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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
Sea Turtle Habitat Use at Buck Island Reef National Monument, U.S. Virgin Islands
Date Published: February 26, 2016
Status: Active

Sea Turtle Habitat Use at Buck Island Reef National Monument, U.S. Virgin Islands

USGS researchers tag and track endangered and threatened sea turtles to inform adaptive management strategies in marine protected areas.

Predicting Vulnerability of Southeastern Sea Turtle Nesting Beaches to Climate Change
Date Published: February 26, 2016
Status: Active

Predicting Vulnerability of Southeastern Sea Turtle Nesting Beaches to Climate Change

Climate change may reduce the suitability of nesting and foraging habitat used by federally threatened and endangered species, like the Loggerhead sea turtle.

Spatial Ecology of the American Crocodile and American Alligator in the Greater Everglades
Date Published: February 26, 2016
Status: Active

Spatial Ecology of the American Crocodile (Crocodylus acutus) and American Alligator (Alligator mississippiensis) in the Greater Everglades

Satellite/GPS tags help USGS researchers understand the movements of American Alligators and American Crocodiles in the Greater Everglades.

Bartram’s hairstreak butterfly - WARC
Date Published: February 25, 2016
Status: Completed

Mosquito Control Pesticide Impacts to Butterflies: Implications for Imperiled Butterfly Conservation on a National Wildlife Refuge

USGS researchers evaluate the impact of a pesticide on two imperiled butterfly species in the Florida Keys.

Mosquitofish (Gambusia holbrooki) in Tanks - WARC
Date Published: February 25, 2016

Methylmercury Impacts to Reproduction in the Eastern Mosquitofish (Gambusia holbrooki)

USGS researchers investigate the effects of methylmercury contamination on reproduction of the Eastern mosquitofish, a common fish in South Florida.

Frosted flatwoods salamander
Date Published: February 2, 2016
Status: Active

Adaptive Habitat Conservation for Flatwoods Salamanders

USGS scientists investigate adaptive habitat conservation for Flatwoods salamanders.

Grass Carp, Ctenopharyngodon idella
Date Published: November 3, 2015
Status: Completed

Fish Slam 2015

November 3, 2015 – Five teams of fishery biologists from the U.S. Geological Survey (USGS), U.S. Fish and Wildlife Service (USFWS), Florida Fish and Wildlife Conservation Commission (FWC), the National Park Service (NPS), and Florida International University (FIU) sampled for non-native fishes in canals, ponds and ditches in and around the Plantation/Davie area of Broward County, FL.

Roughtongue Reef Map
Date Published: September 1, 2015

Natural Resource Disaster Assessment (NRDA): Mesophotic Reef Investigations Post-DWH Event

A series of ROV cruises was proposed to survey selected reefs for fish and soft coral diversity.

Evaluating the Prevalence of the Amphibian Chytrid Fungus, Batrachochytrium dendrobatidis, in the Southeastern U.S.: Any Evidenc
Date Published: April 17, 2015
Status: Active

Evaluating the Prevalence of the Amphibian Chytrid Fungus, Batrachochytrium dendrobatidis, in the Southeastern U.S.: Any Evidence of Disease-Related Population Declines?

Pathogens and infectious disease play a role in some recent species extinctions and are likely to impact biodiversity in the future. Environmental DNA - eDNA - is coupled with traditional amphibian sampling methods to determine the distribution and prevalence of the amphibian chytrid fungus, also known as Bd, in the southeastern US. 

A Decision Support Tool for Repatriation of Aquatic Fauna: A Case Study Involving the Striped Newt (Notophthalmus perstriatus) a
Date Published: April 17, 2015
Status: Completed

A Decision Support Tool for Repatriation of Aquatic Fauna: A Case Study Involving the Striped Newt (Notophthalmus perstriatus) at St. Marks National Wildlife Refuge, Florida

The Striped Newt is a small salamander found in xeric habitats (e.g., scrub, sandhill, dry flatwoods) of the lower coastal plain and northern peninsular Florida. Though once considered "common," they are currently a candidate species for federal listing. 

