Unified Interior Regions

Region 4: Mississippi Basin

Regions L2 Landing Page Tabs

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Year Published: 2020

Microbiology and oxidation-reduction geochemistry of the water-table and Memphis aquifers in the Allen well field, Shelby County, Tennessee

The shallow and Memphis aquifers in Shelby County, Tennessee, are valuable natural resources that are used for domestic, public-supply, and agricultural water use. The Memphis aquifer is the primary source for public supply in West Tennessee and provides 170 to 175 million gallons of water per day for more than 900,000 people (Robinson, 2018). The...

Byl, Thomas D.; Bradley, Michael W.

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Year Published: 2020

Green turtle mitochondrial microsatellites indicate finer-scale natal homing to isolated islands than to continental nesting sites

 In highly mobile philopatric species, defining the scale of natal homing is fundamental to characterizing population dynamics and effectively managing distinct populations. Genetic tools have provided evidence of regional natal philopatry in marine turtles, but extensive sharing of maternally inherited mitochondrial control region (CR)...

Shamblin, Brian M.; Hart, Kristen; Martin, Kelly J.; Ceriani, Simona A.; Bagley, Dean A.; Mansfield, Katherine L.; Ehrhart, Llewellyn M.; Nairn, Campbell J.

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Year Published: 2020

Use of strong habitat–abundance relationships in assessing population status of cryptic fishes: An example using the Harlequin Darter

Understanding trends in abundance is important to fisheries conservation, but techniques for estimating streamwide abundance of cryptic fishes with strong habitat–abundance relationships are not well established and need further development. We developed techniques for addressing this need using the Harlequin Darter Etheostoma histrio, a...

Holcomb, Kathryn M; Schueller, Paul; Jelks, Howard L.; Knight, John R; Allen, Micheal S

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Year Published: 2020

Discovery of a reproducing wild population of the swamp eel Amphipnous cuchia (Hamilton, 1822) in North America

We report discovery of an established population of the Asian swamp eel Amphipnous cuchia (Hamilton, 1822) in Bayou St. John, an urban waterway in New Orleans, Louisiana, USA. This fish, commonly referred to as cuchia (kuchia), is a member of the family Synbranchidae and is native to southern and southeastern Asia. Recently-used synonyms...

Jordan, Frank; Nico, Leo; Huggins, Krystal; Martinat, Peter J.; Martinez, Dahlia A.; Rodrigues, Victoria L.

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Year Published: 2020

Magnitude and frequency of floods in Alabama, 2015

To improve flood-frequency estimates at rural streams in Alabama, annual exceedance probability flows at gaged locations and regional regression equations used to estimate annual exceedance probability flows at ungaged locations were developed by using current geospatial data, new analytical methods, and annual peak-flow data through September...

Anderson, Brandon T.
Anderson, B.T., 2020, Magnitude and frequency of floods in Alabama, 2015: U.S. Geological Survey Scientific Investigations Report 2020–5032, 148 p., https://doi.org/10.3133/sir20205032.

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Year Published: 2020

Disturbances drive changes in coral community assemblages and coral calcification capacity

Anthropogenic environmental change has increased coral reef disturbance regimes in recent decades, altering the structure and function of many coral reefs globally. In this study, we used coral community survey data collected from 1996 to 2015 to evaluate coral calcification capacity (CCC) dynamics with respect to recorded pulse disturbances for...

Courtney, Travis A.; Barnes, Brian B.; Chollett, Iliana; Elahi, Robin; Gross, Kevin; Guest, James R.; Kuffner, Ilsa B.; Lenz, Elizabeth A.; Nelson, Hanna R; Rogers, Caroline; Toth, Lauren T.; Andersson, Andreas J

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Year Published: 2020

Book review: Proceedings of the First International Snakehead Symposium

Snakehead fishes (family Channidae) are among the most maligned aquatic invasive species in the USA and some other countries where they have been introduced outside of their native range in Asia and Africa. Nevertheless, snakeheads continue to be widely exploited in the live‐food trade in aquaculture and wild‐capture fisheries, are highly sought...

Walsh, Stephen

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Year Published: 2020

The incubation environment of nests deposited by a genetically distinct group of loggerhead sea turtles in Northwest Florida

The warming climate presents a challenge to conservation of all threatened and endangered species but particularly to those that exhibit temperature-dependent sex determination such as sea turtles. Changes in temperature may result in changes in the sex ratio of the population which can directly affect reproductive rate, abundance and population...

Lamont, Margaret; Johnson, Darren; Carthy, Raymond

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Year Published: 2020

Modelling grass carp egg transport using a 3-D hydrodynamic river model: The role of egg retention in dead zones on spawning success

Invasive grass carp (Ctenopharyngodon idella) are known to spawn in the Sandusky River, Ohio, USA, within the Great Lakes Basin, and are threatening to expand throughout the Great Lakes. Successful spawning is thought to require that eggs remain in suspension until hatching, which depends on river hydrodynamics and temperature-dependent egg...

Heer, Tej; Wells, Mathew G.; Jackson, P. Ryan; Mandrak, Nicholas E.

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Year Published: 2020

A graphical causal model for resolving species identity effects and biodiversity–ecosystem function correlations

Identifying and clearly communicating the drivers of ecosystem function is a crucially important goal for both basic and applied ecology. This has proven difficult because the putative causes (e.g., environment, species identity, biodiversity, and functional traits) are numerous and correlated. The problem is exacerbated by a lack of a formal...

Schoolmaster, Donald R.; Zirbel, Chad R; Cronin, James P.

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Year Published: 2020

Migration corridors and threats in the Gulf of Mexico and Florida Straits for loggerhead sea turtles

Along migration corridors, animals can face natural and anthropogenic threats that differ from those in breeding and non-breeding residence areas. Satellite telemetry can aid in describing the timing and location of these migrations. We use this tool with switching state-space modeling and line kernel density estimates to identify migration...

Iverson, Autumn; Benscoter, Allison; Fujisaki, Ikuko; Lamont, Margaret; Hart, Kristen

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Year Published: 2020

Groundwater chloride concentrations in domestic wells and proximity to roadways in Vermont, 2011–2018

The Vermont Department of Health and the U.S. Geological Survey analyzed the concentrations of chloride in groundwater samples collected from 4,319 domestic wells across Vermont between 2011 and 2018. Ninety of these wells were sampled twice and the remaining 4,229 were sampled once. This sample size represents approximately 4 percent of all wells...

Levitt, Joseph P.; Larsen, Sille L.
Levitt, J.P., and Larsen, S.L., 2020, Groundwater chloride concentrations in domestic wells and proximity to roadways in Vermont, 2011–2018: U.S. Geological Survey Open-File Report 2019–1148, 12 p., https://doi.org/10.3133/ofr20191148.

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USGS
September 4, 1996

The 350 employees of the U.S. Geological Survey’s Mid-Continent Mapping Center, U.S. Department of the Interior, received Vice President Al Gore’s Hammer Award in Rolla on September 4. The Mid-Continent Mapping Center employees were honored for their team-based approach to streamlining operations and making them more responsive to customers.

USGS
March 25, 1996

A minor earthquake with a preliminary estimated magnitude of 3.5 occurred in Clarke County, Mississippi, at 8:15 local time (9:15 EST) on March 25, according to the U.S. Geological Survey.