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Full-Text Articles in Life Sciences

Estimating Abundance And Annual Production Of Striped Bass Eggs With In Situ Silhouette Photography, John Douglas Field Jan 1991

Estimating Abundance And Annual Production Of Striped Bass Eggs With In Situ Silhouette Photography, John Douglas Field

Dissertations, Theses, and Masters Projects

No abstract provided.


Food And Feeding Of Northern Bluefin Tuna (Thunnus Thynnus) And Yellowfin Tuna (Thunnus Albarcares): A Comparative Study Of The Food And Feeding Habits Of The Northern Bluefin Tuna Off The Coast Of Virginia, Charles Gilbert Barr Jan 1991

Food And Feeding Of Northern Bluefin Tuna (Thunnus Thynnus) And Yellowfin Tuna (Thunnus Albarcares): A Comparative Study Of The Food And Feeding Habits Of The Northern Bluefin Tuna Off The Coast Of Virginia, Charles Gilbert Barr

Dissertations, Theses, and Masters Projects

No abstract provided.


Temporal And Spatial Response Of Two Tidal Marsh Species To Salinity Changes In The Pamunkey River, Laura R. Mitchell Jan 1991

Temporal And Spatial Response Of Two Tidal Marsh Species To Salinity Changes In The Pamunkey River, Laura R. Mitchell

Dissertations, Theses, and Masters Projects

No abstract provided.


The Relationship Of Habitat And Spatial Scale Upon The Developmental State And Settlement Of Blue Crab Postlarvae In Chesapeake Bay, Karen S. Metcalf Jan 1991

The Relationship Of Habitat And Spatial Scale Upon The Developmental State And Settlement Of Blue Crab Postlarvae In Chesapeake Bay, Karen S. Metcalf

Dissertations, Theses, and Masters Projects

No abstract provided.


Nutrient Standing Stocks And Partitioning In A Forested Coastal Plain Watershed: Groundwater, Stream And Marsh Creek, Sandra A. Hartenstine Jan 1991

Nutrient Standing Stocks And Partitioning In A Forested Coastal Plain Watershed: Groundwater, Stream And Marsh Creek, Sandra A. Hartenstine

Dissertations, Theses, and Masters Projects

No abstract provided.


Ecology Of Estuarine Fish Assemblages In Patos Lagoon, Brazil (32 Degrees S), And York River, Usa (37 Degrees N), With Review Of Zoogeography Of Fishes In Western Atlantic Warm-Temperate And Tropical Estuaries, Joao P. Vieira Jan 1991

Ecology Of Estuarine Fish Assemblages In Patos Lagoon, Brazil (32 Degrees S), And York River, Usa (37 Degrees N), With Review Of Zoogeography Of Fishes In Western Atlantic Warm-Temperate And Tropical Estuaries, Joao P. Vieira

Dissertations, Theses, and Masters Projects

The first two chapters of this study examine faunal composition and latitudinal patterns in diversity of fishes in warm-temperate and tropical estuarine waters of the western Atlantic from La Plata River (35&\sp\circ&S), Argentina, to Chesapeake Bay (37&\sp\circ&N), USA (33 faunal reports). Species distributions generally corresponded with previously recognized marine zoogeographic regions, and cluster analyses also showed that faunal similarity among estuarine sampling sites was related to the type of sampling gear used and to the type of habitat that was sampled in each estuary. The total number of fish species reported is positively related ...


Stock Enhancement Of Caribbean Spiny Lobster, Panulirus Argus Latrielle, Using Artificial Shelters: Patterns Of Survival And Dynamics Of Shelter Selection, David Bryan Eggleston Jan 1991

Stock Enhancement Of Caribbean Spiny Lobster, Panulirus Argus Latrielle, Using Artificial Shelters: Patterns Of Survival And Dynamics Of Shelter Selection, David Bryan Eggleston

Dissertations, Theses, and Masters Projects

Field tethering experiments in seagrass beds of Bahia de la Ascension, Mexico examined the impact of different-sized artificial shelters upon survival of three juvenile size-classes of the Caribbean spiny lobster, Panulirus argus. The artificial shelters were concrete structures (casitas) that simulate lobster dens. In the tethering experiments, spiny lobster survival was generally higher in smaller than larger casitas, though the effect depended upon the relationship between lobster and shelter size. Thus, spiny lobster survival depends not only upon the availability of shelter, but also on the scaling between shelter size and lobster size. These results suggest that placement of appropriately-scaled ...


