scholarly journals Grazing on a natural assemblage of ciliate and dinoflagellate cysts by the eastern oyster Crassostrea virginica

2009 ◽  
Vol 6 ◽  
pp. 227-233 ◽  
Author(s):  
A Persson ◽  
BC Smith
Keyword(s):  
Crassostrea Virginica ◽  
Eastern Oyster ◽  
Dinoflagellate Cysts ◽  
Natural Assemblage

Effects of resuspension of eastern oyster Crassostrea virginica biodeposits on phytoplankton community structure

2020 ◽  
Vol 640 ◽  
pp. 79-105
Author(s):  
ET Porter ◽  
E Robins ◽  
S Davis ◽  
R Lacouture ◽  
JC Cornwell
Keyword(s):  
Water Quality ◽  
Community Structure ◽  
Crassostrea Virginica ◽  
Skeletonema Costatum ◽  
Eastern Oyster ◽  
Energy Dissipation Rate ◽  
Negative Effects ◽  
Cell Densities ◽  
Sediment Bottom ◽  
Nitrite Nitrate

Anthropogenic disturbances in the Chesapeake Bay (USA) have depleted eastern oyster Crassostrea virginica abundance and altered the estuary’s environment and water quality. Efforts to rehabilitate oyster populations are underway; however, the effect of oyster biodeposits on water quality and plankton community structure are not clear. In July 2017, we used 6 shear turbulence resuspension mesocosms (STURMs) to determine differences in plankton composition with and without the daily addition of oyster biodeposits to a muddy sediment bottom. STURM systems had a volume-weighted root mean square turbulent velocity of 1.08 cm s-1, energy dissipation rate of ~0.08 cm2 s-3, and bottom shear stress of ~0.36-0.51 Pa during mixing-on periods during 4 wk of tidal resuspension. Phytoplankton increased their chlorophyll a content in their cells in response to low light in tanks with biodeposits. The diatom Skeletonema costatum bloomed and had significantly longer chains in tanks without biodeposits. These tanks also had significantly lower concentrations of total suspended solids, zooplankton carbon, and nitrite +nitrate, and higher phytoplankton carbon concentrations. Results suggest that the absence of biodeposit resuspension initiates nitrogen uptake for diatom reproduction, increasing the cell densities of S. costatum. The low abundance of the zooplankton population in non-biodeposit tanks suggests an inability of zooplankton to graze on S. costatum and negative effects of S. costatum on zooplankton. A high abundance of the copepod Acartia tonsa in biodeposit tanks may have reduced S. costatum chain length. Oyster biodeposit addition and resuspension efficiently transferred phytoplankton carbon to zooplankton carbon, thus supporting the food web in the estuary.

Transcriptomic signatures of temperature adaptation in the eastern oyster Crassostrea virginica

2021 ◽  
Author(s):  
Kevin M. Johnson ◽  
Hollis R. Jones ◽  
Sandra M. Casas ◽  
Jerome F. La Peyre ◽  
Morgan W. Kelly
Keyword(s):  
Crassostrea Virginica ◽  
Eastern Oyster ◽  
Temperature Adaptation

scholarly journals Heritability of acute low salinity survival in the Eastern oyster (Crassostrea virginica)

Aquaculture ◽  
2020 ◽  
Vol 529 ◽  
pp. 735649
Author(s):  
Alexandra J. McCarty ◽  
K. McFarland ◽  
J. Small ◽  
S.K. Allen ◽  
L.V. Plough
Keyword(s):  
Crassostrea Virginica ◽  
Eastern Oyster ◽  
Low Salinity

scholarly journals Population Studies of the Native Eastern Oyster,Crassostrea virginica, (Gmelin, 1791) in the James River, Virginia, USA

2009 ◽  
Vol 28 (2) ◽  
pp. 193-220 ◽  
Author(s):  
Roger Mann ◽  
Melissa Southworth ◽  
Juliana M. Harding ◽  
James A. Wesson
Keyword(s):  
Crassostrea Virginica ◽  
Population Studies ◽  
Eastern Oyster ◽  
James River
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