Andean Tectonics and Mantle Dynamics as a Pervasive Influence on Amazonian Ecosystem

Autor(es)

Bicudo, Tacio Cordeiro ^[1] ; Sacek, Victor ^[1] ; de Almeida, Renato Paes ^[2] ; Bates, John M. ^[3] ; Ribas, Camila Cherem ^[4]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Astron Geofis & Ciencias Atmosfer, Sao Paulo - Brazil

^[2] Univ Sao Paulo, Inst Geociencias, Sao Paulo - Brazil

^[3] Field Museum, Dept Zool, Chicago, IL - USA

^[4] Inst Nacl de Pesquisas da Amazonia, Manaus, Amazonas - Brazil

• Tipo de documento: Artigo Científico
• Fonte: SCIENTIFIC REPORTS; v. 9, NOV 14 2019.
• Citações Web of Science: 0

Resumo

The Amazonian landscape evolution is the result of the combined effect of Andean tectonism, climate and the Earth's interior dynamics. To reconstruct the landscape evolution and its influence on paleoenvironmental variations within Amazonia since the Oligocene, we conducted numerical experiments that incorporate different surface and geodynamic processes, reproducing many paleogeographic features as inferred from the sedimentary record. We show that the evolution of the drainage pattern gradually reduced the area of sedimentation derived from the Guiana and Brazilian shields while expanded the Andean derived deposits during the Miocene, affecting the nutrient availability. First order biotic habitats were inferred from these paleogeographical reconstructions, showing an eastward expansion of varzea and terra firme forests and consequent retraction of igapo forests, with a millennial-scale reconfiguration of a mosaic of habitats in the lowlands. We conclude that this dynamism probably guided the observed patterns of speciation in the most biodiverse biome on Earth. (AU)

• Processo FAPESP: 17/24870-5 - Evolução da bacia hidrográfica do Rio Amazonas: soerguimento dos Andes, clima e outros processos geodinâmicos
• Beneficiário: Victor Sacek
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 17/00461-9 - Desenvolvimento de eletrodos impressos modificados por azul da Prússia e análogos para dispositivos analíticos integrados
• Beneficiário: Juliano Alves Bonacin
• Modalidade de apoio: Bolsas no Exterior - Pesquisa