Extended Data Table 2 Concentrations of 57Fe-siderophores (57Fe-S) and 27Al-siderophores (27Al-S) in seawater with depth after five days of incubation

From: Microbial iron limitation in the ocean’s twilight zone

  1. Separation and peak identifications are given in Fig. 4. In the euphotic zone to 150 m, the major loss of siderophores is from oxidation as labile carbon and nitrogen. There is little production of 27Al-siderophores. In the mesopelagic (200–400 m), most 57Fe-labelled siderophore is used for iron acquisition, and only small amounts of labelled siderophores were recovered at the end of the incubation. Production of 27Al-siderorphores from metal-free siderophores is high. Below 400 m, siderophore concentrations after incubation are similar to values measured in the controls, indicating little uptake for iron acquisition.
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