Almeida C. M. auteur aut IRD Barbosa C. F. auteur aut IRD Cordeiro R. C. auteur aut IRD Seoane J. C. S. auteur aut IRD Fermino G. M. auteur aut IRD Silva P. O. auteur aut IRD Turcq Bruno auteur aut IRD text journalArticle eng text/pdf born digital access This study assesses the 3-kyr paleoecology and sedimentary evolution of the Abrolhos carbonate shelf, Bahia, Brazil, using a two-meter-long core collected in a carbonate muddy sediment. The paleoecology was based on the distribution of benthic foraminifer functional groups associated with grain size, total organic carbon (TOC), total nitrogen (TN), C/N and delta C-13. The results identified three biosedimentary units showing that symbiont-bearing foraminifers (Peneroplis and Archaias) decrease in abundance. However, other small taxa (Miliolinella and Cornuspira) and stress-tolerant genera (Bolivina, Elphidium and Ammonia) increase in abundance toward the core top. Grain size decreases toward the top of the core, suggesting a weakening of hydrodynamic winnowing toward recent time. The TOC and TN concentrations increase, and the C/N ratios decrease, suggesting an increase of marine productivity from nearby goblet-shaped structures called "chapeiroes". Changes in the benthic foraminifer community can be linked to the sedimentological and organic matter input, which are the result of climatic and oceanographic variations at different spatial and time scales, thus illustrating reduced potential to support symbiont-bearing foraminifer communities to the end of the Holocene. specialized Benthic foraminifers Geochemistry Southwest Atlantic Sediment Brazilian margin BRESIL ATLANTIQUE SUD OUEST 064 034 70 SI 168-176 2013 0278-4343 https://www.documentation.ird.fr/hor/fdi:010061430 10.1016/j.csr.2013.05.012 0278-4343 [F B010061430] https://www.documentation.ird.fr/hor/fdi:010061430 https://www.documentation.ird.fr/intranet/publi/2014/01/010061430.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2014-02-05 2017-08-23 fdi:010061430 fre