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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
September 15, 2016

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
August 30, 2016

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)
August 25, 2016

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
August 10, 2016

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
August 2, 2016

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
August 1, 2016

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.

Port of the Islands (POI) basin
August 1, 2016

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
August 1, 2016

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.
July 7, 2016

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
June 22, 2016

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.

Ornate Chorus Frog, Pseudacris ornata
June 17, 2016

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
June 16, 2016

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.

Filter Total Items: 180
Year Published: 2016

Effects of salinity and flooding on post-hurricane regeneration potential in coastal wetland vegetation

PREMISE OF THE STUDY: The nature of regeneration dynamics after hurricane flooding and salinity intrusion may play an important role in shaping coastal vegetation patterns. METHODS: The regeneration potentials of coastal species, types and gradients (wetland types from seaward to landward) were studied on the Delmarva Peninsula after Hurricane...

Middleton, Beth A.
Middleton, B.A., 2016, Effects of salinity and flooding on post-hurricane regeneration potential in coastal wetland vegetation: American Journal of Botany, Online Early, http://dx.doi.org/10.3732/ajb.1600062.

Year Published: 2016

Book review: Black bass diversity: Multidisciplinary science for conservation

These proceedings are from the third symposium dedicated to management and conservation of black basses in the genus Micropterus. The first symposium was held in 1975 (R. H. Stroud and H. Clepper. Black Bass Biology and Management. Washington (DC): Sport Fishing Institute) followed 25 years later by Black Bass 2000 (D. P. Philipp and M. S. Ridgway...

Jelks, Howard

Year Published: 2016

Early life history and spatiotemporal changes in distribution of the rediscovered Suwannee moccasinshell Medionidus walkeri (Bivalvia: Unionidae)

Accurate distribution data are critical to the development of conservation and management strategies for imperiled species, particularly for narrow endemics with life history traits that make them vulnerable to extinction. Medionidus walkeri is a rare freshwater mussel endemic to the Suwannee River Basin in southeastern North America....

Johnson, Nathan A.; Mcleod, John; Holcomb, Jordan; Rowe, Matthew T.; Williams, James D.
Johnson, N.A., McLeod, J.M., Holcomb, J., Rowe, M., and Williams, J.D., 2016, Early life history and spatiotemporal changes in distribution of the rediscovered Suwannee moccasinshell, Medionidus walkeri (Bivalvia: Unionidae): Inter-Research Endangered Species Research, ESR Prepress Abstract, http://dx.doi.org/10.3354/esr00752.

Year Published: 2016

Broken connections of wetland cultural knowledge

As global agriculture intensifies, cultural knowledge of wetland utilization has eroded as natural resources become more stressed, and marginal farmers move away from the land. The excellent paper by Fawzi et al. (2016) documents a particularly poignant case of traditional knowledge loss among the Marsh Arab women of Iraq. Through interviews, the...

Middleton, Beth A.
Middleton, B.A., 2016, Broken connections of wetland cultural knowledge [Comment]: Ecosystem Health and Sustainability, v. 2, no. 7, art. e01223, http://dx.doi.org/10.1002/ehs2.1223.

Year Published: 2016

Barriers to and opportunities for landward migration of coastal wetlands with sea-level rise

In the 21st century, accelerated sea-level rise and continued coastal development are expected to greatly alter coastal landscapes across the globe. Historically, many coastal ecosystems have responded to sea-level fluctuations via horizontal and vertical movement on the landscape. However, anthropogenic activities, including urbanization and the...

Enwright, Nicholas M.; Griffith, Kereen T.; Osland, Michael J.

Year Published: 2016

Effects of diffusion on total biomass in heterogeneous continuous and discrete-patch systems

Theoretical models of populations on a system of two connected patches previously have shown that when the two patches differ in maximum growth rate and carrying capacity, and in the limit of high diffusion, conditions exist for which the total population size at equilibrium exceeds that of the ideal free distribution, which predicts that the...

DeAngelis, Don; Ming Ni, Wei; Zhang, Bo
DeAngelis, D.L, Ni, W.-M., and Zhang, B., 2016, Effects of diffusion on total biomass in heterogeneous continuous and discrete-patch systems: Theoretical Ecology, Online Early, 11 p., http://dx.doi.org/10.​1007/​s12080-016-0302-3 or http://link.springer.com/article/10.1007/s12080-016-0302-3.

Year Published: 2016

The structure and composition of Holocene coral reefs in the Middle Florida Keys

The Florida Keys reef tract (FKRT) is the largest coral-reef ecosystem in the continental United States. The modern FKRT extends for 362 kilometers along the coast of South Florida from Dry Tortugas National Park in the southwest, through the Florida Keys National Marine Sanctuary (FKNMS), to Fowey Rocks reef in Biscayne National Park in the...

