Distributions of ostracod (Crustacea) biofacies on the continental shelf off south-east Trinidad, western central Atlantic Ocean, suggest the location of an offshore river-induced front within the Orinoco Plume

2008 ◽  
Vol 88 (2) ◽  
pp. 199-211 ◽  
Author(s):  
Brent Wilson
Keyword(s):  
Atlantic Ocean ◽  
Continental Shelf ◽  
Central Atlantic

Lithophylloideae and Mastophoroideae (Corallinales, Rhodophyta) from the Brazilian continental shelf

Phytotaxa ◽  
2014 ◽  
Vol 190 (1) ◽  
pp. 112 ◽  
Author(s):  
Maria Carolina Henriques ◽  
RAFAEL RIOSMENA-RODRÍGUEZ ◽  
LUANA MIRANDA COUTINHO ◽  
MARCIA A. O. FIGUEIREDO
Keyword(s):  
Atlantic Ocean ◽  
Continental Shelf ◽  
First Record ◽  
Coralline Algae ◽  
Conservation Programs ◽  
Anatomical Analysis ◽  
Relevant Role

Brazilian continental shelf is rich in rhodolith beds and it has a relevant role as a critical ecosystem for conservation. However, we do not know the taxonomy of the rhodolith forming species and because of that we analysed samples from the REVIZEE project in which morpho-anatomical analysis was used to identify Lithophylloideae and Mastophoroideae species. We found Titanoderma pustulatum; Lithophyllum stictaeforme; Lithophyllum corallinae, Hydrolithon breviclavium, Hydrolithon onkodes and Spongites fruticulosus. This is the first detailed description of T. pustulatum from Brazil and S. fruticulosus from the Atlantic Ocean, the first record of H. breviclavium in the Atlantic Ocean and of H. onkodes in Brazilian water. L. corallinae was found 250 m deep—that is a new Coralline algae depth record for Brazilian waters. This study contributes to the understanding of the diversity in Brazilian continental shelf and indicates the importance of future systematic studies. This knowledge is relevant to guide conservation programs and evaluation of impacts.

scholarly journals The carbon budget of the North Sea

2005 ◽  
Vol 2 (1) ◽  
pp. 87-96 ◽  
Author(s):  
H. Thomas ◽  
Y. Bozec ◽  
H. J. W. de Baar ◽  
K. Elkalay ◽  
M. Frankignoulle ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Continental Shelf ◽  
North Sea ◽  
North Atlantic ◽  
Carbon Budget ◽  
North Atlantic Ocean ◽  
Carbon Sink ◽  
The North ◽  
The North Sea ◽  
The North Atlantic

Abstract. A carbon budget has been established for the North Sea, a shelf sea on the NW European continental shelf. The carbon exchange fluxes with the North Atlantic Ocean dominate the gross carbon budget. The net carbon budget – more relevant to the issue of the contribution of the coastal ocean to the marine carbon cycle – is dominated by the carbon inputs from rivers, the Baltic Sea and the atmosphere. The North Sea acts as a sink for organic carbon and thus can be characterised as a heterotrophic system. The dominant carbon sink is the final export to the North Atlantic Ocean. More than 90% of the CO2 taken up from the atmosphere is exported to the North Atlantic Ocean making the North Sea a highly efficient continental shelf pump for carbon.

scholarly journals From the Sea to the Land: Dynamic of the Sargassum Tide Holobiont in the Caribbean Islands

2020 ◽  
Author(s):  
Pascal Jean Lopez ◽  
Vincent Hervé ◽  
Josie Lambourdière ◽  
Malika René-Trouillefou ◽  
Damien Devault
Keyword(s):  
Atlantic Ocean ◽  
Trophic Interactions ◽  
Methanogenic Archaea ◽  
Caribbean Region ◽  
Brown Tides ◽  
The Caribbean ◽  
Risks Assessment ◽  
Specific Species ◽  
Associated Species ◽  
Central Atlantic

