Recent sedimentation rates in the Caravelas estuary (Bahia, Brazil) using unsupported 210Pb and 137Cs modeling

2016 ◽  
Vol 104 (7) ◽  
Author(s):  
José Lourenço Friedmann Angeli ◽  
Natalia Venturini ◽  
Paulo Alves de Lima Ferreira ◽  
Rubens César Lopes Figueira
Keyword(s):  
Coral Reef ◽  
Atlantic Ocean ◽  
Brazilian Coast ◽  
Sedimentation Rates ◽  
Land Uses ◽  
Ecological Role ◽  
210Pb And 137Cs ◽  
Unsupported 210Pb ◽  
Southern Bahia ◽  
Southern Atlantic Ocean

AbstractThe Caravelas estuary is located in a zone of the Brazilian coast (Southern Bahia State) which has been submitted to different kinds of land uses during the last 50 years. This zone has an important ecological role, due to its mangroves and its location next to Abrolhos coral reef, the most important in the Southern Atlantic Ocean.

Radioanalytical assessment of sedimentation rates in Guajará Bay (Amazon Estuary, N Brazil): a study with unsupported 210Pb and 137Cs modeling

2013 ◽  
Vol 299 (1) ◽  
pp. 407-414 ◽  
Author(s):  
Patrícia Andrade Neves ◽  
Paulo Alves de Lima Ferreira ◽  
Márcia Caruso Bícego ◽  
Rubens Cesar Lopes Figueira
Keyword(s):  
Sedimentation Rates ◽  
210Pb And 137Cs ◽  
Unsupported 210Pb ◽  
Amazon Estuary

Marine Reservoir Corrections for the Brazilian Northern Coast Using Modern Corals

Radiocarbon ◽  
2019 ◽  
Vol 61 (2) ◽  
pp. 587-597
Author(s):  
Maria Isabela Oliveira ◽  
Carla Carvalho ◽  
Kita Macario ◽  
Heitor Evangelista ◽  
Saulo Lamounier ◽  
...  
Keyword(s):  
Coral Reef ◽  
Continental Shelf ◽  
Growth Rates ◽  
Brazilian Coast ◽  
Northern Coast ◽  
Southwestern Atlantic ◽  
Brazil Current ◽  
Southern Bahia ◽  
Density Band ◽  
Coral Reef System

ABSTRACTThe Abrolhos bank, in southern Bahia State (BA), is the largest coral reef system in the southwestern Atlantic. It is highly influenced by the Brazil Current (BC), since it is located in the continental shelf. By contrast, Todos os Santos Bay (TSB), in Salvador, capital of Bahia State (BA) has an important coral biodiversity, located in a bay inlet with restricted water circulation. Coral cores were collected in those sites and were analyzed for density band counting and by Th/U dating to estimate growth rates and age. In this work, we present 14C ages of some of these bands in order to evaluate the marine reservoir effect (MRE) to which the colonies were subjected during growth. It is the first study making use of coral skeleton samples for MRE determination for the Brazilian coast. ΔR was calculated to be –151±23 14C yr, while that for the TSB was –107±51 14C yr.

scholarly journals Marine magnetotellurics imaged no distinct plume beneath the Tristan da Cunha hotspot in the southern Atlantic Ocean

2017 ◽  
Vol 716 ◽  
pp. 52-63 ◽  
Author(s):  
Kiyoshi Baba ◽  
Jin Chen ◽  
Malte Sommer ◽  
Hisashi Utada ◽  
Wolfram H. Geissler ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Tristan Da Cunha ◽  
Marine Magnetotellurics ◽  
Southern Atlantic Ocean

Angusticopula rowlingiana, a new melosiroid diatom (Bacillariophyta) from Ascension Island (South Atlantic Ocean)

Phytotaxa ◽  
2019 ◽  
Vol 388 (2) ◽  
pp. 155 ◽  
Author(s):  
BART VAN DE VIJVER ◽  
SANDRA WILFERT ◽  
VACLAV HOUK ◽  
DAVID M. JOHN
Keyword(s):  
Electron Microscopy ◽  
New Species ◽  
Atlantic Ocean ◽  
Diatom Species ◽  
Ascension Island ◽  
Remote Island ◽  
A New Species ◽  
Similar Combination ◽  
Southern Atlantic Ocean ◽  
Scanning Electron

During a diatom survey of some samples from Ascension Island, a remote island located in the southern Atlantic Ocean, an unknown melosiroid diatom species was studied using both light and scanning electron microscopy. It proved to be a new species described as Angusticopula rowlingiana sp. nov. and characterized by a large number of narrow copulae in the girdle, a marginal ring of small granules, very small pores covering the entire valve face and occasionally having internal valves.                The new species is compared with all Angusticopula species known worldwide and with several Melosira species showing a similar combination of characters. Short notes on its ecology are included.

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.

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.

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