°N, 109.2167°W) were investigated at 20 sites collected in the intertidal zone around the perimeter of the island and from the edge of the inner brackish-water lagoon. Due to the island’s geographic location in a low productivity zone, a lack...
A parametric numerical analysis of factors controlling ground ruptures caused by groundwater pumping
Matteo Frigo, Massimiliano Ferronato, Jun Yu, Shujun Ye, Devin Galloway, Dora Carreon-Freyre, Pietro Teatini
2019, Water Resources Research (55) 9500-9518
A modeling analysis is used to investigate the relative susceptibility of various hydrogeologic configurations to aseismic rupture generation due to deformation of aquifer systems accompanying groundwater pumping. An advanced numerical model (GEPS3D) is used to simulate rupture generation and propagation for three typical processes: (i) reactivation of a preexisting...
The Zn–Pb mineralization of Florida Canyon, an evaporite-related Mississippi Valley-type deposit in Bongará district, northern Peru
Saulo B de Oliveira, David L Leach, Caetano Juliani, Lena VS Monteiro, Craig A. Johnson
2019, Economic Geology (114) 1621-1647
The Florida Canyon evaporite-related Zn–Pb sulfide deposit, in northern Peru, is one of the largest Mississippi Valley-type (MVT) deposits in South America. Triassic carbonate and former evaporite-bearing rocks of the Pucará Group host the ore bodies that comprise two different styles: (i) predominantly stratabound ore associated with hydrocarbon-rich porous dolostones...
Advances in quantifying streamflow variability across continental scales: 2. Improved model regionalization and prediction uncertainties using hierarchical Bayesian methods
Richard B. Alexander, Gregory E. Schwarz, Elizabeth W. Boyer
2019, Water Resources Research (55) 11061-11087
The precise estimation of process effects in hydrological models requires applying models to large scales with extensive spatial variability in controlling factors. Despite progress in large‐scale applications of hydrological models in conterminous United States (CONUS) river basins, spatial constraints in model parameters have prevented the interbasin...
Fishway entrance gate experiments with adult American Shad
Kevin Mulligan, Alexander J. Haro, Brett Towler, Bryan Sojkowski, John Noreika
2019, Water Resources Research (55) 10839-10855
The goal of this multiyear study was to examine how changes to an upstream fishway entrance impacted the passage rate of adult American shad (Alosa sapidissima). We evaluated a total of nine treatment conditions that consisted of three fishway entrance gate types and three submergence depths (i.e., the water surface...
The power, potential, and pitfalls of open access biodiversity data in range size assessments: Lessons from the fishes
Abigail Benson
2019, Ecological Indicators (110)
Geographic rarity is a driver of a species’ intrinsic risk of extinction. It encompasses multiple key components including range size, which is one of the most commonly measured estimates of geographic rarity. Range size estimates are often used to prioritize conservation efforts when there are multiple candidate species, because data...
Wind sheltering impacts on land-atmosphere fluxes over fens
Jessica Turner, Ankur R. Desai, Jonathan Thom, Kimberly P. Wickland, Brent Olson
2019, Frontiers in Environmental Science
Wetlands and their ability to mitigate climate change motivates restorative and protective action; however, scientific understanding of land-atmosphere interactions is restricted by our limited continuous observations of gaseous fluxes. Many wetlands are small in spatial scale and embedded in forested landscapes. Yet, little is known about how the relative sheltering...
The importance of natural versus human factors for ecological conditions of streams and rivers
Tao Tang, R. Jan Stevenson, James Grace
2019, Science of the Total Environment (704)
Streams are influenced by watershed-scale factors, such as climate, geology, topography, hydrology, and soils, which mostly vary naturally among sites, as well as human factors, agriculture and urban development. Thus, natural factors could complicate assessment of human disturbance. In the present study, we use structural equation modeling and data from...
Within-group relatedness and patterns of reproductive sharing and cooperation in the tropical chestnut-crested yuhina
Sara A. Kaiser, Thomas E. Martin, Juan C. Oteyza, Julie E. Danner, Connor E. Armstad, Robert C. Fleischer
2019, Animal Behaviour (158) 89-99
In cooperatively breeding animals, genetic relatedness among group members often determines the extent of reproductive sharing, cooperation and competition within a group. Studies of species for which cooperative behaviour is not entirely based on kinship are key for understanding the benefits...
Phytoplankton community and algal toxicity at a recurring bloom in Sullivan Bay, Kabetogama Lake, Minnesota, USA
Victoria Christensen, Ryan P. Maki, Erin A. Stelzer, Jack E. Norland, Eakalak Khan
2019, Scientific Reports (9)
Kabetogama Lake in Voyageurs National Park, Minnesota, USA suffers from recurring late summer algal blooms that often contain toxin-producing cyanobacteria. Previous research identified the toxin microcystin in blooms, but we wanted to better understand how the algal and cyanobacterial community changed throughout an open water season and how changes in...
Submergence responses of cool-season annual plants and potential for fish habitat
G Coppola, Leandro E. Miranda, ME Colvin, HR Hatcher, Marcus A. Lashley
2019, North American Journal of Fisheries Management (39) 1269-1276
Unnatural water regimes of flood control reservoirs limit vegetation establishment in littoral zones and produce mudflats with low structural complexity insufficient for many juvenile fishes. One strategy to enhance habitat on mudflats is to sow cool-season plants to provide submerged structure when inundated. However, how long the structure of these...
