scholarly journals Species-specific patterns of distribution and abundance of the cryptic copepods Pseudocalanus moultoni and P. newmani on Georges Bank (NW Atlantic Ocean) during spring 1995–2012

2020 ◽  
Vol 208 ◽  
pp. 104242
Author(s):  
Kayla E. Crouch ◽  
Leocadio Blanco-Bercial ◽  
David E. Richardson ◽  
Nancy J. Copley ◽  
Peter H. Wiebe ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Georges Bank ◽  
Patterns Of Distribution ◽  
Species Specific

Compressional velocities from multichannel refraction arrivals on Georges Bank—northwest Atlantic Ocean

Geophysics ◽  
1979 ◽  
Vol 44 (6) ◽  
pp. 1022-1033 ◽  
Author(s):  
L. D. McGinnis ◽  
R. M. Otis
Keyword(s):  
Atlantic Ocean ◽  
Velocity Distribution ◽  
Vertical Velocity ◽  
Georges Bank ◽  
Overburden Pressure ◽  
Northwest Atlantic ◽  
The North ◽  
Continuous Coverage ◽  
Velocity Gradients ◽  
North Edge

Velocities were obtained from unreversed, refracted arrivals on analog records from a 48‐channel, 3.6-km hydrophone cable (3.89 km from the airgun array to the last hydrophone array). Approximately 200 records were analyzed along 1500 km of ship track on Georges Bank, northwest Atlantic Ocean, to obtain regional sediment velocity distribution to a depth of 1.4 km below sea level. This technique provides nearly continuous coverage of refraction velocities and vertical velocity gradients. Because of the length of the hydrophone cable and the vertical velocity gradients, the technique is applicable only to the Continental Shelf and the shallower parts of the Continental Slope in water depths less than 300 m. Sediment diagenesis, the influence of overburden pressure on compaction, lithology, density, and porosity are inferred from these data. Velocities of the sediment near the water‐sediment interface range from less than 1500 m/sec on the north edge of Georges Bank to 1830 m/sec for glacial deposits in the northcentral part of the bank. Velocity gradients in the upper 400 m range from [Formula: see text] on the south edge of the bank to [Formula: see text] on the north. Minimum gradients of [Formula: see text] were observed south of Nantucket Island. Velocities and velocity gradients are explained in relation to physical properties of the Cretaceous, Tertiary, and Pleistocene sediments. Isovelocity contours at 100-m/sec intervals are nearly horizontal in the upper 400 m. Isovelocity contours at greater depths show a greater difference from a mean depth because of the greater structural and lithological variation. Bottom densities inferred from the velocities range from 1.7 to [Formula: see text] and porosities range from 48 to 62 percent. The most significant factor controlling velocity distribution on Georges Bank is overburden pressure and resulting compaction. From the velocity data we conclude that Georges Bank has been partially overridden by a continental ice sheet.

scholarly journals Monitoring the acoustic ecology of the shelf break of Georges Bank, Northwestern Atlantic Ocean: New approaches to visualizing complex acoustic data

Marine Policy ◽  
2021 ◽  
Vol 130 ◽  
pp. 104570
Author(s):  
Sarah G. Weiss ◽  
Danielle Cholewiak ◽  
Kaitlin E. Frasier ◽  
Jennifer S. Trickey ◽  
Simone Baumann-Pickering ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Shelf Break ◽  
Georges Bank ◽  
Acoustic Ecology ◽  
Acoustic Data ◽  
New Approaches

Redescription of Pennella instructa Wilson, 1917 (Copepoda: Pennellidae) from the swordfish (Xiphias gladius L.)

1986 ◽  
Vol 64 (3) ◽  
pp. 727-730 ◽  
Author(s):  
W. E. Hogans
Keyword(s):  
Atlantic Ocean ◽  
Georges Bank ◽  
Northwest Atlantic ◽  
Lateral Horn ◽  
Xiphias Gladius

Two specimens of Pennella instructa Wilson, 1917 are described from swordfish (Xiphias gladius L.) collected off Georges Bank in the northwest Atlantic Ocean. This mesoparasitic copepod is characterized by two lateral horn holdfasts extending posteriorly parallel to the neck, distinct groups of papillae on the anterior end of the cephalothorax, and five-segmented and setose first antennae.

Electron Microscopy in the Study of Natural Phytoplankton Assemblages

1985 ◽  
Vol 43 ◽  
pp. 620-623
Author(s):  
Linda Sicko-Goad
Keyword(s):  
Electron Microscopy ◽  
Aquatic Environment ◽  
Size Range ◽  
Physical Parameters ◽  
Specific Information ◽  
Phytoplankton Assemblages ◽  
Phytoplankton Productivity ◽  
Ecosystem Effects ◽  
Time Of Year ◽  
Species Specific

Although the use of electron microscopy and its varied methodologies is not usually associated with ecological studies, the types of species specific information that can be generated by these techniques are often quite useful in predicting long-term ecosystem effects. The utility of these techniques is especially apparent when one considers both the size range of particles found in the aquatic environment and the complexity of the phytoplankton assemblages.The size range and character of organisms found in the aquatic environment are dependent upon a variety of physical parameters that include sampling depth, location, and time of year. In the winter months, all the Laurentian Great Lakes are uniformly mixed and homothermous in the range of 1.1 to 1.7°C. During this time phytoplankton productivity is quite low.

64: Rapid, Species-Specific Detection of Uropathogens from Clinical Urine Specimens Using an Electrochemical Microsensor Array

2005 ◽  
Vol 173 (4S) ◽  
pp. 18-18
Author(s):  
Joseph C. Liao ◽  
Mitra Mastali ◽  
David A. Haake ◽  
Bernard M. Churchill
Keyword(s):  
Specific Detection ◽  
Species Specific ◽  
Urine Specimens
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