Análise palinológica do Testemunho Cajuúna, planície costeira de Soure, Ilha do Marajó, Pará.

Abstract

This paper presents an analysis of palinomorfos (pollen and spores), contained in the sediments holocênicos testimony Cajuúna the Plain of Tide dE Soure, Island of Marajó, Pa. Have been identified and quantified, as a minimum, 300 grains of pollen per sub-sample, in addition to the spores and pollen exotic, resulting in 21 taxa. The reading of fluctuations of palinomorfos over the stratographic leveis in pollen diagrams, enabled the individualization of weather events as well as possible changes in plant composition of the area studied. The analysis palinológica was made in a testimony to the portion of 3.80 m above the plains of tide tide of Soure. That testimony was considered a portion of 2.06 m to the top of the witness. Four areas were identified pollen and there is a change and composition of palinomorfos along the sedimentary sequence, dated on the basis of 2.767 years ± 40 years A.P. And at the top, 564 years A.P. The dominance of the environment largely over ali testimony is recorded by the presence of pollen from Rhizophora, who presented abundance maximum of 95.33%. The change occurring in the hydrodynamic and hydrology, both regionally and locally, seem to have caused a reduction in the dominance of the pollen of Rhizophora type 1 and the increase of Rhizophora type 2, which was accompanied by an increase in the abundance of other kinds of pollen indicators environments restinga and the várzea. Through the analysis of sediments in the area were unable to meet the current deposition of palinomorfos and again the dominance of the largely evident. The Índices evaluated ecological changes through the analysis of richness, diversity and equitability. In order that registration guide aims to provide data for the information of the evolution of Holocene higher in the coastal zone of Paraense.