Tracing latitudinal gradient, river discharge and water masses along the Subtropical South American Coast using benthic Foraminifera assemblages


Autoria(s): Eichler, Patrícia Pinheiro Beck; Rodrigues, André Rosch; Eichler, Beatriz Beck; Saraiva, Elisabete de Santis Braga da Graca; Campos, Edmo Jose Dias
Contribuinte(s)

UNIVERSIDADE DE SÃO PAULO

Data(s)

01/11/2013

01/11/2013

02/08/2013

Resumo

More than 30% of Buccella peruviana (D'Orbigny), Globocassidulina crassa porrecta (Earland & Heron-Allen), Cibicides mackannai (Galloway & Wissler) and C. refulgens (Montfort) indicate the presence of cold Sub Antarctic Shelf Water in winter, from 33.5 to 38.3 degrees S, deeper than 100 m, in the southern part of the study area. In summer, the abundance of this association decreases to less than 15% around 37.5-38.9 degrees S where two species (Globocassidulina subglobosa (Brady), Uvigerina peregrina (Cushman) take over. G. subglobosa, U. peregrina, and Hanzawaia boueana (D'Orbigny) are found at 27-33 degrees S in both seasons in less than 55 m deep in the northern part, and are linked with warm Subtropical Shelf Water and Tropical Water. Freshwater influence was signalized by high silicate concentration and by the presence of Pseudononion atlanticum (Cushman), Bolivina striatula (Cushman), Buliminella elegantissima (D'Orbigny), Bulimina elongata (D'Orbigny), Elphidium excavatum (Terquem), E. poeyanum (D'Orbigny), Ammobaculites exiguus (Cushman & Bronnimann), Arenoparrella mexicana (Kornfeld), Gaudryina exillis (Cushman & Bronnimann), Textularia earlandi (Parker) and thecamoebians in four sectors of the shelf. The presence of Bulimina marginata (D'Orbigny) between 34.1-32.8 degrees S in the winter and 34.2-32.7 degrees S in the summer indicates that the influence of the Subtropical Shelf Front on the sediment does not change seasonally, otherwise, the presence of Angulogerina angulosa (Williamson) in the winter, only in Mar del Plata (38.9 degrees S), show that Malvinas currents are not influencing the sediment in the summer.

Brazilian National Council of Research [CNPq/PDE OC 200424/2005]

Brazilian National Council of Research

U.S. Office of Naval Research (ONR)

U.S. Office of Naval Research (ONR) [N00014-02-1-0295]

InterAmerican Institute for Global Change Research (IAI)

Inter-American Institute for Global Change Research (IAI) [SACC/CRN-061]

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [2004/01950-3]

Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP)

Capes (Coordenacao de aperfeicoamento de Pessoal de nivel superior) through the Edital Ciencias do Mar

Capes (Coordenacao de aperfeicoamento de Pessoal de nivel superior) through the Edital Ciencias do Mar

Identificador

BRAZILIAN JOURNAL OF BIOLOGY, SAO CARLOS, v. 72, n. 3, p. 723-759, 2012

1519-6984

http://www.producao.usp.br/handle/BDPI/37675

10.1590/S1519-69842012000400010

http://dx.doi.org/10.1590/S1519-69842012000400010

Idioma(s)

eng

Publicador

INT INST ECOLOGY

SAO CARLOS

Relação

BRAZILIAN JOURNAL OF BIOLOGY

Direitos

openAccess

Copyright INT INST ECOLOGY

Palavras-Chave #FORAMINIFERA DIVERSITY #SUBANTARCTIC AND SUBTROPICAL SHELF WATER #SUBTROPICAL SHELF FRONT #FRESHWATER INFLUENCE #CONTINENTAL-SHELF #NUTRIENT DISTRIBUTIONS #PLATA RIVER #BRAZIL #SEA #FRONT #BIOLOGY
Tipo

article

original article

publishedVersion