Toth, Lauren T.; Stathakopoulos, Anastasios; Kuffner, Ilsa B.
Toth, L.T., Stathakopoulos, Anastasios, and Kuffner, I.B., 2016, The structure and composition of Holocene coral reefs in the Middle Florida Keys: U.S. Geological Survey Open-File Report 2016–1074, 27 p., http://dx.doi.org/10.3133/ofr20161074.

Year Published: 2016

Spatial and temporal variability in estuary habitat use by American alligators

Estuarine habitat occupied by Alligator mississippiensis, a primarily freshwater species, is spatially and temporally heterogeneous largely due to a salinity gradient that fluctuates. Using long-term night light survey data, we examined seasonal patterns in alligators’ habitat use by size classes in midstream and downstream estuary...

Fujisaki, Ikuko; Hart, Kristen M.; Cherkiss, Michael S.; Mazzotti, Frank J.; Beauchamp, Jeffrey S.; Jeffery, Brian M.; Brandt, Laura A.

Year Published: 2016

Can you hear me now? Range-testing a submerged passive acoustic receiver array in a Caribbean coral reef habitat

Submerged passive acoustic technology allows researchers to investigate spatial and temporal movement patterns of many marine and freshwater species. The technology uses receivers to detect and record acoustic transmissions emitted from tags attached to an individual. Acoustic signal strength naturally attenuates over distance, but numerous...

Selby, Thomas H.; Hart, Kristen M.; Fujisaki, Ikuko; Smith, Brian J.; Pollock, Clayton J; Hillis-Star, Zandy M; Lundgren, Ian; Oli, Madan K.
Selby, T.H., Hart, K.M., Fujisaki, I., Smith, B.J., Pollock, C.J., Hillis-Staff, Z., Lundgren, I., and Oli, M.K., 2016, Can you hear me now? Range-testing a submerged passive acoustic receiver array in a Caribbean coral reef habitat: Ecology and Evolution, Early View, http://dx.doi.org/10.1002/ece3.2228.

Year Published: 2016

Betrayal: radio-tagged Burmese pythons reveal locations of conspecifics in Everglades National Park

The “Judas” technique is based on the idea that a radio-tagged individual can be used to “betray” conspecifics during the course of its routine social behavior. The Burmese python (Python bivittatus) is an invasive constrictor in southern Florida, and few methods are available for its control. Pythons are normally solitary...

Smith, Brian J.; Cherkiss, Michael S.; Hart, Kristen M.; Rochford, Michael R.; Selby, Thomas H.; Snow, Ray W; Mazzotti, Frank J.

Year Published: 2016

Processes contributing to resilience of coastal wetlands to sea-level rise

The objectives of this study were to identify processes that contribute to resilience of coastal wetlands subject to rising sea levels and to determine whether the relative contribution of these processes varies across different wetland community types. We assessed the resilience of wetlands to sea-level rise along a transitional gradient from...

Stagg, Camille L.; Krauss, Ken W.; Cahoon, Donald R.; Cormier, Nicole; Conner, William H.; Swarzenski, Christopher M.
Stagg, C.L., Krauss, K.W., Cahoon, D.R., Cormier, N., Conner, W.H., and Swarzenski, C.M., 2016, Processes contributing to resilience of coastal wetlands to sea-level rise: Ecosystems, First Online, 15 p., http://dx.doi.org/10.1007/s10021-016-0015-x.

Year Published: 2016

Using Cape Sable seaside sparrow distribution data for water management decision support

The Cape Sable Seaside Sparrow (Ammodramus maritimus mirabilis; hereafter sparrow) is endemic to south Florida and a key indicator species of marl prairie, the most diverse freshwater community in the Florida Everglades. Marl prairie habitat is shaped by intermediate levels of disturbances such as flooding, drying, and fire, which maintain...

Beerens, James M.; Romanach, Stephanie
Beerens, J.M., and Romanach, S.S., 2016, Using Cape Sable seaside sparrow distribution data for water management decision support, prepared for the U.S.Fish and Wildlife Service, Cape Sable Seaside Sparrow Biological Opinion, U.S. Geological Survey, 19 pp.

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Wading birds feed near wooden posts marking a research site in a Louisiana salt marsh
2013 (approx.)
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 Fourchon, Louisiana,...
Aerial view of coastal marshes along Bayou Dufrene in Louisiana
September 12, 2012
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
2012 (approx.)
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, looking south along the coast on August 30, 2011, three days after landfall of Hurricane Irene.
Brain corals, mangrove prop roots and squirrelfish
2009 (approx.)
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
U.S. Geological Survey (USGS) scientists collecting bed-sediment samples from Suwanee Creek, Gwinnett County, Georgia, on May 23, 2007.
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USGS science for a changing world logo
February 27, 2014

The estimated tens of thousands of Burmese pythons now populating the Everglades present a low risk to people in the park, according to a new assessment byU.S. Geological Survey and National Park Service scientists.

USGS science for a changing world logo
February 6, 2014

A newly developed computer model holds the promise of helping scientists track and predict where oil will go after a spill, sometimes years later.