Benthic foraminiferal distribution on the southeastern Brazilian shelf and upper slope

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dc.contributor.authorBurone, Leticia
dc.contributor.authorde Mello e Sousa, Silvia Helena
dc.contributor.authorde Mahiques, Michel Michaelovitch
dc.contributor.authorValente, Paulo
dc.contributor.authorCiotti, Aurea [UNESP]
dc.contributor.authorYamashita, Cintia
dc.contributor.institutionUniversidade de São Paulo (USP)
dc.contributor.institutionFac Ingn
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionSecc Oceanol
dc.date.accessioned2014-05-20T13:12:21Z
dc.date.available2014-05-20T13:12:21Z
dc.date.issued2011-01-01
dc.description.abstractForaminiferal data were obtained from 66 samples of box cores on the southeastern Brazilian upper margin (between 23.8A degrees-25.9A degrees S and 42.8A degrees-46.13A degrees W) to evaluate the benthic foraminiferal fauna distribution and its relation to some selected abiotic parameters. We focused on areas with different primary production regimes on the southern Brazilian margin, which is generally considered as an oligotrophic region. The total density (D), richness (R), mean diversity (H) over bar', average living depth (ALD(X) ) and percentages of specimens of different microhabitats (epifauna, shallow infauna, intermediate infauna and deep infauna) were analyzed. The dominant species identified were Uvigerina spp., Globocassidulina subglobosa, Bulimina marginata, Adercotryma wrighti, Islandiella norcrossi, Rhizammina spp. and Brizalina sp.. We also established a set of mathematical functions for analyzing the vertical foraminiferal distribution patterns, providing a quantitative tool that allows correlating the microfaunal density distributions with abiotic factors. In general, the cores that fit with pure exponential decaying functions were related to the oligotrophic conditions prevalent on the Brazilian margin and to the flow of the Brazilian Current (BC). Different foraminiferal responses were identified in cores located in higher productivity zones, such as the northern and the southern region of the study area, where high percentages of infauna were encountered in these cores, and the functions used to fit these profiles differ appreciably from a pure exponential function, as a response of the significant living fauna in deeper layers of the sediment. One of the main factors supporting the different foraminiferal assemblage responses may be related to the differences in primary productivity of the water column and, consequently, in the estimated carbon flux to the sea floor. Nevertheless, also bottom water velocities, substrate type and water depth need to be considered.en
dc.description.affiliationUniv São Paulo, Inst Oceanog, BR-05508900 São Paulo, Brazil
dc.description.affiliationFac Ingn, Inst Fis, Montevideo 11000, Uruguay
dc.description.affiliationUNESP Campus Litoral Paulista, BR-11330900 Sao Vicente, SP, Brazil
dc.description.affiliationSecc Oceanol, Fac Ciencias, Montevideo 11400, Uruguay
dc.description.affiliationUnespUNESP Campus Litoral Paulista, BR-11330900 Sao Vicente, SP, Brazil
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.description.sponsorshipIdFAPESP: 06/59947-3
dc.description.sponsorshipIdFAPESP: 03/10740-0
dc.format.extent159-179
dc.identifierhttp://dx.doi.org/10.1007/s00227-010-1549-7
dc.identifier.citationMarine Biology. New York: Springer, v. 158, n. 1, p. 159-179, 2011.
dc.identifier.doi10.1007/s00227-010-1549-7
dc.identifier.issn0025-3162
dc.identifier.urihttp://hdl.handle.net/11449/328
dc.identifier.wosWOS:000285783700013
dc.language.isoeng
dc.publisherSpringer
dc.relation.ispartofMarine Biology
dc.relation.ispartofjcr2.215
dc.relation.ispartofsjr1,085
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.titleBenthic foraminiferal distribution on the southeastern Brazilian shelf and upper slopeen
dc.typeArtigo
dcterms.licensehttp://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dcterms.rightsHolderSpringer
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Biociências, São Vicentept

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Artigos - Ciências Biológicas - São Vicente