Mineral deposit discovery order and three-part quantitative assessments
Donald A. Singer, Michael L. Zientek
2021, Ore Geology Reviews (139)
Larger oil pools tending to be discovered earlier in an exploration play suggests the same pattern might exist for mineral deposits and could be used in predicting sizes of undiscovered deposits in mineral assessments. The volume of individual...
Exposure of predatory and scavenging birds to anticoagulant rodenticides in France: Exploration of data from French surveillance programs
Meg-Anne Moriceau, Sebastien Lefebvre, Isabelle Fourel, Etienne Benoit, Florence Buronfosse, Pascal Orabi, Barnett A. Rattner, Virginie Lattard
2021, Science of the Total Environment (810)
Wild raptors are widely used to assess exposure to different environmental contaminants, including anticoagulant rodenticides (ARs). ARs are used on a global scale for rodent control, and act by disruption of the vitamin K cycle that results in haemorrhage usually accompanied by death within...
A basin-scale approach to estimating recharge in the desert: Anza-Cahuilla groundwater basin, CA
Michelle A. Stern, Lorraine E. Flint, Alan L. Flint, Allen H. Christensen
2021, Journal of the American Water Resources Association (57) 990-1003
The Anza-Cahuilla groundwater basin located mainly in the semi-arid headwaters of the Santa Margarita River watershed in southern California is the principle source of groundwater for a rural disadvantaged community and two Native American Tribes, the Ramona Band of Cahuilla and the Cahuilla. Groundwater in the study area is derived...
Evidence of glacial activity during MIS 4 in the Rocky Mountains, Colorado, USA
Jeffrey S. Honke, Jeffrey S. Pigati, J. Michael Daniels
2021, Arctic, Antarctic, and Alpine Research (53) 252-268
The Ziegler Reservoir fossil site near Snowmass Village, Colorado, provides a rare opportunity to examine environmental conditions in the Rocky Mountains during marine isotope stage (MIS) 4 (71–57 ka). Although recognized as a global-scale cold event, MIS 4 is typically absent from Rocky Mountain glacial chronologies because the...
Synthesis of data and studies relating to Delta Smelt biology in the San Francisco Estuary, emphasizing water year 2017
Shawn Acuna, Randy Baxter, Aaron J. Bever, Larry R. Brown, Christina Burdi, Gonzalo Castillo, Louise Conrad, Steven Culberson, Lauren Damon, Jared Frantzich, Lenny Grimaldo, Bruce Hammock, April Hennessy, James A. Hobbs, Shruti Khanna, Peggy W. Lehman, Michael L. MacWilliams, Brian Mahardja, Andrew A. Schultz, Steven B. Slater, Ted Sommer, Swee Teh, Janet Thompson
2021, Interagency Ecological Program Technical Report 95
In the San Francisco Estuary (SFE), the effects of freshwater flow on the aquatic ecosystem have been studied extensively over the years and remains a contentious management issue. It is especially contentious with regards to the Delta Smelt (Hypomesus transpacificus), a species endemic to the SFE that has been listed...
Northern bobwhite occupancy patterns on multiple spatial scales across Arkansas
E. V. Lassiter, M. Asher, G. Christie, C. Gale, A. Massey, C. Massery, C. R. MIddaugh, J. Veon, Brett Alexander DeGregorio
2021, Journal of Fish and Wildlife Management (12) 502-512
Northern bobwhite Colinus virginianus populations have been rapidly declining in the eastern, central, and southern United States for decades. Land use change and an incompatibility between northern bobwhite resource needs and human land use practices have driven declines. Here, we applied occupancy analyses on two spatial scales (state level and ecoregion level)...
Sustaining transmission in different host species: The emblematic case of Sarcoptes scabiei
E Browne, MM Driessen, Paul C. Cross, L. E. Escobar, Janet E. Foley, Lopez-Olvera, KD Niedringhaus, Liza Rossi, Scott Carver
2021, BioScience
Some pathogens sustain transmission in multiple different host species, but how this epidemiologically important feat is achieved remains enigmatic. Sarcoptes scabiei is among the most host generalist and successful of mammalian parasites. We synthesize pathogen and host traits that mediate sustained transmission and present cases illustrating three transmission mechanisms...
Diagenetic barite-pyrite-wurtzite formation and redox signatures in Triassic mudstone, Brooks Range, northern Alaska
John F. Slack, Ryan J. McAleer, Wayne (Pat) Shanks, Julie A. Dumoulin
2021, Chemical Geology (585)
Mineralogical and geochemical studies of interbedded black and gray mudstones in the Triassic part of the Triassic-Jurassic Otuk Formation (northern Alaska) document locally abundant barite and pyrite plus diverse redox signatures. These strata, deposited in an outer shelf setting at paleolatitudes of ~45 to 60°N, show widespread sedimentological evidence for...
