APORTES DEL ANÁLISIS DE MACROFÓSILES VEGETALES A LA RECONSTRUCCIÓN PALEOAMBIENTAL EN RELACIÓN CON LOS REGISTROS POLÍNICOS DE TURBERAS DEL HOLOCENO, PATAGONIA ARGENTINA
DOI:
https://doi.org/10.5710/PEAPA.10.07.2018.250Abstract
Resumen. Las reconstrucciones del pasado se tornan más objetivas si se considera el mayor número de indicadores posible. En especial, las reconstrucciones ambientales de los últimos 20.000 años son importantes para el entendimiento de la dinámica de los sistemas naturales. Los macrofósiles vegetales tienen características que complementan el análisis polínico, permitiendo una mejor reconstrucción de la vegetación cuando se estudian en conjunto. El registro de macrofósiles acredita la llegada y la colonización local de los taxones durante el Holoceno, mientras que el registro de polen proporciona información a nivel regional. Esta información es valiosa en la reconstrucción de la vegetación local y en la determinación de los cambios en el límite de los bosques. Con el interés de realizar comparaciones directas entre el contenido de macrofósiles vegetales y de polen provenientes del mismo testigo, se analizaron tres secuencias de turbales del área del Lago Argentino previamente estudiadas. Esta integración permitió realizar una reconstrucción local y regional de los cambios en la vegetación y condiciones paleoambientales para los últimos 13.000 años cal. AP. Estos resultados ilustran como el análisis de macrofósiles vegetales (análisis taxonómicos, tafonómicos y estadísticos) en combinación con el análisis polínico proporciona un mejor entendimiento de la historia de la vegetación del área del Lago Argentino, sudoeste de Patagonia.
Palabras clave. Polen. Macrorrestos vegetales. Mallín. Lago Argentino. Cuaternario tardío.
Abstract. CONTRIBUTION OF PLANT MACROFOSSILS ANALYSIS TO THE PALEOECOLOGY RECONSTRUCTION IN RELATION TO POLLEN RECORDS FROM HOLOCENE PEATLAND SEQUENCES OF PATAGONIA, ARGENTINA. Reconstructions of the past become more objective when the largest number of possible indicators is used. Environmental reconstructions of the last 20,000 years are important to understand the dynamics of natural systems. Plant macrofossils have features that complement pollen analysis, adding new dimensions when studied in conjunction. Plant macrofossils credit the arrival and local colonization of taxa during the Holocene, while pollen records provide information at a regional level. This information is valuable in the reconstruction of local vegetation and in the determination of changes in the tree line. In order to compare plant macrofossil and pollen from the same core, three peatland sequences from Lago Argentino area previously studied were analyzed. This integration allowed a local and regional reconstruction of vegetation and paleoenvironmental conditions for the last 13,000 cal. yr BP. These results provide an example of how plant macrofossil analysis (taxonomic, taphonomic, and statistical analysis) in combination with pollen analysis results in a better understanding of the vegetation history of Lago Argentino area, southwest Patagonia.
Key words. Pollen. Plant macroremains. Mire. Lago Argentino. Late Quaternary.
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