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We conduct impartial, multi- and interdisciplinary research and monitoring on a large range of natural-resource issues that impact the quality of life of citizens and landscapes of the Southeastern United States and the Caribbean region.

Filter Total Items: 234
Self-documenting envelope method for quantifying egg mass hatch-out
Date Published: September 15, 2016

Determining the Efficacy of Agricultural Oils for Suppressing Applesnail Egg Mass Hatch-out

Maculata applesnails (Pomacea maculata) are exotic freshwater snails that have been widely introduced along the Gulf of Mexico coast. The snails can significantly impact freshwater macrophytes and reduce the quality of water bodies.

Nutria caught by camera trap at the Dugas Road Landfill, Lafayette LA
Date Published: August 30, 2016
Status: Active

Developing Techniques for Estimating Nutria (Myocastor coypus) Abundance

Nutrias (Myocastor coypus) are an aquatic rodent imported from South America to the United States in the 1920-40’s for the fur farms. Since their original importation they have become established in the wild in many regions of the United States.

Maculata applesnail (Pomacea maculata)
Date Published: August 25, 2016

Movement of Maculata Applesnails in Southern Louisiana Swamps

Maculata applesnails (Pomacea maculata) are exotic freshwater snails that have been widely introduced along the Gulf of Mexico coast. They can significantly impact freshwater macrophytes and reduce water quality.

A genetic analysis illustration
Date Published: August 10, 2016

Molecular Ecology Lab (MEL)

The Molecular Ecology Laboratory applies genetic and genomic technologies to address a variety of complex questions and conservation issues facing the management of the Nation's fish and wildlife resources. Together with our partners, we design and implement studies to document genetic diversity and the distribution of genetic variation among individuals, populations, and species. Information...

Aerial image, Chincoteague NWR boundary
Date Published: August 2, 2016
Status: Active

Assessing Coastal Forest Impacts and Resource Management Implications following Hurricane Sandy

Tropical storms and hurricanes wreak havoc with coastal forests where damage can vary with wind speed and approach from isolated treefalls to wide-area blowdowns of whole forests.

Weighing sturgeon prior to tagging
Date Published: August 1, 2016
Status: Active

Gulf Sturgeon Ecological Investigations

The Gulf sturgeon, Acipenser oxyrinchus desotoi, has been listed as Threatened since 1991. Beginning in 1986, USGS has been investigating sturgeon population abundance and ecology throughout its range, but mostly in the Suwannee River.

Contacts: Michael Randall
Port of the Islands (POI) basin
Date Published: August 1, 2016
Status: Active

Monitoring and Assessing Effects of the Picayune Strand Restoration Project (PSRP) on the Florida Manatee

Critical information predicting condition changes in manatee habitat resulting from the alteration of freshwater flows to estuaries is needed to develop the PSRP Detailed Design and PSRP Operations Plan components and complete consultation under the Endangered Species Act.

Validated modeling and sampling methodology
Date Published: August 1, 2016
Status: Active

Seagrass Beds and Manatee Foraging Areas in the Ten Thousand Islands: Mapping and Characterizing by Incorporating Manatee GPS Tracking Data and Habitat Information

Turbid water conditions make the delineation and characterization of benthic habitats difficult by traditional in situ and remote sensing methods. Consequently, only a small fraction of this valuable resource has been mapped or characterized.

Student Intern Alejandro Grajal-Puche holds an Argentine black and white tegu lizard.
Date Published: July 7, 2016
Status: Active

Ecology and Control of Invasive Reptiles in Florida

This project involves ongoing development of tools for the detection and capture of invasive reptiles in Florida, with an emphasis on Burmese pythons (Python bivittatus) and Black and white tegu lizards (Salvator merianae). The goals are to reduce the risk of reptile invasions in high-value resources such as Everglades National Park and the Florida Keys, to access early detection methods of...

The CWPPRA outreach staff at WARC speaking to a large group
Date Published: June 22, 2016

Coastal Wetlands Planning, Protection and Restoration Act (CWPPRA) Outreach Program

The Coastal Wetlands Planning, Protection and Restoration Act (CWPPRA) is federal legislation enacted in 1990 designed to identify, prepare, and fund construction of coastal wetlands restoration projects.

Contacts: Kathryn Spear
Ornate Chorus Frog, Pseudacris ornata
Date Published: June 17, 2016
Status: Active

Monitoring of Amphibians at St. Marks National Wildlife Refuge in Northwest Florida

Freshwater wetlands provide critical habitat for a diverse array of organisms, including many amphibians. Yet, under the threat of climate change, these habitats are among the most imperiled ecosystems on Earth.

