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Abstract
Freshwater algae exhibit complex dynamics, particularly in meso-oligotrophic lakes with sudden and dramatic increases in algal biomass following long periods of low background concentration. This paper examines a massive *Uroglena* bloom in Lake Geneva, showing that a specific sequence of meteorological conditions triggered it: heavy rainfall increasing organic matter and nutrient loading, followed by wind-induced coastal upwelling, and a prolonged period of warm, calm weather. A multidisciplinary approach combining satellite remote sensing, in-situ measurements, biogeochemical analyses, and 3D modeling revealed the complex dynamics and the significant role of littoral-pelagic connectivity.
Publisher
Communications Earth & Environment
Published On
May 01, 2024
Authors
Abolfazl Irani Rahaghi, Daniel Odermatt, Orlane Anneville, Oscar Sepúlveda Steiner, Rafael Sebastian Reiss, Marina Amadori, Marco Toffolon, Stéphan Jacquet, Tristan Harmel, Mortimer Werther, Frédéric Soulignac, Etienne Dambrine, Didier Jézéquel, Christine Hatté, Viet Tran-Khac, Serena Rasconi, Frédéric Rimet, Damien Bouffard
Tags
freshwater algae
Uroglena bloom
Lake Geneva
meteorological conditions
littoral-pelagic connectivity
nutrient loading
coastal upwelling

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