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Articles 1 - 29 of 29
Full-Text Articles in Life Sciences
Allozyme Variation In American Ginseng, Panax Quinquefolius L (Araliaceae): Implications For Management Of Wild And Cultivated Populations, Holly Jean Grubbs
Allozyme Variation In American Ginseng, Panax Quinquefolius L (Araliaceae): Implications For Management Of Wild And Cultivated Populations, Holly Jean Grubbs
Dissertations, Theses, and Masters Projects
No abstract provided.
Assessment Of Development Impacts On Coastal Zone: Integrated Approach, Northampton County, Eastern Shore, Virginia, Sarunas Zableckis
Assessment Of Development Impacts On Coastal Zone: Integrated Approach, Northampton County, Eastern Shore, Virginia, Sarunas Zableckis
Dissertations, Theses, and Masters Projects
No abstract provided.
New Dimensionless Indices Of Structural Habitat Complexity, Aaron Bartholomew
New Dimensionless Indices Of Structural Habitat Complexity, Aaron Bartholomew
Dissertations, Theses, and Masters Projects
Ecologists have long known that complex habitats often provide prey with refugia from predation in a wide variety of habitat types and for a wide variety of prey species. Despite the recognized importance of structural habitat complexity, ecologists have measured complexity in many different ways. I propose four new indices of structural habitat complexity that are dimensionless, that can be applied across various habitat types and scales, and that directly measure how structural complexity interferes with a predator's foraging ability. These indices are: (1) Ct/At, the total area of cover within a habitat (Ct) divided by the area of the …
Use Of Pop-Up Satellite Tag Technology To Estimate Survival Of Blue Marlin (Makaira Nigricans) Released From Pelagic Longline Gear, David Kerstetter
Use Of Pop-Up Satellite Tag Technology To Estimate Survival Of Blue Marlin (Makaira Nigricans) Released From Pelagic Longline Gear, David Kerstetter
Dissertations, Theses, and Masters Projects
No abstract provided.
Evaluation Of Opercular Bones For Aging Eight Species Of Chesapeake Bay Fishes, Ann M. Sipe
Evaluation Of Opercular Bones For Aging Eight Species Of Chesapeake Bay Fishes, Ann M. Sipe
Dissertations, Theses, and Masters Projects
No abstract provided.
The Energetics Of Seasonal Reproductive Inhibition In White-Footed Mice, Michelle E. Rightler
The Energetics Of Seasonal Reproductive Inhibition In White-Footed Mice, Michelle E. Rightler
Dissertations, Theses, and Masters Projects
No abstract provided.
Growth Patterns Of Three Species Of Catfish (Ictaluridae) From Three Virginia Tributaries Of The Chesapeake Bay, William J. Connelly
Growth Patterns Of Three Species Of Catfish (Ictaluridae) From Three Virginia Tributaries Of The Chesapeake Bay, William J. Connelly
Dissertations, Theses, and Masters Projects
No abstract provided.
Morphological Variation Of Three Populations Of The Veined Rapa Whelk, Rapana Venosa, An Invasive Predatory Gastropod Species, Rebecca A. Green
Morphological Variation Of Three Populations Of The Veined Rapa Whelk, Rapana Venosa, An Invasive Predatory Gastropod Species, Rebecca A. Green
Dissertations, Theses, and Masters Projects
No abstract provided.
Molecular Characterization Of Cultured Perkinsus Marinus Isolates, Gwynne D. Brown
Molecular Characterization Of Cultured Perkinsus Marinus Isolates, Gwynne D. Brown
Dissertations, Theses, and Masters Projects
Perkinsus marinus is the causative agent of the oyster disease Dermo in the eastern oyster, Crassostrea virginica. In vitro propagation of the parasite has led to the establishment of multiple isolates by several investigators. Little work, however, has been done to characterize different isolates. In this study multiple isolates were examined for genetic and biochemical diversity. at two loci, the ITS region and the ATAN region, there was as much intra-isolate genetic variation among DNA sequences of some isolates as there was inter-isolate variation. Variation was also observed at a third loci, a subtilisin-like serine protease gene. This is the …
Heat Shock Protein (Hsp70) Response In The Eastern Oyster, Crassostrea Virginica, Exposed To Various Contaminants (Pahs, Pcbs And Cadmium), Luis A. Cruz Rodriguez
Heat Shock Protein (Hsp70) Response In The Eastern Oyster, Crassostrea Virginica, Exposed To Various Contaminants (Pahs, Pcbs And Cadmium), Luis A. Cruz Rodriguez
Dissertations, Theses, and Masters Projects
The stress protein response has been proposed as a general indicator of exposure to stress as their expression might integrate overall biological impact and interactions among multiple stressors. as a marker of contaminant effects, a major advantage is the premise of higher sensitivity over other indices such as condition index, scope for growth and survival. Laboratory exposure to suspended field contaminated sediments (SFCS) elicited a stress protein response (HSP70) in the eastern oyster, ( Crassostrea virginica). The stress response probably resulted from the combined effect of various contaminants including PAHs, metals and PCBs. Exposure to 1--2g suspended clay particles spiked …
