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Efficient carbon recycling between calcification and photosynthesis in red coralline algae
State Key Laboratory of Marine Environmental Science, College of Ocean and Earth Sciences, Institute of Marine Microbes and Ecospheres, Xiamen University, Xiamen, China.
Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (UMFpub)ORCID iD: 0000-0002-3909-2235
Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (UMFpub)ORCID iD: 0000-0003-3434-0807
2024 (English)In: Biology Letters, ISSN 1744-9561, E-ISSN 1744-957X, Vol. 20, no 6, article id 20230598Article in journal (Refereed) Published
Abstract [en]

Red coralline algae create abundant, spatially vast, reef ecosystems throughout our coastal oceans with significant ecosystem service provision, but our understanding of their basic physiology is lacking. In particular, the balance and linkages between carbon-producing and carbon-sequestering processes remain poorly constrained, with significant implications for understanding their role in carbon sequestration and storage. Using dual radioisotope tracing, we provide evidence for coupling between photosynthesis (which requires CO2) and calcification (which releases CO2) in the red coralline alga Boreolithothamnion soriferum (previously Lithothamnion soriferum)-a marine ecosystem engineer widely distributed across Atlantic mid-high latitudes. Of the sequestered HCO3-, 38 ± 22% was deposited as carbonate skeleton while 39 ± 14% was incorporated into organic matter via photosynthesis. Only 38 ± 2% of the sequestered HCO3- was transformed into CO2, and almost 40% of that was internally recycled as photosynthetic substrate, reducing the net release of carbon to 23 ± 3% of the total uptake. The calcification rate was strongly dependent on photosynthetic substrate production, supporting the presence of photosynthetically enhanced calcification. The efficient carbon-recycling physiology reported here suggests that calcifying algae may not contribute as much to marine CO2 release as is currently assumed, supporting a reassessment of their role in blue carbon accounting.

Place, publisher, year, edition, pages
Royal Society, 2024. Vol. 20, no 6, article id 20230598
Keywords [en]
blue carbon, carbon sequestration, maerl, photophysiology, radioisotope, rhodolith
National Category
Ecology Climate Science
Identifiers
URN: urn:nbn:se:umu:diva-227586DOI: 10.1098/rsbl.2023.0598ISI: 001249088400004PubMedID: 38889774Scopus ID: 2-s2.0-85196583624OAI: oai:DiVA.org:umu-227586DiVA, id: diva2:1880427
Available from: 2024-07-01 Created: 2024-07-01 Last updated: 2025-02-01Bibliographically approved

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Burdett, H.L.Kamenos, N.A.

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