Pb-Pb and U-Pb dating of cassiterite by in situ LA-ICPMS: Examples spanning ~1.85 Ga to ~100 Ma in Russia and implications for dating Proterozoic to Phanerozoic tin deposits.
Leonid A. Neymark, Anatoly M. Larin, Richard J. Moscati
2021, Minerals (11)
This paper investigates applicability of cassiterite to dating ore deposits in a wide age range. We report in situ LA-ICPMS U-Pb and Pb-Pb dating results (n = 15) of cassiterite from six ore deposits in Russia ranging in age from ~1.85 Ga to 93 Ma. The two oldest deposits dated...
Hierarchical clustering for paired watershed experiments: Case study in southeastern Arizona, U.S.A.
Roy Petrakis, Laura M. Norman, Kurt Vaughn, Richard Pritzlaff, Caleb Weaver, Audrey J Rader, H. Ronald Pulliam
2021, Water (13)
Watershed studies are often onerous due to a lack of data available to portray baseline conditions with which to compare results of monitoring environmental effects. A paired-watershed approach is often adopted to simulate baseline conditions in an adjacent watershed that can be comparable but assumes there is...
Understanding mast seeding for conservation and land management
Ian S. Pearse, Andreas Wion, Angela Gonzalez, Mario B. Pesendorfer
2021, Philosophical Transactions of the Royal Society B: Biological Sciences (376)
Masting, the intermittent and synchronous production of large seed crops, can have profound consequences for plant populations and the food webs that are built on their seeds. For centuries, people have recorded mast crops because of their importance in managing wildlife populations. In the past 30 years, we have begun...
Similarities and differences between two deadly Caribbean coral diseases: White plague and stony coral tissue loss disease
Aldo Cróquer, Ernesto Weil, Caroline Rogers
2021, Frontiers in Marine Science (8)
For several decades, white plagues (WPDs: WPD-I, II and III) and more recently, stony coral tissue loss disease (SCTLD) have significantly impacted Caribbean corals. These diseases are often difficult to separate in the field as they produce similar gross signs. Here we aimed to compare what we know...
Reproductive plasticity as an advantage of snakes during island invasion
S R Fisher, Robert N. Fisher, S E Alcaraz, R Gallo-Barneto, C Patino-Martinez, L F Lopez- Jurado, M Á Cabrera-Pérez, J L Grismer
2021, Conservation Science and Practice (3)
Most invasive species are not studied during their initial colonization of ecosystems to which they were recently introduced. Rather, research is typically performed after invasive species are well established and causing harm to the native biodiversity. Thus, novel adaptations of invasive species during their initial invasions...
Differential landscape use by forest owls two years after a mixed-severity wildfire
Leila S. Duchac, Damon B. Lesmeister, Katie Dugger, Raymond J. Davis
2021, Ecosphere (12)
Owls are important avian predators in forested systems, but little is known about landscape use by most forest-adapted owl species in environments impacted by mixed-severity wildfire. To better understand species-specific patterns of post-wildfire landscape use within an owl guild, we used passive acoustic monitoring using autonomous recording units. The technology...
The climate envelope of Alaska’s northern treelines: Implications for controlling factors and future treeline advance
Colin T. Maher, Roman J. Dial, Neal J. Pastick, Rebecca E. Hewitt, M. Torre Jorgenson, Patrick F. Sullivan
2021, Ecography (44) 1710-1722
Understanding the key mechanisms that control northern treelines is important to accurately predict biome shifts and terrestrial feedbacks to climate. At a global scale, it has long been observed that elevational and latitudinal treelines occur at similar mean growing season air temperature (GSAT) isotherms, inspiring the growth limitation hypothesis (GLH)...
Zirconium-bearing accessory minerals in UK Paleogene granites: Textural, compositional, and paragenetic relationships
Harvey E. Belkin, Ray MacDonald
2021, European Journal of Mineralogy (37) 537-570
The mineral occurrences, parageneses, textures, and compositions of Zr-bearing accessory minerals in a suite of UK Paleogene granites from Scotland and Northern Ireland are described. Baddeleyite, zirconolite, and zircon, in that sequence, formed in hornblende + biotite granites (type 1) and hedenbergite–fayalite granites (type 2). The peralkaline microgranite (type 3) of...