Three pythons well camoflaged
Date Published: June 16, 2016
Status: Active

Statistical Models for the Design and Analysis of Environmental DNA (eDNA) Surveys of Invasive and Imperiled Species

Detecting invasive species at low densities or prior to population establishment is critical for successful control and eradication. For example, Burmese pythons occupy thousands of square kilometers of mostly inaccessible habitats.

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Year Published: 2018

Development of a dual luciferase activity and fluorescamine protein assay adapted to a 384 micro-well plate format: Reducing variability in human luciferase transactivation cell lines aimed at endocrine active substances

There is a need to adapt cell bioassays to 384-well and 1536-well formats instead of the traditional 96-well format as high-throughput screening (HTS) demands increase. However, the sensitivity and performance of the bioassay must be re-verified in these higher micro-well plates, and verification of cell health must also be HT (high-throughput)....

Brennan, Jennifer; Tillitt, Donald E.
Brennan J.C., and Tillitt, D.E., 2018, Development of a dual luciferase activity and fluorescamine protein assay adapted to a 384 micro-well plate format: Reducing variability in human luciferase transactivation cell lines aimed at endocrine active substances: Toxicology in Vitro 47, 18–25

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Year Published: 2018

Range estimates and habitat use of invasive Silver Carp (Hypophthalmichthys molitrix): Evidence of sedentary and mobile individuals

Unregulated rivers provide unobstructed corridors for the dispersal of both native and invasive species. We sought to evaluate range size and habitat use of an invasive species (Silver Carp, Hypophthalmichthys molitrix) in an unimpounded river reach (Wabash River, IN), to provide insights into the dispersal of invasive species and their potential...

Prechtel, Austin R.; Coulter, Alison A.; Etchison, Luke; Jackson, P. Ryan; Goforth, Reuben R.
Prechtel, A.R., Coulter, A.A., Etchison, L. et al. Hydrobiologia (2017). https://doi.org/10.1007/s10750-017-3296-y

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Year Published: 2018

Hydrogeology and simulation of groundwater flow in the Central Oklahoma (Garber-Wellington) Aquifer, Oklahoma, 1987 to 2009, and simulation of available water in storage, 2010–2059

The Central Oklahoma (Garber-Wellington) aquifer underlies about 3,000 square miles of central Oklahoma. The study area for this investigation was the extent of the Central Oklahoma aquifer. Water from the Central Oklahoma aquifer is used for public, industrial, commercial, agricultural, and domestic supply. With the exception of Oklahoma City,...

Mashburn, Shana L.; Ryter, Derek W.; Neel, Christopher R.; Smith, S. Jerrod; Magers, Jessica S.
Mashburn, S.L., Ryter, D.W., Neel, C.R., Smith, S.J., and Magers, J.S., 2018, Hydrogeology and simulation of ground-water flow in the Central Oklahoma (Garber-Wellington) Aquifer, Oklahoma, 1987 to 2009, and simulation of available water in storage, 2010–2059 (ver. 1.1, April 2018): U.S. Geological Survey Scientific Investigations Report 2013–5219, 92 p., https://doi.org/10.3133/sir20135219.

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Year Published: 2017

Potential effects of energy development on environmental resources of the Williston Basin in Montana, North Dakota, and South Dakota—Species of conservation concern: Chapter D in Potential effects of energy development on environmental resources of the Williston Basin in Montana, North Dakota, and South Dakota

The ecosystems of the Williston Basin provide direct and indirect benefits to society. These benefits include carbon sequestration, flood control, nutrient rich soils for agricultural productivity, and habitat for wildlife. This chapter’s main focus is on the effects of energy development on species that occupy the ecosystems in the Williston...

Post van der Burg, Max; Symstad, Amy J.; Igl, Lawrence D.; Mushet, David M.; Larson, Diane L.; Sargeant, Glen A.; Harper, David D.; Farag, Aïda M.; Tangen, Brian A.; Anteau, Michael J.
Post van der Burg, Max, Symstad, A.J., Igl, L.D., Mushet, D.M., Larson, D.L., Sargeant, G.A., Harper, D.D., Farag, A.M., Tangen, B.A., and Anteau, M.J., 2017, Potential effects of energy development on environmental resources of the Williston Basin in Montana, North Dakota, and South Dakota—Species of conservation concern: U.S. Geological Survey Scientific Investigations Report 2017–5070–D, 41 p., https://doi.org/10.3133/sir20175070D.