Abstract BackgroundOver the last decade, intensity and frequency of Sargassum blooms in the Caribbean Sea and central Atlantic Ocean have dramatically increased, causing growing ecological, social and economic concern throughout the entire Caribbean region. These golden-brown tides form an ecosystem that maintains life for a large number of associated species, and their circulation across the Atlantic Ocean support the displacement and maybe the settlement of various species, especially microorganisms. To comprehensively identify the micro- and meiofauna associated to Sargassum, one hundred samples were collected during the 2018 tide events that were the largest ever recorded.ResultsWe investigated the composition and the existence of specific species in three compartments, namely, Sargassum at tide sites, in the surrounding seawater, and in inland seaweed storage sites. Metabarcoding data revealed shifts between compartments in both prokaryotic and eukaryotic communities, and large differences for eukaryotes especially bryozoans, nematodes and ciliates. Among the most abundant nematodes, we identified various bacterivores in all compartments, suggesting trophic interactions in Sargassum tides. We also found a number of species of interest, including methanogenic archaea, sulfate- and nitrate-reducing bacteria as well as putative pathogens.ConclusionsHere we present novel information on the diversity and trophic interactions of the micro- and meiofauna that are associated with Sargassum at tide and storage sites. Such information may help to better understand the ecological consequences of the Sargassum crises, and to develop proper analyses of the Sargassum associated biodiversity that could be important for application purposes such as biogas or fertilizers production, and to local authority for risks assessment.

scholarly journals Transport and transfer rates in the waters of the continental shelf. Annual report. [Atlantic Ocean]

1976 ◽  
Author(s):  
P.E. Biscaye ◽  
W.S. Broecker ◽  
H.W. Feely ◽  
R.D. Gerard
Keyword(s):  
Atlantic Ocean ◽  
Continental Shelf ◽  
Annual Report ◽  
Transfer Rates

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

scholarly journals Seismic stratigraphy of Cretaceous eastern Central Atlantic Ocean: Basin evolution and palaeoceanographic implications

2018 ◽  
Vol 499 ◽  
pp. 107-121 ◽  
Author(s):  
Yannick Mourlot ◽  
Gérôme Calvès ◽  
Peter D. Clift ◽  
Guillaume Baby ◽  
Anne-Claire Chaboureau ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Seismic Stratigraphy ◽  
Ocean Basin ◽  
Basin Evolution ◽  
Central Atlantic

AGE AND GROWTH OF THE BLUE SHARK PRIONACE GLAUCA IN THE EASTERN ATLANTIC OCEAN

KSTU News ◽  
2021 ◽  
pp. 11-25
Author(s):  
Beraki Weldegiorgish Teklekhaimanot ◽  
Sergey Vadimovich Shibaev ◽  
Sergey Yurievich Gulyugin
Keyword(s):  
Atlantic Ocean ◽  
Growth Parameters ◽  
Growth Function ◽  
Age And Growth ◽  
Growth Band ◽  
Prionace Glauca ◽  
Western Africa ◽  
Eastern Atlantic Ocean ◽  
Digital Microscope ◽  
Central Atlantic

In this study, 292 blue sharks Prionace glauca (Linnaeus, 1758) (from 151 to 305 cm total length, TL) were collected off western Africa in the eastern central Atlantic Ocean between 1980 and 1982. Vertebral sections of females specimens ranged from 175 to 300 cm and males specimens ranged from 166 to 312 cm TL were processed and analyzed for age and growth parameters. Growth band pairs (translucent and opaque bands) were counted on the images photographed from the stained whole vertebrae using digital microscope called Digi Scope II. The band pairs after the birthmark were counted from 3 to 12 for males and from 4 to 13 for females. Growth parameters were derived using the Von Bertalanffy growth function (VBGF) based on FISAT and solver solution Microsoft excel and Ford Wall-Ford. VBGF was that which best fit the data. Parameters derived from the combination of observed and back-calculated lengths, K = 0.1, L_∞ = 386.4 cm and t_0 = −1.35 year for males and K = 0.12 year -1, L_∞= 355 cm and t_0 = –1.02 year for females were considered to best describe growth. The longevity was estimated to be at least 23.7 and 28.3 years for females and males respectively. The natural mortality rate was estimated to be 0.15 year - 1 and 0.18 year -1 for males and females respectively.

