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Acta Botanica Brasilica

Print version ISSN 0102-3306On-line version ISSN 1677-941X

Abstract

FONSECA-SILVA, Fernanda Mara; CARVALHO, Marcelo de Araujo  and  RIBEIRO, Sérvio Pontes. Palynological evidence of vegetation change during the last 10,000 years in the mid-valley of the Rio Doce, Brazil. Acta Bot. Bras. [online]. 2019, vol.33, n.1, pp.29-38.  Epub Nov 29, 2018. ISSN 0102-3306.  http://dx.doi.org/10.1590/0102-33062018abb0128.

In order to reconstruct the vegetation history of the last 10.000 years, palynological analyses were carried out using 17 sedimentary samples of a core drilled in Parque Estadual do Rio Doce (PERD-MG). Twenty-one species of fern spores, 52 species of pollen grains and six species of fungi were identified. Phase 1 (10.375 - 9.350 cal. years BP) is characterized by a low concentration and diversity of pollen grains and is thus interpreted as a fluvial system with the presence of coarse-grained sediments. Phase 2 (9.062 - 8.195 cal. Years BP) is interpreted as a transition from a fluvial to lacustrine environment. Phase 3 (7.905 - 4.785 cal years BP) is characterized by increased trend of palynomorph concentration, highlighted by a high abundance and diversity of fern spores, which are indicative of a more a humid condition. The uppermost phase, Phase 4 (4.785 - 50 cal. Years AP), possessed a lower abundance of herbaceous flora, which is replaced by other vegetation groups (e.g. marsh, cerrado, Atlantic Forest). The uppermost sample represents the contemporary environment (~50 years), which is characterized as seasonally-flooded.

Keywords : Holocene; paleovegetation; Parque Estadual do Rio Doce (PERD); pollen analysis; South America.

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