SS3.09 Climate-Lake Interactions
Date: Wednesday, June 12, 2002
Time: 11:00:00 AM
Location: Colwood
 
PLA-RABESS, UCL, Environmental Change Research Centre, London, United Kingdom, s.pla@geog.ucl.ac.uk
Felip, M, , University of Barcelona Dep. Ecology, Barcelona, Spain, marisol@bio.ub.es
Buchaca, T, , University of Barcelona Dep. Ecology, Barcelona, Spain, buch@bio.ub.es
Ventura, M, , University of Barcelona Dep. Ecology, Barcelona, Spain, ventura@bio.ub.es
Camarero, L, , Centre for Advanced Studies, CSIC, Blanes, Spain, camarero@bio.ub.es
Catalan, J, , Centre for Advanced Studies, CSIC, Blanes, Spain, catalan@ceab.csic.es
 
INTERDECADAL VARIABILITY OF SEASONAL CLIMATE INFERRED BY ALGAL REMAINS
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In recent years palaeolimnology has increased its applications, one of them being the reconstruction of past climate. However, more effort is required to understand the ecological influence of climate seasonality. Algal populations usually present marked seasonal patterns in lakes, and their remains in sediments therefore have great potential as proxies for the reconstruction of seasonal features of climate. The algal response to fluctuations in air temperature during the last two centuries was investigate in Lake Redon (Pyrenees), by comparison between air temperature retrodictions of instrumental data and the sediment record. The seasonal signal was further studied using data from monthly emptied sediment traps deployed during a year. Chrysophytes cysts community composition is best correlated with summer and autumn temperatures, probably reflects the effect on lake thermal structure. However, the timing of ice melt appears to be a key factor in determining the seasonal periodicity of chrysophyte cysts. Our results confirm the potential of algal remains for the reconstruction of annual seasonality from sediment records, and further development may allow their application to Holocene reconstructions.