Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10361
Nitrogen limitation of growth and nutrient dynamics in a disturbed mangrove forest, Indian River Lagoon, Florida Nitrogen limitation of growth and nutrient dynamics in a disturbed mangrove forest, Indian River Lagoon, Florida
The objectives of this study were to determine effects of nutrient enrichment on plant growth, nutrient dynamics, and photosynthesis in a disturbed mangrove forest in an abandoned mosquito impoundment in Florida. Impounding altered the hydrology and soil chemistry of the site. In 1997, we established a factorial experiment along a tree-height gradient with three zones, i.e., fringe...
Authors
Ilka C. Feller, D.F. Whigham, K.L. McKee, C. E. Lovelock
Bisphenol A is released from used polycarbonate animal cages into water at room temperature Bisphenol A is released from used polycarbonate animal cages into water at room temperature
Bisphenol A (BPA) is a monomer with estrogenic activity that is used in the production of food packaging, dental sealants, polycarbonate plastic, and many other products. The monomer has previously been reported to hydrolyze and leach from these products under high heat and alkaline conditions, and the amount of leaching increases as a function of use. We examined whether new and used
Authors
Kembra L. Howdeshell, Paul H. Peterman, Barbara M. Judy, Julia A. Taylor, Carl E. Orazio, Rachel L. Ruhlen, Frederick S. vom Saal, Wade V. Welshons
Approaches to developing sediment quality guidelines for PAHs: Chapter 17 Approaches to developing sediment quality guidelines for PAHs: Chapter 17
No abstract available.
Authors
David R. Mount, Christopher G. Ingersoll, Joy A. McGrath
Using strip-transect aerial surveys to estimate manatee abundance and population trend in the Ten Thousand Islands Region of southwest Florida Using strip-transect aerial surveys to estimate manatee abundance and population trend in the Ten Thousand Islands Region of southwest Florida
No abstract available.
Authors
Dean E. Easton, Lynn W. Lefebvre, T.J. Doyle
In praise of mechanistically-rich models In praise of mechanistically-rich models
Quantitative models are crucial to almost every area of ecosystem science. They provide a logical structure that guides and informs empirical observations of ecosystem processes. They play a particularly crucial role in synthesizing and integrating our understanding of the immense diversity of ecosystem structure and function. Increasingly, models are being called on to predict the...
Authors
Donald L. DeAngelis, Wolf M. Mooij
In ovo exposure to o,p -DDE affects sexual development but not sexual differentiation in Japanese medaka (Oryzias latipes). In ovo exposure to o,p -DDE affects sexual development but not sexual differentiation in Japanese medaka (Oryzias latipes).
Despite being banned in many countries, dichlorodiphenyltrichloroethane (DDT) and its metabolites dichlorodiphenyldichloroethylene (DDE) and dichlorodiphenyldichloroethane (DDD) continue to be found in fish tissues at concentrations of concern. Like o,p -DDT, o,p -DDE is estrogenic and is believed to exert its effects through binding to the estrogen receptor. The limited toxicologic data...
Authors
D. M. Papoulias, Sergio A. Villalobos, J. Meadows, Douglas B. Noltie, J. P. Giesy, D. E. Tillitt
Direct assessment of groundwater vulnerability from single observations of multiple contaminants Direct assessment of groundwater vulnerability from single observations of multiple contaminants
Groundwater vulnerability is a central concept in pollution risk assessment, yet its estimation has been largely a matter of expert judgment. This work applies a method for the direct calculation of vulnerability from monitoring well observations of pesticide concentrations. The method has two major advantages: it is independent of the compounds being examined, and it has a direct...
Authors
Fred Worrall, Dana W. Kolpin
Interactions of an insecticide, herbicide, and natural stressors in amphibian community mesocosms Interactions of an insecticide, herbicide, and natural stressors in amphibian community mesocosms
Amphibians developing in wetlands embedded within or near agricultural lands may frequently encounter chemical mixtures. The objectives of our study were to determine the effects that post-application concentrations of an insecticide (carbaryl) and an herbicide (atrazine) have on body mass, development, and survival of two anuran species (southern leopard frog, Rana sphenocephala...
Authors
M.D. Boone, S.M. James
Using ground-placed PVC pipes to monitor hylid treefrogs: Capture biases Using ground-placed PVC pipes to monitor hylid treefrogs: Capture biases
We sampled a population of two species of hylid treefrogs using 90 vertical ground-placed PVC pipes of 3 diameters positioned along a 1500-m transect at a forest-open pond ecotone in north-central Florida in order to identify potential capture biases. We recorded 1,981 treefrog observations (778 unmarked, 1,203 recaptures) in 8 months. Our results identified species-specific seasonal and...
Authors
M. Zacharow, W.J. Barichivich, C.K. Dodd
Leaf litterbags: factors affecting capture of stream-dwelling salamanders Leaf litterbags: factors affecting capture of stream-dwelling salamanders
No abstract available.
Authors
J. L. Waldron, C. Kenneth Dodd, Jeffrey D. Corser
Wildlife mortality on Highway U.S. 441 across Paynes Prairie, Alachua County, Florida Wildlife mortality on Highway U.S. 441 across Paynes Prairie, Alachua County, Florida
Abstract not supplied at this time
Authors
L. L. Smith, C.K. Dodd
Mass tree mortality leads to mangrove peat collapse at Bay Islands, Honduras after Hurricane Mitch Mass tree mortality leads to mangrove peat collapse at Bay Islands, Honduras after Hurricane Mitch
We measured sediment elevation and accretion dynamics in mangrove forests on the islands of Guanaja and Roatan, Honduras, impacted by Hurricane Mitch in 1998 to determine if collapse of underlying peat was occurring as a result of mass tree mortality. Little is known about the balance between production and decomposition of soil organic matter in the maintenance of sediment elevation of...
Authors
Donald R. Cahoon, P. Hensel, J. Rybczyk, K.L. McKee, C.E. Proffitt, B.C. Perez