Holocene benthic foraminifera from Bahía Blanca estuary: a review and update of systematic and palaeoenvironmental aspects

Assemblages of benthic foraminifera in a Holocene core from the outer area of Bahía Blanca estuary in Argentina were studied. The systematic of the group was updated, and provided 28 genera distributed among 59 species, six species with nomenclature aperta. The main species recorded were Buccella pe...

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Bibliographic Details
Published in:Holocene (Sevenoaks) 2009-12, Vol.19 (8), p.1221-1231
Main Authors: Cusminsky, Gabriela C., Bernasconi, Emiliana, Calvo-Marcilese, Lydia
Format: Article
Language:English
Subjects:
Ammonia beccarii
Aquatic life
Brackish
Buccella
Campsis
Climate change
Earth sciences
Earth, ocean, space
Elphidium articulatum
Elphidium discoidale
Elphidium galvestonense
Elphidium gunteri
Environmental studies
Exact sciences and technology
Geological time
Marine
Methodology and general studies
Paleobotany
Paleoecology
Paleontology
Prehistory and protohistory
Sea level
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Summary:Assemblages of benthic foraminifera in a Holocene core from the outer area of Bahía Blanca estuary in Argentina were studied. The systematic of the group was updated, and provided 28 genera distributed among 59 species, six species with nomenclature aperta. The main species recorded were Buccella peruviana f. campsi (Boltovskoy), Ammonia beccarii (Linné), Elphidium gunteri Cole, Elphidium galvestonense Kornfeld, Elphidium articulatum d’Orbigny and Elphidium discoidale (d’Orbigny). These species allowed an estuarine environment to be determined. Qualitative and quantitative studies conducted on the faunistic content in the core allowed identification of three subenvironments closely linked to sea-level fluctuations during the mid Holocene: a lower zone (6350 yr BP) corresponding to a high intertidal environment, an intermediate zone (2460 yr BP) representing a low intertidal environment related to a system of channels and variations in environmental energy, and an upper zone characterized by the development of a high-energy littoral environment affected by the action of waves, tides and tidal currents, which underwent progressive change until it attained present-day conditions.
ISSN:0959-6836
1477-0911
DOI:10.1177/0959683609345085