Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 7 of 7
Full-Text Articles in Life Sciences
Epizootiology Of The Parasitic Dinoflagellate Hematodinium Sp In The American Blue Crab Callinectes Sapidus, Ga Messick, Jeffrey D. Shields
Epizootiology Of The Parasitic Dinoflagellate Hematodinium Sp In The American Blue Crab Callinectes Sapidus, Ga Messick, Jeffrey D. Shields
VIMS Articles
Hematodinium sp. is a parasitic dinoflagellate that infects and kills blue crabs Callinectes sapidus. Periodic outbreaks of dinoflagellate infections with subsequent high host mortalities prompted a study of the epizootiology and distribution of the crab pathogen. Hemolymph samples from over 13 000 crabs were assessed for infections over 8 yr. Moderate to high prevalences were found at several locations along the Atlantic and Gulf coasts of the United States. In the coastal bays of Maryland and Virginia, prevalence followed a seasonal pattern, with a sharp peak in late autumn. Infections were significantly more prevalent in crabs measuring less than 30 …
Haplosporidiosis In The Pacific Oyster Crassostrea Gigas From The French Atlantic Coast, R Renault, Na Stokes, Et Al, Em Burreson
Haplosporidiosis In The Pacific Oyster Crassostrea Gigas From The French Atlantic Coast, R Renault, Na Stokes, Et Al, Em Burreson
VIMS Articles
Two cases of haplosporidian infection occurred during 1993 in Pacific oysters Crassostrea gigas from the French Atlantic coast. The localization and ultrastructure of the plasmodia are described. In situ hybridization of infected tissue sections was conducted with DNA probes for oyster-infecting haplosporidians. The Haplosporidium nelsoni-specific DNA probe MSX1347 hybridized with the C. gigas parasite, and the H, costale-specific probe SSO1318 did not hybridize. Total genomic DNA was extracted from the infected tissue sections for polymerase chain reaction (PCR) amplification of the haplosporidian. PCR amplifications with H. nelsoni-specific primers and with 'universal' actin primers did not yield the expected products of …
Zoosporulation Of A New Perkinsus Species Isolated From The Gills Of The Softshell Clam Mya Arenaria, Sm Mclaughlin, Bd Tall, A Shaheen, Ee Elsayed, M Faisal
Zoosporulation Of A New Perkinsus Species Isolated From The Gills Of The Softshell Clam Mya Arenaria, Sm Mclaughlin, Bd Tall, A Shaheen, Ee Elsayed, M Faisal
VIMS Articles
A gill-associated Perkinsus sp. isolated from the softshell clam (Myo arenaria) is described as a new species, P. chesapeaki sp. nov. Examination of the parasite in seawater cultures revealed life cycle stages and zoosporulation processes similar to those described for other species of the genus Perkinsus. Prezoosporangia developed thickened cell walls upon contraction of the cytoplasm and development of a distinctive clear area between the cell wall and the protoplast. Successive bipartition of the protoplast led to the formation of hundred's of zoospores within mature sporangia. Zoospores were released into seawater through one or more discharge tubes, Ultrastructural studies revealed …
Joint Effects Of Larval Dispersal, Population Regulation, Marine Reserve Design, And Exploitation On Production And Recruitment In The Caribbean Spiny Lobster, Wt Stockhausen, Rom Lipcius, Bm Hickey
Joint Effects Of Larval Dispersal, Population Regulation, Marine Reserve Design, And Exploitation On Production And Recruitment In The Caribbean Spiny Lobster, Wt Stockhausen, Rom Lipcius, Bm Hickey
VIMS Articles
A spatially explicit population-dynamics model for the Caribbean spiny lobster (Panulirus argus) in Exuma Sound Bahamas, was used to investigate the joint effects of marine reserve design and larval dispersal via hydrodynamic currents on an exploited benthic invertebrate. The effects of three hydrodynamic scenarios tone diffusion-only and two advection-diffusion cases), one exploitation level, and 28 reserve configurations (7 sizes x 4 locations) on catch and larval production were simulated. The diffusion-only scenario represented the condition in which settlement did not vary substantially over broad spatial scales; in contrast, the advection-diffusion scenarios represented realistic hydrodynamic patterns and :introduced broad spatial variation. …
Reconstruction Of Ancestral Character States In Neocoleoid Cephalopods Based On Parsimony, Michael Vecchione, Richard E. Young, David B. Carlini
Reconstruction Of Ancestral Character States In Neocoleoid Cephalopods Based On Parsimony, Michael Vecchione, Richard E. Young, David B. Carlini
VIMS Articles
The Neocoleoidea. sister group to the Bele1nnoidea, includes all li ving cephalopod species except naut.ilids. as well as their imn1ediare ancestors. Several hypotheses have been published about the n1orphology of ancestral neocoleoids. Ancestral states are easily inferred from foss ils for son1e characters, such as 10 anns and the presence of an ink sac in basal coleoids or the presence of fins in ancient octopods. Many inferences are less strongly supported, though. and open to debate. We examine this problen1 using three cladograrns resulting from analyses of morphology and DNA sequences (both rnitochondrial and nuclear) f ron1 san1ples representing the …
Feeding Habits Of Young-Of-Year Striped Bass Morone Saxatilis, And White Perch, Morone American In Lower James River, Va, Paul J. Rudershausen, Joseph G. Loesch
Feeding Habits Of Young-Of-Year Striped Bass Morone Saxatilis, And White Perch, Morone American In Lower James River, Va, Paul J. Rudershausen, Joseph G. Loesch
VIMS Articles
A total of 188 young-of-year (YOY) striped bass, Marone saxatilis, and 199 YOY white perch, Marone americana, were collected by pushnet, seine and trawl during 24-hour periods from June through August, 1992 in lower James River, Virginia. The purpose was to identify prey and temporal and spatial feeding habits. Copepods were the most numerous prey of both species. Fishes and mysids comprised the largest volumetnc percentage of diets of striped bass and white perch, respectively. Using an index of relative importance, leptodorids and copepods were the most important prey of striped bass and white perch, respectively. Botl1 species shifted from …
Estimates Of Naked Goby (Gobiosoma Bosc), Striped Blenny (Chasmodes Bosquianus) And Eastern Oyster (Crassostrea Virginica) Larval Production Around A Restored Chesapeake Bay Oyster Reef, Jm Harding, Roger L. Mann
Estimates Of Naked Goby (Gobiosoma Bosc), Striped Blenny (Chasmodes Bosquianus) And Eastern Oyster (Crassostrea Virginica) Larval Production Around A Restored Chesapeake Bay Oyster Reef, Jm Harding, Roger L. Mann
VIMS Articles
Naked gobies (Gobiosoma bose) and striped blennies (Chasmodes bosquianus) rely on oyster reefs for nesting sites, feeding grounds, and refugia from predation by upper level piscivores. Seasonal densities of Eastern oysters (Crassostrea virginica), naked gobies, and striped blennies on Palace Bar Reef, Piankatank River, Virginia were quantified and used to develop species-specific larval production estimates. Densities of oyster adults, juveniles, and articulated shell valves (the result of recent mortality) did not significantly change from November 1995 to November 1996. Naked goby and striped blenny densities varied with substrate type and season; peak fish densities for both species were observed in …