Life Sciences Commons^™

Strobilation Of The Sea Nettle, Chrysaora Quinquecirrha, Under Field Conditions, Dale R. Calder

VIMS Articles

The sea nettle, Chrysaora quinquecirrlza (Desor, 1848) , is locally abundant during summer along the east coast of the United States from southern New England to Florida. The venomous medusa stage of this species is a significant pest and a negative economic factor, particularly in the Chesapeake Bay region.

In common with many other cnidarians, C. quinquecirrha undergoes an alternation between polyp and medusa stages in its life history. While the medusa population dies off annually, the sessile polyp or scyphistoma stage may remain active all year and is potentially perennial (Truitt, 1939). The scyphistoma is capable of asexual reproduction, …

Isolation Of Bacteriophages Of The Marine Bacterium Beneckea Natriegens From Coastal Salt Marshes, Arthur Zachary

VIMS Articles

Bacteriophages of the marine bacterium Beneckea natriegens were isolated from coastal marshes where they were limited to brackish and marine waters. The phages were widely distributed and morphologically diverse in the marshes.

Larval Development Of Pagurus Longicarpus Say Reared In The Laboratory. V. Effect Of Diet On Survival And Molting, Morris H. Roberts

VIMS Articles

During the last several decades, papers too numerous to list here have been published describing larval stages of decapod crustaceans reared in the laboratory. Through this work techniques for rearing these larvae have become standardized, making a variety of physiological amid ecological experiments possible (for example, Costlow, 1961, 1964, 1966, 1967 ; Costlow and Bookhout, 1968 ; Roberts, 1971a, 1971b). Yet relatively little is known about the nutritional requirements of decapod larvae. Lebour ( 1922) performed a limited number of stomach content analyses on planktonic zoeae and reported that decapod larvae are principally phytophagous. Subsequent laboratory study led her to …

The Utilization Of Dissolved Free Amino Acids By Estuarine Microorganisms, C. C. Crawford, J. E. Hobbie, K. L. Webb

VIMS Articles

The importance of bacteria in the cycling of carbon in the Pamlico River estuary was studied by measuring the rates of uptake of organic compounds. Our methods allowed analysis with the Michaelis-Menten kinetics equations, and both the rates of uptake of dissolved free amino acids (DFAA) and glucose as well as the percentage of carbon subsequently respired as CO2 were determined. In addition, the concentrations of the amino acids in the water were determined using ion exchange chromatography. Other tests included measurements of primary productivity and of the effects of the other amino acids in the water upon the uptake …

Combined Effects Of Changes In Temperature And Salinity On Early Stages Of Rangia Cuneata, Thomas D. Cain

VIMS Articles

Embryos and early straight-hinge larvae of Rangia cuneata were subjected to a temperature change of 8°C in 5 seconds, a salinity change of 4%o (5 to 1%0), and to the combination of both stresses. Embryos were relatively insensitive to the thermal shock but were killed by the salinity shock and by the combined salinity...,...temperature shock. Survival and growth of larvae were reduced by the salinity shock and by the combination of temperature and salinity shocks. The combination of the thermal shock and salinity change produced a mortality higher than the sum of the mortalities for either of the two factors …

Effect Of An Oil Spill On Benthic Animals In The Lower York River, Virginia, M E. Bender, J. L. Hyland, T. K. Duncan

VIMS Articles

Although considerable study has been centered upon intertidal organisms with respect to their response to oil spills, most investigations have been conducted on exposed rocky intertidal habitats (1). Few studies are available which describe the response of benthic animal communities in mid-Atlantic estuaries and particularly in its largest estuary, Chesapeake Bay. This study documents both from field survey data and laboratory bioassay studies the effects of an accidental oil spill on the intertidal benthic communities of the Lower York River, Virginia .