Horizon 1 1 5 OS CH : Chapitres d'ouvrages scientifiques Our shared ocean : science in the Global South for a sustainable world Grands Enjeux 82-83 SENEGAL 2025 Marseille IRD fdi:010094120 ENG https://www.documentation.ird.fr/hor/fdi:010094120 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/2025-07/010094120.pdf Horizon (IRD) Plankton accounts for 80% of ocean biomass. However, it is still relatively poorly understood and modelled. These gaps in understanding are problematic when it comes to projecting the evolution of marine ecosystems, as planktonic organisms are at the base of the entire food chain. 034BIOVEG ; 082ECOSYS