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dc.contributor.authorVopel, Kayen_NZ
dc.contributor.authorMarshall, Alexisen_NZ
dc.contributor.authorBrandt, Shelly Mia Marieen_NZ
dc.contributor.authorHartland, Adamen_NZ
dc.contributor.authorLee, Charles Kai-Wuen_NZ
dc.contributor.authorCary, S. Craigen_NZ
dc.contributor.authorPilditch, Conrad A.en_NZ
dc.date.accessioned2022-01-19T21:13:15Z
dc.date.available2022-01-19T21:13:15Z
dc.date.issued2021en_NZ
dc.identifier.issn2045-2322en_NZ
dc.identifier.urihttps://hdl.handle.net/10289/14724
dc.description.abstractEcosystem feedbacks in response to ocean acidification can amplify or diminish diel pH oscillations in productive coastal waters. Benthic microalgae generate such oscillations in sediment porewater and here we ask how CO₂ enrichment (acidification) of the overlying seawater alters these in the absence and presence of biogenic calcite. We placed a 1-mm layer of ground oyster shells, mimicking the arrival of dead calcifying biota (+Calcite), or sand (Control) onto intact silt sediment cores, and then gradually increased the pCO₂ in the seawater above half of +Calcite and Control cores from 472 to 1216 μatm (pH 8.0 to 7.6, CO₂:HCO₃⁻ from 4.8 to 9.6 × 10⁻⁴). Porewater [O₂] and [H⁺] microprofiles measured 16 d later showed that this enrichment had decreased the O₂ penetration depth (O₂-pd) in +Calcite and Control, indicating a metabolic response. In CO₂-enriched seawater: (1) sediment biogeochemical processes respectively added and removed more H+ to and from the sediment porewater in darkness and light, than in ambient seawater increasing the amplitude of the diel porewater [H⁺] oscillations, and (2) in darkness, calcite dissolution in +Calcite sediment decreased the porewater [H⁺] below that in overlying seawater, reversing the sediment–seawater H⁺ flux and decreasing the amplitude of diel [H⁺] oscillations. This dissolution did not, however, counter the negative effect of CO₂ enrichment on O₂-pd. We now hypothesise that feedback to CO₂ enrichment—an increase in the microbial reoxidation of reduced solutes with O₂—decreased the sediment O₂-pd and contributed to the enhanced porewater acidification.
dc.format.mimetypeapplication/pdf
dc.language.isoenen_NZ
dc.publisherNature Portfolioen_NZ
dc.rightsThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.
dc.subjectScience & Technologyen_NZ
dc.subjectMultidisciplinary Sciencesen_NZ
dc.subjectScience & Technology - Other Topicsen_NZ
dc.subjectPUTATIVE CARBONIC-ANHYDRASESen_NZ
dc.subject2 MARINE DIATOMSen_NZ
dc.subjectSATURATION STATEen_NZ
dc.subjectOXYGEN-UPTAKEen_NZ
dc.subjectSEA-WATERen_NZ
dc.subjectDISSOLUTIONen_NZ
dc.subjectSEAWATERen_NZ
dc.subjectCO2en_NZ
dc.subjectCHEMISTRYen_NZ
dc.subjectACIDen_NZ
dc.titleBiogeochemical feedbacks to ocean acidification in a cohesive photosynthetic sedimenten_NZ
dc.typeJournal Article
dc.identifier.doi10.1038/s41598-021-02314-yen_NZ
dc.relation.isPartOfScientific Reportsen_NZ
pubs.elements-id266387
pubs.issue1en_NZ
pubs.publication-statusPublisheden_NZ
pubs.volume11en_NZ
uow.identifier.article-noARTN 22867


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