New insights to discriminate between Sympterygia acuta Garman 1877 and Sympterygia bonapartii Müller & Henle, 1841 (Rajidae) of the Southwest Atlantic Ocean: on the use of geometric morphometrics and spinulation patterns

2015 ◽  
Vol 31 (2) ◽  
pp. 381-389 ◽  
Author(s):  
P. Orlando ◽  
M. González-Castro ◽  
E. Mabragaña
Keyword(s):  
Atlantic Ocean ◽  
Geometric Morphometrics ◽  
Southwest Atlantic

Benthic communities in the Southwest Atlantic Ocean: Conservation value of animal forests at the Burdwood Bank slope

2020 ◽  
Vol 30 (3) ◽  
pp. 426-439 ◽  
Author(s):  
Laura Schejter ◽  
Gabriel Genzano ◽  
Esteban Gaitán ◽  
Carlos D. Perez ◽  
Claudia S. Bremec
Keyword(s):  
Atlantic Ocean ◽  
Benthic Communities ◽  
Conservation Value ◽  
Southwest Atlantic ◽  
Bank Slope ◽  
Burdwood Bank ◽  
Ocean Conservation

scholarly journals Medusae and ctenophores from the Bahía Blanca Estuary and neighboring inner shelf (Southwest Atlantic Ocean, Argentina)

2017 ◽  
Vol 10 (1) ◽  
Author(s):  
M. Sofía Dutto ◽  
Gabriel N. Genzano ◽  
Agustín Schiariti ◽  
Julieta Lecanda ◽  
Mónica S. Hoffmeyer ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Inner Shelf ◽  
Bahía Blanca Estuary ◽  
Southwest Atlantic ◽  
Blanca Estuary

scholarly journals Composition of Trichiuridae and Gempylidae larvae (Teleostei) and their association with water masses in the Southwest Atlantic Ocean

2009 ◽  
Vol 38 (4) ◽  
Author(s):  
Paulo Júnior ◽  
Christiane de Souza ◽  
Graciela Weiss
Keyword(s):  
Temperature Gradient ◽  
Atlantic Ocean ◽  
Continental Shelf ◽  
Mesh Size ◽  
Water Masses ◽  
Southwest Atlantic ◽  
Patos Lagoon ◽  
La Plata ◽  
Tropical Water ◽  
The Relationship

Composition of Trichiuridae and Gempylidae larvae (Teleostei) and their association with water masses in the Southwest Atlantic OceanIn this paper the relationship between temporal changes in the occurrence of water masses and Trichiuridae and Gempylidae larvae composition and distribution in the Southwest Atlantic ocean were analysed between 25° and 40° S. Ichthyoplankton was collected during the three expeditions of the Subtropical Convergence Project: Winter and Spring 1977, Autumn 1978 and Summer 1981, realized in the Southwest Atlantic waters. Oblique tows were conducted using a Hensen net with 250 μm mesh size. Steep salinity and temperature gradient were found, where the river outflows from La Plata river (Argentina) and Patos Lagoon (Brazil) met the Tropical Water over the continental shelf between 32 and 36° S. We examined 524 Hensen-net samples that contained about 283 larvae from five species of Trichiuridae and Gempylidae. The most abundant and frequent specie were

Uterine dynamics of the southern eagle rayMyliobatis goodei(Chondrichthyes: Myliobatidae) from the southwest Atlantic Ocean

2013 ◽  
Vol 80 (2) ◽  
pp. 187-194 ◽  
Author(s):  
J. H. Colonello ◽  
H. E. Christiansen ◽  
M. B. Cousseau ◽  
G. J. Macchi
Keyword(s):  
Atlantic Ocean ◽  
Southwest Atlantic

scholarly journals Occurrence and distribution of larval lanternfish (Myctophidae) from the southwest Atlantic Ocean

2010 ◽  
Vol 27 (4) ◽  
pp. 541-553 ◽  
Author(s):  
Márcia S. de Castro ◽  
William J. Richards ◽  
Ana Cristina T. Bonecker
Keyword(s):  
Atlantic Ocean ◽  
Southwest Atlantic

scholarly journals Genesis and Evolution of Ferromanganese Crusts from the Summit of Rio Grande Rise, Southwest Atlantic Ocean

Minerals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 349 ◽  
Author(s):  
Mariana Benites ◽  
James R. Hein ◽  
Kira Mizell ◽  
Terrence Blackburn ◽  
Luigi Jovane
Keyword(s):  
Atlantic Ocean ◽  
Shallow Water ◽  
Water Column ◽  
Rio Grande ◽  
Intermediate Water ◽  
Mode Water ◽  
Southwest Atlantic ◽  
Ferromanganese Crusts ◽  
Depositional Processes ◽  
Water Depths

The Rio Grande Rise (RGR) is a large elevation in the Atlantic Ocean and known to host potential mineral resources of ferromanganese crusts (Fe–Mn), but no investigation into their general characteristics have been made in detail. Here, we investigate the chemical and mineralogical composition, growth rates and ages of initiation, and phosphatization of relatively shallow-water (650–825 m) Fe–Mn crusts dredged from the summit of RGR by using computed tomography, X-ray diffraction, 87Sr/86Sr ratios, U–Th isotopes, and various analytical techniques to determine their chemical composition. Fe–Mn crusts from RGR have two distinct generations. The older one has an estimated age of initiation around 48–55 Ma and was extensively affected by post-depositional processes under suboxic conditions resulting in phosphatization during the Miocene (from 20 to 6.8 Ma). As a result, the older generation shows characteristics of diagenetic Fe–Mn deposits, such as low Fe/Mn ratios (mean 0.52), high Mn, Ni, and Li contents and the presence of a 10 Å phyllomanganate, combined with the highest P content among crusts (up to 7.7 wt %). The younger generation is typical of hydrogenetic crusts formed under oxic conditions, with a mean Fe/Mn ratio of 0.75 and mean Co content of 0.66 wt %, and has the highest mean contents of Bi, Nb, Ni, Te, Rh, Ru, and Pt among crusts formed elsewhere. The regeneration of nutrients from local biological productivity in the water column is the main source of metals to crusts, providing mainly metals that regenerate rapidly in the water column and are made available at relatively shallow water depths (Ni, As, V, and Cd), at the expense of metals of slower regeneration (Si and Cu). Additionally, important contributions of nutrients may derive from various water masses, especially the South Atlantic Mode Water and Antarctic Intermediate Water (AAIW). Bulk Fe–Mn crusts from the summit of RGR plateau are generally depleted in metals considered of greatest economic interest in crusts like Co, REE, Mo, Te, and Zr, but are the most enriched in the critical metals Ni and Li compared to other crusts. Further investigations are warranted on Fe–Mn crusts from deeper-water depths along the RGR plateau and surrounding areas, which would less likely be affected by phosphatization.

Seasonal succession of zooplankton in coastal waters of the Argentine Sea (Southwest Atlantic Ocean): prevalence of classical or microbial food webs

2013 ◽  
Vol 9 (4) ◽  
pp. 371-382 ◽  
Author(s):  
María Delia Viñas ◽  
Rubén Mario Negri ◽  
Georgina Daniela Cepeda ◽  
Daniel Hernández ◽  
Ricardo Silva ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Food Webs ◽  
Coastal Waters ◽  
Seasonal Succession ◽  
Southwest Atlantic ◽  
Argentine Sea ◽  
Microbial Food Webs
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