Persistent Organic Pollutant Transport And Fate: Assessment By Molecular Tracers, Padma T. Venkatraman
Persistent Organic Pollutant Transport And Fate: Assessment By Molecular Tracers, Padma T. Venkatraman
Dissertations, Theses, and Masters Projects
Persistent organic pollutants (POPs) such as the organochlorine pesticide hexachlorocyclohexane (HCH) may undergo atmospheric transport and accumulate in regions remote from the source. It is important to develop techniques to help apportion source and identify transport or transformation processes to which HCHs and other mobile POPs may be subjected. Molecular tracers such as compound specific stable isotope and enantiomer ratios (ERs) may prove valuable in studying POP fate and transport. The objective of this study was to further develop the use of these two novel geochemical tools to evaluate the sources, transport and environmental fate of POPs, in the context …
The Impact Of Marine Reserves On Exploited Species With Complex Life Histories: A Modeling Study Using The Caribbean Spiny Lobster In Exuma Sound, Bahamas, William T. Stockhausen
The Impact Of Marine Reserves On Exploited Species With Complex Life Histories: A Modeling Study Using The Caribbean Spiny Lobster In Exuma Sound, Bahamas, William T. Stockhausen
Dissertations, Theses, and Masters Projects
Most benthic invertebrates and reef-associated fish undergo a dispersive, planktonic larval stage prior to settlement and metamorphosis into the juvenile and adult stages. In some species, settlement may be decoupled from adult abundance at local spatial scales if hydrodynamic conditions or larval behavior do not promote local retention. Similarly, spatial variability in postsettlement mortality or secondary dispersal by juveniles and adults may decouple spatial patterns of adult abundance from those of settlement. as a consequence, spatial patterns of settlement and adult abundance may be functionally related in a complex fashion. Whether biotic/environmental factors control spatial patterns of abundance may have …
Application Of The Genetic Algorithm To An Ecological Simulation, William J. Seufzer
Application Of The Genetic Algorithm To An Ecological Simulation, William J. Seufzer
Dissertations, Theses, and Masters Projects
A computational framework is built and demonstrated which is capable of testing plant growth strategies. The framework consists of Vgrass, a carbon based simulation model of a single Zostera marina plant, and the genetic algorithm (GA). Vgrass is based on published seagrass models, published photosynthetic data, and general plant physiology information. The model grows individual leaves whose initiation times are based on degree-day intervals. Leaf size is computed and combined with shoot density to compute population self shading. Leaf length is an emergent property since leaf growth is limited by light attenuation caused by self shading. The model is able …
Genetic Investigation Of Interspecific And Intraspecific Relationships Within The Genus Rapana, Arminda L. Gensler
Genetic Investigation Of Interspecific And Intraspecific Relationships Within The Genus Rapana, Arminda L. Gensler
Dissertations, Theses, and Masters Projects
No abstract provided.
Effects Of Light And Salinity Stress On Vallisneria Americana (Wild Celery), Gail T. French
Effects Of Light And Salinity Stress On Vallisneria Americana (Wild Celery), Gail T. French
Dissertations, Theses, and Masters Projects
No abstract provided.
A Descriptive Study Of The Reproductive Biology Of The Veined Rapa Whelk (Rapana Venosa) In The Chesapeake Bay, Erica S. Westcott
A Descriptive Study Of The Reproductive Biology Of The Veined Rapa Whelk (Rapana Venosa) In The Chesapeake Bay, Erica S. Westcott
Dissertations, Theses, and Masters Projects
No abstract provided.
Spatial And Temporal Variation In Plant Communities Of Three Tidal Salt Marshes Along The York River, Virginia, Rosemary E. Laird
Spatial And Temporal Variation In Plant Communities Of Three Tidal Salt Marshes Along The York River, Virginia, Rosemary E. Laird
Dissertations, Theses, and Masters Projects
No abstract provided.
Reproductive Biology Of Atlantic Croaker, Micropogonias Undulatus, In The Chesapeake Bay, Elizabeth Shaw Watkins
Reproductive Biology Of Atlantic Croaker, Micropogonias Undulatus, In The Chesapeake Bay, Elizabeth Shaw Watkins
Dissertations, Theses, and Masters Projects
No abstract provided.
Life History Attributes Of Mid-Atlantic Menidia Menidia (Pisces: Atherinidae) And A Comparison With Northern (Massachusetts) And Southern (South Carolina) Populations, Richard K. Holmquist
Life History Attributes Of Mid-Atlantic Menidia Menidia (Pisces: Atherinidae) And A Comparison With Northern (Massachusetts) And Southern (South Carolina) Populations, Richard K. Holmquist
Dissertations, Theses, and Masters Projects
No abstract provided.
