SS3.09 Climate-Lake Interactions
Date: Wednesday, June 12, 2002
Time: 9:30:00 AM
Location: Colwood
 
CatalanJ, CEAB-CSIC and University of Barcelona, Blanes, Spain, catalan@ceab.csic.es
 
TEMPORAL SCALING OF PRIMARY PRODUCTION PROCESSES IN LAKES AND THE LIKELIHOOD OF ALGAL PROXY RECORDS CLIMATIC FLUCTUATIONS IN LAKE SEDIMENTS
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The use of algal proxies (diatoms, chrysophyte cysts, pigments, lipid markers) in palaeolimnological reconstructions of climate is increasing significantly. However, the information held in these records is probably significantly richer than most simple reconstructions imply. Climatic factors may impact on components of algal dynamics that significantly differ in their characteristic time scale of response. As a consequence, the sensitivity of algal fluctuations to climate and the likelihood for these dynamics to be recorded in a given lake may vary significantly. Algae directly respond to their proximal environmental factors (light, nutrients, carbon and temperature among others). However; how fluctuations in these factors scale-up in time, and as a consequence the algal response, depends on the relationship between these proximal factors and landscape environmental factors, such as lake morphology, catchment characteristics, geographical position, and the nature of the climatic forcing. This presentation aims to review how different climatic fluctuations may propagate through the cascade of processes involved and how it may be eventually reflected in the sediment.