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The Effects Of Contaminated Sediment On The Epidermal Goblet Cells Of The Mummichog, Fundulus Heteroclitus, Laurent C. Mézin Jan 1994

The Effects Of Contaminated Sediment On The Epidermal Goblet Cells Of The Mummichog, Fundulus Heteroclitus, Laurent C. Mézin

Dissertations, Theses, and Masters Projects

Secretion of mucus by epidermal goblet cells is an important first line of defense for teleosts. It protects them against many of the biological, physical and chemical insults they encounter in their environment. This project monitored changes in hemoglobin concentration in epidermal mucus and in the density, diameter and mucus quality of epidermal goblet cells in the mummichog, Fundulus heteroclitus, following exposure to creosote-contaminated sediment. Male fish (200) were exposed for 13 days in flowthough aquaria to either an uncontaminated reference sediment or contaminated sediment containing 30% Elizabeth River sediment. Fish were sampled on Days 0, 3, 7 and 13 ...


Size-Specific Fecundity Of The Sea Scallop, Placopecten Magellanicus, During One Spawning Period In The Mid-Atlantic Resource Area, Ryan B. Carnegie Jan 1994

Size-Specific Fecundity Of The Sea Scallop, Placopecten Magellanicus, During One Spawning Period In The Mid-Atlantic Resource Area, Ryan B. Carnegie

Dissertations, Theses, and Masters Projects

No abstract provided.


Use Of A Landscape-Level Approach To Determine The Habitat Requirements Of The Yellow-Crowned Night-Heron, Nycticorax Violaceus, In The Lower Chesapeake Bay, Ellen L. Bentley Jan 1994

Use Of A Landscape-Level Approach To Determine The Habitat Requirements Of The Yellow-Crowned Night-Heron, Nycticorax Violaceus, In The Lower Chesapeake Bay, Ellen L. Bentley

Dissertations, Theses, and Masters Projects

No abstract provided.


Auditory Evoked Potentials Of The Loggerhead Sea Turtle (Caretta Caretta), Soraya M. Bartol Jan 1994

Auditory Evoked Potentials Of The Loggerhead Sea Turtle (Caretta Caretta), Soraya M. Bartol

Dissertations, Theses, and Masters Projects

No abstract provided.


Measurement Of In Situ Eelgrass Community Metabolism In Standing And Flowing Waters: Methods And Models, William James Seufzer Jan 1994

Measurement Of In Situ Eelgrass Community Metabolism In Standing And Flowing Waters: Methods And Models, William James Seufzer

Dissertations, Theses, and Masters Projects

No abstract provided.


A Gis Spatial Analysis Of The Potential Conflict Between Submerged Aquatic Vegetation Management And The Development Of Shellfish Aquaculture In The Lower Chesapeake Bay, Laura Ann Grignano Jan 1994

A Gis Spatial Analysis Of The Potential Conflict Between Submerged Aquatic Vegetation Management And The Development Of Shellfish Aquaculture In The Lower Chesapeake Bay, Laura Ann Grignano

Dissertations, Theses, and Masters Projects

No abstract provided.


Life History And Fisheries Ecology Of Weakfish, Cynoscion Regalis, In The Chesapeake Bay Region, Susan Lowerre Jan 1994

Life History And Fisheries Ecology Of Weakfish, Cynoscion Regalis, In The Chesapeake Bay Region, Susan Lowerre

Dissertations, Theses, and Masters Projects

Otoliths, scales, dorsal spines, and pectoral fin rays were compared to determine the best hardpart for ageing weakfish, Cynoscion regalis. Sectioned otoliths showed the clearest marks and were validated by the marginal increment method for ages 1-5. Traditionally-used scales were found to be less-precise and to underage older fish. Most weakfish from the Chesapeake Bay region were 200-600 mm TL and ages 1-4. Weakfish were not fully-recruited to commercial foodfish grades until age 2. Maximum observed age was 17 from a Delaware Bay fish collected in 1985. Current maximum observed ages were age 12 in Chesapeake Bay and age 11 ...


