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Vegetation changes and hydrological fluctuations in the Central Ebro Basin (NE Spain) since the Late Glacial period: Saline lake records

AutorGonzález-Sampériz, Penélope ; Valero-Garcés, Blas L. ; Moreno Caballud, Ana ; Morellón, Mario ; Navas Izquierdo, Ana ; Machín Gayarre, Javier ; Delgado Huertas, Antonio
Palabras clavePlaya-lake systems
Palaeohydrological fluctuations
Vegetation cover
Fecha de publicaciónmar-2008
CitaciónPalaeoecology, Volume 259, Issues 2-3, 24 March 2008, Pages 157-181.
ResumenAlthough the Central Ebro Basin (Northeastern Iberian Peninsula) is both the northernmost semi-arid area in Europe and one of the regions with the largest biodiversity, it has been insufficiently studied in terms of past climate variability due to the scarcity of suitable sites for palaeoenvironmental analyses. Previous studies from ephemeral saline lakes in the area, mainly based on palynological data, show abrupt and rapid arid/humid transitions throughout the last glacial cycle highlighting a complex palaeohydrological evolution. New cores from two saline lakes (La Playa and La Salineta) in the Los Monegros area provide multi-proxy records including sedimentology, geochemistry, and pollen indicators. This study, together with a detailed and comprehensive review of the main saline records from the Central Ebro Basin, enables us tos reconstruct a comprehensive picture of the palaeoclimate evolution during the last glacial cycle. One of the main results of this study is the alternation of humid and dry phases as a characteristic of the climate evolution during the Lateglacial. Additionally, the study suggests an important role of the increased flow from the Pyrenean rivers during deglaciation in the hydrological balance of the Central Ebro Basin. It is found that the Early Holocene is the wettest period over the sequence studied contrasting with the arid Middle Holocene interval, which is frequently absent as a result of intense aeolian erosive processes. Although anthropogenic activity partially masks the climate signal from the palynological data in the uppermost part of the sequences studied, there are some sedimentological evidences for a climate change during the last 2000 years resulting in a recovery of average saline lake levels in the Central Ebro Basin.
DescripciónThe final version is available at: http://www.sciencedirect.com/science/journal/00310182
Versión del editorhttp://dx.doi.org/10.1016/j.palaeo.2007.10.005
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