Living benthic Foraminifera from the Saquarema lagoonal system (Rio de Janeiro, southeastern Brazil)

Belart, Pierre; Laut, Vanessa Mattos; Clemente, Iara; Raposo, Débora; Martins, V.; Frontalini, Fabrizio; Lorini, Maria Lúcia; Fortes, Rafael; Laut, Lázaro

doi:10.15560/13.2.2062

Cited by 9 publications

(4 citation statements)

References 23 publications

(33 reference statements)

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“…Foraminifera: they are mainly represented by brackish lagoonal assemblage containing an oligospecific fauna characterized by the high dominance of Ammonia tepida (75-91%) accompanied by few species (mainly Haynesina germanica 4-8% and Porosononion granosum 1-19%). The low diversity (S: 3 to 7 taxa, Fisher α-index: 0.4 to 5, H: 0.3 to 1.7) and the high dominance of A. tepida, a euryhaline species, are indicative of an enclosed brackish lagoon [67][68][69][70][71]. This assemblage is recorded in BU5 core, from 330 to 300 cm and from 122 to 81 cm, and in BU7 core, from 216 to the top.…”

Section: Bio-indicators Of the Aquatic Paleoenvironmental Conditions mentioning

confidence: 95%

Holocene Evolution of the Burano Paleo-Lagoon (Southern Tuscany, Italy)

D’Orefice

Bellotti

Bertini

et al. 2020

Water

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The study of Burano paleo-lagoon—Wetland of International Value, has allowed us to better define and extend the reconstruction of the Holocene paleoenvironmental evolution of the paleo-lagoons previously studied, located on the Tyrrhenian coast in central Italy. The investigated area is located in Southern Tuscany near the Burano Lake. The area was investigated by means of field surveys, historical maps, 16 coring, sedimentological, palynological and microfaunal analyses (foraminifera and ostracods), combined with robust geochronological control provided by 52 datings (14C and OSL). The study allowed us to reconstruct the environmental and morphological evolution of the Burano paleo-lagoon during the last 8000 years and to hypothesize a Rise Sea Level (RSL) curve. In this context, 5 main evolutionary phases have been recognized. (1) before 7.5 ka BP in the southern-eastern part, an open lagoon developed; (2) ~6 ka BP a barrier-lagoon system develops throughout the entire area and the lagoon progressively changed from open to closed one; (3) ~5 ka BP the width of the lagoon increases and a lacustrine facies appears along the entire axis of the coastal basin; (4) ~4 ka BP the lacustrine facies shows a discontinuous distribution respect to the previous phase; (5) during the last 4 ka the lacustrine facies disappear and the lagoon turns into a wetland area.

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Section: Bio-indicators Of the Aquatic Paleoenvironmental Conditions mentioning

confidence: 95%

Holocene Evolution of the Burano Paleo-Lagoon (Southern Tuscany, Italy)

D’Orefice

Bellotti

Bertini

et al. 2020

Water

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“…9, 10; appendix 3) are commonly found in living assemblages of Brazilian coastal shallow waters (e.g. Delavy et al, 2016;Martins et al, 2016 a, b;Raposo et al, 2016Raposo et al, , 2018Belart et al, 2017Belart et al, , 2019Duleba et al, 2018). However, in the lower sedimentary layers (240-229 cm), in addition to a relatively high foraminiferal density and slight increase of diversity, the presence of Ammonia parkinsoniana, bolivinids and buliminids species (Figs.…”

Section: Influence Of Eutrophication On Benthic Foraminiferamentioning

confidence: 97%

“…The species identification was based on several references, such as Loeblich and Tappan (1988), Debenay et al (1998), Semensatto-Jr. and Dias-Brito (2004), Raposo et al (2016), Belart et al (2017) and Alves Martins et al (2019). The species nomenclature was updated following the World Foraminifera Database (Hayward et al, 2017).…”

