INVESTIGADORES
VILANOVA Isabel
congresos y reuniones científicas
Título:
LAST MILLENNIAL ENVIRONMENTAL RECONSTRUCTION BASED ON A MULTI-PROXY RECORD FROM LAGUNA NASSAU, WESTERN PAMPAS, ARGENTINA
Autor/es:
ISABEL VILANOVA; KARSTEN SCHITTEK; MATHIAS GEILENKIRCHEN; FRANK SCHÄBITZ; WILFRIED SCHULZ
Lugar:
La Plata
Reunión:
Simposio; XVI Simposio Argentino de Paleobotánica y Palinología La; 2015
Institución organizadora:
Universidad Nacional de La Plata
Resumen:
We present a multi-proxy record (palynomorphs, charcoal, XRF) from Laguna Nassau (LN), located in the sandy lowlands of the Western Pampas of Argentina. This multi-proxy stacked record reveals the evolution of an incipient water body subjected to warm and dry conditions from ca. 900 to 770 calendar years before present (cal yr BP), fire occurrence and vegetation dominated locally by Typha; andregionally by the Espinal, represented by Celtis and psammophytic-halophtytic communities. After that, variable depths and unstable conditions occurred in the water body in relation to dry and humid phases until ca.200 cal yr BP, likely related to a transition to colder and/or wet climatic conditions. This water body evolved into a shallow lake since then, with a more stable and deeper water level, and regional vegetation characterized by the Espinal and psammophytic-halophytic communities mantling and stabilizing the nearby sand dunes. This evolution suggests complex hydrological responses of LN likely associated with its sensitivity to climatic variability. Comparisons with other records from the western and northeastern Pampas showed that, despite different levels of chronological resolution, the environmental, hydrological and climatic conditions were not uniform and included dry and wet phases with different timing at the regional scale. Nevertheless, we found that the climatic variations recorded at LN are more similar to those of Salinas del Bebedero, a playa lake located to the west of LN. In contrast, of the climate record of Laguna Mar Chiquita, located at the northeastern Pampas supports a different east-west hydrological regime in the Pampean Plain.