Life Sciences Commons^™

A Biological And Chemical Study Of The Tidal James River, Morris L. Brehmer, Samuel O. Haltiwanger

Reports

No abstract provided.

Final Report On Results Of Operation James River; An Evaluation Of The Physical And Biological Effects Of The Proposed James River Navigation Project, William J. Hargis Jr.

Reports

A comprehensive study of the physical and biological characteristics of the James Estuary has been carried out by oceanographers of the Virginia Institute of Marine Science under contract with the Virginia Commission of Fisheries. This research project, under way for three years, has been directed especially to the effects of the proposed James River Navigation Project channel dredging on physical features--i·~.,the structure and dynamics, of the estuary, and indirectly on oyster production. Five separate phases were carried out under the project (called Operation James River). These involved: 1) accumulation and study of relevant literature and data, 2) research into the …

Larval Development Of The Pelecypod Lyonsia Hyalina, P. Chanley, M. Castagna

VIMS Articles

Lyonsia hyalina (Conrad) is a small ( 1/2 to 3/4 inch) odd shaped clarn (Fig·. I) common along the Atlantic Coast from Nova Scotia to South Carolina (Abbott, 1954). It is usually found in sand in shallow water with a coating of small sand grains attached to the periostracurn. (...)

Aspects Of Biodeposition By Oysters And Other Invertebrate Filter Feeders, Dexter S. Haven, Reinaldo Morales-Alamo

VIMS Articles

Quantities of suspended matter removed by oysters (Crassostrea virginica) and deposited as feces or pseudofeces varied seasonally, reaching maxima in September. Below 2.8C, measurable quantities were not produced. At certain seasons, levels of suspended solids influenced quantities of biodeposits. Laboratory studies indicated that the oysters on 0.405 hectare of an estuarine bottom may produce up to 981 kg of feces and pseudofeces weekly. Of the particles, 95% were under 3 µ in diameter. all types of algal cells present in the surrounding water were represented. The deposits contained 77–91% inorganic matter, mostly illite, chlorite, and mixed‐layer clays, 4–12% …

Morphological And Cultural Studies Of A Motile Stage In The Life Cycle Of Dermocystidium Marinum., Frank O. Perkins, R. W. Menzel

VIMS Articles

Dermocystidium marinum hypnospores, obtained by exposure to thioglycollate (the Ray technique), were isolated from oyster tissue and placed in sea water under aerobic conditions. The cells differentiated into sporangia, and sporulation occurred by successive bipartition of the protoplast, resulting in the formation of motile cells within the hypnospore wall. The planonts escaped through one or two preformed discharge pores and tubes. All motile cells were biflagellated with both flagella attached laterally and subapically. The anterior flagellum had Flimmern and the posterior flagellum was a whiplash. The planont cell body was intermediate between reniform and pyriform. Sporulation morphology is discussed from …

Larval Development Of The Large Blood Clam, Noetia Ponderosa (Say), Paul E. Chanley

VIMS Articles

Larvae of Noelia ponderosa were raised from eggs in laboratory cultures. Lengths increased frorn 80 to 210μ, over a 4-week free- swimmining period. Height is 15 μ, less than length in small larvae but as much as 55 μ, less than length when larvae are ready to metamorphose. Depth varies front 25 to 70 μ. less than length over the same period. The straight-hinge line is 65 to 80 μ, long. The umbo is first for1ned at a length of . 150 to 160 μ. and beco1nes long and broad. Umboned larvae are brown with the shell becoming reddish-brown at …

Provisional List Of Parasites Occurring On Fundulus Spp, W. A. Dillon

VIMS Articles

In recent years interest in the utilization of fishes, particularly marine species, as experimental animals has increased. In the search for species amenable to this use, many investigators have chosen the hardy euryhaline species belonging to the genus Fundulus.

In the course of holding these animals under restricted laboratory conditions, problems involving parasitization have developed. In the summer of 1964, workers at our Institute experienced great difficulty in maintaining Fundulus in captivity, and large numbers of experimental animals died. Examination of these fish revealed them to be heavily infested with monogenetic trematodes (mostly gyrodactylids, a few dactylogyrids).

Inasmuch as severe …

Oyster Mortality Studies In Virginia .V. Epizootiology Of Msx A Protistan Pathogen Of Oysters, Jay D. Andrews

VIMS Articles

MSX, a pathogen of oysters (Crassostrea virginica), produced a drastic epizootic in high-salinity areas of Chesapeake Bay from 1959 to 1963. The patterns of infection and mortality were determined by imports from disease-free seed-oyster areas. Winter and spring imports became infected in early summer and began dying in late summer. Late-summer imports apparently became infected promptly but infections remained subclinical until the following May. Death rates were highest during warm months but losses occurred throughout the year. MSX was assigned as the cause of a high percentage of deaths by sampling live and dead oysters.

Mortality for the first and …

Parasitic Copepods Of Some Antarctic And New Zealand Fishes, David E. Zwerner

Dissertations, Theses, and Masters Projects

No abstract provided.

Descriptions Of Fecal Pellets Of Some Common Invertebrates In The Lower York River And Lower Chesapeake Bay, Virginia, John N. Kraeuter

Dissertations, Theses, and Masters Projects

No abstract provided.

Ecology Of Marine Invertebrate Fouling Organisms In Hampton Roads, Virginia, Dale R. Calder

Dissertations, Theses, and Masters Projects

Investigations were conducted from 15 May 1964 to 3 January 1966 to determine the incidence, distribution, and abundance of marine invertebrate fouling organisms in Hampton Roads, Virginia. Dredging carried out at seven stations revealed that benthic organisms most likely to be involved in fouling were Thuiaria argentea, Alcyonidium verrilli, Microciona prolifera, Amathia vidovici, and Aeverrillia armata. All of these species occur in the Pier 12 berthing area of the Norfolk Naval Base, with. !· argentea and~- verrilli being most abundant. Detailed studies of the organisms attaching to asbestos fiber test panels were made at Pier 12 of the Naval Base. …

Classification And Structures Of The Tidal Marshes Of The Poropotank River, Virginia, James Arthur Kerwin

Dissertations, Theses, and Masters Projects

No abstract provided.

The Metabolism Of Krebs Cycle Intermediates And Malonate By Eggs And Early Embryonic Stages Of Arbacia Punctulata, Russell Chancellor Addison

Dissertations, Theses, and Masters Projects

No abstract provided.

Skin Reactivity, Allergic Diagnosis And Personality, Richard Herbert Mccollum

Dissertations, Theses, and Masters Projects

No abstract provided.

Investigation Of Oyster Larvae And Spat And Certain Important Environmental Factors In An Horizontally Stratified Estuary : Final Report On Project 3-7-R, William J. Hargis Jr.

Reports

Reasonable progress has been made toward attaining the objectives of this project (No. 3-7-R). Considerable additional and new knowledge of the physical structure and dynamics of a theoretically horizontally-stratified estuary and the movement of the larvae and setting (spatfall) of juvenile Crassostrea virginica has been developed. Sedimentary processes, flushing times and the spatial and temporal distribution of the biological entities have also been investigated. Of especial interest have been the design, construction and verification of an hydraulic model of the system and the use of this scientific device to simulate movement of larvae by dye and to make 11time of …

Influence Of Environmental Factors On Color Change In The Lizard, Anolis Carolinensis, June Elizabeth Emerson

Dissertations, Theses, and Masters Projects

No abstract provided.

Larvae Of Bivalve Mollusks Of The Sevastopol Region Of The Black Sea, K. A. Zakhvatkina

Reports

No abstract provided.