Typical habitats sampled during the Fish Slam
Date Published: November 14, 2014
Status: Completed

Fish Slam 2014

On November 20, 2014, eight teams of fishery biologists from the U.S. Geological Survey (USGS), U.S. Fish and Wildlife Service (USFWS), Florida Fish and Wildlife Conservation Commission (FWC), U.S. National Park Service (NPS), and Florida International University (FIU) gathered for a one-day sampling event to collect non-native fishes from canals, ponds and ditches in Miami-Dade County, FL....

Mobile River Basin Chart
Date Published: September 22, 2014
Status: Active

Mobile River Basin Study Design

The Mobile River Basin study is one of several NAWQA studies that began in Federal fiscal year 1997 (October 1996). Study planning and design, and analysis of existing data will be done during the first 2 years, which is consistent with all NAWQA studies. After the 2-year planning period, surface- and ground-water and biological data will be collected intensively for 3 years during a high-...

Filter Total Items: 3,035
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Year Published: 2017

Extinction debt as a driver of amphibian declines: An example with imperiled flatwoods salamanders

A comprehensive view of population declines and their underlying causes is necessary to reverse species loss. Historically, in many cases, a narrow view may have allowed species declines to continue, virtually undetected, for long periods of time (perhaps even decades). We suggest that extinction debt is likely responsible for numerous (perhaps...

Semiltsch, Raymond D; Walls, Susan C.; Barichivich, William J.; O'Donnell, Katherine
Semlitsch, R.D., Walls, S.C., Barichivich, W.J., and O'Donnell, K.M., 2016, Extinction debt as a driver of amphibian declines: an example with imperiled flatwoods salamanders: Journal of Herpetology, Online Ahead of Print, http://dx.doi.org/10.1670/16-090 or http://journalofherpetology.org/doi/abs/10.1670/16-090?journalCode=hpet.

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Year Published: 2017

Development of the oriental latrine fly, Chrysomya megacephala (Diptera: Calliphoridae), at five constant temperatures

Chrysomya megacephala (Fabricius) is a forensically important fly that is found throughout the tropics and subtropics. We calculated the accumulated development time and transition points for each life stage from eclosion to adult emergence at five constant temperatures: 15, 20, 25, 30, and 35 °C. For each transition, the 10th, 50th, and 90th...

Gruner, S. V.; Slone, D.H.; Capinera, J.L.; Turco, M. P.
Gruner, S.V., Slone, D.H., Capinera, J.L., and Turco, M.P., 2016, Development of the oriental latrine fly, Chrysomya megacephala (Diptera: Calliphoridae), at five constant temperatures: Journal of Medical Entomology, First Online, http://dx.doi.org/10.1093/jme/tjw169.

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Year Published: 2017

Detection limits of quantitative and digital PCR assays and their influence in presence-absence surveys of environmental DNA

A set of universal guidelines is needed to determine the limit of detection (LOD) in PCR-based analyses of low concentration DNA. In particular, environmental DNA (eDNA) studies require sensitive and reliable methods to detect rare and cryptic species through shed genetic material in environmental samples. Current strategies for assessing...

Hunter, Margaret; Dorazio, Robert M.; Butterfield, John S.; Meigs-Friend, Gaia; Nico, Leo; Ferrante, Jason A.
Hunter, M.E., Dorazio, R.M., Butterfield, J.S.S., Meigs-Friend, G., Nico, L.G., and Ferrante, J.A., 2016, Detection limits of quantitative and digital PCR assays and their influence in presence-absence surveys of environmental DNA: Molecular Ecology Resources, Accepted Online Early, http://dx.doi.org/10.1111/1755-0998.12619.

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Year Published: 2017

A landscape-scale assessment of above- and belowground primary production in coastal wetlands: Implications for climate change-induced community shifts

Above- and belowground production in coastal wetlands are important contributors to carbon accumulation and ecosystem sustainability. As sea level rises, we can expect shifts to more salt-tolerant communities, which may alter these ecosystem functions and services. Although the direct influence of salinity on species-level primary production has...