Section: Foraminiferal Analysismentioning

confidence: 99%

Impact of Eutrophication on Benthic Foraminifera in Sepetiba Bay (Rio De Janeiro State, Se Brazil)

et al. 2019

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The main objective of this work is to analyze the consequences of eutrophication in benthic meiofaunal organisms (foraminifera) in an internal area of Sepetiba Bay (State of Rio de Janeiro, SE, Brazil). This study is interesting because, at the studied site, the sediments corresponding to the period of greatest accumulation of organic matter were not contaminated by metals, although Sepetiba Bay has areas known to be polluted by this type of contaminants. Thus, in this study, it was possible to consider only the impact caused by eutrophication.In the SP6 core, collected in the Sepetiba Bay internal area and studied in this work, textural, geochemical (concentration of chemical elements; 210Pb and 137Cs; radiocarbon data) and foraminifera were analyzed in a muddy section, with a few intercalations of sandy layers. The sediments of the analyzed section were deposited in the last ≈2,350 BP years. The concentrations of Al, Cd, Co, Fe, Mn, Ni, Pb, Sn, Ti, V and Zn are higher at the base of the core and decrease towards the top. The contents of TOC, P and Zr have inverse paterns. The ratios of these elements to their background value have similar patterns. However, previous studies have recognized that during the twentieth century Cd, Zn, Cr and Pb concentrations increased in several areas of Sepetiba Bay, mainly due to industrial activity. The area where this core was collected may have been dredged. Radiocarbon ages suggest a loss of ≈2000 years of sedimentary registration, marked by an unconformity at a depth of 126 cm, probably caused by dredging. A new sedimentary sequence unpolluted by metals but highly enriched in organic matter was deposited on the surface of that discontinuity. Foraminifera were quite abundants in the lower section (240-126 cm; between ≈2,400-2,090 years BP, execept in the sandy layers), corresponding to sediment deposition before dredging. After dredging, the accumulation of very fine-grained sediments rich in organic matter generated eutrophication phenomena, which caused a drastic reduction in the abundance and diversity of these organisms. This work testifies the effect of eutrophication on meiofaunal organisms. Although some coastal foraminifer species tolerate harmful effects caused by eutrophication, it is recognized that the impact has been so negative that even these species occur with reduced abundance in the study area. IMPACTO DA EUTROFICAÇÃO EM FORAMINIFEROS BÊNTONICOS NA BAÍA DE SEPETIBA (ESTADO DO RIO DE JANEIRO, SE BRASIL) ResumoO principal objetivo deste trabalho é analisar as conseqüências da eutrofização em organismos meiofaunais bentônicos (foraminíferos) em uma área interna da Baía de Sepetiba (Estado do Rio de Janeiro, SE, Brasil). Este estudo é interessante porque, no local estudado, os sedimentos correspondentes ao período de maior acumulação de matéria orgânica, não estavam contaminados por metais, apesar da Baía de Sepetiba ter áreas reconhecidamente poluídas por este tipo de contaminantes. Assim neste estudo foi possível considerar apenas o impacto causado pela eutrofização.No testemunho SP6, coletado na área interna da Baía de Sepetiba e estudado neste trabalho, foram analisados dados texturais, geoquímicos (concentração de elementos químicos; 210Pb e 137Cs; dados de radiocarbono) e foraminíferos numa secção lamosa, com intercalações de camadas arenosas.Os sedimentos da seção analisada foram depositados nos últimos 2.350 anos BP. As concentrações de Al, Cd, Co, Fe, Mn, Ni, Pb, Sn, Ti, V e Zn são mais elevadas na base do testemunho e diminuem em direção ao topo. O conteúdo de TOC, P e Zr possui padrões inversos. As razões destes elementos com o respectivo valor de fundo possuem padrões semelhantes. Porém, estudos anteriores reconheceram em várias áreas da Baía de Sepetiba um aumento das concentrações de Cd, Zn, Cr e Pb durante o século XX, principalmente devido à atividade industrial. A área onde foi coletado este testemunho poderá ter sido dragada. As idades de radiocarbono sugerem uma perda de aproximadamente 2000 anos de registro sedimentar, marcada por uma inconformidade a 126 cm de profundidade, causada provavelmente por dragagem. Uma nova sequência sedimentar não poluída por metais, mas bastante enriquecida em matéria orgânica foi depositada sobre a superfície da descontinuidade. Os foraminíferos eram relativamente abundantes na seção inferior (240-126 cm; entre ≈2.400-2.090 anos BP), correspondente á deposição de sedimentos antes da dragagem. Após a dragagem, a acumulação de sedimentos muito finos e ricos em matéria orgânica, gerou fenómenos de eutrofização, que terão causado uma redução drástica da abundância e diversidade destes organismos. Este trabalho testemunha o efeito da eutrofização em organismos meiofaunais. Apesar de algumas espécies de foraminíferos costeiros tolerarem efeitos nefastos causados pela eutrofização, reconhece-se que o impacto foi tão negativo que mesmo estas espécies ocorrem com abundância reduzida na área estudada. Palavras-chave: Área Costeira. Registro Paleoambiental. Impacto Antrópico. Meiofauna, Abordagem Multiproxy.

