Home Life Sciences Iodine, bromine and arsenic uptake, accumulation and efflux in three ecologically important Southern Hemisphere brown algae: Durvillaea antarctica, Macrocystis pyrifera and Lessonia trabeculata
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Iodine, bromine and arsenic uptake, accumulation and efflux in three ecologically important Southern Hemisphere brown algae: Durvillaea antarctica, Macrocystis pyrifera and Lessonia trabeculata

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Published/Copyright: December 12, 2025
Botanica Marina
From the journal Botanica Marina

Abstract

With a few exceptions, knowledge about halogen and arsenic metabolism is limited to Northern Hemisphere taxa. This study explores the uptake, accumulation and efflux of iodine in three of the most common Southern Hemisphere brown algae: Durvillaea antarctica, Macrocystis pyrifera and Lessonia trabeculatα. All three brown algal species investigated here showed measurable iodine uptake in steady state conditions and, conversely, iodine efflux during oxidative stress. The two species of Laminariales, Lessonia (6.7–19 mmol I kg−1 DW) and Macrocystis (6.1–17 mmol I kg−1 DW), both contained more iodine than Durvillaea (0.46–4 mmol I kg−1 DW; Fucales), but all three species contain much less iodine than previously studied Laminaria species. The studied algae also contain bromine and arsenic levels typical of brown algae reported from elsewhere, which are not affected by physiological conditions such as oxidative stress resulting in efflux of iodine.


Corresponding author: Frithjof C. Küpper, Department of Chemistry and Biochemistry, San Diego State University, San Diego, CA 92182-1030, USA; School of Biological Sciences, University of Aberdeen, Cruickshank Building, St. Machar Drive, Aberdeen AB24 3UU, Scotland, UK; Department of Chemistry, Marine Biodiscovery Centre, University of Aberdeen, Aberdeen AB24 3UE, Scotland, UK; and Oceanography Center, University of Cyprus, 1 Panepistimiou Av., 2109 Aglandjia, Nicosia, Cyprus, E-mail:
† Carl J. Carrano: deceased.

Award Identifier / Grant number: ASSEMBLE TA (grant no. 227788)

Acknowledgments

We are grateful for the support of the European Community research infrastructure action under the FP7 ‘capacities’ specific programme ASSEMBLE (grant no. 227788), enabling FCK, TMT and MM to work at the Estación Costiera de Investigaciones Marinas (ECIM) of the Pontificia Universidad Catolica (PUC) de Chile. At ECIM/PUC, we would especially like to thank Randy Finke, Santiago Andrade, Ricardo Calderón, and Sylvain Faugeron for their support of our research activities during our visit. Finally, we would like to express our deep gratitude to our friend and coauthor Carl J. Carrano, who untimely passed away during the writing of this article (Küpper et al. 2025).

  1. Research ethics: This work is fully compliant with the ethical standards of the University of Aberdeen, San Diego State University and the University of Graz.

  2. Informed consent: Not applicable.

  3. Author contributions: FCK and CJC designed this study, raised the funding and organized the expedition to Chile. FCK, TMT, MM, AR and JF performed experiments. FCK, TMT and MM performed scientific diving work. EPM and TMT analysed data. FCK and EPM wrote the manuscript. The authors have accepted responsibility for the entire content of this manuscript and approved its submission.

  4. Use of Large Language Models, AI and Machine Learning Tools: None declared.

  5. Conflict of interest: There is no conflict of interest to declare.

  6. Research funding: This work was supported by the European Community research infrastructure action under the FP7 ‘capacities’ specific programme ASSEMBLE (grant no. 227788).

  7. Data availability: All data are available from the corresponding author (FCK) upon request.

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Supplementary Material

This article contains supplementary material (https://doi.org/10.1515/bot-2025-0055).


Received: 2025-07-28
Accepted: 2025-09-03
Published Online: 2025-12-12

© 2025 Walter de Gruyter GmbH, Berlin/Boston

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