Effects of the middle Holocene high sea-level stand and climate on Amazonian mangroves

Autor(es)

Cohen, Marcelo C. L. ^[1] ; Pinto Camargo, Paloma Maria ^[1] ; Pessenda, Luiz C. R. ^[2] ; Lorente, Flavio Lima ^[2] ; De Souza, V, Adriana ; Martins Correa, Jose Augusto ^[3] ; Bendassolli, Jose ^[4] ; Dietz, Marianne ^[5]

Afiliação do(s) autor(es)

^[1] Fed Univ Para, Grad Program Geol & Geochem, Belem, Para - Brazil

^[2] Univ Sao Paulo, CENA 14C Lab, Sao Paulo - Brazil

^[3] De Souza, Adriana, V, Fed Univ Para, Grad Program Geol & Geochem, Belem, Para - Brazil

^[4] Univ Sao Paulo, CENA Stable Isotopes Lab, Sao Paulo - Brazil

^[5] Louisiana State Univ, Dept Oceanog & Coastal Sci, Baton Rouge, LA 70803 - USA

• Tipo de documento: Artigo Científico
• Fonte: JOURNAL OF QUATERNARY SCIENCE; v. 36, n. 6, p. 1013-1027, AUG 2021.
• Citações Web of Science: 1

Resumo

The high sea-level stand during the mid-Holocene is a benchmark in mangrove dynamics along the north-east/south-east coast of Brazil and provides a reference point for landward and seaward mangrove migrations corresponding to changes in relative sea level (RSL). However, evidence of the impacts associated with RSL fall on the northern Brazilian coast is scarce. Multi-proxy data from the highest tidal flats of the Braganca Peninsula in northern Brazil revealed modern herbaceous areas were occupied by mangroves Rhizophora and Avicennia from similar to 6250 to similar to 5850 cal a BP, and only Avicennia between similar to 5850 and similar to 5000 cal a BP. The same tidal flats were vegetation-free between similar to 5000 and similar to 4300 cal a BP. A combination of a high sea-level stand (0.6 +/- 0.1 m) at similar to 5000 cal a BP and a dry early-middle Holocene in the Amazon probably caused an increase in porewater salinity of tidal flats, which resulted in a mangrove succession from Rhizophora to Avicennia dominance. RSL fall accentuated this process, contributing to mangrove degradation between similar to 5000 and similar to 4300 cal a bP. RSL fall, and a wetter period over the past similar to 4300 cal a BP caused a mangrove migration from highest to lowest flats, followed by expansion of herbaceous vegetation on the highest flats. Copyright (C) 2021 John Wiley \& Sons, Ltd. (AU)

• Processo FAPESP: 20/13715-1 - Dinâmica dos manguezais americanos nos limites austral e boreal em escalas secular e decadal
• Beneficiário: Luiz Carlos Ruiz Pessenda
• Modalidade de apoio: Auxílio à Pesquisa - Regular