We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Modern pollen rain as a background for palaeoenvironmental studies in the Serra dos Carajás, southeastern Amazonia.
- Authors
Guimarães, José Tasso Felix; Rodrigues, Tarcísio Magevski; Santos Reis, Luiza; Costa de Figueiredo, Mariana Maha Jana; Fonseca da Silva, Delmo; Alves, Ronnie; Giannini, Tereza Cristina; Medeiros Carreira, Léa Maria; Rio Dias, Anna Christina; Freitas da Silva, Edilson; Sahoo, Prafulla Kumar; Sousa da Silva, Marcio; Martins Souza-Filho, Pedro Walfir
- Abstract
Several alternative interpretations of the pollen records of lake sediments in the Amazonia may arise due to a lack of understanding of the modern environments, mainly related to pollen-vegetation relationship. Therefore, in this work, we studied the modern pollen rain in sediments of the Amendoim Lake, plateaus of the Serra Sul dos Carajás, southeastern Amazonia. This study indicates the predominance of pollen grains from forest formation (ombrophilous forests and capão florestal) over montane savanna in the lake sediments, despite the fact that montane savanna occupies ~90% of the drainage basin. Additionally, these sediments reflect stronger signal of pollen from ombrophilous forests that occur in the slopes of the plateau. Important components of montane savanna such as Vellozia and Cereus were not observed in the modern pollen rain, which may be related to their shorter flowering periods restricted to the beginning of wetter conditions. The absence of Sacoglottis, Trichilia, Clusia, Emmotum, Guapira and Simarouba in the pollen rain is likely associated with different pollination strategy. The occurrence of windblown pollen of Alchornea, Pseudolmedia, Ilex and Cecropia, which are found from low to highlands of the Carajás region, reinforces a regional vegetation signal in sediments. Several plants from the studied site have been improperly described, according to taxonomy and ecology. For example, the current occurrence of Ilex and Styrax in the study site clearly suggests that they cannot be used as indicators of colder palaeoclimate conditions, as previously described. In addition, Poaceae can be found in drier to wetter substrate conditions, and abundance of their pollen grains in lakes can significantly vary according to relief morphology and cannot indicate palaeovegetation openness. Therefore, this work is a good background for further palaeobotany studies for this region.
- Subjects
CARAJAS Mountains (Brazil); AMAZON River Region; BRAZIL; PALEOBOTANY; POLLEN; PALEOENVIRONMENTAL studies; LAKE sediments; STYRAX
- Publication
Holocene, 2017, Vol 27, Issue 8, p1055
- ISSN
0959-6836
- Publication type
Article
- DOI
10.1177/0959683616683260