Stagg, Camille L.; Schoolmaster, Donald R.; Piazza, Sarai C.; Snedden, Gregg; Steyer, Gregory D.; Fischenich, Craig J; McComas, Robert W.
Stagg, C.L., Schoolmaster, D.R., Jr., Piazza, S.C., Snedden, G., Steyer, G.D., Fischenich, C.J., and McComas, R.W., 2016, A landscape-scale assessment of above- and belowground primary production in coastal wetlands: implications for climate change-induced community shifts: Estuaries and Coasts, First Online, http://dx.doi.org/10.1007/s12237-016-0177-y.

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Year Published: 2017

Mangrove expansion and contraction at a poleward range limit: Climate extremes and land-ocean temperature gradients

Within the context of climate change, there is a pressing need to better understand the ecological implications of changes in the frequency and intensity of climate extremes. Along subtropical coasts, less frequent and warmer freeze events are expected to permit freeze-sensitive mangrove forests to expand poleward and displace freeze-tolerant salt...

Osland, Michael J.; Day, Richard H.; Hall, Courtney T.; Brumfield, Marisa D; Dugas, Jason; Jones, William R.

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Year Published: 2017

Numerical modeling of simultaneous tracer release and piscicide treatment for invasive species control in the Chicago Sanitary and Ship Canal, Chicago, Illinois

In December 2009, during a piscicide treatment targeting the invasive Asian carp in the Chicago Sanitary and Ship Canal, Rhodamine WT dye was released to track and document the transport and dispersion of the piscicide. In this study, two modeling approaches are presented to reproduce the advection and dispersion of the dye tracer (and piscicide...

Zhu, Zhenduo; Motta, Davide; Jackson, P. Ryan; Garcia, Marcelo H.
Zhu, Z., Motta, D., Jackson, P.R., Garcia, M.H. (2016) Numerical modeling of simultaneous tracer release and piscicide treatment for invasive species control in the Chicago Sanitary and Ship Canal, Chicago, Illinois. Environ Fluid Mech (2016). doi:10.1007/s10652-016-9464-1

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Year Published: 2017

Litterfall production of mangroves in the Huizache-Caimanero lagoon system, México

The ecological legacy of the Huizache-Caimanero lagoon system has long been known as a trophically rich and productive ecosystem that supported artisanal fisheries of local and regional importance; however, a decline in fisheries' yields has been observed in recent decades. Mangroves are a fundamental component of this ecosystem, though data...

Flores-Cárdenas, Francisco; Hurtado-Oliva, Miguel Ángel; Doyle, Thomas W.; Nieves-Sotol, Mario; Díaz-Castro, Sara; Manzano-Sarabia, Marlenne
Flores-Cárdenas, F., Hurtado-Oliva, M.A., Doyle, T.W., Nieves-Soto, M., Díaz-Castro, S., and Manzano-Sarabia, M., xxxx, Litterfall production of mangroves in Huizache-Caimanero lagoon system, México, Journal of Coastal Research, Online Ahead of Print, http://dx.doi.org/10.2112/JCOASTRES-D-15-00242.1.

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Year Published: 2017

Hierarchical stochastic modeling of large river ecosystems and fish growth across spatio-temporal scales and climate models: the Missouri River endangered pallid sturgeon example

We present a hierarchical series of spatially decreasing and temporally increasing models to evaluate the uncertainty in the atmosphere – ocean global climate model (AOGCM) and the regional climate model (RCM) relative to the uncertainty in the somatic growth of the endangered pallid sturgeon (Scaphirhynchus albus). For effects on fish...