Informing future condition scenario planning for habitat specialists of the imperiled pine rockland ecosystem of South Florida
Susan C. Walls
2021, Report
This project evaluated habitat conditions for two species found in the imperiled pine rockland ecosystem—the Rim Rock Crowned Snake (Tantilla oolitica) and the Key Ring-Necked Snake (Diadophis punctatus acricus). The Rim Rock Crowned Snake historically occurred in eastern Miami-Dade County (hereafter, mainland) as well as throughout the Florida Keys, whereas...
Analysis of Escherichia coli, total recoverable iron, and dissolved selenium concentrations, loading, and identifying data gaps for selected 303(d) listed streams, Grand Valley, western Colorado, 1980–2018
Lisa D. Miller, Rachel G. Gidley, Natalie K. Day, Judith C. Thomas
2021, Scientific Investigations Report 2021-5053
Tributaries to the Colorado River in the Grand Valley in western Colorado (segment COLCLC13b) have been placed on the State of Colorado 303(d) list as impaired for Escherichia coli (E. coli), total recoverable iron, and dissolved selenium. The Colorado Department of Public Health and Environment Water Quality Control Division is...
The structure and volume of large geysers in Yellowstone National Park, USA and the mineralogy and chemistry of their silica sinter deposits
Dakota Churchill, Michael Manga, Shaul Hurwitz, Sara Peek, David Damby, Richard Conrey, John R. Wood, R. Blaine McCleskey, William E. Keller, Behnaz Hosseini, Jefferson D.G. Hungerford
2021, Journal of Volcanology and Geothermal Research (419)
Siliceous sinter is formed by biogenic and abiogenic opal deposition around hot springs and geysers. Using Structure-from-Motion photogrammetry we generated three-dimensional models of Giant and Castle Geysers from the Upper Geyser Basin of Yellowstone National Park. We use these models to calculate...
Mapping critical minerals from the sky
Anjana K. Shah, Robert Morrow, Michael Pace, M.Scott Harris, William Doar
2021, GSA Today (31)
Critical mineral resources titanium, zirconium, and rare earth elements occur in placer deposits over vast parts of the U.S. Atlantic Coastal Plain. Key questions regarding provenance, pathways of minerals to deposit sites, and relations to geologic features remain unexplained. As part of a national effort to collect data over regions...
The application of metacommunity theory to the management of riverine ecosystems
Christopher J. Patrick, Kurt E. Anderson, Brown L. Brown, Charles P. Hawkins, Anya N. Metcalfe, Parsa Saffarinia, Tadeu Siqueira, Christopher M. Swan, Jonathan D. Tonkin, Lester L. Yuan
2021, WIREs Water (8)
River managers strive to use the best available science to sustain biodiversity and ecosystem function. To achieve this goal requires consideration of processes at different scales. Metacommunity theory describes how multiple species from different communities potentially interact with local-scale environmental drivers to influence population dynamics and community structure. However, this...
Demographic modeling informs functional connectivity and management interventions in Graham’s beardtongue
Matthew Richard Jones, Daniel E. Winkler, Robert Massatti
2021, Conservation Genetics (22) 993-1003
Functional connectivity (i.e., the movement of individuals across a landscape) is essential for the maintenance of genetic variation and persistence of rare species. However, illuminating the processes influencing functional connectivity and ultimately translating this knowledge into management practice remains a fundamental challenge. Here, we combine various...
Unexpected diversity of Endozoicomonas in deep-sea corals
Christina A. Kellogg, Zoe A. Pratte
2021, Marine Ecology Progress Series (673) 1-15
ABSTRACT: The deep ocean hosts a large diversity of azooxanthellate cold-water corals whose associated microbiomes remain to be described. While the bacterial genus Endozoicomonas has been widely identified as a dominant associate of tropical and temperate corals, it has rarely been detected in deep-sea corals. Determining microbial baselines for these cold-water...
What do you mean by false positive?
John A. Darling, Christopher L. Jerde, Adam Sepulveda
2021, Environmental DNA (3) 879-883
Misunderstandings regarding the term “false positive” present a significant hurdle to broad adoption of eDNA monitoring methods. Here, we identify three challenges to clear communication of false-positive error between scientists, managers, and the public. The first arises from a failure to distinguish between false-positive eDNA detection at the sample level...
Bayesian change point quantile regression approach to enhance the understanding of shifting phytoplankton-dimethyl sulfide relationships in aquatic ecosystems
Zhongyao Liang, Yong Liu, Yaoyang Xu, Tyler Wagner
2021, Water Research (201)
Dimethyl sulfide (DMS) serves as an anti-greenhouse gas, plays multiple roles 7 in aquatic ecosystems, and contributes to the global sulfur cycle. The chlorophyll 8 a (CHL, an indicator of phytoplankton biomass)-DMS relationship is critical for 9 estimating DMS emissions from aquatic ecosystems. Importantly, recent research...
