| Journal: | Anais da Academia Brasileira de Ciencias |
| Database: | PERIÓDICA |
| System number: | 000436333 |
| ISSN: | 0001-3765 |
| Authors: | Rossetti, Dilce F1 Moulatlet, Gabriel M2 Tuomisto, Hanna3 Gribel, Rogério4 Toledo, Peter M1 Valeriano, Márcio M1 Ruokolainen, Kalle5 Cohen, Marcelo C.L6 Cordeiro, Carlos L.O1 Rennó, Camilo D1 Coelho, Luiz S4 Ferreira, Carlos A.C4 |
| Institutions: | 1Instituto Nacional de Pesquisas Espaciais, Coordenacao Geral de Observacao da Terra, Sao Jose dos Campos, Sao Paulo. Brasil 2Universidad Regional Amazónica IKIAM, Tena, Napo. Ecuador 3University of Turku, Turku, Turun-Porin. Finlandia 4Instituto Nacional de Pesquisas da Amazonia, Coordenacao de Biodiversidade, Manaus, Amazonas. Brasil 5University of Turku, Department of Geography and Geology, Turku, Turun-Porin. Finlandia 6Universidade Federal do Para, Programa de Pos-Graduacao em Geologia e Geoquimica, Belem, Para. Brasil |
| Year: | 2019 |
| Volumen: | 91 |
| Number: | 4 |
| Country: | Brasil |
| Language: | Inglés |
| Document type: | Artículo |
| Approach: | Analítico, descriptivo |
| English abstract | What controls the formation of patchy substrates of white sand vegetation in the Amazonian lowlands is still unclear. This research integrated the geological history and plant inventories of a white sand vegetation patch confined to one large fan-shaped sandy substrate of northern Amazonia, which is related to a megafan environment. We examined floristic patterns to determine whether abundant species are more often generalists than the rarer one, by comparing the megafan environments and older basement rocks. We also investigated the pattern of species accumulation as a function of increasing sampling effort. All plant groups recorded a high proportion of generalist species on the megafan sediments compared to older basement rocks. The vegetation structure is controlled by topographic gradients resulting from the smooth slope of the megafan morphology and microreliefs imposed by various megafan subenvironments. Late Pleistocene-Holocene environmental disturbances caused by megafan sedimentary processes controlled the distribution of white sand vegetation over a large area of the Amazonian lowlands, and may have also been an important factor in species diversification during this period. The integration of geological and biological data may shed new light on the existence of many patches of white sand vegetation from the plains of northern Amazonia |
| Disciplines: | Geociencias, Geografía |
| Keyword: | Geografía física, Geología, Humedales, Historia geológica, Pleistoceno-Holoceno, Dinámica sedimentaria, Vegetación, Amazonas |
| Keyword: | Physical geography, Geology, Amazon, Wetlands, Geological history, Pleistocene-Holocene, Sedimentary dynamics, Vegetation |
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