Wildhaber, Mark L.; Wikle, Christopher K.; Moran, Edward H.; Anderson, Christopher J.; Franz, Kristie J.; Dey, Rima
Wildhaber, M.L., Wikle, C.K., Moran, E.H., Anderson, C.J., Franz, K.J., and Dey, R. 2017, Hierarchical stochastic modeling of large river ecosystems and fish growth across spatio-temporal scales and climate models: Missouri River sturgeon example, In Riddick, A. T., Kessler, H., and Giles, J. R. A. (eds) Integrated Environmental Modelling to Solve Real World Problems: Methods, Vision and Challenges. Geological Society, London, Special Publications, 408

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Year Published: 2017

A fully-stochasticized, age-structured population model for population viability analysis of fish: Lower Missouri River endangered pallid sturgeon example

We develop a fully-stochasticized, age-structured population model suitable for population viability analysis (PVA) of fish and demonstrate its use with the endangered pallid sturgeon (Scaphirhynchus albus) of the Lower Missouri River as an example. The model incorporates three levels of variance: parameter variance (uncertainty about the value of...

Wildhaber, Mark L.; Albers, Janice L.; Green, Nicholas; Moran, Edward H.
Wildhaber, M.L., Albers, J.L., Green, N.S., and Moran, E.H., 2015, A fully-stochasticized, age-structured population model for population viability analysis of fish: Lower Missouri River endangered pallid sturgeon example: Ecological Modelling, Online First Edition, Ausgust 2015

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Year Published: 2017

Hydrologic modeling in a marsh-mangrove ecotone: Predicting wetland surface water and salinity response to restoration in the Ten Thousand Islands region of Florida, USA

At the fringe of Everglades National Park in southwest Florida, United States, the Ten Thousand Islands National Wildlife Refuge (TTINWR) habitat has been heavily affected by the disruption of natural freshwater flow across the Tamiami Trail (U.S. Highway 41). As the Comprehensive Everglades Restoration Plan (CERP) proposes to restore the natural...

Michot, B.D.; Meselhe, E.A.; Krauss, Ken W.; Shrestha, Surendra; From, Andrew S.; Patino, Eduardo
Michot, B., Meselhe, E., Krauss, K., Shrestha, S., From, A., and Patino, E., 2015, Hydrologic modeling in a marsh-mangrove ecotone: predicting wetland surface water and salinity response to restoration in the Ten Thousand Islands region of Florida, USA: Journal of Hydrologic Engineering, D4015002, http://dx.doi.org/10.1061/(ASCE)HE.1943-5584.0001260.

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Year Published: 2017

Methods for estimating selected low-flow frequency statistics and harmonic mean flows for streams in Iowa

A statewide study was conducted to develop regression equations for estimating six selected low-flow frequency statistics and harmonic mean flows for ungaged stream sites in Iowa. The estimation equations developed for the six low-flow frequency statistics include: the annual 1-, 7-, and 30-day mean low flows for a recurrence interval of 10 years...

Eash, David A.; Barnes, Kimberlee K.
Eash, D.A., and Barnes, K.K., 2017, Methods for estimating selected low-flow frequency statistics and harmonic mean flows for streams in Iowa (ver 1.1, November 2017): U.S. Geological Survey Scientific Investigations Report 2012–5171, 99 p., https://doi.org/10.3133/sir20125171.

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Year Published: 2017

A water-budget analysis of Medina and Diversion Lakes and the Medina/Diversion Lake system, with estimated recharge to Edwards aquifer, San Antonio area, Texas

In January 2001, the U.S. Geological Survey—in cooperation with the Edwards Aquifer Authority—began a study to refine and, if possible, extend previously derived (1995–96) relations between the stage in Medina Lake and recharge to the Edwards aquifer to include the effects of reservoir stages below 1,018 feet and greater than 1,046 feet above...

Slattery, Richard N.; Miller, Lisa D.
Slattery, R.N., and Miller, L.D., 2017, A water-budget analysis of Medina and Diversion Lakes and the Medina/Diversion Lake system, with estimated recharge to Edwards aquifer, San Antonio area, Texas (ver. 1.1, February 2017): U.S. Geological Survey Scientific Investigations Report 2004–5209, 41 p., https://doi.org/10.3133/sir20045209.