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Full-Text Articles in Life Sciences
Mercury, Copper, And Zinc In Selected Ichthyofauna Of Lower Chesapeake Bay And Hampton Roads, Virginia, W. Bruce Aitenhead
Mercury, Copper, And Zinc In Selected Ichthyofauna Of Lower Chesapeake Bay And Hampton Roads, Virginia, W. Bruce Aitenhead
OES Theses and Dissertations
Anchovys, croaker, spat, summer flounder and hogchokers were collected monthly to seasonally from November 1972 to October 1973 at three locations in the southern Chesapeake Bay region of Virginia.
The concentrations of mercury, copper and zinc were determined by atomic absorption spectrophotometry in whole fishes. Metal concentration varied with species and location. Anchovys had the highest mean concentrations of mercury and zinc while hog- chokers had the highest mean copper concentration. Mercury levels exceeding O.5 ppm were observed in species from all three loca- tions, but maximum heavy metal concentrations per species were highest in Craney Island fishes.
Temporal variations …
Life History Aspects Of The Gray Tilefish, Caulolatilus Microps (Goode And Bean, 1878), Jeffrey L. Ross
Life History Aspects Of The Gray Tilefish, Caulolatilus Microps (Goode And Bean, 1878), Jeffrey L. Ross
Dissertations, Theses, and Masters Projects
No abstract provided.
The Structure Of Macrofaunal Assemblages Inhabiting An Intertidal Sandflat In Tomales Bay, California, Jay Charles Carroll
The Structure Of Macrofaunal Assemblages Inhabiting An Intertidal Sandflat In Tomales Bay, California, Jay Charles Carroll
University of the Pacific Theses and Dissertations
Confronted with a diverse sandflat community of interacting organisms and a spectrum of physical forces, a meaningful community analysis should begin with a description of physical characteristics and faunal distributions over time. The functional importance of certain species in the community should then be investigated by using both field and laboratory experiments. Consequently, the purpose of this research was twofold: (1) to apply the methods of similarity and gradient analysis to describe the faunal gradation on an intertidal sandflat and; (2) use these data to design a predator exclusion field experiment aimed at assessing the effects of shorebird, crab and …
Experimental Studies Of Interactions Between Zostera Marina And The Associated Benthic Fauna, David Marshall Penny
Experimental Studies Of Interactions Between Zostera Marina And The Associated Benthic Fauna, David Marshall Penny
University of the Pacific Theses and Dissertations
The objectives of the present study are to: (1) Describe the macro-invertebrate species composition and seasonal changes in abundance of the benthic infauna within an eelgrass bed; (2) Observe what immediate effects occur to the benthic community as a result of experimental removal of eelgrass plants from plants within the Zostera bed; (3) Measure the seasonal variation of eelgrass turion length over an annual cycle and determine its correlation to biomass (dry weight); (4) Examine, by means of field experiments, the importance of incident solar irradiation in affecting the seasonal growth of Zostera; and (5) Determine the relationship, if any, …
Planktonic Fish Eggs And Larvae Of The Lower Chesapeake Bay, John E. Olney
Planktonic Fish Eggs And Larvae Of The Lower Chesapeake Bay, John E. Olney
Dissertations, Theses, and Masters Projects
No abstract provided.
The Effects Of Predation And Sediment Reworking By The Maldanid Polychaete Axiothella Rubrocincta (Johnson) On Benthic Littoral Microalgae Assemblages, Gary Scott Shusta
The Effects Of Predation And Sediment Reworking By The Maldanid Polychaete Axiothella Rubrocincta (Johnson) On Benthic Littoral Microalgae Assemblages, Gary Scott Shusta
University of the Pacific Theses and Dissertations
The taxonomic composition of the diatom assemblages inhabiting the substrate on the mudflat, and the effects of a cohabiting deposit-feeding invertebrate on the diatom assemblage structure are the subjects of this paper. While pelagic diatoms have received considerable attention in the literature to date, comparatively little is known about the ecology and distribution of benthic diatoms are known to be cosmopolitan in their distributions (Alee, 1950). These plants have been found to be opportunistic species in that they are quick to respond to relatively small perturbations in physical conditions. It has also been demonstrated that distinct associations of diatoms exist …
Zooplankton Distribution, Biomass, Biochemical Composition And Seasonal Community Structure In Lower Chesapeake Bay, Fred Jacobs
Zooplankton Distribution, Biomass, Biochemical Composition And Seasonal Community Structure In Lower Chesapeake Bay, Fred Jacobs
Dissertations, Theses, and Masters Projects
Zooplankton composition, distribution, biomass and biochemical constituents were determined monthly in the lower Chesapeake Bay for two years beginning in August 1971. Settled volume, dry weight, and ash-free dry weight estimates of total biomass were generally consistent in showing summer and late winter peaks. A mean dry weight peak of 258 mg/m3 in August 1971 decreased precipitously to a December low of 9 mg/m3, then increased to a March 1972 peak of 199 mg/m3. The second year mirrored this pattern, except that the passage of Tropical Storm Agnes in June 1972 lowered the summer peak values for July and August …
The Ultrastructure Of Cell Division In Male Reproductive Branches Of Polysiphonia Denudata, Cynthia Louise Bosco
The Ultrastructure Of Cell Division In Male Reproductive Branches Of Polysiphonia Denudata, Cynthia Louise Bosco
Dissertations, Theses, and Masters Projects
No abstract provided.
The Reproductive Biology And Population Dynamics Of Black Sea Bass, Centropristis Striata, Linda P. Mercer
The Reproductive Biology And Population Dynamics Of Black Sea Bass, Centropristis Striata, Linda P. Mercer
Dissertations, Theses, and Masters Projects
No abstract provided.