scholarly journals DISTRIBUTION PATTERNS OF COMMON SEASTARS OF THE MIDDLE ATLANTIC CONTINENTAL SHELF OF THE NORTHWEST ATLANTIC (GULF OF MAINE TO CAPE HATTERAS)

1981 ◽  
Vol 160 (3) ◽  
pp. 394-418 ◽  
Author(s):  
D. R. FRANZ ◽  
E. K. WORLEY ◽  
A. S. MERRILL
Keyword(s):  
Continental Shelf ◽  
Gulf Of Maine ◽  
Distribution Patterns ◽  
Northwest Atlantic ◽  
Middle Atlantic ◽  
Cape Hatteras

scholarly journals A Shelf Water Cascading Event near Cape Hatteras

2021 ◽  
Author(s):  
Lu Han ◽  
Harvey Seim ◽  
John Bane ◽  
Robert E. Todd ◽  
Mike Muglia
Keyword(s):  
Continental Shelf ◽  
Gulf Stream ◽  
Stream Water ◽  
Subsurface Layer ◽  
Open Ocean ◽  
South Atlantic Bight ◽  
Shelf Water ◽  
Carbon Export ◽  
Middle Atlantic ◽  
Cape Hatteras

AbstractCarbon-rich Middle Atlantic Bight (MAB) and South Atlantic Bight (SAB) shelf waters typically converge on the continental shelf near Cape Hatteras. Both are often exported to the adjacent open ocean in this region. During a survey of the region in mid-January 2018, there was no sign of shelf water export at the surface. Instead, a subsurface layer of shelf water with high chlorophyll and dissolved oxygen was observed at the edge of the Gulf Stream east of Cape Hatteras. Strong cooling over the MAB and SAB shelves in early January led to shelf waters being denser than offshore surface waters. Driven by the density gradient, the denser shelf waters cascaded beneath the Gulf Stream and were subsequently entrained into the Gulf Stream, as they were advected northeastward. Underwater glider observations 80 km downstream of the export location captured 0.44 Sv of shelf waters transported along the edge of the Gulf Stream in January 2018. In total, as much as 7×106 kg of carbon was exported from the continental shelf to a greater depth in the open ocean during this 5-day-long cascading event. Earlier observations of near-bottom temperature and salinity at a depth of 230 m captured several multiday episodes of shelf water at a location that was otherwise dominated by Gulf Stream water, indicating that the January 2018 cascading event was not unique. Cascading is an important, yet little-studied pathway of carbon export and sequestration at Cape Hatteras.

Blood parasites from fish of the Gulf of Maine to Cape Hatteras, Northwest Atlantic Ocean, with notes on the distribution of fish hematozoa

1982 ◽  
Vol 60 (3) ◽  
pp. 396-402 ◽  
Author(s):  
R. A. Khan ◽  
M. W. Newman
Keyword(s):  
Atlantic Ocean ◽  
Gulf Of Maine ◽  
Demersal Fish ◽  
The United States ◽  
Infected Fish ◽  
Blood Parasites ◽  
Northwest Atlantic ◽  
Northern Latitudes ◽  
Blood Smears ◽  
Cape Hatteras

Examination of blood smears from 657 marine fish collected from the continental shelf off the east coast of the United States, Cape Hatteras to the Gulf of Maine, revealed hematozoa in 19 of 39 species. Among the infected fish species, hemogregarines were more prevalent (17%) than trypanosomes (5%), piroplasms (4%), or trypanoplasms (1%). Ten species were infected with the virus that causes piscine erythrocytic necrosis. Prevalence of hemogregarines was higher in pleuronectiform and gadiform fish than among perciform species. Sedentary benthic species, especially flatfishes, and some demersal fish, were infected more often than pelagic species. Comparison of this survey with previous studies in the Northwest Atlantic suggests that hematozoa are more prevalent among fish in areas north of Newfoundland and decrease towards the equator. Piroplasms are reported only from fish occurring in temperate Atlantic waters. Piscivorous species of leeches, which are suspected or proven vectors of hematozoa, are more prevalent in the arctoboreal than in the neotropical Atlantic Ocean, and might account for the higher prevalence of piscine hematozoa in the northern latitudes.

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