Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10379
Transboundary pollution: Persistent organochlorine pesticides in migrant birds of the Southwestern United States and Mexico Transboundary pollution: Persistent organochlorine pesticides in migrant birds of the Southwestern United States and Mexico
The hypothesis that migratory birds accumulate persistent organochlorine pesticides (POPs) during the winter in Latin America has been prevalent for many years, particularly since 1,1,1-trichloro-2,2–bis(p-chlorophenyl)ethane (DDT) was banned in the United States in 1972. It has been suggested that peregrine falcons (Falco peregrinus), black-crowned night herons (Nycticorax nycticorax)...
Authors
Miguel A. Mora
Satellite imagery of South Florida December 1989-December 1996 Satellite imagery of South Florida December 1989-December 1996
No abstract available.
Authors
Richard P. Stumpf, Megan L. Frayer
Maps of the shallow shelf off the Florida Keys (subsurface bedrock topography, overlying reefs and sediments, benthic habitats) Maps of the shallow shelf off the Florida Keys (subsurface bedrock topography, overlying reefs and sediments, benthic habitats)
No abstract available.
Authors
Barbara H. Lidz
Population structure and the evolution of sexual size dimorphism and sex ratios in an insular population of Florida box turtles (Terrapene carolina bauri) Population structure and the evolution of sexual size dimorphism and sex ratios in an insular population of Florida box turtles (Terrapene carolina bauri)
Hypotheses in the chelonian literature suggest that in species with sexual size dimorphism, the smaller sex will mature at a smaller size and a younger age than the larger sex, sex ratios should be biased in favor of the earlier maturing sex, and deviations from a 1:1 sex ratio result from maturation of the smaller sex at a younger age. I tested these hypotheses using data collected from...
Authors
C.K. Dodd
Distribution and community structure of ichthyoplankton in Laguna Madre seagrass meadows: Potential impact of seagrass species change Distribution and community structure of ichthyoplankton in Laguna Madre seagrass meadows: Potential impact of seagrass species change
Seasonal ichthyoplankton surveys were made in the lower Laguna Madre, Texas, to compare the relative utilization of various nursery habitats (shoal grass, Halodule wrightii; manatee grass, Syringodium filiforme; and unvegetated sand bottom) for both estuarine and offshore-spawned larvae. The species composition and abundance of fish larvae were determined for each habitat type at six...
Authors
J.M. Tolan, S.A. Holt, C.P. Onuf
Status, trends, and changes in freshwater inflows to bay systems in the Corpus Christi Bay National Estuary Program study area Status, trends, and changes in freshwater inflows to bay systems in the Corpus Christi Bay National Estuary Program study area
This report presents the results of a study to quantify current (1983–93) mean freshwater inflows to the six bay systems (open water and wetlands) in the Corpus Christi Bay National Estuary Program study area, to test for historical temporal trends in inflows, and to quantify historical and projected changes in inflows. The report also addresses the adequacy of existing data to estimate...
Authors
W.H. Asquith, J. G. Mosier, P. W. Bush
The determination of Metals in sediment pore waters and in 1N HCl-extracted sediments by ICP-MS The determination of Metals in sediment pore waters and in 1N HCl-extracted sediments by ICP-MS
Concentrations of metals in sediment interstitial water (pore water) and those extractable from sediment with weak acids can provide important information about the bioavailability and toxicological effects of such contaminants. The highly variable nature of metal concentrations in these matrices requires instrumentation with the detection limit capability of graphite furnace atomic...
Authors
Thomas W. May, Ray H. Wiedmeyer, W. G. Brumbaugh, C. J. Schmitt
The role of mesocosm studies in ecological risk analysis The role of mesocosm studies in ecological risk analysis
Mesocosms have been primarily used as research tools for the evaluation of the fate and effects of xenobiotic chemicals at the population, community, and ecosystem levels of biological organization. This paper provides suggestions for future applications of mesocosm research. Attention should be given to the configuration of mesocosm parameters to explicitly study regional questions of...
Authors
Terence P. Boyle, James F. Fairchild
Analysis of environmental data with censored observations Analysis of environmental data with censored observations
The potential threats to humans and to terrestrial and aquatic ecosystems from environmental contamination could depend on the sum of the concentrations of different chemicals. However, direct summation of environmental data is not generally feasible because it is common for some chemical concentrations to be recorded as being below the analytical reporting limit. This creates special...
Authors
S. Liu, J.-C. Lu, D.W. Kolpin, W.Q. Meeker
Modeling fish dynamics and effects of stress in a hydrologically pulsed ecosystem Modeling fish dynamics and effects of stress in a hydrologically pulsed ecosystem
Many wetlands undergo seasonal cycles in precipitation and water depth.This environmental seasonality is echoed in patterns of production of fishbiomass, which, in turn, influence the phenology of other components of thefood web, including wading birds. Human activities, such as drainage orother alterations of the hydrology, can exacerbate these natural cycles andresult in detrimental...
Authors
Donald L. DeAngelis, William F. Loftus, Joel C. Trexler, Robert E. Ulanowicz
Toxicological and chemical screening of Antarctica sediments: Use of whole sediment toxicity tests, microtox, mutatox and semipermeable membrane devices (SPMDs) Toxicological and chemical screening of Antarctica sediments: Use of whole sediment toxicity tests, microtox, mutatox and semipermeable membrane devices (SPMDs)
Eight whole sediment samples from Antarctica (four from Winter Quarters Bay and four from McMurdo Sound) were toxicologically and chemically evaluated. Also, the influence of ultraviolet radiation on the toxicity and bioavailability of contaminants associated with the sediment samples was assessed. The evaluations were accomplished by use of a 10-day whole sediment test with Leptocheirus
Authors
Laverne Cleveland, Edward E. Little, Jimmie D. Petty, B. Thomas Johnson, Jon A. Lebo, Carl E. Orazio, Jane Dionne