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Full-Text Articles in Life Sciences
Survival Of Escherichia-Coli And Salmonella Spp In Estuarine Environments, Mw Rhodes, Hi Kator
Survival Of Escherichia-Coli And Salmonella Spp In Estuarine Environments, Mw Rhodes, Hi Kator
VIMS Articles
Survival of Escherichia coli and Salmonella spp. in estuarine waters was compared over a variety of seasonal temperatures during in situ exposure in diffusion chambers. Sublethal stress was measured by both selective-versus-resuscitative enumeration procedures and an electrochemical detection method. E. coli and Salmonella spp. test suspensions, prepared to minimize sublethal injury, were exposed in a shallow tidal creek and at a site 7.1 km further downriver. Bacterial die-off and sublethal stress in filtered estuarine water were inversely related to water temperature. Salmonella spp. populations exhibited significantly less die-off and stress than did E. coli at water temperatures of <10°C. Although the most pronounced reductions (ca. 3 log units) in test bacteria occurred during seasonally warm temperatures in the presence of the autochthonous microbiota, 102 to 104 test cells per ml remained after 2 weeks of exposure to temperatures of >15°C. Reductions …
Discocilia And Paddle Cilia In The Larvae Of Mulinia Lateralis And Spisula Solidissima (Mollusca: Bivalvia), Bernardita Campos, Roger L. Mann
Discocilia And Paddle Cilia In The Larvae Of Mulinia Lateralis And Spisula Solidissima (Mollusca: Bivalvia), Bernardita Campos, Roger L. Mann
VIMS Articles
The bivalve larval velum contains four bands of cilia: inner and outer preoral bands, an adoral band, and a postoral band. The preoral bands of compound cilia are generally considered to be used for both locomotion and food gathering. The adoral and postoral bands function in concert with the preoral bands in food gathering and transfer of food to the mouth. Cilia are usually described as cylindrical structures which taper to a blunt tip. Modified cilia with disc-shaped (discocilia) or pad dle-shaped ends have been recorded in several invertebrate species. Here, for the first time, we demonstrate the presence of …
Fishery And Culture Of Selected Bivalves In Mexico: Past, Present And Future, Erik Baqueiro, Michael Castagna
Fishery And Culture Of Selected Bivalves In Mexico: Past, Present And Future, Erik Baqueiro, Michael Castagna
VIMS Articles
This paper reviews the culture of selected bivalves of Mexico. Most species are utilized locally, but there is potential for some exports. The culture and fisheries of bivalves are often hampered by lack of information and restrictive regulations. Pinctada mazatlanica was grown for pearls and pearl shell production in the early 1900s. The methods used for its culture are reviewed. The culture of a few commercial species has shown encouraging results. Over 10,000 kilometers of coastal area with more than 1.5 million hectares of coastal lagoons and bays, plus a subtropical climate, give Mexico a great potential for the development …
Distribution Of Bivalve Larvae At A Frontal System In The James River, Virginia, Roger L. Mann
Distribution Of Bivalve Larvae At A Frontal System In The James River, Virginia, Roger L. Mann
VIMS Articles
James River is the southernmost of the major subestuaries of the Chesapeake Bay, USA. A frontal system develops on the early flood tide in the Hampton Roads region of the lower James. This system, together with a cyclonic gyre in Hampton Roads, is in part responsible for partial retention of downstream-flowing water in the estuary and it's injection into deeper, upstream-flowing water. The role of the frontal system in retention of bivalve larvae in the James was investigated In a 2-part study: a field exammation of larval distr~bution versus depth along a transect across the front in relation to salinity …
Rehabilitation Of The Troubled Oyster Industry Of The Lower Chesapeake Bay, William J. Hargis Jr., Dexter S. Haven
Rehabilitation Of The Troubled Oyster Industry Of The Lower Chesapeake Bay, William J. Hargis Jr., Dexter S. Haven
VIMS Articles
After 1885 Virginia's lower Chesapeake Bay system produced more oysters per year than any other area in the United States and remained predominant until 1960. Since then she has surrendered supremacy as annual harvests of her troubled oyster industry have steadily declined. Numerous factors were responsible for the tremendous productivity of the lower Bay's oyster beds; a number have been involved in its decline. Natural events, such as the catastrophic epizootics of the early 1960's, continuing disease and predation, increased salinities of drought years and great freshets of tropical storms have contributed significantly to the reduction. Pollution and other man-related …
Nearshore Ichthyoplankton Associated With Seagrass Beds In The Lower Chesapeake Bay, Je Olney, Gw Boehlert
Nearshore Ichthyoplankton Associated With Seagrass Beds In The Lower Chesapeake Bay, Je Olney, Gw Boehlert
VIMS Articles
Estuaries serve as important nursery habitats for larvae and juveniles of many species of fishes and invertebrates. Within the estuary, however, partitioning may occur among main channel. mud flat, tidal creek, and vegetated habitats. In this study we describe the egg, larval, and juvenile fish assemblages in shallow areas of submerged aquatic vegetation (SAV) of the lower Chesapeake Bay and compare them with those over the adjacent, shallow sand habitat. Densities at night over all habitats were about 1 order of magnitude higher than daytime densities, and were highest in summer. The SAV habitats were not important spawning sites for …
Synchronous Emergence And Mass Migration In Juvenile Queen Conch, Aw Stoner, Rom Lipcius, Ls Marshall, At Bardales
Synchronous Emergence And Mass Migration In Juvenile Queen Conch, Aw Stoner, Rom Lipcius, Ls Marshall, At Bardales
VIMS Articles
No abstract provided.
Pipefish Foraging: Effects Of Fish Size, Prey Size And Altered Habitat Complexity, Ch Ryer
Pipefish Foraging: Effects Of Fish Size, Prey Size And Altered Habitat Complexity, Ch Ryer
VIMS Articles
Laboratory experiments determined the effects of 2 levels of habitat complexity upon pipefish Syngnathus fuscus foraging for amphipods. Habitats were composed of equal densities of either narrow (low complexity) or wide (high complexity) leafed artificial seagrass. Response to habitat - as measured by rate of encounter with amphipods, probability of attack after encounter, probability of success after attack, and overall rate of amphipod consumption - was determined for combinations of 2 fish size classes and 3 amphipod size classes. Small fish did not respond to changes in habitat complexity, while large fish did. Large fish encountered fewer amphipods in the …
Subsurface Chlorophyll Maximum In August-September 1985 In The Climax Area Of The North Pacific, Rw Eppley, E Swift, Dg Redalje, Mr Landry, Lw Haas
Subsurface Chlorophyll Maximum In August-September 1985 In The Climax Area Of The North Pacific, Rw Eppley, E Swift, Dg Redalje, Mr Landry, Lw Haas
VIMS Articles
No abstract provided.