Messie M. auteur aut IRD Petrenko A. auteur aut IRD Doglioli A. M. auteur aut IRD Aldebert C. auteur aut IRD Martinez Elodie auteur aut IRD Koenig G. auteur aut IRD Bonnet Sophie auteur aut IRD Moutin T. auteur aut IRD text journalArticle eng text/pdf born digital access In oligotrophic gyres of the tropical ocean, islands can enhance phytoplankton biomass and create hotspots of productivity and biodiversity. This "island mass effect" (IME) is typically identified by increased chlorophyll concentrations next to an island. Here we use a simple plankton model in a Lagrangian framework to represent an unexplained open ocean bloom, demonstrating how islands could have triggered it remotely. This new type of IME, termed "delayed IME," occurs when nitrate is limiting, N:P ratios are low, and excess phosphate and iron remain in water masses after an initial bloom associated with a "classical" IME. Nitrogen fixers then slowly utilize leftover phosphate and iron while water masses get advected away, resulting in a bloom decoupled in time (several weeks) and space (hundreds of kilometers) from island-driven nutrient supply. This study suggests that the fertilizing effect of islands on phytoplankton may have been largely underestimated. specialized island mass effect Lagrangian analysis nitrogen fixation nutrient supply oligotrophic ocean phytoplankton bloom TONGA 036 032 020 47 2 e2019GL085282 [10 p.] 2020 0094-8276 https://www.documentation.ird.fr/hor/fdi:010077955 10.1029/2019gl085282 0094-8276 [F B010077955] https://www.documentation.ird.fr/hor/fdi:010077955 https://www.documentation.ird.fr/intranet/publi/2020/03/010077955.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2020-05-18 2025-02-24 fdi:010077955 fre