Use este identificador para citar ou linkar para este item: https://repositorio.inpa.gov.br/handle/1/16699
Título: Chronology of Terra Firme formation in Amazonian lowlands reveals a dynamic Quaternary landscape
Autor: Pupim, F. N.
Sawakuchi, André Oliveira
Almeida, Renato Paes de
Ribas, Camila Cherem
Kern, Andrea K.
Hartmann, Gelvam A.
Chiessi, Cristiano Mazur
Tamura, Larissa Natsumi
Mineli, Thays Desiree
Savian, Jairo Francisco
Grohmann, Carlos Henrique
Bertassoli, D. J.
Stern, A. G.
Cruz, Francisco W.
Cracraft, Joel L.
Palavras-chave: Biodiversity
Ecosystems
Forestry
Geochronology
Geomorphology
Luminescence
Population Distribution
Amazon River
Amazonia
Fluvial Evolution
Paleogeography
Quaternary Geochronologies
Floods
Biodiversity
Biogeographical Region
Chronology
Dating Method
Dispersal
Geochronology
Habitat Availability
Landscape
Landscape Change
Luminescence
Magnetostratigraphy
Paleogeography
Pleistocene
Population Distribution
Quaternary
Species Diversity
Wetland
Amazon River
Amazonia
Data do documento: 2019
Revista: Quaternary Science Reviews
É parte de: Volume 210, Pags. 154-163
Abstract: In the Amazonian lowlands, the shift from a large wetland dominated by flooded forests (Várzea) to the modern incised valleys bounded by extensive areas of non-flooded forests (Terra Firme) is considered a key driver of the Amazonian mega-biodiversity. Dating the sedimentary beds covered by Terra Firme forest is crucial to constrain the timing of such landscape change. Here we determined the formation ages of widespread regions of Terra Firme substrates in central Amazonian lowlands combining optically stimulated luminescence (OSL) dating, magnetostratigraphy and palinostratigraphy. Our data suggest a very dynamic fluvial system leading to a recent expansion of Terra Firme forests and retraction of Várzea forests during the late Pleistocene. The shift from an extensively flooded to non-flooded surface resulted from river incision around 45-35 ka, which potentially influenced the distribution of taxa by expanding available habitat, creating new barriers to dispersal, or changing the permeability of previous barriers. Transitions between flooded and non-flooded landscapes may have driven diversification and caused changes to species distributions, contributing to the high species diversity and biogeographic patterns currently found in the region. The late Quaternary evolution of Terra Firme substrates reveals that physical landscape changes play a major role in shaping biotic habitats even in the 10 4 –10 5 years time-scales. © 2019 Elsevier Ltd
DOI: 10.1016/j.quascirev.2019.03.008
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