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Volume 16, Issue 1 - March 2016

 

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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 <[email protected]>
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.


ABSTRACT
The 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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