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| Content Provider | Springer Nature Link |
|---|---|
| Author | Guimarães, José Tasso Felix Cohen, Marcelo Cancela Lisboa França, Marlon Carlos Alves, Igor Charles Castor Smith, Clarisse Beltrão Pessenda, Luiz Carlos Ruiz Behling, Hermann |
| Copyright Year | 2012 |
| Abstract | The geomorphological analysis of the river Tocantins alluvial area was carried out by remote sensing techniques, jointly with studies of sedimentary facies, mineralogy and geochemistry, pollen and spores, C and N isotopes data and radiocarbon dating of a sediment core from a floodplain lake, near the river Tocantins in the southeastern Amazon region. The aim was to identify and discuss the relationship between the main geomorphological processes and climatic factors, as well as their influence on vegetation patterns. The data indicate three phases of sediment and organic matter accumulation associated with vegetation changes during the Holocene: in Phase 1 (>7760 ± 80 cal yrs b.p.), the channel was gradually being disconnected from its main course, accumulating organic matter from terrestrial woody plants; in Phase 2 (>7760 ± 80 to 5145 ± 175 cal yrs b.p.), the very low energy flows allowed the deposition of autochthonous organic mud from suspension. Herbaceous vegetation and a Mauritia palm-swamp dominated the study area, followed by an increase in the contribution of freshwater dissolved organic carbon (DOC) to the lake; Phase 3 (5145 ± 175 cal yrs b.p. until present) records the expansion of ferns and arboreal plants, and greater freshwater organic matter input into the lake with anoxic water conditions. The development of the studied lake occurred by geomorphological changes and the filling process of an abandoned channel according to hydrodynamics and vegetation changes which were probably influenced by climatic changes during the Holocene. |
| Starting Page | 185 |
| Ending Page | 198 |
| Page Count | 14 |
| File Format | |
| ISSN | 09396314 |
| Journal | Vegetation History and Archaeobotany |
| Volume Number | 22 |
| Issue Number | 3 |
| e-ISSN | 16176278 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2012-09-12 |
| Publisher Place | Berlin, Heidelberg |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Holocene Palynology Amazon rain forest Wetland development Sedimentary facies Siliciclastic and organic matter sources Paleontology Biogeosciences Climate Change Anthropology Archaeology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Plant Science Archeology (arts and humanities) Paleontology |
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