Factors Affecting Survival Of Early Life Stages Of Striped Bass, John Clarke Mcgovern Jan 1991

Factors Affecting Survival Of Early Life Stages Of Striped Bass, John Clarke Mcgovern

Dissertations, Theses, and Masters Projects

In 1988 laboratory presentations, bay anchovy, and Atlantic menhaden tested positive as potential predators. Consumption of striped bass larvae by bay anchovy increased at higher prey densities to a maximum of 42 larvae/h at prey densities of 1,650/m&\sp3&. Examination of 229 stomachs of bay anchovy collected during peak spawning in 1988 and 1989 provided direct evidence of predation on striped bass eggs and larvae. The relationship between patterns of survival inferred from the back-calculation of juvenile hatchdates were compared with data sets describing predator and prey fields, egg production, food abundance, and changing environmental conditions during ...


The Call Of The Wild: Investigating The Relationship Between Adventure Education, Character Development, And The College Curriculum, Barbara Ann Klingman Jan 1991

The Call Of The Wild: Investigating The Relationship Between Adventure Education, Character Development, And The College Curriculum, Barbara Ann Klingman

Dissertations, Theses, and Masters Projects

The purpose of this research was to investigate the potential utilization of adventure education programs to provide an effective and innovative alternative for enhancing the college undergraduate experience. Initial research consisted of performing an indepth study of higher education's curriculum reform literature and studies and literature on adventure education programs. Specific components of the curriculum reform literature regarding character development were then correlated with attributes discovered in the adventure education literature. The interrelationship that developed provided a theoretical rationale from which to propose that adventure education programs could indeed address many of the objectives of the recommended curriculum.;The ...


Contaminant Accumulation In Hard And Soft Shell Blue Crabs From An Urban Subestuary, Robert F. Mothershead Jan 1991

Contaminant Accumulation In Hard And Soft Shell Blue Crabs From An Urban Subestuary, Robert F. Mothershead

Dissertations, Theses, and Masters Projects

Muscle and hepatopancreas of blue crabs (Callinectes sapidus), collected from the Elizabeth River, Virginia, contained residues of polycyclic aromatic hydrocarbon (PAHs}, polychlorinated biphenyls (PCBs) and organochlorine pesticides. Analytical procedures involved dichloromethane extraction of lyophilized tissue, followed by molecular size and polarity-based purification of the extract. capillary gas chromatography with flame ionization detection and electrolytic conductivity detection was used for quantitation and tentative identification of the xenobiotic compounds. Mass spectrometry was used for confirmation of these identities. Contaminant concentrations were greater in hepatopancreas than in muscle in crabs from every site examined. Hepatopancreas PAH burdens were as high as 11 mg ...


Comparative Ecology, Morphology, And Population Genetics Of Black Triggerfish, Melichthys Niger, Kathryn D. Kavanagh Jan 1991

Comparative Ecology, Morphology, And Population Genetics Of Black Triggerfish, Melichthys Niger, Kathryn D. Kavanagh

Dissertations, Theses, and Masters Projects

No abstract provided.


Sediment Inorganic Nitrogen Stocks And Root-Rhizome Ammonium Uptake By Eelgrass (Zostera Marina L) In The Lower Chesapeake Bay, Christopher P. Buzzelli Jan 1991

Sediment Inorganic Nitrogen Stocks And Root-Rhizome Ammonium Uptake By Eelgrass (Zostera Marina L) In The Lower Chesapeake Bay, Christopher P. Buzzelli

Dissertations, Theses, and Masters Projects

No abstract provided.


