(Article of periodic en Anglais - 2012)

Document title

Holocenic proxies of sedimentary organic matter and the evolution of Lake Arari-Amazon Region

Authors(s) and Affiliation(s)

SMITH C.B. (1) ; COHEN M.C.L. (1 2) ; PESSENDA L.C.R. (3) ; FRANÇA M.C. (1) ; GUIMARÃES J.T.F. (1) ;
(1) Lab. of Coastal Dynamics, Federal Univ. of Pará, Belém, BRESIL
(2) Fac. of Oceanography, Federal Univ. of Pará, Belém, BRESIL
(3) Univ. of São Paulo, São Paulo, BRESIL


Four sediment cores were sampled from Lake Arari, located on Marajó Island at the mouth of the Amazon River in Northern Brazil. The island's vegetation cover is composed mainly of Amazon coastal forest, herbaceous and varzea vegetation. The integration of data on sedimentary structures, pollen, carbon and nitrogen isotope records, C/N ratios and radiocarbon ages allowed the identification of changes in vegetation and the sources of organic matter accumulated in the lake during the Holocene. This study identified an influence between marine and freshwater with 3 development stages of Lake Arari : presence of mangroves during the lagoon phase; then, the mangroves were replaced by herbaceous vegetation with the increase in freshwater river discharge; finally, Lake Arari was established in association with the expansion of herbaceous vegetation and the dominance of freshwater algae


Article of periodic

published at : Catena / ISSN 0341-8162

Editor : Catena, Cremlingen-Destedt - ALLEMAGNE (1973)

Millesime : 2012, vol. 90, no1 [pp. 26-38]

Bibliographic references : 2 p.

Collation : 8 fig., 3 tabl.



INIST-CNRS, Cote INIST : 16767

Digital Object Identifier

Go to electronic document thanks to its DOI : doi:10.1016/j.catena.2011.10.002

Tous droits réservés © Prodig - Bibliographie Géographique Internationale (BGI), 2012
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