Predation On Juvenile Blue Crabs, Callinectes Sapidus Rathbun, In Lower Chesapeake Bay: Patterns, Predators, And Potential Impacts, Kirt E. Moody Jan 1994

Predation On Juvenile Blue Crabs, Callinectes Sapidus Rathbun, In Lower Chesapeake Bay: Patterns, Predators, And Potential Impacts, Kirt E. Moody

Dissertations, Theses, and Masters Projects

Various investigations of the population dynamics of blue crabs in Chesapeake Bay indicate that predator-induced mortality in the juvenile phase may determine year-class strength. In a tethering study, which spanned three seasons in shallow-water habitats of the lower York River, daily mortality rates of juvenile crabs were measured across three variables: crab size (30-70 mm carapace width), habitat type (seagrass, mud, and sand), and month (May-November). Vulnerability to predation was consistently lower for larger crabs, approaching a size refuge from predation at approximately 90 mm carapace width. Predation was most intense in unvegetated sand habitats, and significantly lower in seagrass ...


Global Phylogeography Of Yellowfin Tuna, Thunnus Albacares, And Mackerels Of The Genus Scomber, Daniel R. Scoles Jan 1994

Global Phylogeography Of Yellowfin Tuna, Thunnus Albacares, And Mackerels Of The Genus Scomber, Daniel R. Scoles

Dissertations, Theses, and Masters Projects

Intraspecific genetic relationships within yellowfin tuna, Thunnus albacares, and three mackerels of the genus Scomber were studied by restriction fragment length polymorphism (RFLP) analysis of mitochondrial DNA (mtDNA). The comparison of these scombrids, with different larval distributions, adult distributions, and vagilities, served to investigate the hypothesis that population structure in marine fishes results from geographic and physical oceanographic processes that limit dispersal of early life history stages. Samples of 20 yellowfin tuna were examined from each of five Pacific locations and one Atlantic location. MtDNA analysis with 12 informative restriction endonucleases demonstrated considerable genetic variation, as evidenced by overall nucleon ...


Quantification Of Settlement And Recruitment Processes In Bivalve Mollusks, Patrick Kelly Baker Jan 1994

Quantification Of Settlement And Recruitment Processes In Bivalve Mollusks, Patrick Kelly Baker

Dissertations, Theses, and Masters Projects

Studies were carried out to quantify abundance, mortality, and variability in these parameters, during settlement and recruitment of bivalve mollusks, using the oyster, Crassostrea virginica, as a primary model species. Most work was undertaken in the York River, Chesapeake Bay, Virginia, with additional work in the Indian River, Florida. The period chosen, in the bivalve early life history, was from the late planktonic larva to the early benthic juvenile. Studies were designed to specifically examine (a) abundance of late-stage larvae in the plankton, (b) the relationship between larval abundance and settlement, and (c) mortality immediately following settlement. Variability in abundance ...


In Vitro And In Vivo Effects Of Chemotherapeutants On The Oyster Parasite, Perkinsus Marinus, Gustavo W. Calvo Jan 1994

In Vitro And In Vivo Effects Of Chemotherapeutants On The Oyster Parasite, Perkinsus Marinus, Gustavo W. Calvo

Dissertations, Theses, and Masters Projects

To investigate the potential of chemotherapeutants to control the oyster pathogen Perkinsus marinus, anticoccidial and antifungal compounds were tested in vitro on infected hemolymph and cultured P. marinus cells and in vivo on infected oysters. In addition, acute toxicity to oysters was determined for six anticoccidials. In vitro experiments with infected hemolymph consisted of 24 h exposure of 0.2 mL hemolymph aliquots to concentrations ranging from 100 mg/L to 0.01 mg/L of amphotericin-B, amprolium, arprinocid, cycloheximide, lasalocid, malachite green, monensin, sulfadimethoxine, and a potentiated sulfadimethoxine, followed by incubation in fluid thioglycollate medium (FTM) to determine prezoosporangia ...


Colonial Virginia's Cooking Dynasty: Women's Spheres And Culinary Arts, Katharine E. Harbury Jan 1994

Colonial Virginia's Cooking Dynasty: Women's Spheres And Culinary Arts, Katharine E. Harbury

Dissertations, Theses, and Masters Projects

No abstract provided.


