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Full-Text Articles in Marine Biology
The Effects Of Salinity On The Growth And Survival Of The Crayfish, Procambarus Actus Actus (Girard), Emily Deaver
The Effects Of Salinity On The Growth And Survival Of The Crayfish, Procambarus Actus Actus (Girard), Emily Deaver
OES Theses and Dissertations
The white river crayfish, Procambarus acutus acutus was tested in low salinity water for growth and survival. Thirty animals were placed in each test pool at O, 4 and 8 ppt and grown for 75 days. Growth was defined as increase in carapace length and wet weight. Crayfish grew at a faster rate and had the lowest mortality at 4 ppt. Water hardness, defined as the total concentration of calcium and magnesium expressed as the calcium carbonate equivalent, ranged from 35 mg/1 to 195 mg/1. Pools of crayfish tested at concentrations of approximately 100 mg/1 total hardness exhibited the best …
The Effects Of Elevated Calcium Chloride And Magnesium Chloride Levels On Larval Growth And Survival Of Macrobrachium Rosenbergii (De Man) (Decapoda Palaemonidae) Reared In The Laboratory, James Thomas Michaels Ii
The Effects Of Elevated Calcium Chloride And Magnesium Chloride Levels On Larval Growth And Survival Of Macrobrachium Rosenbergii (De Man) (Decapoda Palaemonidae) Reared In The Laboratory, James Thomas Michaels Ii
OES Theses and Dissertations
The effects of elevated CaCl2 , MgCl2 , combination CaCl2 and MgCl2 concentrations and their associated ionic strengths on larval growth and survival of the freshwater prawn, Macrobrachium rosenbergii were investigated in the laboratory. Larvae were reared in diluted seawater of 15 parts per thousand salinity with elevated calcium concentrations of 330 parts per million and elevated magnesium concentrations of 1275 parts per million. Control larvae were also reared with elevated NaCl concentrations to duplicate the ionic strength increases of the combination CaCl2 - MgCl2 test solution which had the highest ionic strength. A …
Filtration Ingestion And Assimilation Rates Of The Mysid Shrimp Neomysis Americana Smith, Fed Three Food Sources, Robert W. Grabb
Filtration Ingestion And Assimilation Rates Of The Mysid Shrimp Neomysis Americana Smith, Fed Three Food Sources, Robert W. Grabb
OES Theses and Dissertations
Laboratory grazing and assimilation experiments were conducted on the mysid shrimp Neomysis americana in an attempt to assess the suitability of three potential food sources. It was hypothesized that the smaller size classes were primarily herbivores, not becoming omnivorous until attaining lengths of approximately 5-6 mm. Four size classes of mysids from the summer generation, juveniles, immature, adult males, and adult ovigerous females were each fed three concentrations of Artemia salina nauplii, the rotifer Brachionus plicatilis, and the diatom Coscinodiscus lineatus. The mean lengths of the size classes utilized, plus or minus one standard deviation, were 2.5 …
Distribution Of The Dinoflagellate Symbiosis In Astragia Danae As Affected By Light Attenuation, Michael Perry Weston
Distribution Of The Dinoflagellate Symbiosis In Astragia Danae As Affected By Light Attenuation, Michael Perry Weston
OES Theses and Dissertations
Spatial zonation of symbiotic and aposymbiotic forms of the temperate coral Astrangia danae provides evidence that light attenuation is an important factor in the distribution of this animal. At four locations in the lower Chesapeake Bay and adjacent offshore waters, symbiotic colonies were observed only in well illuminated surface waters, while aposymbiotic colonies were observed in less illuminated deeper waters. A transition zone exists in which both colony types are found. Colonies on substrates forming a plane parallel to the sea-surface receive a greater radiant flux than colonies on vertical substrates. This extends the depth range of symbiotic colonies located …
Behavioral Responses Of Decapod Larvae To Light, Salinity And Chlorine, Jerome E. Illowsky
Behavioral Responses Of Decapod Larvae To Light, Salinity And Chlorine, Jerome E. Illowsky
Dissertations, Theses, and Masters Projects
No abstract provided.
Pelagic Amphipods (Amphipoda: Hyperiidea) Of The Continental Shelf In The Middle Atlantic Bight, Russell Allen Short
Pelagic Amphipods (Amphipoda: Hyperiidea) Of The Continental Shelf In The Middle Atlantic Bight, Russell Allen Short
Dissertations, Theses, and Masters Projects
No abstract provided.
The Osmotic Fragility Of Red Blood Cells Of Marine Animals: A Comparative Study, Robert Demanche
The Osmotic Fragility Of Red Blood Cells Of Marine Animals: A Comparative Study, Robert Demanche
Dissertations, Theses, and Masters Projects
No abstract provided.
