Digital Commons Network^™

Short-Term Hooking Mortality Of Summer Flounder In New York And Virginia, Mark H. Malchoff, Jon A. Lucy

Reports

No abstract provided.

Organic Carbon Partitioning During Spring Phytoplankton Blooms In The Ross Sea Polynya And The Sargasso Sea, C.A. Carlson, Hugh Ducklow, Da Hansell, Walker O. Smith Jr.

VIMS Articles

In this study we evaluate the partitioning of organic carbon between the particulate and dissolved pools during spring phytoplankton blooms in the Ross Sea, Antarctica, and the Sargasso Sea. As part of a multidisciplinary project in the Ross Sea polynya we investigated the dynamics of the dissolved organic carbon (DOC) pool and the role it played in the carbon cycle during the 1994 spring phytoplankton bloom. Phytoplankton biomass during the bloom was dominated by an Antarctic Phaeocystis sp. We determined primary productivity (PP; via H14CO3, incubations), particulate organic carbon (POC), bacterial productivity (BP; via [3H]thymidine incorporation), and DOC during two …

Distribution Of Submerged Aquatic Vegetation In The Chesapeake Bay And Tributaries And The Coastal Bays - 1997, R J. Orth, Judith F. Nowak, David J. Wilcox, Jennifer R. Whiting, Leah S. Nagey

Reports

No abstract provided.

Semiclassical Representation Of Width-Weighted Spectra, M. W. Beims, V. Kondratovich, John B. Delos

Arts & Sciences Articles

We consider a system having decaying states with complex energies Ej−iΓj/2, and we define the “width-weighted spectrum” as DΓ(E)=ΣjΓjδ(E−Ej). We derive a semiclassical formula for this width-weighted spectrum, a formula which is analogous to the periodic-orbit representation of the density of states. The formula applies if classical motion is regular and if decay occurs by tunneling through a barrier. The semiclassical formula involves not periodic orbits or closed orbits, but action integrals associated with irreducible loops on the “extremal torus,” on which the particle climbs up the barrier and hangs at the top. Calculations confirm the validity of the formula.

Application Of A Tidal Prism Water Quality Model To Virginia Small Coastal Basins: Poquoson River, Piankatank River, Cherrystone Inlet And Hungars Creek, Albert Y. Kuo, Arthur J. Butt, Sung-Chan Kim, Jing Lin

Reports

No abstract provided.

Laser In-Situ Scattering And Transmissometer (Lisst) Observations In Support Of The Sensor Insertion System Duck, Nc October, 1997, Grace M. Massey, Carl T. Friedrichs

Reports

The objective of this portion of the study was to collect LIS ST time series at times corresponding to collection of pumped samples of suspended sediment across the width of the surf zone during a major field experiment called SandyDuck '97. The pumped samples were analyzed for total percent sand (>60 micron), total percent mud (0.8 - 60 micron), organic content and sand size distribution. The LISST measures the particle size distribution from 5-500 microns. The purpose was to provide a high quality data set of pumped samples with which to later test the sensitivity of indirect measurements of …

A Comparison Of Size Selectivity And Relative Efficiency Of Sea Scallop Trawls And Dredges, David Rudders, William D. Dupaul, James E. Kirkley

Reports

No abstract provided.

Public Policy: Integrated Approaches To Environmental Policy, Karla S. Havens, Virginia Institute Of Marine Science, Wetlands Program

Reports

No abstract provided.

The Virginia Wetlands Report Vol. 13, No. 3, Virginia Institute Of Marine Science

Virginia Wetlands Reports

• Tundra Swan. Julie G. Bradshaw
• What kind of educational courses and publications does the Wetlands Program offer? William Roberts
• Mummichog. Lyle Varnell
• Using Remote Sensing and GIS To Perform Jurisdictional Wetlands Determinations. Marcia Berman
• United States v. Wilson: Muddy Waters in the Search for Wetlands Protection. S. Fagan and Jim Perry
• Responding to the Chesapeake Executive Council Directive for Wetlands Protection and Restoration Goals. Carl Hershner
• Wetlands: A Critical Resource in the Revolutionary War? Pam Mason

The Jewish Question In Eighteenth-Century France, Ronald Schechter

Arts & Sciences Articles

No abstract provided.