Novel Suicide Elements For Gene Disruption In Escherichia Coli, Brian Christopher Nicholson Jan 1994

Novel Suicide Elements For Gene Disruption In Escherichia Coli, Brian Christopher Nicholson

Dissertations, Theses, and Masters Projects

No abstract provided.


Cell Division In The Multicellular Marine Red Alga Agardhiella Subulata, Karel Joan Klepacki Jan 1994

Cell Division In The Multicellular Marine Red Alga Agardhiella Subulata, Karel Joan Klepacki

Dissertations, Theses, and Masters Projects

No abstract provided.


Reproductive Strategies In Asclepias Syriaca And Apocynum Cannabinum, Mariellen J. Soltys Jan 1994

Reproductive Strategies In Asclepias Syriaca And Apocynum Cannabinum, Mariellen J. Soltys

Dissertations, Theses, and Masters Projects

No abstract provided.


The Isolation And Characterization Of A Novel G-Protein-Coupled Receptor Involved In Angiogenesis, Rebecca Ruth Stucki Miles Jan 1994

The Isolation And Characterization Of A Novel G-Protein-Coupled Receptor Involved In Angiogenesis, Rebecca Ruth Stucki Miles

Dissertations, Theses, and Masters Projects

No abstract provided.


Xenopus Laevis Ribosomal Protein S1: Evidence For Regulation At The Transcriptional Level, Cleve Ray-Dean Sinor Jan 1994

Xenopus Laevis Ribosomal Protein S1: Evidence For Regulation At The Transcriptional Level, Cleve Ray-Dean Sinor

Dissertations, Theses, and Masters Projects

No abstract provided.


Functional Characterization Of The Electrophoretic Hemoglobin Polymorphism In The Atlantic Croaker (Micropogon Undulatus), Daniel Allen Shelly Jan 1994

Functional Characterization Of The Electrophoretic Hemoglobin Polymorphism In The Atlantic Croaker (Micropogon Undulatus), Daniel Allen Shelly

Dissertations, Theses, and Masters Projects

No abstract provided.


Social Influences On Reproductive Maturation In Female White-Footed Mice (Peromyscus Leucopus Noveboracensis), Michelle Lee Mabry Jan 1994

Social Influences On Reproductive Maturation In Female White-Footed Mice (Peromyscus Leucopus Noveboracensis), Michelle Lee Mabry

Dissertations, Theses, and Masters Projects

No abstract provided.


The Vascular Flora Of The Tar Bay And Powell Creek Watersheds, Prince George County, Virginia, Mark Eugene Mort Jan 1994

The Vascular Flora Of The Tar Bay And Powell Creek Watersheds, Prince George County, Virginia, Mark Eugene Mort

Dissertations, Theses, and Masters Projects

No abstract provided.


Increase In Rem Density: A Biological Marker Of Bulimia And Depression Or An Artifact Of Perceived Stress?, Jeannie Hee-Jin Koo Jan 1994

Increase In Rem Density: A Biological Marker Of Bulimia And Depression Or An Artifact Of Perceived Stress?, Jeannie Hee-Jin Koo

Dissertations, Theses, and Masters Projects

No abstract provided.


Mitochondrial Dna Variation In Natural And Cultured Populations Of The Bay Scallop, Argopecten Irradians (Lamarck) And The Calico Scallop, Argopecten Gibbus (Dall), Sandra Grace Blake Jan 1994

Mitochondrial Dna Variation In Natural And Cultured Populations Of The Bay Scallop, Argopecten Irradians (Lamarck) And The Calico Scallop, Argopecten Gibbus (Dall), Sandra Grace Blake

Dissertations, Theses, and Masters Projects

No abstract provided.


Comparative Toxicity Of Creosote And Creosote Contaminated Sediments, Padma T. Venkatraman Jan 1994

Comparative Toxicity Of Creosote And Creosote Contaminated Sediments, Padma T. Venkatraman

Dissertations, Theses, and Masters Projects

No abstract provided.


Food, Feeding, And Length-Weight Relationships Of Young-Of-The-Year Striped Bass, Morone Saxatilis And Young-Of-The-Year White Perch, Morone Americana, Paul J. Rudershausen Jan 1994

Food, Feeding, And Length-Weight Relationships Of Young-Of-The-Year Striped Bass, Morone Saxatilis And Young-Of-The-Year White Perch, Morone Americana, Paul J. Rudershausen

Dissertations, Theses, and Masters Projects

No abstract provided.


