Abstract
This paper presents the results of a qualitative palynological analysis of a 140 cm-thick section of Holocene sediments from a paleolagoon, representing the last 2600 years, taken from an outcrop at Hermenegildo Beach (33o42'S; 53o18'W), located in the municipality of Santa Vitoria do Palmar, in the state of Rio Grande do Sul, Brazil. Samples were treated with hydrochloric acid, hydrofluoric acid and potassium hydroxide, after which they were subjected to acetolysis and mounted on glycerin-coated slides for light microscopy analysis. Among the 48 palynomorphs identified were 25 fungi, eight algae, three bryophytes, and 12 pteridophytes. Brief descriptions and illustrations of each palynomorph are presented, together with ecological data from the organism of origin when possible. Our findings will serve as reference material for paleoenvironmental studies in the coastal plain of southern Brazil.
Highlights
Little is known about sea-level oscillations and their effects on climate and vegetation dynamics in the southern coastal plain in the state of Rio Grande do Sul, Brazil, despite the contribution that such oscillations have made to shaping the current landscape of the region
Few palynomorph descriptions exist for use in paleoenvironmental studies of the > 600 km-long coastal plain of Rio Grande do Sul, the southernmost Brazilian state (Lorscheitter 1988, 1989; Neves & Lorscheitter 1992, 1995a; Neves & Bauermann 2003, 2004; Roth & Lorscheitter 2013), and there are no palynological references for the extreme southern portion of the region
The purpose of the present study was to document the palynology of coastal plain sediments from the extreme south of Rio Grande do Sul, representing the last 2600 years, as reference material for paleoenvironmental research
Summary
Little is known about sea-level oscillations and their effects on climate and vegetation dynamics in the southern coastal plain in the state of Rio Grande do Sul, Brazil, despite the contribution that such oscillations have made to shaping the current landscape of the region. Few palynomorph descriptions exist for use in paleoenvironmental studies of the > 600 km-long coastal plain of Rio Grande do Sul, the southernmost Brazilian state (Lorscheitter 1988, 1989; Neves & Lorscheitter 1992, 1995a; Neves & Bauermann 2003, 2004; Roth & Lorscheitter 2013), and there are no palynological references for the extreme southern portion of the region. The purpose of the present study was to document the palynology of coastal plain sediments from the extreme south of Rio Grande do Sul, representing the last 2600 years, as reference material for paleoenvironmental research. We provide taxonomic descriptions and photomicrographs, as well as ecological information about the organism of origin when possible
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