1998-1999, Middle Eastern Music Ensemble’

Ephemera Materials

No abstract provided.

Perkinsus Marinus Tissue Distribution And Seasonal Variation In Oysters Crassostrea Virginica From Florida, Virginia And New York, Lm Oliver, Ws Fisher, Se Ford, Lm Ragone Calvo, Em Burreson, Et Al

VIMS Articles

Perkinsus marinus infection intensity was measured in eastern oysters Crassostrea virginica collected in October and December 1993, and March, May, and July 1994 from 3 U.S. sites: Apalachicola Bay (FL), Chesapeake Bay (VA), and Oyster Bay (Mr'). Gill, mantle, digestive gland. adductor muscle, hemolymph, and remaining tissue (including gonadal material and rectum) were dissected from 20 oysters from each site at each collection time. Samples were separately diagnosed for P. marin us infections by incubation in Ray's Fluid Thioglycollate Medium (RFTM) and subsequent microscopic quantification of purified enlarged hypnospores. At all sampling times and sites, average P. marinus infection intensity …

Molecular Insights Into The Population Structures Of Cosmopolitan Marine Fishes, John Graves

VIMS Articles

Many marine fishes are cosmopolitan, occurring in continuous (e.g., circumtropical) or discontinuous (e.g., antitropical) distributions. Little is known of the genetic basis of population structure of these species, even though several support extensive fisheries. To develop a database that would facilitate comparison of the population structures among cosmopolitan fishes we consistently included restriction fragment length polymorphism (RFLP) analysis of mitochondrial DNA (mtDNA) as a common approach to our investigations of these species. This article presents a review of those analyses. Considerable intra`specific genetic variation was revealed within all cosmopolitan marine species. Continuously distributed species displayed population structures ranging from a …

Histopathological Alterations Associated With Perkinsus Spp. Infection In The Softshell Clam Mya Arenaria, Sm Mclaughlin, M Faisal

VIMS Articles

Softshell clams (Mya arenaria) collected from the Chester River in the upper Chesapeake Bay showed the presence of Perkinsus spp, in similar to 12 % (28/240) Of clams examined. The infection seems to run a mild course with the host prevailing in encapsulating invading parasites. The gills appear to be the major site of infection, however, the parasite was also found in the digestive gland, gonads, and kidneys and occasionally in the tissue and sinuses of adductor muscles. Typically, clusters of protozoal cells were embedded in on amorphous PAS-positive substrate and were surrounded by one or more layers of granulocytes. …

On The Frequency Of Eusociality In Snapping Shrimps (Decapoda : Alpheidae), With Description Of A Second Eusocial Species, Je Duffy

VIMS Articles

Recently, the Caribbean snapping shrimp Synalpheus regalis was shown to be eusocial by the criteria historically used for honeybees, ants, and termites, i.e., colonies contain a single reproducing female and a large number of non-breeding "workers." This finding prompted a reexamination of several previously puzzling reports of unusual population structures in other Synalpheus species. New collections, and observations made by students of this genus over the last century, suggest that several sponge-dwelling Synalpheus species similarly exhibit overlapping generations and monopolization of reproduction by a few individuals, and thus that these species may also be eusocial according to classical entomological criteria. …

Extracting Classical Trajectories From Atomic Spectra, M. R. Haggerty, Neal Spellmeyer, Daniel Kleppner, John B. Delos

Arts & Sciences Articles

We describe how to reconstruct individual classical trajectories from spectroscopic data. The ac dipole moment of a trajectory can be found from the effect of an oscillating field on the spectrum. The inverse Fourier transform of such data yields the component of the electron trajectory along the direction of the oscillating field. We demonstrate the method by experimentally extracting z(t) for two electron trajectories that influence the Stark spectrum of Rydberg lithium. Within the experimental resolution, the reconstructed orbits agree well with classical predictions.

