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Environmental impact on the dynamics of Lake Baikal phytoplankton taxonomic groups; modelling attempt

Environmental impact on the dynamics of Lake Baikal phytoplankton taxonomic groups; modelling attempt

Pages 200-213 2000

Lake Baikal phytoplankton community dynamics is simulated for modern conditions and for few hypothetical paleoclimate scenarios. A one-dimensional bio-optical model of pelagic ecosystems is used. The aim of the investigation is to simulate the influence of a few factors that have been proposed as possible reasons for full extinction of diatoms during cold climatic conditions. The effects of the silicon influx change, duration of the winter period, variability of the optical properties of ice, and glacier-generated suspended matter impact are studied. Diatom production is shown to be highly sensitive to the optical properties of ice and of the surface layer. The most probable reason for diatom extinction during cold climatic conditions is the optical impact of glacier-generated suspended matter and the variability of the optical properties of the ice cover.

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