Description of three new species of Ampelisca (Crustacea: Amphipoda: Ampeliscidae) from Southwestern Atlantic, with a key of the genus for Brazilian species

Zootaxa ◽  
2007 ◽  
Vol 1626 (1) ◽  
pp. 25-37 ◽  
Author(s):  
MARIA TERESA VALÉRIO-BERARDO
Keyword(s):  
New Species ◽  
Atlantic Ocean ◽  
Continental Shelf ◽  
Benthic Communities ◽  
Brazilian Coast ◽  
Southwestern Atlantic ◽  
Soft Bottom ◽  
Brazilian Species ◽  
Southwestern Atlantic Ocean ◽  
Three New Species

Ampelisca species are inhabitant of soft bottom marine benthic communities of tropical to cold – temperate zones. Prior to this paper, 11 species of the genus were recognized from Brazilian coast. Three new species of Ampelisca are herein described: Ampelisca longipropoda, Ampelisca meridionalis and Ampelisca youngi. The specimens were dredged from the continental shelf of Southwestern Atlantic Ocean between the latitudes 22°06’S and 34°32’S. A key to the Ampelisca species of the Brazilian coast is provided.

scholarly journals Concept of Biogenic Ferromanganese Crust Formation: Coccoliths as Bio-seeds in Crusts from Central Atlantic Ocean (Senghor Seamount/Cape Verde)

2011 ◽  
Vol 6 (5) ◽  
pp. 1934578X1100600
Author(s):  
Xiaohong Wang ◽  
Florian Peine ◽  
Alexander Schmidt ◽  
Heinz C. Schröder ◽  
Matthias Wiens ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Focused Ion Beam ◽  
Ion Beam ◽  
Deposition Process ◽  
Ferromanganese Crust ◽  
Cape Verde ◽  
Surface Zone ◽  
Ferromanganese Crusts ◽  
Central Atlantic ◽  
Scanning Electron

At depths of 2,000 to 3,000 m, seamounts from the Cape Verde archipelago (Central Atlantic Ocean) are largely covered with ferromanganese crusts. Here we studied 60 to 150 mm thick crusts from the Senghor Seamount (depth: 2257.4 m). The crusts have a non lamellated texture and are covered with spherical nodules. The chemical composition shows a dominance of MnO2 (26.1%) and Fe2O3 (38.8%) with considerable amounts of Co (0.74%) and TiO2 (2.1%). Analysis by scanning electron probe microanalyzer (EPMA) revealed a well defined compositional zonation of micro-layers; the distribution pattern of Mn does not match that of Fe. Analysis by high resolution scanning electron microscopy (SEM) revealed that coccospheres/coccoliths exist in the crust material as microfossils; most of the coccospheres/coccoliths are not intact. The almost circular coccoliths belong to the type of heterococcoliths and are taxonomically related to species of the family Calcidiscaceae. By energy dispersive X-ray spectroscopic analysis an accumulation of the coccoliths in the Mn- and Fe rich micronodules was detected. Focused ion beam assisted SEM mapping highlighted that the coccoliths in the crust are Mn rich, suggesting that the calcareous material of the algal skeleton has been replaced by Mn-minerals. We conclude that a biologically induced mechanism has been involved in the formation of the crusts, collected from the Cape Verde archipelago from depths of 2,000 to 3,000 m in the mixing region between the oxygen-minimum surface zone and the oxygen-rich deep waters; the deposition process might have been triggered by chemical reactions during the dissolution of the Ca-carbonate skeletons of the coccoliths allowing Mn(II) to oxidize to Mn(IV) and in turn to deposit this element in the crust material.

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