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PALYNOLOGICAL EVIDENCE OF THE REPLACEMENT OF THE HYGROPHILOUS FOREST BY FIELD VEGETATION DURING THE LAST 7,000 YEARS B.P. IN THE NORTHERN COAST OF RIO DE JANEIRO, BRAZIL
Afiliación
Instituto de Botânica. Núcleo de Pesquisa em Palinologia. São Paulo, SP, Brasil / Universidade Federal do Rio de Janeiro, Instituto de Geociências. Departamento de Geologia. Laboratório de Palinologia. Rio de Janeiro, RJ, Brasil.
Universidade Federal do Rio de Janeiro, Instituto de Geociências. Departamento de Geologia. Laboratório de Palinologia. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Virologia. Laboratório de Ultra-estrutura Viral. Rio de Janeiro, RJ, Brasil.
Institut de Recherche pour le Développment. Centre IRD d’Ile de France. France.
Universidade Federal Fluminense. Instituto de Geociências. Laboratório de Geologia Marinha. Niterói, RJ, Brasil.
Institut de Recherche pour le Développment. Centre IRD d’Ile de France. France.
Universidade Federal do Rio de Janeiro, Instituto de Geociências. Departamento de Geologia. Laboratório de Palinologia. Rio de Janeiro, RJ, Brasil / Fundação Oswaldo Cruz. Instituto Oswaldo Cruz. Departamento de Virologia. Laboratório de Ultra-estrutura Viral. Rio de Janeiro, RJ, Brasil.
Institut de Recherche pour le Développment. Centre IRD d’Ile de France. France.
Universidade Federal Fluminense. Instituto de Geociências. Laboratório de Geologia Marinha. Niterói, RJ, Brasil.
Institut de Recherche pour le Développment. Centre IRD d’Ile de France. France.
Resumen en ingles
Historians claim that European colonizers of the northern coast of Rio de Janeiro State found vast herbaceous fields
when arrived in this region. Hypotheses about the origin of these fields include forest burning by the Goitacás
indians and periodical floods by the Paraíba do Sul River and the lagoon system. The palynologycal analysis of two
lake cores obtained in the municipality of Campos dos Goytacazes revealed opening episodes of hygrophilous forest
and the establishment of field vegetation, recorded at ca. 6,500 and ca. 4,000 14C yr BP. The partial replacement
of forest by field vegetation in the first episode was probably caused by floods of the lower areas during the development
of the Holocene lagoon phase. During the second episode, successions of vegetational patterns occurred due
to lowering of the sea level. Drying and enlarging of the coastal plain have allowed its colonization by herbs and
heliophyte plants. The palynological analysis does not provide any evidence that sustains the theories of use of fire
and agricultural activities by indigenous groups during these periods.
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