The Virginia Wetlands Report Vol. 13, No. 2, Virginia Institute Of Marine Science

Virginia Wetlands Reports

• Wood Duck. Julie G. Bradshaw
• Striped Killifish. Lyle Varnell
• An Update on the Virginia Geographic Information Network. Marcia R. Berman
• Wild Rice. Pam Mason
• What is riprap? Is it preferred over a bulkhead for shoreline erosion control? William Roberts
• An Introduction to Stressed Habitats. James E. Perry, John E. Anderson, and Arnold F. Theisen

Eastern Shore Laboratory, Virginia Institute Of Marine Science, College Of William And Mary, Mark Luckenbach

VIMS Articles

The Virginia Institute of Marine Science (VIMS) Eastern Shore Laboratory (ESL) is located in the coastal village of Wachapreague, Virginia, on the landward margin of a mid-Atlantic barrier island-salt marsh-la goon system. The facility serves as both a field station in support of re search and teaching activities and as a site for resident research in coastal ecology and aquaculture. By virtue of its access to the unique coastal habi tats, excellent water quality, and an extensive seawater laboratory, the fa cility affords educational and re search opportunities not available elsewhere within the region.

Prevalence And Distribution Of Qpx, Quahog Parasite Unknown, In Hard Clams Mercenaria Mercenaria In Virginia, Usa, Lm Ragone Calvo, Jg Walker, Em Burreson

VIMS Articles

In July 1996, the Virginia Institute of Marine Science initiated a sampling program to examine wild and cultured hard clams Mercenaria mercenaria for QPX, Quahog Parasite Unknown, a protistan parasite associated with severe mortalities of hard clams in localized areas in maritime Canada and Massachusetts, USA. The sampling program set out to seasonally monitor wild clams from one site, James River, Virginia, and cultured clams from 2 sites, Chincoteague Bay and Mattawoman Creek, Virginia. Histological examination of initial samples revealed 8% prevalence of the parasite in 1-2 yr old cultured clams in Chincoteague Bay. This is the first documentation of …

Ontogenetic Diet Shifts In Nassau Grouper: Trophic Linkages And Predatory Impact, Db Eggleson, Jj Grover, Rom Lipcius

VIMS Articles

Understanding which fauna and flora from seagrass beds serve as primary food for reef-based commuters is critical in defining trophic linkages between shallow-water habitats of tropical oceanic regions. Although numerous studies have documented the relative importance of crustaceans in the diet of reef fishes associated with tropical seagrass meadows, it is unknown if trophic importance corresponds to a significant effect on prey distribution and abundance patterns. We quantified size-specific diet of juvenile Nassau grouper (Epinephelus striatus) inhabiting natural and artificial patch reefs, and manipulated the density of artificial patch reefs (0, 8, and 16 patch reefs per ha) to examine …

Postimpact Deformation Associated With The Late Eocene Chesapeake Bay Impact Structure In Southeastern Virginia, Gerald H. Johnson, Sarah E. Kruse, Allison W. Vaughn, John K. Lucey, C. Hobbs, David S. Powars

VIMS Articles

Upper Cenozoic strata covering the Chesapeake Bay impact structure in southeastern Virginia record intermittent differential movement around its buried rim. Miocene strata in a graben detected by seismic surveys on the York River exhibit variable thickness and are deformed above the crater rim. Fan-like interformational and intraformational angular unconformities within Pliocene–Pleistocene strata, which strike parallel to the crater rim and dip2°–3° away from the crater center, indicate that deformation and deposition were synchronous.Concentric, large-scale crossbedded, bioclastic sand bodies of Pliocene age within ~20 km of the buried crater rim formed on offshore shoals, presumably as subsiding listric slump blocks rotated …

A Study On Online Interface For Research Information Systems: Information Organization For Adaptive Interface, Mihyeon Kim

School of Education Articles

This study is to contribute to develop adaptive information systems meeting inside information needs as well as represented information needs, and dealing with every levels of users and user's preferences. Also, this study is to present a method of developing adaptive information system through developing user profile using machine teaming and decision tree, applying relevance feedback using merged vector, and applying user feedback.

