Unified Interior Regions

Region 4: Mississippi Basin

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Filter Total Items: 4,143
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Year Published: 2019

Morphology and genetics of Lythrum salicaria from latitudinal gradients of the Northern Hemisphere grown in cold and hot common gardens

The aim of this project was to compare the phenotypic responses of global populations of Lythrum salicaria in cold/dry and hot/humid environments to determine if phenotypic plasticity varied between the native and invasive ranges, and secondarily if this variation was linked to genetic diversity. Common garden studies were conducted in...

Middleton, Beth A.; Travis, Steven E.; Kubátová, Barbora; Johnson, Darren; Edwards, Keith R.

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Year Published: 2019

West Florida shelf pipeline serves as sea turtle benthic habitat based on in-situ towed camera observations

The use of marine offshore benthic habitats by sea turtles is poorly characterized due to the difficulty of obtaining in situ data. Understanding benthic habitat use that is important to the species’ reproduction, foraging, and migrations is critical for guiding management decisions. A towed camera-based assessment survey system (C-BASS) equipped...

Broadbent, Heather A.; Grasty, Sarah E.; Hardy, Robert F.; Lamont, Margaret M.; Hart, Kristen M.; Lembke, Chad; Brizzolara, Jennifer L.; Murawski, Steven A.

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Year Published: 2019

Behavioral effects of copper on larval white sturgeon

Early–life stage white sturgeon are sensitive to copper (Cu), with adverse behavioral responses observed during previous studies. The objectives of the present study were to quantify the effects of Cu exposure on white sturgeon swimming and feeding behaviors and determine their time to response. Larval sturgeon (1–2, 28, or 35 d posthatch [dph])...

Puglis, Holly J.; Calfee, Robin D.; Little, Edward E.

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Year Published: 2019

Simulating runoff quality with the highway-runoff database and the Stochastic Empirical Loading and Dilution Model

Stormwater practitioners need quantitative information about the quality and volume of highway runoff to assess and mitigate potential adverse effects of runoff on the Nation’s receiving waters. The U.S. Geological Survey developed the Highway Runoff Database (HRDB) in cooperation with the FHWA to provide practice-ready information to meet these...

Granato, Gregory E.; Jones, Susan C.

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Year Published: 2019

Patterning emergent marsh vegetation assemblages in coastal Louisiana, USA, with unsupervised artificial neural networks

QuestionAre self‐organizing maps (SOMs) useful for patterning coastal wetland vegetation communities? Do SOMs provide robust alternatives to traditional classification methods, particularly when underlying species response functions are unknown or difficult to approximate, or when a need exists to continuously classify new samples obtained under...

Snedden, Gregg A.

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Year Published: 2019

Satellite tracking of hawksbill turtles nesting at Buck Island Reef National Monument, US Virgin Islands: Inter-nesting and foraging period movements and migrations

To conserve imperiled marine species, an understanding of high-density use zones is necessary prior to designing and evaluating management strategies that improve their survival. We satellite-tracked turtles captured after nesting at Buck Island ReefNational Monument (BIRNM), St. Croix, US...

Hart, Kristen M.; Iverson, Autumn; Benscoter, Allison; Fujisaki, Ikuko; Cherkiss, Michael S.; Pollock, Clayton; Lundgren, Ian; Hillis-Starr, Zandy

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Year Published: 2019

The shifting saltmarsh-mangrove ecotone in Australasia and the Americas

Mangroves and saltmarshes coexist in the intertidal wetlands of many temperate and subtropical coastlines. In these settings, mangroves may be close to physiological limits of tolerance in relation to a range of environmental variables, including temperature, salinity, aridity, and inundation frequency. Changes in the distribution of mangrove and...

Saintilan, Neil; Rogers, Kerrylee; McKee, Karen L.

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Year Published: 2019

Polychlorinated biphenyl tissue‐concentration thresholds for survival, growth, and reproduction in fish

Polychlorinated biphenyls (PCBs) have left a legacy of environmental contamination. Even though they were banned from production and active use in the 1970s, they persist in the environment and still have the potential to impact aquatic life. Our objective was to identify data from controlled laboratory studies of PCB‐related adverse effects in...

Berninger, Jason P.; Tillitt, Donald E.

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Year Published: 2019

Energetic constraints and the paradox of a diffusing population in a heterogeneous environment

Previous mathematical analyses have shown that, for certain parameter ranges, a population, described by logistic equations on a set of connected patches, and diffusing among them, can reach a higher equilibrium total population when the local carrying capacities are heterogeneously distributed across patches, than when carrying capacities having...

Wang, Yuanshi; DeAngelis, Donald L.

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Year Published: 2019

Pulsed salmonfly emergence and its potential contribution to terrestrial detrital pools

Adult aquatic insects are a globally important subsidy in terrestrial food webs. However, our understanding of their importance is largely limited to studies that measure predation of live insects by terrestrial predators. Yet the flux of adult aquatic insects to terrestrial detrital pools may also be an important...

Wesner, Jeff; Walters, David; Zuellig, Robert E.

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Year Published: 2019

Water-quality trends in US rivers: Exploring effects from streamflow trends and changes in watershed management

We present a conceptual model that explores the relationship of streamflow trends to 15 water-quality parameters at 370 sites across the contiguous United States (US). Our analytical framework uses discrete water-quality data, daily streamflow records, and a statistical model to estimate water-quality trends between...

Murphy, Jennifer C.; Sprague, Lori A.

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Year Published: 2019

Optimal spatial allocation of control effort to manage invasives in the face of imperfect detection and misclassification

Imperfect detection and misclassification errors are often ignored in the context of invasive species management. Here we present an approach that combines spatially explicit models and an optimization technique to design optimal search and destroy strategies based on noisy monitoring observations. We focus on two invasive plants, melaleuca (...

Bonneau, Mathieu; Martin, Julien; Peyrard, Nathalie; Rodgers, LeRoy; Romagosa, Christina M.; Johnson, Fred

Filter Total Items: 243
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.

USGS
November 2, 1995

Patterns of sediment deposition near the mouth of the Mississippi River, traveling tar balls and the evolution of ancient marine lobsters into today’s Louisiana crayfish are a sampling of some of the earth-science topics that will be presented by scientists from the U.S. Geological Survey during a national science meeting in New Orleans next week.

USGS
June 9, 1995

Dr. Max M. Ethridge has been appointed Chief of the U.S. Geological Survey’s Mid-Continent Mapping Center in Rolla, Missouri.