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The blue carbon of southern southwest Atlantic salt marshes and their biotic and abiotic drivers

Author

Listed:
  • Paulina Martinetto

    (Laboratorio de Ecología, Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP-CONICET))

  • Juan Alberti

    (Laboratorio de Ecología, Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP-CONICET))

  • María Eugenia Becherucci

    (Laboratorio de Ecología, Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP-CONICET))

  • Just Cebrian

    (Mississippi State University, NOAA NCEI
    “Vesta, PBC”)

  • Oscar Iribarne

    (Laboratorio de Ecología, Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP-CONICET))

  • Núria Marbà

    (IMEDEA (CSIC-UIB), Institut Mediterrani d’Estudis Avançats)

  • Diana Montemayor

    (Laboratorio de Ecología, Instituto de Investigaciones Marinas y Costeras (IIMyC, UNMdP-CONICET))

  • Eric Sparks

    (Mississippi State University
    Mississippi-Alabama Sea Grant Consortium)

  • Raymond Ward

    (Queen Mary University of London
    Estonia University of Life Sciences
    Universidade Federal do Ceará)

Abstract

Coastal vegetated ecosystems are acknowledged for their capacity to sequester organic carbon (OC), known as blue C. Yet, blue C global accounting is incomplete, with major gaps in southern hemisphere data. It also shows a large variability suggesting that the interaction between environmental and biological drivers is important at the local scale. In southwest Atlantic salt marshes, to account for the space occupied by crab burrows, it is key to avoid overestimates. Here we found that southern southwest Atlantic salt marshes store on average 42.43 (SE = 27.56) Mg OC·ha−1 (40.74 (SE = 2.7) in belowground) and bury in average 47.62 g OC·m−2·yr−1 (ranging from 7.38 to 204.21). Accretion rates, granulometry, plant species and burrowing crabs were identified as the main factors in determining belowground OC stocks. These data lead to an updated global estimation for stocks in salt marshes of 185.89 Mg OC·ha−1 (n = 743; SE = 4.92) and a C burial rate of 199.61 g OC·m−2·yr−1 (n = 193; SE = 16.04), which are lower than previous estimates.

Suggested Citation

  • Paulina Martinetto & Juan Alberti & María Eugenia Becherucci & Just Cebrian & Oscar Iribarne & Núria Marbà & Diana Montemayor & Eric Sparks & Raymond Ward, 2023. "The blue carbon of southern southwest Atlantic salt marshes and their biotic and abiotic drivers," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-44196-w
    DOI: 10.1038/s41467-023-44196-w
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    References listed on IDEAS

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    1. Carlos M. Duarte & Iñigo J. Losada & Iris E. Hendriks & Inés Mazarrasa & Núria Marbà, 2013. "The role of coastal plant communities for climate change mitigation and adaptation," Nature Climate Change, Nature, vol. 3(11), pages 961-968, November.
    2. Sinéad M. Crotty & Daniele Pinton & Alberto Canestrelli & Hallie S. Fischman & Collin Ortals & Nicholas R. Dahl & Sydney Williams & Tjeerd J. Bouma & Christine Angelini, 2023. "Faunal engineering stimulates landscape-scale accretion in southeastern US salt marshes," Nature Communications, Nature, vol. 14(1), pages 1-15, December.
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