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Xu, Dong, Brennan, Georgina, Xu, Le, Zhang, Xiao W., Fan, Xiao, Han, Wen T., Mock, Thomas 
ORCID: https://orcid.org/0000-0001-9604-0362, Mcminn, Andrew, Hutchins, David A. and Ye, Naihao
(2019)
Ocean acidification increases iodine accumulation in kelp-based coastal food webs.
Global Change Biology, 25 (2).
pp. 629-639.
ISSN 1354-1013
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Abstract
Kelp are main iodine accumulators in the ocean, and their growth and photosynthesis are likely to benefit from elevated seawater CO2 levels due to ocean acidification. However, there are currently no data on the effects of ocean acidification on iodine metabolism in kelp. As key primary producers in coastal ecosystems worldwide, any change in their iodine metabolism caused by climate change will potentially have important consequences for global geochemical cycles of iodine, including iodine levels of coastal food webs that underpin the nutrition of billions of humans around the world. Here, we found that elevated pCO2 enhanced growth and increased iodine accumulation not only in the model kelp Saccharina japonica using both short‐term laboratory experiment and long‐term in situ mesocosms, but also in several other edible and ecologically significant seaweeds using long‐term in situ mesocosms. Transcriptomic and proteomic analysis of S. japonica revealed that most vanadium‐dependent haloperoxidase genes involved in iodine efflux during oxidative stress are down‐regulated under increasing pCO2, suggesting that ocean acidification alleviates oxidative stress in kelp, which might contribute to their enhanced growth. When consumed by abalone (Haliotis discus), elevated iodine concentrations in S. japonica caused increased iodine accumulation in abalone, accompanied by reduced synthesis of thyroid hormones. Thus, our results suggest that kelp will benefit from ocean acidification by a reduction in environmental stress however, iodine levels in kelp‐based coastal food webs will increase, with potential impacts on biogeochemical cycles of iodine in coastal ecosystems.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | saccharina japonica,iodine metabolism,kelp,ocean acidification,thyroid hormone,vanadium-dependent haloperoxidase,global and planetary change,environmental chemistry,ecology,environmental science(all),sdg 13 - climate action,sdg 14 - life below water ,/dk/atira/pure/subjectarea/asjc/2300/2306 |
| Faculty \ School: | Faculty of Science > School of Environmental Sciences |
| UEA Research Groups: | Faculty of Science > Research Centres > Centre for Ecology, Evolution and Conservation Faculty of Science > Research Groups > Centre for Ocean and Atmospheric Sciences Faculty of Science > Research Groups > Environmental Biology |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 01 Nov 2018 15:30 |
| Last Modified: | 13 Apr 2023 13:56 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/68735 |
| DOI: | 10.1111/gcb.14467 |
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