Precision of VS30 values derived from noninvasive surface wave methods at 31 sites in California
Alan K. Yong, Antony Martin, Jack Boatwright
2019, Soil Dynamics and Earthquake Engineering (127)
We study the inter- and intra-method variability of VS30 results by inverting/forward-modeling individual dispersion data for 31 seismographic stations located in California where combinations of surface-wave methods were applied and the minimum recorded wavelength from each method satisfies the 30-meter depth criteria. These methods consist of noninvasive geophysical (active...
Evaluation of artificial cover units as a sampling technique and habitat enhancement for madtoms in rivers
W. R. Cope, Thomas J. Kwak, T. R. Black, Krishna Pacifici
2019, North American Journal of Fisheries Management (39) 778-787
Instream habitat degradation and loss are major threats to freshwater fishes and critical conservation issues among nongame species, due to a lack of research and knowledge concerning their habitat requirements. Instream physical cover is an important component of fish habitat, especially for benthic species that require cover for reproduction and...
Effects of invasive plants on fire regimes and postfire vegetation diversity in an arid ecosystem
Emma C. Underwood, Robert C. Klinger, Matthew L. Brooks
2019, Ecology and Evolution (9) 12421-12435
We assessed the impacts of co‐occurring invasive plant species on fire regimes and postfire native communities in the Mojave Desert, western USA. We analyzed the distribution and co‐occurrence patterns of three invasive annual grasses (Bromus rubens, Bromus tectorum, and Schismus spp.) known to alter fuel conditions and community structure, and...
The potential resiliency of a created tidal marsh to sea-level rise
Brock J. W. Kamrath, Michael R. Burchell, Nicole Cormier, Ken W. Krauss, Darren Johnson
2019, Transactions of the ASABE (62) 1567-1577
The purpose of this study was to determine the elevation dynamics of a created tidal marsh on the North Carolina coast. Deep rod surface elevation tables (RSET) and feldspar marker horizons (MH) were installed in plots to measure net surface elevation changes and to quantify contributing processes. Twelve total plots...
La Niña-driven flooding in the Indo-Pacific warm pool during the past millennium
Jessica Rodysill, James M. Russell, Mathias Vuille, Sylvia Dee, Brent D. Lunghino, Satria Bijaksana
2019, Quaternary Science Reviews (225)
Extreme precipitation events are one of the most consequential components of climate change for society. The El Niño-Southern Oscillation (ENSO) is the dominant mode of precipitation variability in the tropics and causes severe flooding and drought in many socioeconomically vulnerable regions. It remains unclear how tropical rainfall extremes and ENSO...
The LArge-n Seismic Survey in Oklahoma (LASSO) experiment
S. Dougherty, Elizabeth S. Cochran, R. M. Harrington
2019, Seismological Research Letters (90) 2015-2057
In 2016, the U.S. Geological Survey deployed more than 1,800 vertical-component nodal seismometers in Grant County, Oklahoma to study induced seismic activity associated with production of the Mississippi Limestone Play. The LArge-n Seismic Survey in Oklahoma (LASSO) array operated for approximately one month, covering a 25-km-by-32-km region with a nominal...
Evolutionary dynamics of Ceratonova species (Cnidaria: Myxozoa) reveal different host adaptation strategies
Rachel B. Breyta, Stephen D Atkinson, Jerri L Bartholomew
2019, Infection, Genetics and Evolution (78)
The myxozoan parasite Ceratonova shasta is an important pathogen that infects multiple species of Pacific salmonids. Ongoing genetic surveillance has revealed stable host-parasite relationships throughout the parasite's endemic range. We applied Bayesian phylogenetics to test specific hypotheses about the evolution of these host-parasite relationships within the well-studied Klamath River watershed...
Precision mapping of snail habitat provides a powerful indicator of human schistosomiasis transmission
Chelsea L. Wood, Susanne H. Sokolow, Isabel J. Jones, Andrew J Chamberlin, Kevin D. Lafferty, Armand M. Kuris, Merlijn M. T. Jocque, Skylar R. Hopkins, Grant Adams, Julia C Buck, Andrea J Lund, Ana E Garcia-Vedrenne, Evan Fiorenza, Jason R. Rohr, Fiona Allan, Bonnie Webster, Muriel Rabone, Joanne P Webster, Lydie Bandagny, Raphael Ndione, Simon Senghor, Anne-Marie Schacht, Nicolas Jouanard, Gilles Riveau, Giulio A. De Leo
2019, PNAS (449) 23182-23191
Recently, the World Health Organization recognized that efforts to interrupt schistosomiasis transmission through mass drug administration have been ineffective in some regions; one of their new recommended strategies for global schistosomiasis control emphasizes targeting the freshwater snails that transmit schistosome parasites. We sought to identify robust indicators that would enable...
Tropical cyclones alter short-term activity patterns of a coastal seabird
B. P. Wilkinson, Y. G. Satge, J. S. Lamb, Patrick G.R. Jodice
2019, Movement Ecology (7)
BackgroundMobile organisms in marine environments are expected to modify their behavior in response to external stressors. Among environmental drivers of animal movement are long-term climatic indices influencing organism distribution and short-term meteorological events anticipated to alter acute movement behavior. However, few studies exist documenting the response of vagile...
Gray Wolf (Canis lupus) recolonization failure: A Minnesota case study
L. David Mech, Forest Isbell, Jim Krueger, John Harte
2019, Canadian Field-Naturalist (133) 60-65
During the past few decades, Gray Wolves (Canis lupus) have recolonized many areas in the United States and Europe. In many other cases, however, although dispersing wolves reached areas with adequate prey, a population failed to recolonize. Herein, we provide a case study detailing how a wolf pack attempted for...