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Year Published: 2017

CYP1A protein expression and catalytic activity in double-crested cormorants experimentally exposed to Deepwater Horizon Mississippi Canyon 252 oil

Double-crested cormorants (Phalacrocorax auritus, DCCO) were orally exposed to Deepwater Horizon Mississippi Canyon 252 (DWH) oil to investigate oil-induced toxicological impacts. Livers were collected for multiple analyses including cytochrome P4501A (CYP1A) enzymatic activity and protein expression. CYP1A enzymatic activity was measured by...

Alexander, Courtney R.; Hooper, Michael J.; Cacela, Dave; Smelker, Kim D.; Calvin, Caleshia S.; Dean, Karen M.; Bursian, Steve J.; Cunningham, Fred L.; Hanson-Dorr, Katie C.; Horak, Katherine E.; Isanhart, John P.; Link, Jane E.; Shriner, Susan A.; Godard-Codding, Céline A.J.
Alexander, C.R., Hooper, M.J., Cacela, D., Smelker, K.D., Calvin, C.S., Dean, K.M., Bursian, S.J., Cunningham, F.L., Hanson-Dorr, K.C., Horak, K.E., Isanhart, J.P., Link, J., Shriner, S.A., and Godard-Codding, C.A.J., 2017, Reprint of: CYP1A protein expression and catalytic activity in double-crested cormorants experimentally exposed to Deepwater Horizon Mississippi Canyon 252 oil, Ecotoxicology and Environmental Safety, v. 146, p. 68-75

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Year Published: 2017

The thermal regime and species composition of fish and invertebrates in Kelly Warm Spring, Grand Teton National Park, Wyoming

We evaluated the thermal regime and relative abundance of native and nonnative fish and invertebrates within Kelly Warm Spring and Savage Ditch, Grand Teton National Park, Wyoming. Water temperatures within the system remained relatively warm year-round with mean temperatures >20 °C near the spring source and >5 °C approximately 2 km...

Harper, David; Farag, Aida
Harper, D.D., and Farag, A.M., 2017, The thermal regime and species composition of fish and invertebrates in Kelly Warm Spring, Grand Teton National Park, Wyoming, Western North American Naturalist v. 77, no. 4, p. article 4

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Year Published: 2017

Water quality, sources of nitrate, and chemical loadings in the Geronimo Creek and Plum Creek watersheds, south-central Texas, April 2015–March 2016

Located in south-central Texas, the Geronimo Creek and Plum Creek watersheds have long been characterized by elevated nitrate concentrations. From April 2015 through March 2016, an assessment was done by the U.S. Geological Survey, in cooperation with the Guadalupe-Blanco River Authority and the Texas State Soil and Water Conservation Board, to...

Lambert, Rebecca B.; Opsahl, Stephen P.; Musgrove, MaryLynn
Lambert, R.B., Opsahl, S.P., and Musgrove, MaryLynn, 2017, Water quality, sources of nitrate, and chemical loadings in the Geronimo Creek and Plum Creek watersheds, south-central Texas, April 2015–March 2016: U.S. Geological Survey Scientific Investigations Report 2017–5121, 49 p., https://doi.org/10.3133/sir20175121.

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Year Published: 2017

First evidence of bighead carp wild recruitment in Western Europe, and its relation to hydrology and temperature

Bighead carp (Hypophthalmichthys nobilis) have been introduced throughout Europe, mostly unintentionally, and little attention has been given to their potential for natural reproduction. We investigated the presence of young-of-the-year bighead carp in an irrigation canal network of Northern Italy and the environmental conditions associated with...

Milardi, Marco; Chapman, Duane C.; Long, James M.; Castaldelli, Giuseppe
Milardi, M., Chapman, D.C., Lanzoni, M., Long, J.M., and Castaldelli, G., 2017, First evidence of bighead carp wild recruitment in Western Europe, and its relation to hydrology and temperature: PLoS ONE 12(12): e0189517

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Year Published: 2017

Contaminant gradients in trees: Directional tree coring reveals boundaries of soil and soil-gas contamination with potential applications in vapor intrusion assessment

Contaminated sites pose ecological and human-health risks through exposure to contaminated soil and groundwater. Whereas we can readily locate, monitor, and track contaminants in groundwater, it is harder to perform these tasks in the vadose zone. In this study, tree-core samples were collected at a Superfund site to determine if the sample-...

