| Full text | |
| Author(s): |
Rodrigues, Fernanda C. G.
;
Ribas, Camila C.
;
Pupim, Fabiano N.
;
Porat, Naomi
;
Akabane, Thomas K.
;
Vicentini, Alberto
;
Sawakuchi, Andre O.
Total Authors: 7
|
| Document type: | Journal article |
| Source: | SCIENTIFIC REPORTS; v. 14, n. 1, p. 19-pg., 2024-10-01. |
| Abstract | |
Understanding the role of open vegetation, particularly in white-sand ecosystems (WSE) and savannas, is crucial for elucidating their role in Amazonian biotic diversification. These ecosystems predominantly develop on sandy terrains, suggesting that the geological substrate significantly influences the vegetation upon it. Therefore, the interaction between landscape changes and biotic diversification is closely tied to the dynamics and resilience of these sandy substrates. Current WSE and savannas in lowland Amazonia colonized fluvial sediments deposited during the past 120 ka, with marked synchronicity over the last 23 ka, as shown by optically stimulated luminescence (OSL) and radiocarbon ages of such sandy substrates. In contrast, sandy substrates supporting open vegetation in highland areas, unsuitable for Quaternary sand accumulation, would have persisted beyond the Quaternary, as ancient sedimentary rocks in these areas are prone to developing sandy soils. The current distribution of open vegetation ecosystems in lowland Amazonia is coupled with the deposition and erosion of sandy sediments by Quaternary fluvial systems, while weathering sandy substrates in highland areas serve as long-term and resilient refugia beyond the Quaternary. The contrasting spatiotemporal dynamics of landscape changes in lowland and highland areas has implications for biodiversification or extinction events leading to current biogeography patterns in Amazonia. (AU) | |
| FAPESP's process: | 16/02656-9 - The response of sedimentary dynamics of the Xingu and Tapajós rivers to climate changes and hydropower dams: risks for biodiversity conservation and energy production in Amazonia |
| Grantee: | André Oliveira Sawakuchi |
| Support Opportunities: | Research Program on Global Climate Change - Regular Grants |
| FAPESP's process: | 21/13129-8 - Late Quaternary fire regime in tropical South America |
| Grantee: | Thomas Kenji Akabane |
| Support Opportunities: | Scholarships abroad - Research Internship - Doctorate |
| FAPESP's process: | 09/53988-8 - Acquisition of a luminescence dating system and a precision microsampler for the study of environmental changes in the Quaternary period |
| Grantee: | Paulo César Fonseca Giannini |
| Support Opportunities: | Multi-user Equipment Program |
| FAPESP's process: | 18/12472-8 - Origin and chronology of sandy substrates in Amazonia: implications for quaternary evolution of open vegetation ecosystems |
| Grantee: | Fernanda Costa Gonçalves Rodrigues |
| Support Opportunities: | Scholarships in Brazil - Doctorate |
| FAPESP's process: | 18/23899-2 - Trans-Amazon Drilling Project: origin and evolution of the forests, climate, and hydrology of the South American tropics |
| Grantee: | André Oliveira Sawakuchi |
| Support Opportunities: | Research Program on Global Climate Change - Thematic Grants |
| FAPESP's process: | 18/15123-4 - Past perspectives on tipping elements of the climate system: the Amazon Rainforest and the Atlantic Meridional Overturning Circulation (PPTEAM) |
| Grantee: | Cristiano Mazur Chiessi |
| Support Opportunities: | Research Grants - Research Program on Global Climate Change - Young Investigators - Phase 2 |
| FAPESP's process: | 22/05520-1 - Climate and sedimentary dynamics of Amazonian floodplains during the Quaternary and its role on biotic diversification |
| Grantee: | Fernanda Costa Gonçalves Rodrigues |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 19/19948-0 - Influence of Late Pleistocene climate changes on the Amazon vegetation |
| Grantee: | Thomas Kenji Akabane |
| Support Opportunities: | Scholarships in Brazil - Doctorate |