Publications
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Airborne laser mapping of Assateague National Seashore Beach
Results are presented from topographic surveys of the Assateague Island National Seashore using an airborne scanning laser altimeter and kinematic Global Positioning System (GPS) technology. The instrument used was the Airborne Topographic Mapper (ATM), developed by the NASA Arctic Ice Mapping (AIM) group from the Goddard Space Flight Center's Wallops Flight Facility. In November, 1995, and agai
Authors
W.B. Krabill, C. W. Wright, R.N. Swift, E.B. Frederick, S.S. Manizade, J.K. Yungel, C.F. Martin, J.G. Sonntag, Mark Duffy, William Hulslander, John Brock
Protection of fish spawning habitat for the conservation of warm-temperature reef-fish fisheries of shelf-edge reefs of Florida
We mapped and briefly describe the surficial geology of selected examples of shelf-edge reefs (50–120 m deep) of the southeastern United States, which are apparently derived from ancient Pleistocene shorelines and are intermittently distributed throughout the region. These reefs are ecologically significant because they support a diverse array of fish and invertebrate species, and they are the onl
Authors
Christopher C. Koenig, Felicia C. Coleman, Churchill B. Grimes, Gary R. Fitzhugh, Kathryn M. Scanlon, Christopher T. Gledhill, Mark Grace
Sea-floor environments within Long Island Sound: A regional overview
Modern sea-floor sedimentary environments within the glaciated, topographically complex Long Island Sound estuary have been interpreted and mapped from an extensive collection of sidescan sonographs, bottom samples, and video-camera observations together with supplemental bathymetric, marine-geologic, and bottom-current data. Four categories of environments are present that reflect the dominant lo
Authors
Harley J. Knebel, Lawrence J. Poppe
Regional processes, conditions, and characteristics of the Long Island Sound sea floor
No abstract available.
Authors
Harley J. Knebel, Ralph S. Lewis, Varekamp
Contrasting patterns of habitat use by prawns and crayfish in a headwater marsh of the St. Johns River, Florida
We compared seasonal patterns of habitat use by the prawn Palaemonetes paludosus and the crayfish Procambarus alleni in Blue Cypress Marsh Conservation Area, Florida. Prawn densities were similar to those found in other oligotrophic wetlands of southern Florida, whereas crayfish densities were much greater than reported previously for other wetlands in the area. Prawns and crayfish had strikingly
Authors
Frank Jordan, Kimberly J. Babbitt, Carole C. McIvor, Steven J. Miller
Evaluation of remote-sensing techniques to measure decadal-scale changes of Hofsjokull ice cap, Iceland
Dynamic surficial changes and changes in the position of the firn line and the areal extent of Hofsjökull ice cap, Iceland, were studied through analysis of a time series (1973–98) of synthetic-aperture radar (SAR) and Landsat data. A digital elevation model of Hofsjökull, which was constructed using SAR interferometry, was used to plot the SAR backscatter coefficient (σ°) vs elevation and air t
Authors
D.K. Hall, R.S. Williams, J.S. Barton, O. Sigurdsson, L.C. Smith, J.B. Garvin
Last interglacial reef growth beneath Belize barrier and isolated platform reefs
We report the first radiometric dates (thermal-ionization mass spectrometry) from late Pleistocene reef deposits from offshore Belize, the location of the largest modern reef complex in the Atlantic Ocean. The results presented here can be used to explain significant differences in bathymetry, sedimentary facies, and reef development of this major reef area, and the results are significant because
Authors
Eberhard Gischler, Anthony J. Lomando, J. Harold Hudson, Charles W. Holmes
Portable coastal observatories
Ocean observational science is in the midst of a paradigm shift from an expeditionary science centered on short research cruises and deployments of internally recording instruments to a sustained observational science where the ocean is monitored on a regular basis, much the way the atmosphere is monitored. While satellite remote sensing is one key way of meeting the challenge of real-time monitor
Authors
Daniel Frye, Bradford Butman, Mark Johnson, Keith von der Heydt, Steven Lerner
Holocene and recent sediment accumulation rates in southern Lake Michigan
Rates of sediment accumulation in Lake Michigan are a key component of its geologic history and provide important data related to societal concerns such as shoreline erosion and the fate of anthropogenic pollutants. Previous attempts to reconstruct Holocene rates of sediment accumulation in Lake Michigan, as well as in the other Laurentian Great Lakes, have been bedeviled by the effect of refracto
Authors
Steven M. Colman, J.W. King, Glenn A. Jones, R. L. Reynolds, Michael H. Bothner
Local variability but landscape stability in coral reef communities following repeated hurricane impacts
Coral reef community structure has remained remarkably stable over a 10 yr period within a small protected marine area despite repeated hurricane impacts. Local community dynamics have been highly variable, however. Sites that were destroyed by disease in the 1970s are showing little or no recovery, while sites less than a kilometre away that were devastated by Hurricane Hugo in 1989 are recoverin
Authors
John C. Bythell, Zandy M Hillis-Star, Caroline S. Rogers
Modern pollen deposition in Long Island Sound
Palynological analyses of 20 surface sediment samples collected from Long Island Sound show a pollen assemblage dominated by Carya, Betula, Pinus, Quercus, Tsuga, and Ambrosia, as is consistent with the regional vegetation. No trends in relative abundance of these pollen types occur either from west to east or associated with modern riverine inputs throughout the basin. Despite the large-scale, lo
Authors
Kristina R.M. Beuning, Lindsey Fransen, Berna Nakityo, Ellen L. Mecray, Marilyn R. Buchholtz ten Brink