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Depth of magma crystallization and fluid exsolution beneath the porphyry-skarn Cu deposits at Santa Rita and Hanover-Fierro, New Mexico, USA Depth of magma crystallization and fluid exsolution beneath the porphyry-skarn Cu deposits at Santa Rita and Hanover-Fierro, New Mexico, USA
The depth level at which porphyry Cu–forming magmas fractionated and exsolved mineralizing fluids is actively debated. In the classic model, extensive magma fractionation occurs in large, upper crustal magma chambers, and concomitant fluid exsolution leads to forceful expulsion of residual magmas in the form of porphyry dikes, stocks, and breccia pipes, which subsequently serve as...
Authors
Andreas Audétat, Jia Chang, Sean Patrick Gaynor
Trophic assessment of potential competition between invasive cichlids and sport fish in Puerto Rico reservoirs Trophic assessment of potential competition between invasive cichlids and sport fish in Puerto Rico reservoirs
Objective Several species of New World cichlids have recently invaded reservoirs in Puerto Rico, potentially jeopardizing established recreationally important, albeit nonnative, sport fish populations. Interactions between invasive species and important sport fish must be understood so that they can be mitigated when feasible. This study compared monthly prey consumption between three...
Authors
J. Wesley Neal, Jacob A. Moreland, Corey Garland Dunn, Peter J. Allen
Temporal changes in nutrient concentrations in the Lower Grand River and selected drainage basins, Missouri and Iowa, during the Mississippi River Basin Healthy Watersheds Initiative (2010–23) Temporal changes in nutrient concentrations in the Lower Grand River and selected drainage basins, Missouri and Iowa, during the Mississippi River Basin Healthy Watersheds Initiative (2010–23)
This report describes a cooperative study by the U.S. Geological Survey and Missouri Department of Natural Resources that evaluated temporal changes in total nitrogen (TN) and total phosphorus (TP) concentrations in the Lower Grand River hydrologic unit. The study focused on trends since 2010, when the basin was designated as a priority drainage basin of the Mississippi River Basin...
Authors
Brock J.W. Kamrath, Courtney N. Lauderback, Jennifer C. Murphy
An evaluation of the effects of different deicing salt application rates on three watersheds in Essex County, New York An evaluation of the effects of different deicing salt application rates on three watersheds in Essex County, New York
The U.S. Geological Survey, in cooperation with the New York State Department of Transportation, evaluated the effects of different deicing salt application rates on surface water, groundwater, and highway runoff quality near State highways in northern New York. Three reaches of State highways were tested with different deicing treatments between October 2019 and November 2022: a salt...
Authors
Kristina Gutchess, Natasha Scavotto, Amanda Dondero, Joshua C. Woda, Neil C. Terry, Kirk P. Smith, John H. Williams
Integration of GNSS-R derived soil moisture into the USGS Wildland Fire Potential Index Integration of GNSS-R derived soil moisture into the USGS Wildland Fire Potential Index
Observations of soil moisture have been found to improve predictions of fire danger as soil moisture impacts both fuel load and fuel moisture. A relative soil moisture process was developed and integrated into the USGS Wildland Fire Potential Index data products. The process uses soil moisture estimates from the CYGNSS GNSS-R constellation and compares current to historical values which...
Authors
Kurtis Nelson, Sreeja Roy-SIngh, Vinay Ravindra, Mahta Moghaddam, Archana Kannan, Amer Melebari
Grass-Cast Southwest: A seasonal rangeland productivity forecast for the southwestern United States Grass-Cast Southwest: A seasonal rangeland productivity forecast for the southwestern United States
Here, we present a first assessment of the US Department of Agriculture’s (USDA) “Grass-Cast Southwest,” which is a forecasting tool for rangeland aboveground net primary productivity (ANPP) for the southwest region of the United States. Our results show that ANPP forecasts in early April were relatively close to the observation-based ANPP estimates in late May for all years evaluated (R...
Authors
Emilio Aguilar-Cubilla, Malannie D. Hartman, William J. Parton, Sasha C. Reed, Justin D. Derner, Darin K. Schulte, Elise S. Gornish, David J.P. Moore, Emile Elias, Dannele E. Peck, Brian A. Fuchs, William K. Smith
Evaluating the central–marginal hypothesis: Introgression and genetic variation at the trailing edge of Quercus bicolor Evaluating the central–marginal hypothesis: Introgression and genetic variation at the trailing edge of Quercus bicolor
The central–marginal hypothesis (CMH) predicts reduced genetic diversity and increased differentiation in range-edge populations due to ecological marginality and limited gene flow. Deviations from this pattern, however, can result from historical demographic processes, variation in reproductive strategies or interspecific hybridization. The genus Quercus, known for hybridization and...