Spatial And Temporal Variability Of Physical And Biological Mixing In The York River Subestuary, Tara A. Kniskern
Spatial And Temporal Variability Of Physical And Biological Mixing In The York River Subestuary, Tara A. Kniskern
Dissertations, Theses, and Masters Projects
No abstract provided.
Age, Growth, And Mortality Of Atlantic Croaker, Micropogonias Undulatus, In The Chesapeake Bay Region, John R. Foster
Age, Growth, And Mortality Of Atlantic Croaker, Micropogonias Undulatus, In The Chesapeake Bay Region, John R. Foster
Dissertations, Theses, and Masters Projects
No abstract provided.
Nursery Delineation, Habitat Utilization, Movements, And Migration Of Juvenile Carcharhinus Plumbeus In Chesapeake Bay, Virginia, United States Of America, R. Dean. Grubbs
Dissertations, Theses, and Masters Projects
Chesapeake Bay is possibly the largest summer nursery for Carcharhinus plumbeus in the western Atlantic. Longline sampling conducted from 1990--1999 was used to delineate this nursery spatially and temporally. Catch data from 83 longline stations sampled throughout the Virginia Chesapeake Bay were analyzed as a function of nine physical and environmental variables to delineate this nursery spatially. Tree-based models determined which variables best discriminated between stations with high and low catches and indicated that complex distribution patterns could be adequately modeled with few variables. The highest abundance of juvenile sharks was predicted where salinity was greater than 20.5 and depth …
Effects Of Humic Acids And Salinity On Pesticide Bioavailability And Toxicity As Estimated By Spme And Toxicity Tests, Laurent C. Mézin
Effects Of Humic Acids And Salinity On Pesticide Bioavailability And Toxicity As Estimated By Spme And Toxicity Tests, Laurent C. Mézin
Dissertations, Theses, and Masters Projects
The interactive effects of humic acids (HAs) and salinity on the bioavailability and toxicity of the pesticides chlorpyrifos and 4,4'-dichlorodiphenyltrichloroethane (DDT) were investigated. The effects of various HAs on the toxicity of chlorpyrifos were initially assessed with the chronic MicrotoxRTM test. Environmentally relevant concentrations of Aldrich, Peat, Leonardite and Suwannee River HAs had no significant effect on the toxicity of either chlorpyrifos or copper (Cu), the test's positive control. as reductions in contaminant toxicity had previously been reported for some contaminants by HAs, it appeared that salinity might be a mitigating factor. Thus salinity effects were further investigated with Aldrich …
Vitellogenin -- A Biomarker Of Exposure To Environmental Estrogens For Mummichog (Fundulus Heteroclitus) From A Creosote-Contaminated Site?, Sara Mirabilio
Vitellogenin -- A Biomarker Of Exposure To Environmental Estrogens For Mummichog (Fundulus Heteroclitus) From A Creosote-Contaminated Site?, Sara Mirabilio
Dissertations, Theses, and Masters Projects
Vitellogenin (VTG) is widely used as a biomarker for environmental estrogens and reproductive disruption in fish. Vitellogenesis is the process by which yolk is formed. The endpoint is most sensitive in male fish where vitellogenesis is an abnormal process. Research examining effects of environmental mixtures of chemicals (e.g. creosote) on vitellogenesis is limited. This study examines plasma VTG expression in both male and female mummichog, Fundulus heteroclitus, collected from a creosote-contaminated site and two reference sites in lower Chesapeake Bay, USA, and in wild-caught male reference fish exposed in the laboratory to creosote-contaminated sediment. Further, this study uses tissue somatic …
Tr Phosphorylation & Nuclear Import, James B. Nicoll
Tr Phosphorylation & Nuclear Import, James B. Nicoll
Dissertations, Theses, and Masters Projects
No abstract provided.
Adrenal Expression Of Cyp17 And Hsd3b1 Mrna In Peromyscus Maniculatus Bairdii, Brian Thomas Lovitt
Adrenal Expression Of Cyp17 And Hsd3b1 Mrna In Peromyscus Maniculatus Bairdii, Brian Thomas Lovitt
Dissertations, Theses, and Masters Projects
No abstract provided.
Beyond Ability: Effects Of Caffeine And Impulsivity On Academic And Creative Performance, Sara E. Chambers
Beyond Ability: Effects Of Caffeine And Impulsivity On Academic And Creative Performance, Sara E. Chambers
Dissertations, Theses, and Masters Projects
No abstract provided.
Differential Migration, Molt And Departure Date In White-Throated Sparrows, Zonotrichia Albicollis, Kendell Jenkins
Differential Migration, Molt And Departure Date In White-Throated Sparrows, Zonotrichia Albicollis, Kendell Jenkins
Dissertations, Theses, and Masters Projects
No abstract provided.
Age-Related Differences In The Prey-Dropping Behavior Of Herring Gulls (Larus Argentatus), Eric G. Dunlavey
Age-Related Differences In The Prey-Dropping Behavior Of Herring Gulls (Larus Argentatus), Eric G. Dunlavey
Dissertations, Theses, and Masters Projects
No abstract provided.