EVOLUTION OF THE SEMIDECIDUOUS-RIPARIAN FOREST (ECOTONE CERRADO-ATLANTIC FOREST) DURING THE LATE HOLOCENE, SOUTHEAST OF BRAZIL

Autor(es)

Souza, Melina Mara ^[1] ; Ricardi-Branco, Fresia ^[2]

Afiliação do(s) autor(es)

^[1] Inst Educ Ciencia & Tecnol Minas, Ave Dirce Pereira Rosa 300, BR-37701100 Pocos De Caldas, MG - Brazil

^[2] Univ Estadual Campinas, Inst Geociencias, Dept Geol & Recursos Nat, Rua Carlos Gomes 250, BR-13083855 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Revista Brasileira de Paleontologia; v. 24, n. 2, p. 120-140, APR-JUN 2021.
• Citações Web of Science: 0

Resumo

The floodplains of meandering rivers in southeastern Brazil represent places where the sedimentary record associated with the history of transition/ecotone areas and exchange of biomes accumulates, such as the Cerrado (Cerradao Forest) and Atlantic Forest (Semideciduous-Riparian Forest). The present study aims to use palynological, isotopic (delta C-13, delta N-15 and C-14), and anthracological indicators in cores taken from three abandoned meander bends to make inferences about environmental evolution, vegetation reconstruction, and climatic inferences. The study area is located in the Mogi Guacu River Basin, in the countryside of Sao Paulo State. The studies show that similar to 2,730 BP (stage I), the area underwent through a more humid climatic phase compared to the current one, which allowed the expansion of the Riparian Semideciduous Forest. After that date, in stage II (1,800 to 510 BP), the percentage of the Cerrado (Cerradao Forest) increased, due to a drier period. From 510 BP to the present day (stage III), humidity has taken place with a new expansion of the Riparian Semideciduous Forest, although elements of Cerrado are present. Microscopic charcoal fragments were found in all stages and may infer the incidence of paleo-wildfires during the Late Holocene. The results indicate that both phytophysiognomies remained for the studied period, varying their expansion depending on the humidity present in each stage. Although lakes formed by abandoned meanders are not areas with the best palynological record, they are frequent environments in the interior of the continents. If properly interpreted, they may provide relevant information to vegetation and climatic changes for the areas. (AU)

• Processo FAPESP: 10/20379-6 - Análise paleoambiental quaternária do ecótono Cerrado/Mata Atlântica no município de Mogi-Guaçu, SP
• Beneficiário: Fresia Soledad Ricardi Torres Branco
• Modalidade de apoio: Auxílio à Pesquisa - Regular