Cited by 13Marine and coastal plant biologyCoastal wetland ecosystem dynamicsMarine and coastal ecosystems

Role of Macroalgal Forests within Mediterranean Shallow Bays in Blue Carbon Storage

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Moreda, Uxue, Mazarrasa, Inés, Cebrian, Emma, Kaal, Joeri, Ricart, Aurora M., Serrano, Eduard, Serrano, Oscar·2024·Science of The Total Environment

Abstract

Although seaweeds rank among the most productive vegetated habitats globally, their inclusion within Blue Carbon frameworks is at its onset, partially because they usually grow in rocky substrates and their organic carbon (Corg) is mostly exported and stored beyond their habitat and thus, demonstrating its long-term storage is challenging. Here, we studied the sedimentary Corg storage in macroalgal forests dominated by Gongolaria barbata and in adjacent seagrass Cymodocea nodosa mixed with Caulerpa prolifera algae meadows, and bare sand habitats in Mediterranean shallow coastal embayments. We characterized the biogeochemistry of top 30 cm sedimentary deposits, including sediment grain-size, organic matter and Corg contents, Corg burial rates and the provenance of sedimentary Corg throughout stable carbon isotopes (δ13Corg) and pyrolysis analyses. Sediment Corg stocks and burial rates (since 1950) in G. barbata forests (mean ± SE, 3.5 ± 0.2 kg Corg m−2 accumulated at 15.5 ± 1.6 g Corg m−2 y−1) fall within the range of those reported for traditional Blue Carbon Ecosystems. Although the main species contributing to sedimentary Corg stocks in all vegetated habitats examined was C. nodosa (36 ± 2 %), macroalgae contributed 49 % (19 ± 2 % by G. barbata and 30 ± 3 % by C. prolifera) based on isotope mixing model results. Analytical pyrolysis confirmed the presence of macroalgae-derived compounds in the sediments, including N-compounds and α-tocopherol linked to G. barbata and C. prolifera, respectively. The sedimentary Corg burial rate linked to macroalgae within the macroalgal forests examined ranged from 5.4 to 9.5 g Corg m−2 y−1 (7.4 ± 2 g Corg m−2 y−1), which is 4-fold higher than previous global estimates. This study provides empirical evidence for the long-term (~70 years) sequestration of macroalgae-derived Corg within and beyond seaweed forests in Mediterranean shallow coastal embayments and thereby, supports the inclusion of macroalgae in Blue Carbon frameworks.

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  1. Novoa, E.A.M., Guiry, M.D., 2019. Reinstatement of the genera Gongolaria Boehmer and Ericaria Stackhouse (Sargassaceae, Phaeophyceae). Eur. J. Phycol. 54 (3), 456.

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Authors
Moreda, U., Mazarrasa, I., Cebrian, E., Kaal, J., Ricart, A. M., Serrano, E., & Serrano, O.
Affiliations
  • Consejo Superior de Investigaciones Científicas (ES)
  • Universidad de Cantabria (ES)
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2024-07
Volume
934
Pages
173219
ISSN
0048-9697 (ISSN-L)
OpenAlex
W4396901970
Cited by
13
References
86
Citations by year
2026: 6 · 2025: 7
FWCI
2.79
Type
journal article
Language
en
Open access
Locations
  • The Science of The Total Environment (publishedVersion, cc-by)
  • SSRN Electronic Journal (acceptedVersion)
  • PubMed (publishedVersion)
  • UCrea (University of Cantabria) (submittedVersion, cc-by)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion, cc-by-nc)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
Funders
Spanish Scientific Research Council
Topics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal plant biology
  • Physical Sciences › Environmental Science › Ecology › Coastal wetland ecosystem dynamics
  • Physical Sciences › Earth and Planetary Sciences › Oceanography › Marine and coastal ecosystems
Keywords
macroalgal forests, blue carbon, sediment organic carbon, carbon burial rates, Gongolaria barbata, Cymodocea nodosa, Caulerpa prolifera, seagrass meadows, stable carbon isotopes, isotope mixing model, alpha-tocopherol, nitrogen compounds
MeSH terms
Carbon, Environmental Monitoring, Mediterranean Sea, Seaweed, Ecosystem, Geologic Sediments, Carbon Sequestration, Forests

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