Late Quaternary vegetational and climate dynamics in southeastern Brazil, inferences from marine cores GeoB 3229-2 and GeoB 3202-1

This article presents a palynological study carried out on a sediment core from a peat deposit in Serra de Botucatu, in SÃo Paulo State, southeastern Brazilian Plateau. This region has been covered by grassland vegetation and forest patches throughout the recorded period. AMS radiocarbon dating plus palynological analysis of 27 samples from the sediment core allowed the recognition of several environmental changes that took place during the last 33,000 yr recorded in the core. The relationship between sedimentation rates and changes in the abundance of plants recognized through their pollen record, particularly a few important indicator species, provided the paleoenvironmental history for the Serra de Botucatu region, allowing the identification of changes in climate conditions and comparison with other regions in Brazil. One of the most remarkable features of this record is the cold and humid conditions during the Last Glacial Maximum, which diverges from previous interpretations for southeastern and southern Brazil but is in good agreement with paleoclimatic data from trace elements from cave stalagmites in SE Brazil. No indications of human impacts on the vegetation were found in this record.

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Checklist of sand dune vegetation on the tropical southeastern Brazil coast

Check List ◽

10.15560/13.2.2058 ◽

2017 ◽

Vol 13 (2) ◽

pp. 2058 ◽

Cited By ~ 2

Author(s):

Antonio Janilson Castelo ◽

João Marcelo Alvarenga Braga

Keyword(s):

Atlantic Forest ◽

Late Quaternary ◽

Sand Dunes ◽

Southeastern Brazil ◽

Dune Vegetation ◽

Quaternary Period ◽

Floristic Survey ◽

Marine Sand ◽

Late Quaternary Period ◽

Janeiro State

Restingas are mosaics of plant communities living on marine sand deposits of the late Quaternary period, located between the sea and the Atlantic Forest. This study presents the diversity of the vegetation of coastal sand dunes in the southeastern coast of Brazil. A floristic survey and bibliographic review of the nine restinga regions of Rio de Janeiro state was carried out, and information is presented about the habit, life form, dispersion syndrome, distribution, and biome occurrence of each species. Ninety-eight species were recorded, distributed among 81 genera and 38 families, of which the most diverse are Asteraceae (12 species), Poaceae (12 species), Fabaceae (11 species), and Rubiaceae (6 species). The majority of species have herbaceous habits and predominantly are camephyte-autochoric species. They present wide geographical distributions or are restricted to just some Brazilian states and are more similar to the Atlantic Forest biome.

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LATE QUATERNARY CHRONOLOGY OF COLLUVIAL AND PEDOGENIC PROCESSES IN THE MANTIQUEIRA HIGHLANDS, SOUTHEASTERN BRAZIL

10.1130/abs/2016am-281339 ◽

2016 ◽

Author(s):

Silvio Takashi Hiruma ◽

◽

Sheila Aparecida Correia Furquim ◽

Antonio Luiz Teixeira

Keyword(s):

Late Quaternary ◽

Southeastern Brazil ◽

Pedogenic Processes

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