Porolithon improcerum (Porolithoideae, Corallinaceae) and Mesophyllum macroblastum (Melobesioideae, Hapalidiaceae): new records of crustose coralline red algae for the Southwest Atlantic Ocean

Phytotaxa ◽  
2014 ◽  
Vol 190 (1) ◽  
pp. 38 ◽  
Author(s):  
Ricardo Da Gama Bahia ◽  
Gilberto Menezes Amado Filho ◽  
Jonas Azevedo ◽  
Gavin Willian Maneveldt
Keyword(s):  
Atlantic Ocean ◽  
New Records ◽  
Brazilian Coast ◽  
Southwest Atlantic ◽  
Coralline Red Algae ◽  
Red Algal ◽  
Cell Layers ◽  
Northern Atlantic ◽  
Pore Canals ◽  
Northern Atlantic Ocean

Here we describe in detail two crustose coralline red algal (CCA) species newly reported for the southern Atlantic: Porolithon improcerum and Mesophyllum macroblastum. Porolithon improcerum was recorded on the remote oceanic island of Martim Vaz (ca. 1,200 km off the Brazilian Coast) and M. macroblastum on the Cagarras Archipelago (ca. 5 km off the coast of Rio de Janeiro city). Within the genus Porolithon, P. improcerum is characterized by thin vegetative thallus composed mostly of two cell layers and thalli forming several applanate branches overgrowing one another. Within the genus Mesophyllum, M. macroblastum is characterized by bearing volcano-like multiporate tetrasporangial conceptacles with a raised rim and sunken central pore plate in addition to pore canals of conceptacles being lined by cells that are similar in size and shape to other roof cells. While, P. improcerum has previously been reported for the northern Atlantic Ocean, this study represents the first report of M. macroblastum for the Atlantic Ocean.

The first Tertiary (Paleocene) marine mollusks from the Eureka Sound Group, Ellesmere Island, Canada

1991 ◽  
Vol 65 (2) ◽  
pp. 242-248 ◽  
Author(s):  
Louie Marincovich ◽  
William J. Zinsmeister
Keyword(s):  
Atlantic Ocean ◽  
South Dakota ◽  
Arctic Ocean ◽  
Canadian Arctic ◽  
Ellesmere Island ◽  
Marine Mollusks ◽  
Molluscan Fauna ◽  
Northern Atlantic ◽  
Northern Alaska ◽  
Northern Atlantic Ocean

The gastropod Drepanochilus pervetus (Stanton) and the bivalve Cytrodaria rutupiensis (Morris) occur in the Mount Moore Formation at Strathcona Fiord, west-central Ellesmere Island, northern Canada. They are the first marine mollusks identified from the Eureka Sound Group of the Canadian arctic islands. These mollusks correlate with Paleocene faunas of the Cannonball Formation of North Dakota and South Dakota, the Prince Creek Formation of northern Alaska, the Barentsburg Formation of Svalbard, and the Thanet and Oldhaven Formations of southeastern England. These occurrences imply that the earliest Tertiary Arctic Ocean molluscan fauna was compositionally distinct from coeval faunas of the northern Atlantic Ocean.

Arctic meteorological operations and counter-operations during world War II

Polar Record ◽  
1983 ◽  
Vol 21 (135) ◽  
pp. 559-567 ◽  
Author(s):  
Franz Selinger ◽  
Alexander Glen
Keyword(s):  
World War Ii ◽  
Atlantic Ocean ◽  
The United States ◽  
Northern Europe ◽  
Free Access ◽  
World War ◽  
The North ◽  
The North Sea ◽  
Northern Atlantic ◽  
Northern Atlantic Ocean

By autumn 1940 the first round of fighting in World War II was over. In northern Europe, German forces occupied Poland, Norway and Denmark. Both sides recognized that further operations demanded naval and air superiority in northern waters. Germany needed free access to the Atlantic Ocean through the North Sea; Britain had to prevent that access, which threatened the lifeline to the United States. More than ever before, it became essential for both sides to have meteorological information from the northern Atlantic Ocean area. Germany's need was especially acute, for the routes for her shipping from ports in Scandinavia traversed enemy-patrolled waters, where foul weather was essential for evasion.

scholarly journals New records of Bentharca asperula (Dall, 1881) (Mollusca, Bivalvia, Arcidae) from Brazil

2009 ◽  
Vol 9 (4) ◽  
pp. 281-283 ◽  
Author(s):  
Flávio Dias Passos ◽  
Adolpho Birman
Keyword(s):  
Atlantic Ocean ◽  
Rio De Janeiro ◽  
New Records ◽  
Sao Paulo ◽  
Brazilian Coast ◽  
São Paulo ◽  
Wide Spread ◽  
Hinge Line ◽  
Deep Waters

Specimens of Bentharca asperula (Dall, 1881) were obtained from deep waters of the coasts of the Rio de Janeiro and São Paulo States, and their shells described, illustrated and compared with descriptions and illustrations obtained from the literature. This species has a small strongly inequilateral shell, trapezoidal in outline and expanded ventro-posteriorly; their umbos are placed at about 1/3 of the anterior length of their straight hinge line. The external sculpture consists of irregular spaced concentric ridges, intercepted by fine radiating striae; the periostracum is hairy, forming a cover as a thatch. Hinge teeth are small, disposed in two series interrupted by the ligament. With this finding of living specimens from the Bacia de Campos, the distribution of B. asperula can now be extended in the Brazilian coast, confirming its wide spread in the Atlantic Ocean.

scholarly journals Lagrangian Eddy Scales in the Northern Atlantic Ocean

2002 ◽  
Vol 32 (9) ◽  
pp. 2425-2440 ◽  
Author(s):  
Rick Lumpkin ◽  
Anne-Marie Treguier ◽  
Kevin Speer
Keyword(s):  
Atlantic Ocean ◽  
Gulf Stream ◽  
Deep Ocean ◽  
High Energy ◽  
Length Scale ◽  
Length Scales ◽  
Near Surface ◽  
Northern Atlantic ◽  
Eddy Field ◽  
Northern Atlantic Ocean

Abstract Eddy time and length scales are calculated from surface drifter and subsurface float observations in the northern Atlantic Ocean. Outside the energetic Gulf Stream, subsurface timescales are relatively constant at depths from 700 m to 2000 m. Length scale and the characteristic eddy speed decrease with increasing depth below 700 m, but length scale stays relatively constant in the upper several hundred meters of the Gulf Stream. It is suggested that this behavior is due to the Lagrangian sampling of the mesoscale field, in limits set by the Eulerian eddy scales and the eddy kinetic energy. In high-energy regions of the surface and near-surface North Atlantic, the eddy field is in the “frozen field” Lagrangian sampling regime for which the Lagrangian and Eulerian length scales are proportional. However, throughout much of the deep ocean interior, the eddy field may be in the “fixed float” regime for which the Lagrangian and Eulerian timescales are nearly equal. This does not necessarily imply that the deep interior is nearly linear, as fixed-float sampling is possible in a flow field of O(1) nonlinearity.

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