Wilson, Jordan L.; Samaranayake, V.A.; Limmer, Matthew A.; Schumacher, John G.; Burken, Joel G.
Wilson, J.L., Samaranayake, V.A., Limmer, M.A., Schumacher, J.G., Burken, J.G., 2017, Contaminant Gradients in Trees: Directional Tree Coring Reveals Boundaries of Soil and Soil-Gas Contamination with Potential Applications in Vapor Intrusion Assessment: Environmental Science and Technology, Just Accepted Manuscript. DOI: 10.1021/acs.est.7b03466.

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Year Published: 2017

Metabarcoding of environmental DNA samples to explore the use of uranium mine containment ponds as a water source for wildlife

Understanding how anthropogenic impacts on the landscape affect wildlife requires a knowledge of community assemblages. Species surveys are the first step in assessing community structure, and recent molecular applications such as metabarcoding and environmental DNA analyses have been proposed as an additional and complementary wildlife survey...

Klymus, Katy E.; Richter, Catherine A.; Thompson, Nathan; Hinck, Jo Ellen
Klymus, K., Richter, C., Thompson, N., and Hinck, J., 2017, Metabarcoding of Environmental DNA Samples to Explore the Use of Uranium Mine Containment Ponds as a Water Source for Wildlife: Diversity, v. 9, no. 4, 54

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Year Published: 2017

Overview of avian toxicity studies for the Deepwater Horizon Natural Resource Damage Assessment

The Oil Pollution Act of 1990 establishes liability for injuries to natural resources because of the release or threat of release of oil. Assessment of injury to natural resources resulting from an oil spill and development and implementation of a plan for the restoration, rehabilitation, replacement or acquisition of natural resources to...

Bursian, Steven J.; Alexander, C.R.; Cacela, Dave; Cunningham, Fred L.; Dean, Karen M.; Dorr, Brian S.; Ellis, Christine K.; Godard-Codding, Céline A.J.; Guglielmo, Christopher G.; Hanson-Dorr, Katie C.; Harr, Kendall E.; Healy, Katherine A.; Hooper, Michael J.; Horak, Katherine E.; Isanhart, John P.; Kennedy, Lisa V.; Link, Jane E.; Maggini, Ivan; Moye, John K.; Perez, Christina R.; Pritsos, Chris A.; Shriner, Susan A.; Trust, Kinberly A.; Tuttle, Peter L.
Bursian, S.J., Alexander, C.R., Cacela, D., Cunningham, F.L., Dean, K.M., Dorr, B.S., Ellis, C.K., Godard-Codding, C.A., Guglielmo, C.G., Hanson-Dorr, K.C., Harr, K.E., Healy, K.A., Hooper, M.J., Horak, K.E., Isanhart, J.P., Kennedy, L.V., Link, J.E., Maggini, I., Moye, J.K., Perez, C.R., Pritsos, C.A., Shriner, S.A., Trust, K.A., and Tuttle, P.L., 2017, Reprint of: Overview of avian toxicity studies for the Deepwater Horizon Natural Resource Damage Assessment, Ecotoxicology and Environmental Safety, v. 146, p. 4-10

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Year Published: 2017

Estimating virus occurrence using Bayesian modeling in multiple drinking water systems of the United States

Drinking water treatment plants rely on purification of contaminated source waters to provide communities with potable water. One group of possible contaminants are enteric viruses. Measurement of viral quantities in environmental water systems are often performed using polymerase chain reaction (PCR) or quantitative PCR (qPCR). However, true...

Varughese, Eunice A.; Brinkman, Nichole E; Anneken, Emily M; Cashdollar, Jennifer S; Fout, G. Shay; Furlong, Edward T.; Kolpin, Dana W.; Glassmeyer, Susan T.; Keely, Scott P
Varughese, E.A., Brinkman, N.E., Anneken, E.M., Cashdollar, J.L., Shay Fout, G., Furlong, E.T., Kolpin, D.W., Glassmeyer, S.T., Keely, S.P. 2018. Estimating virus occurrence using Bayesian modeling in multiple drinking water systems of the United States. Sci. Total Environ. v. 619-620, p. 1330-1339.

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Coastal wetlands near Port Fourchon, Louisiana, in the northern Gulf of Mexico
December 31, 2013

Coastal wetlands near Port Fourchon, La., Northern Gulf of Mexico

To understand how changes in rainfall and temperature might affect coastal wetlands in the northern Gulf of Mexico, USGS researchers conducted field studies at 10 estuaries in five states (Texas, Louisiana, Mississippi, Alabama, and Florida). The fieldwork took place in a variety of coastal wetland types, including mangroves, marshes, and salt flats.

