Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages
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 38.3º S, deeper than 100 m, in...
Main Authors: | , , , , |
---|---|
Format: | Article |
Language: | English |
Published: |
Instituto Internacional de Ecologia
|
Series: | Brazilian Journal of Biology |
Subjects: | |
Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842012000400010&lng=en&tlng=en |
id |
doaj-92848ba5c5494ad2a97a23adf7b8c8b4 |
---|---|
record_format |
Article |
spelling |
doaj-92848ba5c5494ad2a97a23adf7b8c8b42020-11-25T00:12:36ZengInstituto Internacional de EcologiaBrazilian Journal of Biology1678-4375723 suppl72375910.1590/S1519-69842012000400010S1519-69842012000400010Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblagesPPB Eichler0AR Rodrigues1BB Eichler2ES Braga3EJD Campos4Universidade Federal do Rio Grande do NorteUniversidade de São PauloUniversidade de São PauloUniversidade de São PauloUniversidade de São PauloMore 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 38.3º 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 37.5-38.9º S where two species (Globocassidulina subglobosa (Brady), Uvigerina peregrina (Cushman) take over. G. subglobosa, U. peregrina, and Hanzawaia boueana (D'Orbigny) are found at 27-33º 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 & Brönnimann), Arenoparrella mexicana (Kornfeld), Gaudryina exillis (Cushman & Brönnimann), Textularia earlandi (Parker) and thecamoebians in four sectors of the shelf. The presence of Bulimina marginata (D'Orbigny) between 34.1-32.8º S in the winter and 34.2-32.7º 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 (38.9º S), show that Malvinas currents are not influencing the sediment in the summer.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842012000400010&lng=en&tlng=enforaminifera diversitysubantarctic and subtropical shelf watersubtropical shelf frontfreshwater influence |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
PPB Eichler AR Rodrigues BB Eichler ES Braga EJD Campos |
spellingShingle |
PPB Eichler AR Rodrigues BB Eichler ES Braga EJD Campos Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages Brazilian Journal of Biology foraminifera diversity subantarctic and subtropical shelf water subtropical shelf front freshwater influence |
author_facet |
PPB Eichler AR Rodrigues BB Eichler ES Braga EJD Campos |
author_sort |
PPB Eichler |
title |
Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages |
title_short |
Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages |
title_full |
Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages |
title_fullStr |
Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages |
title_full_unstemmed |
Tracing latitudinal gradient, river discharge and water masses along the subtropical South American coast using benthic Foraminifera assemblages |
title_sort |
tracing latitudinal gradient, river discharge and water masses along the subtropical south american coast using benthic foraminifera assemblages |
publisher |
Instituto Internacional de Ecologia |
series |
Brazilian Journal of Biology |
issn |
1678-4375 |
description |
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 38.3º 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 37.5-38.9º S where two species (Globocassidulina subglobosa (Brady), Uvigerina peregrina (Cushman) take over. G. subglobosa, U. peregrina, and Hanzawaia boueana (D'Orbigny) are found at 27-33º 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 & Brönnimann), Arenoparrella mexicana (Kornfeld), Gaudryina exillis (Cushman & Brönnimann), Textularia earlandi (Parker) and thecamoebians in four sectors of the shelf. The presence of Bulimina marginata (D'Orbigny) between 34.1-32.8º S in the winter and 34.2-32.7º 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 (38.9º S), show that Malvinas currents are not influencing the sediment in the summer. |
topic |
foraminifera diversity subantarctic and subtropical shelf water subtropical shelf front freshwater influence |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-69842012000400010&lng=en&tlng=en |
work_keys_str_mv |
AT ppbeichler tracinglatitudinalgradientriverdischargeandwatermassesalongthesubtropicalsouthamericancoastusingbenthicforaminiferaassemblages AT arrodrigues tracinglatitudinalgradientriverdischargeandwatermassesalongthesubtropicalsouthamericancoastusingbenthicforaminiferaassemblages AT bbeichler tracinglatitudinalgradientriverdischargeandwatermassesalongthesubtropicalsouthamericancoastusingbenthicforaminiferaassemblages AT esbraga tracinglatitudinalgradientriverdischargeandwatermassesalongthesubtropicalsouthamericancoastusingbenthicforaminiferaassemblages AT ejdcampos tracinglatitudinalgradientriverdischargeandwatermassesalongthesubtropicalsouthamericancoastusingbenthicforaminiferaassemblages |
_version_ |
1725398688095797248 |