Articles | Volume 20, issue 14
https://doi.org/10.5194/bg-20-3073-2023
https://doi.org/10.5194/bg-20-3073-2023
Research article
 | 
31 Jul 2023
Research article |  | 31 Jul 2023

Absence of photophysiological response to iron addition in autumn phytoplankton in the Antarctic sea-ice zone

Asmita Singh, Susanne Fietz, Sandy J. Thomalla, Nicolas Sanchez, Murat V. Ardelan, Sébastien Moreau, Hanna M. Kauko, Agneta Fransson, Melissa Chierici, Saumik Samanta, Thato N. Mtshali, Alakendra N. Roychoudhury, and Thomas J. Ryan-Keogh

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Latest update: 26 Feb 2024
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Short summary
Despite the scarcity of iron in the Southern Ocean, seasonal blooms occur due to changes in nutrient and light availability. Surprisingly, during an autumn bloom in the Antarctic sea-ice zone, the results from incubation experiments showed no significant photophysiological response of phytoplankton to iron addition. This suggests that ambient iron concentrations were sufficient, challenging the notion of iron deficiency in the Southern Ocean through extended iron-replete post-bloom conditions.
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