Resource Use By Amphipoda (Crustacea: Peracarida) On The Outer Continental Shelf Of The Middle Atlantic Bight: Implications To Community Structure, Linda C. Schaffner
Resource Use By Amphipoda (Crustacea: Peracarida) On The Outer Continental Shelf Of The Middle Atlantic Bight: Implications To Community Structure, Linda C. Schaffner
Dissertations, Theses, and Masters Projects
Benthic communities on the outer continental shelf of the Middle Atlantic Bight are characterized by abundant populations of amphipods in the families Ampeliscidae and Corophiidae. Members of these families occupy tubes at or near the sediment surface and, thus, potentially compete with each other for spatial and trophic resources. This study examines the spatial, temporal and trophic resource use of six numerically dominant species in these families as a means of assessing the relative importance of competition as a structuring force in outer shelf benthic communities.
Analysis of abundance data and the use of discriminant analysis to relate abundance to …
An Analysis Of Parasite Communities Of The Atlantic Croaker, Micropogonias Undulatus (Linnaeus), Within The Chesapeake Bay, David A. Benner
An Analysis Of Parasite Communities Of The Atlantic Croaker, Micropogonias Undulatus (Linnaeus), Within The Chesapeake Bay, David A. Benner
Dissertations, Theses, and Masters Projects
No abstract provided.
Aspects Of Vertical Distribution And Ecology Of The Dominant Meso- And Bathypelagic Fishes From The Norfolk Canyon Region, John V. Gartner
Aspects Of Vertical Distribution And Ecology Of The Dominant Meso- And Bathypelagic Fishes From The Norfolk Canyon Region, John V. Gartner
Dissertations, Theses, and Masters Projects
No abstract provided.
Bioaccumulation And Effects Of Kepone On Spot, Leiostomus Xanthurus, Linda L. Stehlik
Bioaccumulation And Effects Of Kepone On Spot, Leiostomus Xanthurus, Linda L. Stehlik
Dissertations, Theses, and Masters Projects
No abstract provided.
Coral-Nutrient Relationships, Lawrence J. Pastor
Coral-Nutrient Relationships, Lawrence J. Pastor
Dissertations, Theses, and Masters Projects
No abstract provided.
Morphological, Histological, And Physiological Aspects Of Assimilation In Larval Spot, Leiostomus Xanthurus Lacepede, John Jeffrey Govoni
Morphological, Histological, And Physiological Aspects Of Assimilation In Larval Spot, Leiostomus Xanthurus Lacepede, John Jeffrey Govoni
Dissertations, Theses, and Masters Projects
In view of questions concerning the digestive and assimilative abilities of larval marine fishes, the changes in these processes with development, and their relationship with starvation-induced mortality; this study has three objectives: (1) to examine the morphological and histological development of the alimentary canal and associated structures of larval spot, Leiostomus xanthurus (Pisces: Sciaenidae); (2) to assess short-term carbon assimilation in discrete age cohorts of larval spot; and (3) to relate any changes in assimilation to development. The alimentary canal and associated structures of larval spot from hatching through transformation (metamorphosis) were examined using light microscopy. These findings were related …
The Effects Of Chlorinated Sea Water On The Blue Crab, Callinectes Sapidus, Chae E. Laird
The Effects Of Chlorinated Sea Water On The Blue Crab, Callinectes Sapidus, Chae E. Laird
Dissertations, Theses, and Masters Projects
The effects of chlorinated sea water on the blue crab, Callinectes sapidus Rathbun, were evaluated through measurements of acute toxicity, serum constituents (protein, total ninhydrin positive substances, chloride, osmotic, sodium, potassium, calcium, and magnesium concentrations), oxygen consumption and ventilation rates in whole crabs, and oxygen consumption of excised gills. Histological examination of gills was also performed. The 96-hr LC50 for female blue crabs exposed to chlorinated sea water at 21�C and 14('0)/00 was 0.86 mgCl(,2)/l CIO (chlorine induced oxidants). The value for males under similar conditions was 0.84 mgCl(,2)/l CIO. Mortality was uncommon below 0.61 mgCl(,2)/l, but reached 100% with …
Food Habits, Prey Selectivity And Food Resource Partitioning Of A Community Of Fishes On The Outer Continental Shelf, George R. Sedberry Iii
Food Habits, Prey Selectivity And Food Resource Partitioning Of A Community Of Fishes On The Outer Continental Shelf, George R. Sedberry Iii
Dissertations, Theses, and Masters Projects
The demersal fish community of the outer continental shelf in the Middle Atlantic Bight consists of resident species, seasonal species with boreal affinities, and seasonal species with warm temperature affinities. Dominant demersal fishes of the outer continental shelf feed primarily on macrobenthic invertebrates, which persist in dense, stable communities. Some dominant predators also feed heavily on fishes, cephalopods, and planktonic invertebrates, at least seasonally. Food habits of the fishes change seasonally, especially at the species level. Food habits of fishes also change considerably with size, with most predators showing distinct feeding stanzas separated by a marked change in feeding strategy. …