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Historical vegetation shifts in southeastern Amazonia: Unraveling ecotone dynamics in the Carajás region over the last ∼14000 cal yr BP

Authors :
da Silva, Karen Lopes
Reis, Luiza Santos
Sahoo, Prafulla Kumar
Gastauer, Markus
Silva Júnior, Renato Oliveira da
Melo, Adayana Maria Queiroz de
Leite, Alessandro Sabá
Salomão, Gabriel Negreiro
Romeiro, Luiza Araújo
Rodrigues, Tarcísio Magevski
Silva, Edilson Freitas da
Figueiredo, Mariana Maha Jana Costa
Guimarães, José Tasso Felix
Source :
Quaternary Science Advances; December 2024, Vol. 16 Issue: 1
Publication Year :
2024

Abstract

This study investigates the Pleistocene–Holocene transition in Serra Leste, a highly endangered southeastern Amazonian ecotone, with a focus on the lake-filling process, climate changes, and potential consequences to forest and savanna dynamics. The lake's development began at approximately 14000 cal yr BP, resulting from the collapse of the fractured lateritic crust. Sedimentation patterns and geochemical, palynological and micro-charcoal proxies reveal shifts in detrital input and redox conditions, forest/savanna areas, and local and regional fire events, indicating a highly dynamic environmental history. The evolution of the lake is characterized by initial deltaic lobe deposition and forest dominance, followed in the Middle Holocene by sedimentary gaps or reduced detrital input; woody vegetation dominance, with a notable shift toward a more open landscape; and savanna and semideciduous dry forest, accompanied by a decrease in ombrophilous forests. A resurgence in arboreal elements recorded in the Late Holocene indicates an expansion of ombrophilous forests under wetter climate conditions and the establishment of a more continuous forest matrix, with the presence of likely “hyperdominant” taxa. Frequent local fire events and the occurrence of temporarily correlated archeological sites in the Serra Leste region suggest the influence of ancient indigenous communities on vegetation changes during the Late Holocene.

Details

Language :
English
ISSN :
26660334
Volume :
16
Issue :
1
Database :
Supplemental Index
Journal :
Quaternary Science Advances
Publication Type :
Periodical
Accession number :
ejs67494067
Full Text :
https://doi.org/10.1016/j.qsa.2024.100245