Publications
Publications from USGS science centers throughout the Southeast Region.
Filter Total Items: 10392
The cave associated amphibians of Great Smoky Mountains National Park: review and monitoring The cave associated amphibians of Great Smoky Mountains National Park: review and monitoring
No abstract available.
Authors
C. Kenneth Dodd, Marian L. Griffey
Genetic variation in insecticide tolerance in a population of southern leopard frogs (Rana sphenocephala): Implications for amphibian conservation Genetic variation in insecticide tolerance in a population of southern leopard frogs (Rana sphenocephala): Implications for amphibian conservation
Currently, conservation efforts are devoted to determining the extent and the causes of the decline of many amphibian species worldwide. Human impacts frequently degrade amphibian habitat and have been implicated in many declines. Because genetic variance is critical in determining the persistence of a species in a changing environment, we examined the amount of genetic variability...
Authors
C.M. Bridges, R. D. Semlitsch
Morphometrics, sexual dimorphism, and growth in the Angonoka tortoise (Geochelone yniphora) of western Madagascar Morphometrics, sexual dimorphism, and growth in the Angonoka tortoise (Geochelone yniphora) of western Madagascar
The most recent description of the morphology of the rare endemic Madagascar tortoise,Geochelone yniphora was based on fewer than 20 specimens. We collected morphological data for 200 free‐ranging tortoises from five populations over a four‐year period. Tortoises ranged in size from 43.5 mm carapace length at hatching to a maximum of 481 mm in an adult male. We were able to develop a...
Authors
Lora L. Smith, Miguel Pedrono, Robert M. Dorazio, Jack Bishko
2,3,7,8-Tetrachlorodibenzo-p-dioxin induces apoptotic cell death and cytochrome P4501A expression in developing Fundulus heteroclitus embryos 2,3,7,8-Tetrachlorodibenzo-p-dioxin induces apoptotic cell death and cytochrome P4501A expression in developing Fundulus heteroclitus embryos
Fundulus heteroclitus embryos were exposed to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) during early development using nanoinjection or water bath exposure. TCDD caused developmental abnormalities that included hemorrhaging, loss of vascular integrity, edema, stunted development and death. The LC50 and LD50 of TCDD for Fundulus embryos were ???19.7??9.5 pg TCDD/??l (water bath) and 0.25...
Authors
B.H. Toomey, S. Bello, M.E. Hahn, S. Cantrell, P. Wright, D. E. Tillitt, R.T. Di Giulio
Resistance of a lizard (the green anole, Anolis carolinensis; Polychridae) to ultraviolet radiation-induced immunosuppression Resistance of a lizard (the green anole, Anolis carolinensis; Polychridae) to ultraviolet radiation-induced immunosuppression
The green anole (Anolis carolinensis) is the most northerly distributed of its Neotropical genus. This lizard avoids a winter hibernation phase by the use of sun basking behaviors. Inevitably, this species is exposed to high doses of ambient solar ultraviolet radiation (UVR). Increases in terrestrial ultraviolet-B (UV-B) radiation secondary to stratospheric ozone depletion and habitat...
Authors
R.B. Cope, D. L. Fabacher, C. Lieske, C.A. Miller
Gill lesions and death of bluegill in an acid mine drainage mixing zone Gill lesions and death of bluegill in an acid mine drainage mixing zone
The toxicity of an acid mine drainage (AMD) mixing zone was investigated by placing bluegill (Lepomis macrochirus) at the confluence of a stream contaminated by AMD and a stream having neutral pH. A mixing channel receiving water from both streams was assembled in the field, during July and October 1996, to determine the toxicity of freshly mixed and aged water (2.9–7.5 min). The AMD...
Authors
T.B. Henry, E.R. Irwin, J.M. Grizzle, W. G. Brumbaugh, M. L. Wildhaber
Tagging and tracking Tagging and tracking
No abstract available.
Authors
Mark N. Landers, A. Westgate, Robert K. Bonde, M.J. Murray
Manatee and seagrass habitat characterization in Puerto Rico Manatee and seagrass habitat characterization in Puerto Rico
No abstract available.
Authors
James P. Reid, Dean E. Easton, W. Judson Kenworthy
Relations among geology, physiography, land use, and stream habitat conditions in the Buffalo and Current River systems, Missouri and Arkansas Relations among geology, physiography, land use, and stream habitat conditions in the Buffalo and Current River systems, Missouri and Arkansas
This study investigated links between drainage-basin characteristics and stream habitat conditions in the Buffalo National River, Arkansas and the Ozark National Scenic Riverways, Missouri. It was designed as an associative study - the two parks were divided into their principle tributary drainage basins and then basin-scale and stream-habitat data sets were gathered and compared between...
Authors
Maria S. Panfil, Robert B. Jacobson
U.S. Geological Survey Program on the South Florida Ecosystem, 2000 proceedings: Presentations made at the Greater Everglades Ecosystem Restoration (GEER) Conference, December 11-15, 2000, Naples, Florida U.S. Geological Survey Program on the South Florida Ecosystem, 2000 proceedings: Presentations made at the Greater Everglades Ecosystem Restoration (GEER) Conference, December 11-15, 2000, Naples, Florida
No abstract available.
Authors
Jane R. Eggleston, Teresa L. Embry, Robert H. Mooney, Leslie Wedderburn, Carl R. Goodwin, Heather S. Henkel, Kathleen M.H. Pegram, Tracy J. Enright
Water-quality assessment of the eastern Iowa basins– Nitrogen, phosphorus, suspended sediment, and organic carbon in surface water, 1996–98 Water-quality assessment of the eastern Iowa basins– Nitrogen, phosphorus, suspended sediment, and organic carbon in surface water, 1996–98
Twelve sites on streams and rivers in the Eastern Iowa Basins study unit were sampled monthly and during selected storm events from March 1996 through September 1998 to assess the occurrence, distribution, and transport of nitrogen, phosphorus, suspended sediment, and organic carbon as part of the U.S. Geological Survey’s National Water-Quality Assessment Program. One site was dropped...
Authors
Kent Becher, Stephen J. Kalkhoff, Douglas J. Schnoebelen, Kimberlee K. Barnes, Von E. Miller
Cytochrome P450 1A expression in midwater fishes: Potential effects of chemical contaminants in remote oceanic zones Cytochrome P450 1A expression in midwater fishes: Potential effects of chemical contaminants in remote oceanic zones
Cytochrome P450 1A (CYP1A) induction is a robust marker for exposure to polynuclear aromatic hydrocarbons and planar halogenated aromatic hydrocarbons that are aryl hydrocarbon receptor agonists. We examined CYP1A expression in mesopelagic fishes from the western North Atlantic. Individuals in 22 species were obtained from slope water and the Sargasso Sea in 1977, 1978, and 1993. Aryl...
Authors
John J. Stegeman, Jennifer J. Schlezinger, James E. Craddock, Donald E. Tillitt