Scaled-Energy Floquet Spectroscopy In A Strong Electric Field: A Semiquantal Calculation Of The Recurrence Spectrum, V. Kondratovich, John B. Delos

Arts & Sciences Articles

We consider a hydrogen atom in a strong static electric field with a weak parallel radio-frequency (rf) field. We compute the photoabsorption spectrum by calculating the spectrum of Floquet states, including their quasienergies and their oscillator strengths. Our calculation is based upon “semiquantal” formulas: we calculate the discrete spectrum of quasienergy states by using a quantum adiabatic approximation combined with semiclassical (Bohr-Sommerfeld) quantization rules. We express this spectrum in a manner consistent with the method of scaled-variable spectroscopy, and then calculate the Fourier transform. These calculated absorption spectra and recurrence spectra are in good agreement with experiments on Li atoms. …

Semiclassical Formula For Oscillator Strengths Of Atomic Spectra In External Fields, V. Kondratovich, John B. Delos

Arts & Sciences Articles

In a previous Rapid Communication [Phys. Rev. A 56, R5 (1997)] we reported a semiclassical formula describing oscillator strengths for transitions to a high Rydberg state of a hydrogen atom in an electric field. The formula relates the oscillator strength for an atomic transition into a Rydberg state to the angular distribution of outgoing electron waves and to the density of classical tori. Here we give a derivation of that formula and we suggest some generalizations. We compare the formula with experimental measurements of the absorption spectrum of hydrogen in an electric field. This absorption spectrum consists of quasidiscrete resonances …

Continuing Trophic Studies On Constructed “Restored” Oyster Reefs, Roger Mann, Juliana M. Harding

Reports

No abstract provided.

Research On Usability Of An Opac (Online Public Access Catalog), Mihyeon Kim

School of Education Articles

This study is to determine whether color, icon, sorting methods of brief description about materials, and positioning methods of final records affect the usability of the OPAC (Online Public Access Catalog) screen designs in terms of success rate, search time, and users' preferences. The findings suggest that OPAC systems can be optimized to enhance user's performances conflict with each other, designers should give more weight to performance because of the library's mission of meeting users' information needs.

Effects Of Wind Speed And Particulate Matter Source On Surface Microlayer Characteristics And Enrichment Of Organic Matter In Southern Chesapeake Bay, Kewen Liu, Rebecca M. Dickhut

VIMS Articles

Surface microlayer (SM) samples were collected with a rotating cylinder sampler from the York and Elizabeth River estuaries of lower Chesapeake Bay bimonthly from May 1994 through June 1995. Two intensive samplings were also conducted in the York River during different seasons: one in December 1994 and another during June 1995. Four SM samples were collected during each intensive sampling within 4 days. All the samples were analyzed for total suspended particulates (TSP), particulate nitrogen (PN), particulate organic carbon (POC) and dissolved organic carbon(DOC). The thickness of the SM was observed to decrease linearly with increased wind speed. TSP and …

Meadow Beauty Rhexia Mariana L., Gene Silberhorn

Reports

The Wetland Flora Technical Report series provides concise information regarding the identification, growth habits, distribution, habitat, ecology and wetland indicator status for the title species. Illustrations are also included to aid in specimen ident

Juvenile Finfish And Blue Crab Stock Assessment Program Bottom Trawl Survey Annual Data Summary Report Series Volume 1997, Patrick J. Geer

Reports

The Virginia Institute of Marine Science (VIMS) has conducted a trawl survey dating back to 1955. Over the years methods and objectives have varied according to funding sources and state and/or federal mandates. The present thrust of the program is to provide juvenile indices of relative abundance for recreationally, commercially, and ecologically important fish and invertebrates. These measures of juvenile abundance are widely used as a key element in the management of the Atlantic States' coastal fishery resources. Estimates of juveniles ( age-0) have proven to be a reliable and early indicator of future year-class strength. A review of previously …

The Virginia Wetlands Report Vol. 13, No. 1, Virginia Institute Of Marine Science

Virginia Wetlands Reports

• Northern Pintail. Julie G. Bradshaw
• Sheepshead Minnow. Lyle Varnell
• Classifying Satellite Imagery to Detect Land Cover Features. Marcia Berman
• Monitoring Wetlands Status and Trends: The Remote Sensing Solution. Carl Hershner
• Roof Thatching: Phragmites as a Building Material. Pam Mason
• Are nonvegetated, muddy shorelines valuable to the health of the Chesapeake Bay? William Roberts