Authors
Jesse B. Parker, Sean Hoban, Laura M. Thompson, Scott E. Schlarbaum
Water residence time and water depth influence on nutrient conditions, eutrophication endpoints and habitat quality in backwater lakes of a large floodplain river Water residence time and water depth influence on nutrient conditions, eutrophication endpoints and habitat quality in backwater lakes of a large floodplain river
Many eutrophication studies focus on the external supply of critical nutrients like nitrogen and phosphorus, but hydrology and geomorphology can enhance or dampen the effects of excessive nutrient supply. We studied six backwater lakes in the Upper Mississippi River that varied in water residence time and water depth. Eutrophication in these systems is responsible for negative impacts...
Authors
Shawn M. Giblin, James H. Larson, Jeremy D. King
Causal networks to inform decisions for ecological restoration Causal networks to inform decisions for ecological restoration
The release of contaminants into the environment can occur from anthropogenic activities, such as oil extraction and transportation, mining, and industrial processes. Remediation associated with reducing contaminant concentrations, and restoration that improves animals and supporting habitat, are often needed to restore ecosystems to their pre-release, baseline condition. We demonstrated...
Authors
Christopher James Kotalik, Freya Elizabeth Rowland, Bruce G. Marcot, Kristin E. Skrabis, David M. Walters, Jo Ellen Hinck, William H. Clements, Eric E. Richer, John P. Isanhart
Spatial occupancy patterns of the endangered northern long‐eared bat in New England Spatial occupancy patterns of the endangered northern long‐eared bat in New England
Aim White-nose syndrome has caused severe declines in eastern North American cave bats, leading to the federal listing of the northern long-eared bat (Myotis septentrionalis) as endangered in the United States and Canada. This has heightened the importance of long-term monitoring to inform species status assessments. We employed a combination of long-term repeated and single-season...
Authors
Jesse L De La Cruz, Sabrina M. Deeley, Elizabeth Ann Hunter, W. Mark Ford
Development of high-throughput genomic resources to inform white-tailed deer population and disease management Development of high-throughput genomic resources to inform white-tailed deer population and disease management
White-tailed deer (Odocoileus virginianus) are the most abundant and widespread cervid in North America. Genetic data are used as a tool to monitor populations and make management decisions for this game species. However, the development and use of genomic tools that can generate a set of markers suitable for longitudinal genomic data collection, whether for management purposes or to...
Authors
David Navarro, Emily K. Latch, Anaïs K. Tallon, Caitlin N. Ott-Conn, Randy W. DeYoung, Daniel P. Walsh, Peter T. Euclide, R.G. Chandika, Wes A. Larson, Arun S. Seetharam, Andrew J. Severin, Andrew J. Severin, James M. Reecy, Zhi-Liang Hu, Jay R. Cantrell, Michelle Carstensen, Joe N. Caudell, Charlie H. Killmaster, Mitch L. Lockwood, William T. McKinley, Andrew S. Norton, Krysten L. Schuler, Daniel J. Storm, Jason A. Sumners, W. David Walter, Julie A. Blanchong
Assessing the topographic distribution of legacy soil phosphorus in agricultural fields of the Delmarva Peninsula, Mid-Atlantic Coastal Plain, USA Assessing the topographic distribution of legacy soil phosphorus in agricultural fields of the Delmarva Peninsula, Mid-Atlantic Coastal Plain, USA
Phosphorus (P) management remains a challenge in agricultural watersheds. The Choptank River Conservation Effects Assessment Project watershed, located in Maryland and Delaware and draining to the Chesapeake Bay, contains legacy soil P from historical dairy and poultry manure applications. These practices elevated soil P beyond crop needs, contributing to persistent P export to aquatic...
Authors
Maryam Foroughi, Ling Du, Isis P Scott, W. Dean Hively, Zachary P. Simpson, Zacharias J. Smith, Cathleen J. Hapeman, Martin C. Rabenhorst, Raymond R. Weil, Greg W. McCarty