Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10566
Hydrologic conditions in the South Coast aquifer, Puerto Rico, 2010–15 Hydrologic conditions in the South Coast aquifer, Puerto Rico, 2010–15
In 1958, the U.S. Geological Survey began documenting hydrologic conditions, including groundwater levels, groundwater withdrawals for agricultural irrigation and public water supply, and water quality, in the South Coast aquifer, Puerto Rico. This information has improved the understanding of the water resources of the region. The hydrologic data indicate that (1) groundwater levels...
Authors
Sigfredo Torres-Gonzalez, Jose M. Rodriguez
Hydrogeological framework, numerical simulation of groundwater flow, and effects of projected water use and drought for the Beaver-North Canadian River alluvial aquifer, northwestern Oklahoma Hydrogeological framework, numerical simulation of groundwater flow, and effects of projected water use and drought for the Beaver-North Canadian River alluvial aquifer, northwestern Oklahoma
This report describes a study of the hydrology, hydrogeological framework, numerical groundwater-flow models, and results of simulations of the effects of water use and drought for the Beaver-North Canadian River alluvial aquifer, northwestern Oklahoma. The purpose of the study was to provide analyses, including estimating equal-proportionate-share (EPS) groundwater-pumping rates and the...
Authors
Derek W. Ryter, Jessica S. Correll
Integrative modelling reveals mechanisms linking productivity and plant species richness Integrative modelling reveals mechanisms linking productivity and plant species richness
How ecosystem productivity and species richness are interrelated is one of the most debated subjects in the history of ecology. Decades of intensive study have yet to discern the actual mechanisms behind observed global patterns. Here, by integrating the predictions from multiple theories into a single model and using data from 1,126 grassland plots spanning five continents, we detect...
Authors
James B. Grace, T. Michael Anderson, Eric W. Seabloom, Elizabeth T. Borer, Peter B. Adler, W Stanley Harpole, Yann Hautier, Helmut Hillebrand, Eric M. Lind, Meelis Pärtel, Jonathan D. Bakker, Yvonne M. Buckley, Michael J. Crawley, Ellen Ingman Damschen, Kendi F. Davies, Philip A. Fay, Jennifer Firn, Daniel S. Gruner, Andy Hector, Johannes M.H. Knops, Andrew S. MacDougall, Brett A. Melbourne, John W. Morgan, John L. Orrock, Suzanne M. Prober, Melinda D. Smith
Forcing and variability of nonstationary rip currents Forcing and variability of nonstationary rip currents
Surface wave transformation and the resulting nearshore circulation along a section of coast with strong alongshore bathymetric gradients outside the surf zone are modeled for a consecutive 4 week time period. The modeled hydrodynamics are compared to in situ measurements of waves and currents collected during the Nearshore Canyon Experiment and indicate that for the entire range of...
Authors
Joseph W. Long, H.T. Ozkan-Haller
Diet of diamondback terrapins (Malaclemys terrapin) in subtropical mangrove habitats in South Florida Diet of diamondback terrapins (Malaclemys terrapin) in subtropical mangrove habitats in South Florida
Unique among turtles as the only exclusively estuarine species, the diamondback terrapin’s (Malaclemys terrapin) life history predisposes it to impacts from humans both on land and in the near-shore environment. Terrapins are found in salt marshes and mangroves along the Atlantic and Gulf coasts from Massachusetts to Texas. Whereas previous dietary studies have elucidated terrapins’ role...
Authors
Mathew J. Denton, Kristen M. Hart, Amanda W.J. Demopoulos, Anton Oleinik, John N. Baldwin
Twenty-six years of post-release monitoring of Florida manatees (Trichechus manatus latirostris): evaluation of a cooperative rehabilitation program Twenty-six years of post-release monitoring of Florida manatees (Trichechus manatus latirostris): evaluation of a cooperative rehabilitation program
The rescue, rehabilitation, and release of Florida manatees (Trichechus manatus latirostris) into the wild has occurred since 1974; however, a comprehensive evaluation of the outcomes of the releases has never been conducted. Herein, we examined data for 136 Florida manatees that were rehabilitated and released with telemetry tags between 1988 and 2013 to determine release outcome of...