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“…The species identification was based on several references, such as Loeblich and Tappan (1988), Debenay et al (1998), Semensatto-Jr. and Dias-Brito (2004), Raposo et al (2016) and Belart et al (2017). The species nomenclature was updated following the World Foraminifera Database (Hayward et al, 2017).…”

Section: Foraminiferamentioning

confidence: 99%

Holocene Closure of a Barrier Beach in Sepetiba Bay and Its Environmental Impact (Rio De Janeiro, Brazil)

et al. 2017

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. Late Holocene closure of a barrier beach in Sepetiba Bay and its environmental impact (Rio de Janeiro, Brazil). Journal of Sedimentary Environments, 2 (1): 65-80. AbstractCore T4 (with 286 cm long) collected in the inner part of Sepetiba Bay is a record of late Holocene evolution of Sepetiba Bay. This core was described and sampled every 2 cm. Textural, geochemical and foraminifera data were analyzed, and two radiocarbon dates were obtained. Estimated ages indicate that core T4 represents the last ≈4,000 years calibrated before present (yrs cal BP). Results of this core suggest that coarse sediments, recorded in the period between ≈4,000-3,400 yrs cal BP, were probably associated with high hydrodynamic conditions in the study area. These sediments should be deposited at an incipient phase of the Marambaia Beach Barrier evolution. The development of this sand barrier resulted in the confinement of the inner region of Sepetiba Bay, leading to the deposition of muddy sediments rich in organic matter. Organic matter enrichment increased especially in the last ≈500 yrs cal BP. Foraminifera assemblages and carbonates content indicate that the studied region should have been affected in the last ≈3,400 yrs cal BP by changes in the water depth column. An increase of the water column depth was recorded for example between ≈850-350 yrs BP. The results obtained in the core T4 show that the confinement and eutrophication process of the internal zone of Sepetiba Bay has been occurring since ≈3,400 yrs cal BP and is being caused by other factors such as geomorphological and climatic changes and human activities.

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Living benthic Foraminifera from the Saquarema lagoonal system (Rio de Janeiro, southeastern Brazil)

Cited by 9 publications

References 23 publications

Holocene Evolution of the Burano Paleo-Lagoon (Southern Tuscany, Italy)

Holocene Evolution of the Burano Paleo-Lagoon (Southern Tuscany, Italy)

Impact of Eutrophication on Benthic Foraminifera in Sepetiba Bay (Rio De Janeiro State, Se Brazil)

Holocene Closure of a Barrier Beach in Sepetiba Bay and Its Environmental Impact (Rio De Janeiro, Brazil)

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