Uptake Routes Of Benzo[A]Pyrene In An Estuarine Killifish: Cytochrome P4501a Immunohistochemistry Using Whole Fish, Maria Karin Cochran Jan 1994

Uptake Routes Of Benzo[A]Pyrene In An Estuarine Killifish: Cytochrome P4501a Immunohistochemistry Using Whole Fish, Maria Karin Cochran

Dissertations, Theses, and Masters Projects

No abstract provided.


The Role Of Predation On Zostera Marina L (Eelgrass) Seed Abundance, James Fishman Jan 1994

The Role Of Predation On Zostera Marina L (Eelgrass) Seed Abundance, James Fishman

Dissertations, Theses, and Masters Projects

No abstract provided.


Toxicity Resistance In Mummichog (Fundulus Heteroclitus) From A Chemically Contaminated Environment, Cynthia A. H. Williams Jan 1994

Toxicity Resistance In Mummichog (Fundulus Heteroclitus) From A Chemically Contaminated Environment, Cynthia A. H. Williams

Dissertations, Theses, and Masters Projects

No abstract provided.


Contributions To The Early Life Histories Of Alewife (Alosa Pseudoharengus) And Blueback Herring (Alosa Aestivalis): Rearing, Identification, Ageing, And Ecology, Edward Norbert Sismour Jan 1994

Contributions To The Early Life Histories Of Alewife (Alosa Pseudoharengus) And Blueback Herring (Alosa Aestivalis): Rearing, Identification, Ageing, And Ecology, Edward Norbert Sismour

Dissertations, Theses, and Masters Projects

Early life histories of alewife (Alosa pseudoharengus) and blueback herring (A. aestivalis), collectively known as river herring, are poorly documented for Chesapeake Bay populations. Improved knowledge of these early life histories potentially will aid fisheries, habitat and resource management. Investigations were conducted following two lines. First, alewife and blueback herring larvae reared from eggs were used to investigate methods for species identification and to validate the otolith increment method for age determination. Blueback herring larvae hatched from naturally-spawned eggs were reared to age 24 d. Alewife and blueback herring larvae hatched from artificially-spawned eggs were reared to age 32 d ...


Age, Growth And Population Dynamics Of The Sandbar Shark, Carcharhinus Plumbeus, At Different Population Levels, Thomas R. Sminkey Jan 1994

Age, Growth And Population Dynamics Of The Sandbar Shark, Carcharhinus Plumbeus, At Different Population Levels, Thomas R. Sminkey

Dissertations, Theses, and Masters Projects

The objectives of my research were to test the hypothesis that compensatory (density-dependent) growth of sandbar shark (Carcharhinus plumbeus) occurred after severe population reduction, to describe the juvenile sandbar shark fauna present in the Chesapeake Bay during 1980-81 and 1990-93, and to perform demographic analyses to examine potential population growth. Age and growth of sandbar sharks were investigated by counting rings in vertebral samples collected in 1980-81 and 1991-92. Age at maturity was 15-16 years for both sample periods and both sexes. For sexes combined, the von Bertalanffy growth parameters were L&\sb{lcub}\infty{rcub}& = 199 cm precaudal length ...


Investigations Into Cataract Formation In Sciaenid Fish Species From The Elizabeth River, Chesapeake Bay, Virginia, Christopher D. Williams Jan 1994

Investigations Into Cataract Formation In Sciaenid Fish Species From The Elizabeth River, Chesapeake Bay, Virginia, Christopher D. Williams

Dissertations, Theses, and Masters Projects

Cataract formation in the Elizabeth River (ER) has been reported since 1986. Previous studies have concentrated on describing cataract as a function of exposure to polluted sediments, especially polycyclic aromatic hydrocarbons (PAH). These studies, however, have not examined what processes might be involved in fish cataractogenesis. The overall objective of this research was to identify important processes associated with the early development of cataract in feral fish populations. Field studies were used to systematically examine cataract development. Cataract in sciaenids was not associated with previously described cataractogenic factors, but could be linked to contaminated sediments of the ER. Cataract was ...