Passive Diffusivity Of Water And Sodium Through The Stratum Corneum Of Three Species Of Aquatic Snakes, Joseph Hamilton Brown Jan 1991

Passive Diffusivity Of Water And Sodium Through The Stratum Corneum Of Three Species Of Aquatic Snakes, Joseph Hamilton Brown

Dissertations, Theses, and Masters Projects

No abstract provided.


Contrasts Between Tidal Freshwater And Estuarine Phytoplankton Growth On Intracellular And Recycled Nutrient Pools Over A Summer-Winter Seasonal Transition, Dean Douglas Kindler Jan 1991

Contrasts Between Tidal Freshwater And Estuarine Phytoplankton Growth On Intracellular And Recycled Nutrient Pools Over A Summer-Winter Seasonal Transition, Dean Douglas Kindler

Dissertations, Theses, and Masters Projects

No abstract provided.


Evaluation Of A Technique To Quantify Lipids In Bivalve Larvae Crassostrea Virginica Gmelin, Using Nile Red And Epiflourescence Microscopy, Laura Liliana Castell Perez Jan 1991

Evaluation Of A Technique To Quantify Lipids In Bivalve Larvae Crassostrea Virginica Gmelin, Using Nile Red And Epiflourescence Microscopy, Laura Liliana Castell Perez

Dissertations, Theses, and Masters Projects

No abstract provided.


Population Biology Of The Polychaete Loimia Medusa (Savigny) On A Tidal Sand Flat Of The York River, Chesapeake Bay, Rochelle D. Seitz Jan 1991

Population Biology Of The Polychaete Loimia Medusa (Savigny) On A Tidal Sand Flat Of The York River, Chesapeake Bay, Rochelle D. Seitz

Dissertations, Theses, and Masters Projects

No abstract provided.


A Comparison Of Meristics And Morphometrics Between Two Strains Of Pond Cultured Striped Bass (Morone Saxatilis), Steven Gornak Jan 1991

A Comparison Of Meristics And Morphometrics Between Two Strains Of Pond Cultured Striped Bass (Morone Saxatilis), Steven Gornak

Dissertations, Theses, and Masters Projects

No abstract provided.


Interactions Between Temperature And Tributlytin (Tbt) Toxicity To The Estuarine Mysid, Mysidopsis Bahia, Prentiss H. Balcom Jan 1991

Interactions Between Temperature And Tributlytin (Tbt) Toxicity To The Estuarine Mysid, Mysidopsis Bahia, Prentiss H. Balcom

Dissertations, Theses, and Masters Projects

No abstract provided.


Life History Of The Bay Anchovy, Anchoa Mitchilli, In Chesapeake Bay, Jiangang Luo Jan 1991

Life History Of The Bay Anchovy, Anchoa Mitchilli, In Chesapeake Bay, Jiangang Luo

Dissertations, Theses, and Masters Projects

In lower Chesapeake Bay, the spawning season of the bay anchovy Anchoa mitchilli in 1988 was from early May to mid-September. Spawning was temporally synchronized and lasted for about 1.5 h each night. Spawning frequency per individual was every 4 d in early June and 1.3-1.9 d in other months. Batch fecundity was a linear function of fork length and body weight; regression slopes on 6 July and 4 August were significantly higher than those on 6 June and 31 August. Estimated mean total spawnings per female in 1988 was 54. Total egg production for a fish ...


Analysis Of Vegetation Patterns In A Tidal Freshwater Marsh, James E. Perry Iii Jan 1991

Analysis Of Vegetation Patterns In A Tidal Freshwater Marsh, James E. Perry Iii

Dissertations, Theses, and Masters Projects

Tidal freshwater wetlands represent a transitional wetland between tidal salt marshes and non-tidal wetlands. as such, they exhibit some of the vegetation characteristics of both systems. If the changes in the vegetation pattern favor the characteristics of one system over the other, the changes may be an indication of changes in the environmental conditions of the estuarine ecosystem that favors that system. Unfortunately, little is known of the temporal and spatial changes that occur in the vegetation patterns of tidal freshwater marshes of the mid-Atlantic coastal region. In 1987 a vegetation analysis was done on a 60 hectare section of ...


