Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 9969
Simulation of groundwater flow in the Brunswick Area, Georgia, for 2004 and 2015, and selected groundwater-management scenarios
The Upper Floridan aquifer (UFA) is the principal water source for industrial and public supply in Glynn County, Georgia. Wells in active pumping centers that tap the UFA for industries near the city of Brunswick have created an upward hydraulic-head gradient in the Floridan aquifer system, which has allowed high chloride (saline) groundwater from the Fernandina permeable zone of the Lower Florida
Authors
Gregory S. Cherry
Negative frequency-dependent foraging behaviour in a generalist herbivore (Alces alces) and its stabilizing influence on food-web dynamics
1. Resource selection is widely appreciated to be context‐dependent and shaped by both biological and abiotic factors. However, few studies have empirically assessed the extent to which selective foraging behaviour is dynamic and varies in response to environmental conditions for free‐ranging animal populations.
2. Here, we assessed the extent that forage selection fluctuated in response to diffe
Authors
Sarah R. Hoy, John A. Vucetich, Rongsong Liu, Don DeAngelis, Rolf O. Peterson, Leah M. Vucetich, John J. Henderson
Characterizing groundwater/surface-water interaction using hydrograph-separation techniques and groundwater-level data throughout the Mississippi Delta, USA
The Mississippi Delta, located in northwest Mississippi, is an area dense with industrial-level agriculture sustained by groundwater-dependent irrigation supplied by the Mississippi River Valley Alluvial aquifer (alluvial aquifer). The Delta provides agricultural commodities across the United States and around the world. Observed declines in groundwater altitudes and streamflow contemporaneous wit
Authors
Courtney D. Killian, William H. Asquith, Jeannie R. B. Barlow, Gardner C. Bent, Wade Kress, Paul M. Barlow, Darrel W. Schmitz
Atrazine induced transgenerational reproductive effects in medaka (Oryzias latipes)
Atrazine is presently one of the most abundantly used herbicides in the United States, and a common contaminant of natural water bodies and drinking waters in high-use areas. Dysregulation of reproductive processes has been demonstrated in atrazine exposed fish, including alteration of key endocrine pathways on hypothalamic-pituitary-gonadal (HPG) axis. However, the potential for atrazine-induced
Authors
Jacob A. Cleary, Donald E. Tillitt, Fredrick S. vom Saal, Diane Nicks, Rachel Claunch, Ramji K. Bhandari
Assessing water quality from highway runoff at selected sites in North Carolina with the Stochastic Empirical Loading and Dilution Model (SELDM)
In 2015, the U.S. Geological Survey (USGS) entered into a cooperative agreement with the North Carolina Department of Transportation (NCDOT) to develop a North Carolina-enhanced variation of the national Stochastic Empirical Loading and Dilution Model (SELDM) with available North Carolina-specific streamflow and water-quality data and to demonstrate use of the model by documenting selected simulat
Authors
J. Curtis Weaver, Gregory E. Granato, Sharon A. Fitzgerald
Encylopedia of Caves
For many people, a visit to a cave is a wondrous event directing our minds to ponder the mysteries presented by these unique places
and inspiring questions: How old is the cave? What was the role of water in forming the cave and where did the water come from?
How is the cave connected to the surface environment? These are intriguing questions to ask, and karst scientists use isotope
geochemistry t
Authors
Katherine J. Knierim, Phillip D. Hays
Revisions to suspended-sediment concentration, percent smaller than 0.063 millimeter, and instantaneous suspended-sediment discharge reported for a cooperative program between the U.S. Geological Survey and the U.S. Army Corps of Engineers in the lower Mi
This report presents revised results for four parameters reported for suspended-sediment samples that were collected in the lower Mississippi-Atchafalaya River Basin as part of a cooperative program between the U.S. Army Corps of Engineers, Mississippi Valley Division, New Orleans District and the U.S. Geological Survey (USGS). The cooperative program has been active since 1973 at seven sites: two
Authors
Katherine K. Norton, Lisa D. Olsen, Todd E. Baumann, Lane B. Simmons, Athena P. Clark, Dennis K. Demcheck, Marlon Johnson
Linking management planning for coastal wetlands to potential future wave attenuation under a range of relative sea-level rise scenarios
Understanding changes in wave attenuation by emergent vegetation as wetlands degrade or accrete over time is crucial for incorporation of wetlands into holistic coastal risk management. Linked SLAMM and XBeach models were used to investigate potential future changes in wave attenuation over a 50-year period in a degrading, subtropical wetland and a prograding, temperate wetland. These contrasting
Authors
Ann Hijuelos, Jasper Dijkstra, Tim J. B. Carruthers, Karel Heynert, Denise Reed, Bregje van Wesenbeeck
Characterization of the exoskeleton of the Antarctic king crab Paralomis birsteini
Ocean acidification is projected to inhibit the biogenic production of calcium-carbonate skeletons in marine organisms. Antarctic waters represent a natural environment in which to examine the long-term effects of carbonate undersaturation on calcification in marine predators. King crabs (Decapoda: Anomura: Lithodidae), which currently inhabit the undersaturated environment of the continental slop
Authors
Brittan V. Steffel, Kathryn E. Smith, Gary H. Dickinson, Jennifer A. Flannery, Kerstin A. Baran, Miranda N. Rosen, James B. Mcclintock, Richard B. Aronson
Monitoring live vegetation in semiarid and arid rangeland environments with satellite remote sensing in northern Kenya
As part of the U.S. Department of the Interior’s (DOI) commitment to provide technical assistance to the Kenyan Northern Rangelands Trust (NRT), the U.S. Geological Survey, in collaboration with the DOI International Technical Assistance Program and the U.S. Agency for International Development’s regional mission in East Africa, created a high spatial and time-sensitive live vegetation monitoring
Authors
Amina Rangoonwala, Elijah W. Ramsey III
Eradication of two non-native cichlid fishes in Miami, Florida (USA)
The proliferation of non-native fishes in Florida is a serious problem, and new species continue to be introduced to the state. Fishes in the Family Cichlidae have been especially successful colonizers of south Florida freshwater habitats. Herein we report a multi-agency effort to eradicate two non-native cichlid fishes in Miami, Florida (Bay Snook Petenia splendida and Blue Mbuna Labeotropheus fu
Authors
Pamela J. Schofield, Howard L. Jelks, Kelly B. Gestring
Temperature mediates secondary dormancy in resting cysts of Pyrodinium bahamense (Dinophyceae)
High‐biomass blooms of the toxic dinoflagellate Pyrodinium bahamense occur most summers in Tampa Bay, Florida, USA, posing a recurring threat to ecosystem health. Like many dinoflagellates, P. bahamense forms immobile resting cysts that can be deposited on the seafloor—creating a seed bank that can retain the organism within the ecosystem and initiate future blooms when cysts germinate. In this st
Authors
Cary B. Lopez, Aliza Karim, Susan Murasko, Marci E. Marot, Christopher G. Smith, Alina A. Corcoran