Comparação entre as assinaturas tafonômicas de associações de foraminíferos subfósseis das enseadas do Flamengo e da Fortaleza, São Paulo, Brasil

Silva, Juliana Braga; Duleba, Wânia

doi:10.4072/rbp.2013.2.08

Cited by 5 publications

(1 citation statement)

References 47 publications

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“…were previously deposited, and are for some time undergoing many alterations that the different colors indicate (Batista et al 2007). If the tests are deposited in oxidant environment or if those containing sulfides are relocated to the oxidation zone, by erosion or by the action of excavating organisms, the sulfides present in the tests are reoxidized to hydroxides and/ or iron oxides, and the tests gain a brownish color (Maiklem 1967, Duleba 1994, Silva & Duleba 2013, for example.…”

Section: Foraminifera -Taphonomic Structurementioning

confidence: 99%

Foraminiferal assemblage structure from Brazilian tropical urbanized beaches (~7°S)

Alves

Júnior

2020

An. Acad. Bras. Ciênc.

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Foraminifera are diversifi ed protists with high ecological and bioindicator importance. Physical-chemical parameters of the environment can be evaluated through the taphonomic analysis of the test coloring, because once they settle in the sediment their tests begin to behave as sedimentary particles. Five urbanized tropical Brazilian beaches were sampled in this study in order to characterize the diversity, abundance, taxonomic and taphonomic structure of Foraminifera assemblages. General environmental characterization such as granulometric analysis, temperature and salinity was also performed. A total of 69 foraminiferan species were found, dominated by Quinqueloculina lamarckiana, Archaias angulatus, Amphistegina lessonii, Ammonia tepida and Eponides repandus. A large predominance of dead tests (>90%) was found, and only them were considered in further analyses. The cluster based on the taxonomic composition formed two groups, separating Miramar from the other beaches. Miramar was dominated by Ammonia tepida (18.9%), Sorites marginalis (16.8%), Quinqueloculina lamarckiana (13.9%) and Textularia agglutinans (10.2%), and had the highest density, number of species and diversity, what may be related with the sheltered nature of this beach and the dominance of fi ne sand. The other four beaches have high oceanic infl uence and the medium and coarse sand predominated. In these beaches Quinqueloculina lamarckiana dominated, representing between 30.9 and 38.7% of total foraminiferans. The taphonomic analysis indicates that Miramar presents a high deposition of tests and a low hydrodynamic energy, since the majority of tests were white. In Bessa, Manaíra and Seixas most of the tests were brownish, which is characteristic of beaches with high hydrodynamic energy, which causes the tests to be constantly brought to the oxidation zone.

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Section: Foraminifera -Taphonomic Structurementioning

confidence: 99%