Vegetation Ecology Of Tidal Freshwater Swamps Of The Lower Chesapeake Bay, United States Of America, Richard D. Rheinhardt Jan 1991

Vegetation Ecology Of Tidal Freshwater Swamps Of The Lower Chesapeake Bay, United States Of America, Richard D. Rheinhardt

Dissertations, Theses, and Masters Projects

Woody and herbaceous vegetation were sampled in 23 tidal swamps along a tidal freshwater tributary of lower Chesapeake Bay. Four vegetative categories were ordinated with Detrended Correspondence Analysis (DECORANA). Species distribution patterns of each strata were compared with respect to edaphic factors, a wetness index, and mean water table depth. Woody species are restricted to hummocks (topographic highs). Hummocks drain as quickly as the tide drops and so are partially inundated for only short periods each day. Although low in canopy diversity, tidal swamps are floristically rich in herbaceous and woody understory species, ranking them among the most speciose in ...


Monooxygenase Induction And Lethality As Endpoints In Aquatic Toxicology, Daniel W. Sved Jan 1991

Monooxygenase Induction And Lethality As Endpoints In Aquatic Toxicology, Daniel W. Sved

Dissertations, Theses, and Masters Projects

Spot, Leiostomus xanthurus, were exposed to suspended sediments (&\approx&20 mg/L) contaminated with polycyclic aromatic hydrocarbons (PAH) in a laboratory flow-through system to evaluate the applicability of hepatic ethoxyresorufin O-deethylase (EROD) induction as an indicator of PAH exposure. PAH sources tested were coal-tar creosote (CTC), a low molecular weight fraction of creosote (LMWF), and a high molecular weight fraction of creosote (HMWF). A standard 96-h acute toxicity test was conducted to ensure that PAH concentrations tested in induction studies were sub-acutely toxic. The 96-h LC50 for spot was 1740 &\mu&g PAH/L (95% confidence interval = 1480-2060 &\mu&g PAH/L). The lowest concentration producing an observable effect in 96 h was 560 &\mu&g PAH/L; no effects were observed for spot exposed to 250 &\mu&g PAH/L for 96 h. Induction of hepatic EROD activity occurred rapidly in fish exposed to high environmentally realistic concentrations of CTC or the HMWF, but not the LMWF. Maximal induction (30-fold) occurred in fish exposed for 48 h to 150 &\mu&g PAH/L. Induction was concentration-dependent up to 150 &\mu&g PAH/L; at 320 &\mu&g PAH/L induction was 14-fold. EROD activity decreased upon further exposure; by day 7, EROD activity was not significantly different than that on day 0. EROD activity in fish exposed to 16 &\mu&g PAH/L was not consistently higher than that in control fish. Spot exposed to at least 70 &\mu&g PAH/L from CTC or the HMWF experienced severe fin erosion, epidermal lesions, and mortality beginning a few days after maximal EROD induction occurred. No relationship between EROD induction and whole animal responses is implied, only that EROD induction ...


A Preliminary Study Of The Effect Or Impairment Of The Vomeronasal Organ On The Recovery From Reproductive Inhibition In Prairie Deer Mice From Laboratory Populations, Tama Elaine Cathers Jan 1991

A Preliminary Study Of The Effect Or Impairment Of The Vomeronasal Organ On The Recovery From Reproductive Inhibition In Prairie Deer Mice From Laboratory Populations, Tama Elaine Cathers

Dissertations, Theses, and Masters Projects

No abstract provided.


Immunological Identification Of A Centrin Homologue In The Red Alga Gracilaria Tikvahiae, Christopher Lee Dassler Jan 1991

Immunological Identification Of A Centrin Homologue In The Red Alga Gracilaria Tikvahiae, Christopher Lee Dassler

Dissertations, Theses, and Masters Projects

No abstract provided.


Physiological Responding In Anhedonic And Perceptually Aberrant College Students, Kathryn Elizabeth Stauffer Jan 1991

Physiological Responding In Anhedonic And Perceptually Aberrant College Students, Kathryn Elizabeth Stauffer

Dissertations, Theses, and Masters Projects

No abstract provided.