Revista de
Gestão Costeira
Integrada
Volume 16, Número 1, Março 2016, Páginas 89-94
DOI: 10.5894/rgci651
* Submission: 26 OCT 2015; Peer review: 29 NOV 2015; Revised:
11 JAN 2016; Accepted: 21 FEB 2016; Available on-line: 26 FEB 2016
Supporting
Information (1.249KB, PDF)
Holocene invertebrates from the Rocas Atoll:
A contribution for the ecological history of South Atlantic islands *
Marcelo de Oliveira Soares@, a, b; Cristiane Xerez Barrosoa; Ítalo Cesar Camelo Soares Limaa; Maria Marlúcia Freitas Santiagoc; Valesca Brasil Lemosd
@ - Corresponding author to whom correspondence should be addressed: Soares <bio_marcelo@yahoo.com.br>
a - Universidade Federal do Ceará (UFC), Instituto de Ciências do Mar
(LABOMAR), Av. Abolição, 3207, CEP 60165-081, Fortaleza, CE, Brazil.
b - Universitat Autònoma de Barcelona, Institut de Ciència i Tecnologia Ambientals (ICTA), Edifici Z, 081093, Barcelona, Spain.
c - Universidade Federal do Ceará (UFC), Departamento de Física, Av.Mister Hull, 60455-760, Fortaleza, CE, Brazil.
d - Universidade Federal do Rio Grande do Sul (UFRGS), Departamento de
Paleontologia e Estratigrafia, Av. Bento Gonçalves, 9500, CEP
91509-900, Proto Alegre-RS, Brasil.
ABSTRACTThe South Atlantic Ocean is the youngest of the
world’s oceans and one of the most important biodiversity hotspots;
however, there is a lack of scientific knowledge about its ecological
history. Here, we present the first results of a fossil invertebrate
survey from the Rocas Atoll. By using radiometric dating (14C) and a
survey of fossilized benthic invertebrates on this atoll, we provide
new paleobiogeographic and paleoceanographic information. The results
suggest eight taxa (five mollusks, two corals, and one decapod). Dates
ranged from 3449 ± 790 y BP to 3033 ± 620 y BP. The data represent new
invertebrate records for the middle Holocene in this atoll, and
evidence of sea-level changes in this period. Considering that the
Rocas Atoll is one of the newest marine atolls in the world, these
results suggest recent colonization by species from the Southwestern
Atlantic Coast and Fernando de Noronha Archipelago.
Keywords: Paleoceanography, Benthic communities, Paleobiogeography.
Avaliação da disponibilidade de metais em sedimentos do Canal
de Bertioga (Complexo Estuarino Santista – SP - Brasil): uma ferramenta
para o monitoramento da poluição química
RESUMO
O Atlântico Sul é o oceano mais recente e um dos
mais importantes hotspots de biodiversidade; entretanto, há uma lacuna
no conhecimento científico sobre sua história ecológica. Aqui, são
apresentados os primeiros resultados de um estudo sobre invertebrados
fósseis do Atol das Rocas. Utilizando datação radiométrica (14C) e
levantamento de invertebrados bentônicos fossilizados desse atol, são
fornecidas novas informações paleobiogegráficas e paleoceanográficas.
Os resultados mostram a ocorrência de oito táxons (cinco moluscos, dois
corais e um crustáceo decápoda), com datas variando de 3449 ± 790 a
3033 ± 620 anos antes do presente. Os dados revelam novos registros de
invertebrados para o Holoceno Médio nesse atol e novas evidências de
mudanças no nível do mar durante esse período. Considerando que o Atol
das Rocas é um dos mais recentes atóis do mundo, esses resultados
sugerem uma colonização recente por espécies advindas da costa do
Atlântico Sul Ocidental e do Arquipélago de Fernando de Noronha.
Palavras-chave: costa sudeste brasileira, elementos potencialmente tóxicos, extração sequencial, Risk Assessment Code (RAC).
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