Ecology of Quaternary benthic foraminiferal assemblages on the Amazon shelf,northern Brazil |
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| Authors: | Claudia Gutterres Vilela |
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| Institution: | (1) Departmento de Geologia, Instituto de Geociências, Universidade Federal do Rio de Janeiro, Ilha do Fundão, 21949-900 Rio de Janeiro, RJ, Brazil |
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| Abstract: | The distribution of benthic foraminiferal microfauna recovered from two offshore transects on the Amazon shelf was studied. Eight box-core samples were collected along the inner, middle, and outer parts of the continental shelf. Each box-core sample was divided into 10 subsamples, of 1- to 5-cm intervals, in order to investigate the foraminiferal microhabitat preferences. The variations of salinity, oxygen, lithology, and sediment accumulation rates were used to evaluate ecological patterns. Four benthic foraminiferal assemblages identified in the study area characterize a record of oceanographic changes from early Holocene to the present. An abundant assemblage, with opportunistic species, was found near the river mouth. Two assemblages were identified northwest of the river mouth, with dominant epifaunal and infaunal species, respectively. A relict assemblage was encountered northwest of the river mouth. |
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