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Full-Text Articles in Life Sciences
Patterns Of Habitat Utilization In 0-Age Summer Flounder (Paralichthys Dentatus), David M. Wyanski
Patterns Of Habitat Utilization In 0-Age Summer Flounder (Paralichthys Dentatus), David M. Wyanski
Dissertations, Theses, and Masters Projects
No abstract provided.
Population Dynamics Of Young-Of-The-Year Striped Bass, Morone Saxatilis, Populations, Based On Daily Otolith Increments, Lisa L. Kline
Population Dynamics Of Young-Of-The-Year Striped Bass, Morone Saxatilis, Populations, Based On Daily Otolith Increments, Lisa L. Kline
Dissertations, Theses, and Masters Projects
Validation of daily increment deposition in otoliths of juvenile striped bass up to 80 days of age was provided through sequential sacrifice of known age hatchery-reared fish in 1987 and 1989, and through tetracycline marking of otoliths of cage-cultured striped bass in 1989. Ages of fish between 80-110 days old were consistently underestimated by 1-3 growth increments. Known age juvenile striped bass were raised in the laboratory in 1989 under controlled environmental conditions. These experiments provided evidence of an endogenous circadian rhythm controlling daily increment deposition in juvenile striped bass otoliths. Juvenile striped bass were collected in the 4 Virginia …
Relative Effects Of Nutrient Enrichment And Grazing On Epiphyton-Macrophyte (Zostera Marina L.) Dynamics, Hilary A. Neckles
Relative Effects Of Nutrient Enrichment And Grazing On Epiphyton-Macrophyte (Zostera Marina L.) Dynamics, Hilary A. Neckles
Dissertations, Theses, and Masters Projects
Dissolved nutrient concentrations and invertebrate grazing activity regulate epiphytic biomass. Because epiphyton may limit light and carbon at leaf surfaces and the consequent productivity of submerged macrophytes, factors which influence epiphytic biomass may indirectly affect macrophyte abundance. I measured the simultaneous effects of water column nutrients (ambient or 3x ambient concentrations of nitrogen and phosphorus) and grazing (presence or absence of epifaunal community) on epiphyton and macrophytes seasonally in eelgrass (Zostera marina L.) microcosms on lower Chesapeake Bay. Grazing was more important than nutrients in controlling accrual of total epiphytic biomass, although effects on epiphytic components varied; numbers of diatoms …
The Gametogenic Cycle Of Placopecten Magellanicus (Gmelin) In The Mid-Atlantic Bight, Anne Catherine Schmitzer
The Gametogenic Cycle Of Placopecten Magellanicus (Gmelin) In The Mid-Atlantic Bight, Anne Catherine Schmitzer
Dissertations, Theses, and Masters Projects
No abstract provided.
The Effect Of Nitrogen And Phosphorus Supply Ratios And Dilution Rate On Phosphorus Uptake And Mineralization In Continuous Flow Microcosms, Peter M. Eldridge
The Effect Of Nitrogen And Phosphorus Supply Ratios And Dilution Rate On Phosphorus Uptake And Mineralization In Continuous Flow Microcosms, Peter M. Eldridge
Dissertations, Theses, and Masters Projects
Continuous flow microcosms (50L volume, salinity 18-24 ppt) were used to examine the roles of heterotrophic protozoa and bacteria as phosphorus mineralizers. Nitrogen limitation was regulated by N:P supply ratios (5:1, 16:1) and growth rate was regulated by dilution rate (0.5, 0.25 volumes day&\sp{lcub}-1{rcub}&). Rates of carbon and phosphorus uptake from dissolved inorganic pools were determined using &\sp{14}&C and &\sp{lcub}32{rcub}&P tracer experiments and pre- and post-fractionation incubations. Based on uptake rates and on POP and POC values of the bacteria in the &<&1.0 &\mu&m fraction, mass balance estimates of bacterial mineralization were determined. An isotope dilution method was used to determine phosphorus mineralization in the unfractionated sample. Heterotrophic protozoan mineralization was calculated as the difference. Results showed that bacteria had a minor role as remineralizers of phosphorus, more often taking-up inorganic phosphorus than remineralizing it. Heterotrophic protozoa were the major remineralizers of phosphorus. Microcosm treatments with a greater supply of inorganic phosphorus over nitrogen had increased POP concentrations and increased phosphorus remineralization. The effect of dilution on phosphorus remineralization was temperature dependent. Greater remineralization occurred in the high dilution rate in the July through October experiments and less remineralization occurred in the high dilution rate treatments in the December and January experiments.
Determination Of Macrophage Chemiluminescent Response In Fundulus Heteroclitus As A Function Of Pollution And Temperature Stress, Karen Kelly Reay
Determination Of Macrophage Chemiluminescent Response In Fundulus Heteroclitus As A Function Of Pollution And Temperature Stress, Karen Kelly Reay
Dissertations, Theses, and Masters Projects
No abstract provided.
Growth Rate And Grazing Dynamics Of Coccoid Cyanobacteria In The Lower Chesapeake Bay, Carol J. Falkenhayn
Growth Rate And Grazing Dynamics Of Coccoid Cyanobacteria In The Lower Chesapeake Bay, Carol J. Falkenhayn
Dissertations, Theses, and Masters Projects
No abstract provided.
Frna Coliphages As A Viral Indicator Of Sewage Pollution In An Estuary, David Miller Boyd
Frna Coliphages As A Viral Indicator Of Sewage Pollution In An Estuary, David Miller Boyd
Dissertations, Theses, and Masters Projects
No abstract provided.
The Effects Of Shading By Open-Pile Structures On The Density Of Spartina Alterniflora, Heather L. Mcguire
The Effects Of Shading By Open-Pile Structures On The Density Of Spartina Alterniflora, Heather L. Mcguire
Dissertations, Theses, and Masters Projects
No abstract provided.