Trichodesmium, a globally important, N2-fixing, and colony-forming cyanobacterium, employs multiple pathways for acquiring nutrients from air-borne dust, including active dust collection. Once concentrated within the colony core, dust can supply Trichodesmium with nutrients. Recently, we reported a selectivity in particle collection enabling Trichodesmium to center iron-rich minerals and optimize its nutrient utilization. In this follow-up study we examined if colonies select Phosphorus (P) minerals. We incubated 1,200 Trichodesmium colonies from the Red Sea with P-free CaCO3, P-coated CaCO3, and dust, over an entire bloom season. These colonies preferably interacted, centered, and retained P-coated CaCO3 compared with P-free CaCO3. In both studies, Trichodesmium clearly favored dust over all other particles tested, whereas nutrient-free particles were barely collected or retained, indicating that the colonies sense the particle composition and preferably collect nutrient-rich particles. This unique ability contributes to Trichodesmium's current ecological success and may assist it to flourish in future warmer oceans.

Israel Limnology and Oceanography Research Haifa Israel

Laboratory of Photosynthesis Center Algatech Institute of Microbiology of the Czech Academy of Sciences Třeboň Czech Republic

State Key Laboratory of Marine Environmental Science Xiamen University Xiamen Fujian People's Republic of China

The Freddy and Nadine Herrmann Institute of Earth Sciences Edmond J Safra Campus Givat Ram Hebrew University of Jerusalem Jerusalem Israel

The Interuniversity Institute for Marine Sciences in Eilat Eilat Israel

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