Variations of richness and abundance of bathyal marine ostracods from the Campos Basin (Brazil) in response to climatic changes of the late Pleistocene

Benthic marine ostracods are important paleoenvironmental indicators due to their sensitivity to ecological parameters, which are particularly useful in palaeoclimatic and paleoceanographic reconstructions during the Quaternary. The preliminary study of ostracods from 61 samples of a piston core col...

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Detalles Bibliográficos
Autores principales: Villar de Queiroz Neto, João, Sousa, Ariany de Jesus e, Tokutake, Lucio Riogi, Nicolaidis, Demétrio Dias, Bergue, Cristianini Trescastro
Formato: Objeto de conferencia Resumen
Lenguaje:Inglés
Publicado: 2010
Materias:
Ciencias Naturales
Paleontología
Bathyal marine ostracods
Campos Basin (Brazil)
Climatic changes
Late Pleistocene
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/16704
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-16704
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Naturales
Paleontología
Bathyal marine ostracods
Campos Basin (Brazil)
Climatic changes
Late Pleistocene
spellingShingle Ciencias Naturales
Paleontología
Bathyal marine ostracods
Campos Basin (Brazil)
Climatic changes
Late Pleistocene
Villar de Queiroz Neto, João
Sousa, Ariany de Jesus e
Tokutake, Lucio Riogi
Nicolaidis, Demétrio Dias
Bergue, Cristianini Trescastro
Variations of richness and abundance of bathyal marine ostracods from the Campos Basin (Brazil) in response to climatic changes of the late Pleistocene
topic_facet Ciencias Naturales
Paleontología
Bathyal marine ostracods
Campos Basin (Brazil)
Climatic changes
Late Pleistocene
description Benthic marine ostracods are important paleoenvironmental indicators due to their sensitivity to ecological parameters, which are particularly useful in palaeoclimatic and paleoceanographic reconstructions during the Quaternary. The preliminary study of ostracods from 61 samples of a piston core collected from 1503m depth on the continental margin of southeastern Brazil (Campos Basin) showed the existence of a rich but irregularly distributed ostracod fauna. The levels of abundance, here named as events, were numbered from 1 to 6 (E1-E6) and calibrated according to the zones of planktonic foraminifera (W, X, Y). These events that distinguish different associations of planktonic foraminifera are considered as indicative of water temperature fluctuations (from cold to hot), and/or as variation of the sediment content (from marl to carbonate mud). These events show a positive correlation with the isotopic signals of δ<sup>18</sup>O and δ<sup>13</sup>C. E1 and E5 events are controlled by lithology, E2-E4 by the temperature surface water, and finally, E-6 is subject to both, lithology and climate. In the intervals of greatest marine ostracod abundance, variations in the degree of calcification and evidence of predation were observed. The taxonomic studies have identified 128 species belonging to 40 genera, mostly recorded in glacial stages. Australoecia atlantica Maddocks, Henryhowella melobesioides (Brady), Poseidonamicus pintoi Benson, Argilloecia spp., Krithe spp. and Bythocypris spp. are the most abundant taxa.
format Objeto de conferencia
Resumen
author Villar de Queiroz Neto, João
Sousa, Ariany de Jesus e
Tokutake, Lucio Riogi
Nicolaidis, Demétrio Dias
Bergue, Cristianini Trescastro
author_facet Villar de Queiroz Neto, João
Sousa, Ariany de Jesus e
Tokutake, Lucio Riogi
Nicolaidis, Demétrio Dias
Bergue, Cristianini Trescastro
author_sort Villar de Queiroz Neto, João
title Variations of richness and abundance of bathyal marine ostracods from the Campos Basin (Brazil) in response to climatic changes of the late Pleistocene
title_short Variations of richness and abundance of bathyal marine ostracods from the Campos Basin (Brazil) in response to climatic changes of the late Pleistocene
title_full Variations of richness and abundance of bathyal marine ostracods from the Campos Basin (Brazil) in response to climatic changes of the late Pleistocene
title_fullStr Variations of richness and abundance of bathyal marine ostracods from the Campos Basin (Brazil) in response to climatic changes of the late Pleistocene
title_full_unstemmed Variations of richness and abundance of bathyal marine ostracods from the Campos Basin (Brazil) in response to climatic changes of the late Pleistocene
title_sort variations of richness and abundance of bathyal marine ostracods from the campos basin (brazil) in response to climatic changes of the late pleistocene
publishDate 2010
url http://sedici.unlp.edu.ar/handle/10915/16704
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