Wading birds feed near wooden posts marking a research site in a Louisiana salt marsh
December 31, 2013

Wading birds feed at a study site in a Louisiana coastal salt marsh

To understand how changes in rainfall and temperature might affect coastal wetlands in the northern Gulf of Mexico, USGS researchers conducted field studies at 10 estuaries in five states (Texas, Louisiana, Mississippi, Alabama, and Florida). The fieldwork took place in a variety of coastal wetland types, including mangroves, marshes, and salt flats. At this site in Port

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Aerial view of coastal marshes along Bayou Dufrene in Louisiana
September 12, 2012

Louisiana's changing coastal wetlands

An aerial view of coastal marshes along Bayou Dufrene, southwest of the town of Dulac in Louisiana's Terrebonne Basin.

A large boulder-shaped Massive Starlet coral on the sea floor in Dry Tortugas National Park
May 31, 2012

Massive Starlet coral at Dry Tortugas National Park

Scientists used a core from this Massive Starlet (Siderastrea siderea) coral colony in Dry Tortugas National Park to reconstruct ocean temperatures going back to 1837. Photo: USGS

Oblique aerial photograph near Rodanthe, NC, looking south along the coast on August 30, 2011, three days after landfall of Hurr
August 30, 2011

Oblique aerial photograph near Rodanthe, North Carolina, Aug. 30, 2011

Oblique aerial photograph near Rodanthe, North Carolina, looking south along the coast on August 30, 2011, three days after landfall of Hurricane Irene. 

Brain corals, mangrove prop roots and squirrelfish
December 31, 2009

Corals and mangroves share clear waters

Sediment can smother corals, but Hurricane Hole has no sediment-bearing freshwater streams. Its clear waters are habitat for an entire community of marine life, including Montastrea corals and squirrelfish. Photo: Caroline Rogers, USGS, 2009

cientists collecting bed-sediment samples from Suwanee Creek, Georgia
May 23, 2007

Scientists Collecting Bed-Sediment Samples from Suwanee Creek, Georgia

U.S. Geological Survey (USGS) scientists collecting bed-sediment samples from Suwanee Creek, Gwinnett County, Georgia, on May 23, 2007. 

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Photo of a temporary streamgage installed by the USGS on the Brazos River near West Columbia, Texas.
June 1, 2016

Reporters: Do you want to interview USGS scientists as they measure flooding? Please contact Jennifer LaVista.

Texas Water Dashboard map showing streamflow and weather conditions for May 27, 2016.
May 27, 2016

Reporters: Do you want to interview USGS scientists as they measure flooding? Please contact Jennifer LaVista.

USGS science for a changing world logo
March 14, 2016

The U.S. Geological Survey has created 20 new flood inundation maps that can help South Carolinians take steps to prevent or reduce future flood damage in the areas affected by the widespread floods of October 2015.

A juvenile Broad-banded Watersnake that tested positive for snake fungal disease (SFD) exhibiting ulceration of the skin.
March 1, 2016

Snake fungal disease, or SFD, a disease causing high mortality rates in some species of snakes, has been found in Louisiana for the first time, according to a new study by U.S. Geological Survey scientists. SFD now has been confirmed in at least 16 states in the Eastern and Midwestern United States.

USGS
January 15, 2016

Significant flood peaks occurred across the Arkansas, White and Red River Basins in Arkansas beginning on Dec. 26 and the rivers are still high, according to the U.S. Geological Survey.

Hydrograph of White River at Augusta, Arkansas, December 24-31, 2015. Left side shows Gage height 31-36 feet. Bottom is days.
December 31, 2015

Heavy rainfall of up to 10 inches in northern and western Arkansas that fell during the Christmas weekend is still causing major flooding in some areas.

USGS
December 29, 2015

Since Saturday morning, parts of eastern Oklahoma received up to 12 inches of rain from Winter Storm Goliath. Water levels at many U.S. Geological Survey gages in that part of the state were already high due to previous rains.

USGS
November 18, 2015

U.S. Geological Survey field crews are measuring flooding on rivers and streams across central and southern Missouri.

USGS
November 17, 2015

Fact sheets that detail information about parish water resources and water-use are available online for 34 of the state’s 64 parishes, with more coming soon.