Distribution of living planktonic foraminifera in relation to oceanic processes on the southeastern continental Brazilian margin (23°S-25°S and 40°W-44°W)
The vertical distribution (0 to 100m) of planktonic foraminifera was investigated based on 40 tow samples that were collected in eight stations, during the austral summer of 2002, in a geographically restricted area (23°S-25°S and 40°W-44°W) on the southeastern Brazilian continental margin. Species&...
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ftria:oai:ria.ua.pt:10773/23240 2023-05-15T18:00:31+02:00 Distribution of living planktonic foraminifera in relation to oceanic processes on the southeastern continental Brazilian margin (23°S-25°S and 40°W-44°W) Sousa, S. H. M. de Godoi, S. S. Amaral, P. G. C. Vicente, T. M. Martins, M. V. A. Sorano, M. R. G. S. Gaeta, S. A. Passos, R. F. Mahiques, M. M. 2014 http://hdl.handle.net/10773/23240 https://doi.org/10.1016/j.csr.2013.11.027 eng eng Elsevier FAPESP - Proc. no. 2002/06633-0 0278-4343 http://hdl.handle.net/10773/23240 doi:10.1016/j.csr.2013.11.027 restrictedAccess Oligotrophic area Paleoceanographic proxies Planktonic foraminifera Upwelling Water-column habitat article 2014 ftria https://doi.org/10.1016/j.csr.2013.11.027 2022-05-25T18:35:44Z The vertical distribution (0 to 100m) of planktonic foraminifera was investigated based on 40 tow samples that were collected in eight stations, during the austral summer of 2002, in a geographically restricted area (23°S-25°S and 40°W-44°W) on the southeastern Brazilian continental margin. Species' abundances are low (less than 10 specimens/m3), which is typical of an oligotrophic area. The foraminifera assemblage is mainly composed of warm water species (Globigerinoides ruber white and pink forms), with a predominance of spinose and symbiont-bearing species. Temperature and inorganic nutrient enrichment of the surface are the main factors that control foraminiferal abundance and diversity; nevertheless salinity can also influence the ecological descriptors. The role of the deep chlorophyll maximum (DCM) in the distribution of foraminifera is not always clear, but the increase in the abundance of G. ruber (white and pink) seems to be related to a deeper DCM, and high salinities (S>36.5). The ecological habitat of these species is affected by the depth of the mixed layer, with a predominance of the white form in deeper layers. Increases in the foraminiferal diversity are related to the dynamics of the Brazil Current system, which displaces the area of high productivity in the euphotic zone off the coast. The abundances of Globigerina bulloides, Globigerina falconensis, Globigerinella calida and Globigerinella siphonifera follow the nutrient enrichment of the surface water mass, corroborating the usefulness of these species as paleoproductivity proxies in the study area. These data confirm the use of diversity measurements and assemblages composition for reconstructing past water column structures in subtropical oceans. Article in Journal/Newspaper Planktonic foraminifera Repositório Institucional da Universidade de Aveiro (RIA) Austral Continental Shelf Research 89 76 87 |
institution |
Open Polar |
collection |
Repositório Institucional da Universidade de Aveiro (RIA) |
op_collection_id |
ftria |
language |
English |
topic |
Oligotrophic area Paleoceanographic proxies Planktonic foraminifera Upwelling Water-column habitat |
spellingShingle |
Oligotrophic area Paleoceanographic proxies Planktonic foraminifera Upwelling Water-column habitat Sousa, S. H. M. de Godoi, S. S. Amaral, P. G. C. Vicente, T. M. Martins, M. V. A. Sorano, M. R. G. S. Gaeta, S. A. Passos, R. F. Mahiques, M. M. Distribution of living planktonic foraminifera in relation to oceanic processes on the southeastern continental Brazilian margin (23°S-25°S and 40°W-44°W) |
topic_facet |
Oligotrophic area Paleoceanographic proxies Planktonic foraminifera Upwelling Water-column habitat |
description |
The vertical distribution (0 to 100m) of planktonic foraminifera was investigated based on 40 tow samples that were collected in eight stations, during the austral summer of 2002, in a geographically restricted area (23°S-25°S and 40°W-44°W) on the southeastern Brazilian continental margin. Species' abundances are low (less than 10 specimens/m3), which is typical of an oligotrophic area. The foraminifera assemblage is mainly composed of warm water species (Globigerinoides ruber white and pink forms), with a predominance of spinose and symbiont-bearing species. Temperature and inorganic nutrient enrichment of the surface are the main factors that control foraminiferal abundance and diversity; nevertheless salinity can also influence the ecological descriptors. The role of the deep chlorophyll maximum (DCM) in the distribution of foraminifera is not always clear, but the increase in the abundance of G. ruber (white and pink) seems to be related to a deeper DCM, and high salinities (S>36.5). The ecological habitat of these species is affected by the depth of the mixed layer, with a predominance of the white form in deeper layers. Increases in the foraminiferal diversity are related to the dynamics of the Brazil Current system, which displaces the area of high productivity in the euphotic zone off the coast. The abundances of Globigerina bulloides, Globigerina falconensis, Globigerinella calida and Globigerinella siphonifera follow the nutrient enrichment of the surface water mass, corroborating the usefulness of these species as paleoproductivity proxies in the study area. These data confirm the use of diversity measurements and assemblages composition for reconstructing past water column structures in subtropical oceans. |
format |
Article in Journal/Newspaper |
author |
Sousa, S. H. M. de Godoi, S. S. Amaral, P. G. C. Vicente, T. M. Martins, M. V. A. Sorano, M. R. G. S. Gaeta, S. A. Passos, R. F. Mahiques, M. M. |
author_facet |
Sousa, S. H. M. de Godoi, S. S. Amaral, P. G. C. Vicente, T. M. Martins, M. V. A. Sorano, M. R. G. S. Gaeta, S. A. Passos, R. F. Mahiques, M. M. |
author_sort |
Sousa, S. H. M. |
title |
Distribution of living planktonic foraminifera in relation to oceanic processes on the southeastern continental Brazilian margin (23°S-25°S and 40°W-44°W) |
title_short |
Distribution of living planktonic foraminifera in relation to oceanic processes on the southeastern continental Brazilian margin (23°S-25°S and 40°W-44°W) |
title_full |
Distribution of living planktonic foraminifera in relation to oceanic processes on the southeastern continental Brazilian margin (23°S-25°S and 40°W-44°W) |
title_fullStr |
Distribution of living planktonic foraminifera in relation to oceanic processes on the southeastern continental Brazilian margin (23°S-25°S and 40°W-44°W) |
title_full_unstemmed |
Distribution of living planktonic foraminifera in relation to oceanic processes on the southeastern continental Brazilian margin (23°S-25°S and 40°W-44°W) |
title_sort |
distribution of living planktonic foraminifera in relation to oceanic processes on the southeastern continental brazilian margin (23°s-25°s and 40°w-44°w) |
publisher |
Elsevier |
publishDate |
2014 |
url |
http://hdl.handle.net/10773/23240 https://doi.org/10.1016/j.csr.2013.11.027 |
geographic |
Austral |
geographic_facet |
Austral |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_relation |
FAPESP - Proc. no. 2002/06633-0 0278-4343 http://hdl.handle.net/10773/23240 doi:10.1016/j.csr.2013.11.027 |
op_rights |
restrictedAccess |
op_doi |
https://doi.org/10.1016/j.csr.2013.11.027 |
container_title |
Continental Shelf Research |
container_volume |
89 |
container_start_page |
76 |
op_container_end_page |
87 |
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1766169640618164224 |