Ocean acidification reduces iodide production by the marine diatom Chaetoceros sp. (CCMP 1690)

Bey, E; Hughes, C; Hogg, K; Chance, R; Petrou, K

Ocean acidification reduces iodide production by the marine diatom Chaetoceros sp. (CCMP 1690)

Bey, E Hughes, C Hogg, K Chance, R Petrou, K

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Publisher:: ELSEVIER
Publication Type:: Journal Article
Citation:: Marine Chemistry, 2023, 257
Issue Date:: 2023-11-20

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Field	Value	Language
dc.contributor.author	Bey, E
dc.contributor.author	Hughes, C
dc.contributor.author	Hogg, K
dc.contributor.author	Chance, R
dc.contributor.author	Petrou, K https://orcid.org/0000-0002-2703-0694
dc.date.accessioned	2024-02-12T06:46:58Z
dc.date.available	2024-02-12T06:46:58Z
dc.date.issued	2023-11-20
dc.identifier.citation	Marine Chemistry, 2023, 257
dc.identifier.issn	0304-4203
dc.identifier.issn	1872-7581
dc.identifier.uri	http://hdl.handle.net/10453/175594
dc.description.abstract	Phytoplankton in marine surface waters play a key role in the global iodine cycle. The biologically-mediated iodide production under future scenarios is limited. Here we compare growth, iodate to iodide conversion rate and membrane permeability in the diatom Chaetoceros sp. (CCMP 1690) grown under seawater carbonate chemistry conditions projected for 2100 (1000 ppm) and pre-industrial (280 ppm) conditions. We found no effect of CO2 on growth rates, but a significantly higher cell yield under high CO2, suggesting sustained growth from relief from carbon limitation. Cell normalised iodate uptake (16.73 ± 0.92 amol IO3− cell−1) and iodide production (8.61 ± 0.15 amol I− cell−1) was lower in cultures grown at high pCO2 than those exposed to pre-industrial conditions (21.29 ± 2.37 amol IO3− cell−1, 11.91 ± 1.49 amol I− cell−1, respectively). Correlating these measurements with membrane permeability, we were able to ascertain that iodide conversion rates were not linked to cell permeability and that the processes of mediated iodate loss and diatom-iodide formation are decoupled. These findings are the first to implicate OA in driving a potential shift in diatom-mediated iodate reduction. If our results are indicative of diatom-mediated iodine cycling in 2100, future surface ocean conditions could experience reduced rates of iodide production by Chaetoceros spp., potentially lowering iodide concentrations in ocean regions dominated by this group. These changes have the potential to impact ozone cycling and new particle formation in the atmosphere.
dc.language	English
dc.publisher	ELSEVIER
dc.relation.ispartof	Marine Chemistry
dc.relation.isbasedon	10.1016/j.marchem.2023.104311
dc.rights	info:eu-repo/semantics/openAccess
dc.subject	0399 Other Chemical Sciences, 0402 Geochemistry, 0405 Oceanography
dc.subject.classification	Oceanography
dc.subject.classification	3703 Geochemistry
dc.subject.classification	3708 Oceanography
dc.title	Ocean acidification reduces iodide production by the marine diatom Chaetoceros sp. (CCMP 1690)
dc.type	Journal Article
utslib.citation.volume	257
utslib.for	0399 Other Chemical Sciences
utslib.for	0402 Geochemistry
utslib.for	0405 Oceanography
pubs.organisational-group	University of Technology Sydney
pubs.organisational-group	University of Technology Sydney/Faculty of Science
pubs.organisational-group	University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	open_access	*
dc.date.updated	2024-02-12T06:46:57Z
pubs.publication-status	Published
pubs.volume	257

Abstract:

Phytoplankton in marine surface waters play a key role in the global iodine cycle. The biologically-mediated iodide production under future scenarios is limited. Here we compare growth, iodate to iodide conversion rate and membrane permeability in the diatom Chaetoceros sp. (CCMP 1690) grown under seawater carbonate chemistry conditions projected for 2100 (1000 ppm) and pre-industrial (280 ppm) conditions. We found no effect of CO2 on growth rates, but a significantly higher cell yield under high CO2, suggesting sustained growth from relief from carbon limitation. Cell normalised iodate uptake (16.73 ± 0.92 amol IO3− cell−1) and iodide production (8.61 ± 0.15 amol I− cell−1) was lower in cultures grown at high pCO2 than those exposed to pre-industrial conditions (21.29 ± 2.37 amol IO3− cell−1, 11.91 ± 1.49 amol I− cell−1, respectively). Correlating these measurements with membrane permeability, we were able to ascertain that iodide conversion rates were not linked to cell permeability and that the processes of mediated iodate loss and diatom-iodide formation are decoupled. These findings are the first to implicate OA in driving a potential shift in diatom-mediated iodate reduction. If our results are indicative of diatom-mediated iodine cycling in 2100, future surface ocean conditions could experience reduced rates of iodide production by Chaetoceros spp., potentially lowering iodide concentrations in ocean regions dominated by this group. These changes have the potential to impact ozone cycling and new particle formation in the atmosphere.

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http://hdl.handle.net/10453/175594