Authors
Nicole M. Adimey, Monica Ross, Madison Hall, James P. Reid, Margie E. Barlas, Lucy W Keith Diagne, Robert K. Bonde
Scaling relationships among drivers of aquatic respiration from the smallest to the largest freshwater ecosystems Scaling relationships among drivers of aquatic respiration from the smallest to the largest freshwater ecosystems
To address how various environmental parameters control or constrain planktonic respiration (PR), we used geometric scaling relationships and established biological scaling laws to derive quantitative predictions for the relationships among key drivers of PR. We then used empirical measurements of PR and environmental (soluble reactive phosphate [SRP], carbon [DOC], chlorophyll a [Chl-a)...
Authors
Ed K Hall, Donald R. Schoolmaster, A.M Amado, Edward G. Stets, J.T. Lennon, L. Domaine, J.B. Cotner
Invasive pythons, not anthropogenic stressors, explain the distribution of a keystone species Invasive pythons, not anthropogenic stressors, explain the distribution of a keystone species
Untangling the causes of native species loss in human-modified systems is difficult and often controversial. Evaluating the impact of non-native species in these systems is particularly challenging, as additional human perturbations often precede or accompany introductions. One example is the ongoing debate over whether mammal declines within Everglades National Park (ENP) were caused by...
Authors
Adia R. Sovie, Robert A. McCleery, Robert J. Fletcher, Kristen M. Hart
Management-driven science synthesis: An evaluation of Everglades restoration trajectories Management-driven science synthesis: An evaluation of Everglades restoration trajectories
The Synthesis of Everglades Restoration andEcosystem Services (SERES) Project was funded in 2010 by the U.S. Department of Interior (DOI) through the Critical Ecosystem Studies Initiative (CESI) and established to synthesize the ever-growing body of Everglades scientific information with the goal of addressing topics that have hampered restoration since the Comprehensive Everglades...
Authors
Stephen E Davis, James M. Beerens, Rena R. Borkhataria, Daniel L. Childers, Jay Choi, Steven M Davis, Carl Fitz, Evelyn Gaiser, Hiram Henriquez, Thomas E. Lodge, Judson Harvey, Frank Marshall, Bobby McCormick, Melodie Naja, Todd Osborne, Michael S. Ross, Jay Sah, Joel C. Trexler, Thomas Van Lent, Paul R. Wetzel
Upper bound of abutment scour in laboratory and field data Upper bound of abutment scour in laboratory and field data
The U.S. Geological Survey, in cooperation with the South Carolina Department of Transportation, conducted a field investigation of abutment scour in South Carolina and used those data to develop envelope curves that define the upper bound of abutment scour. To expand on this previous work, an additional cooperative investigation was initiated to combine the South Carolina data with...
Authors
Stephen Benedict
Soil mercury distribution in adjacent coniferous and deciduous stands highly impacted by acid rain in the Ore Mountains, Czech Republic Soil mercury distribution in adjacent coniferous and deciduous stands highly impacted by acid rain in the Ore Mountains, Czech Republic
Forests play a primary role in the cycling and storage of mercury (Hg) in terrestrial ecosystems. This study aimed to assess differences in Hg cycling and storage resulting from different vegetation at two adjacent forest stands - beech and spruce. The study site Načetín in the Czech Republic's Black Triangle received high atmospheric loadings of Hg from coal combustion in the second...
Authors
Tomáš Navrátil, James B. Shanley, Jan Rohovec, Filip Oulehle, Martin Simecek, Jakub Houska, Pavel Cudlin
Viral lysis of photosynthesizing microbes as a mechanism for calcium carbonate nucleation in seawater Viral lysis of photosynthesizing microbes as a mechanism for calcium carbonate nucleation in seawater
Removal of carbon through the precipitation and burial of calcium carbonate in marine sediments constitutes over 70% of the total carbon on Earth and is partitioned between coastal and pelagic zones. The precipitation of authigenic calcium carbonate in seawater, however, has been hotly debated because despite being in a supersaturated state, there is an absence of persistent...
Authors
John T. Lisle, Lisa L. Robbins