Análisis de la vegetación y del polen actual en la cuenca inferior del río Colorado, sudoeste de la provincia de Buenos Aires, Argentina: primeros resultados.

GRILL SILVIA C.; FERNÁNDEZ, A. L.

REVISTA BRASILEIRA DE PALEONTOLOGIA

SOC BRASILEIRA PALEONTOLOGIA

Lugar: Porto Alegre; Año: 2016 vol. 19 p. 111 - 126

1519-7530

ABSTRACT MODERN POLLEN AND VEGETATION IN THE LOW BASIN OF COLORADO RIVER, SOUTHWESTOF BUENOS AIRES PROVINCE, ARGENTINA. In order to determine modern analogues for fossil pollen sequencesassociated with archaeological sites in the lower Colorado river basin (southwest of Buenos Aires Province), the modernpollen-vegetation-climate relationships were evaluated. The study conducted through vegetation samples, pollen percentagediagrams and cluster analysis included surface samples, located at the northern and southern parts of the basin. Six plantcommunities: halophyte steppe, xerophytic woodland, grassland with xerophytic woodland elements, ruderal, halophiles/gramineous grassland and hydrophytic, were determined. The pollen spectrum was dominated by Chenopodiaceae, Asteraceae,Brassicaceae and Poaceae families. Most of the vegetation and pollen refl ected the local communities as part of the EspinalProvince (Calden District), recording a greater infl uence from the Pampean region (Pampas grassland-Espinal ecotone) undersub humid-dry weather at north of the basin, and greater infl uence with the Monte Province (Monte-Espinal ecotone), linkedto semi-arid climatic conditions to the south. Non-pollen microfossils (spores of fungi and algae) and taphonomic analysiscomplemented the study.Key words: modern pollen and vegetation, Colorado river basin, Buenos Aires, Argentina.