Blue carbon: past, present and future, with emphasis on macroalgae

John Raven (Lead / Corresponding author)

    Research output: Contribution to journalReview article

    Abstract

    Blue carbon did not originally include macroalgal ecosystems; however evidence is mounting that macroalgal ecosystems function in marine carbon sequestration. The great majority of present day marine macroalgal net primary productivity (NPP) involves haptophytic algae on eroding shores. For these organisms the long-term storage of particulate organic carbon involves export from the site of production of biomass that has evaded parasites and grazers, and that some of the exported biomass is sedimented and stored rather than being mineralized en route by detritivores (microbes and fauna). Export from eroding shores, and subsequent storage, of haptophytic marine macroalgal particulate organic carbon could have started by 1.6 Ga. Storage on depositing shores close to the site of NPP by rhizophytic macroalgae and then by rhizophytic coastal seagrasses, tidal marshes and mangroves began not less than 209 Ma ago. Future increases in surface ocean temperatures may bring tropical marine macroalgae to their upper temperature limit, while temperate marine macroalgae will migrate poleward, in both cases assuming that temperature increases faster than genetic adaptation to higher temperature. Increased CO2 in the surface ocean will generally favour uncalcified over calcified marine macroalgae. This results in decreased CO2 release from decreased calcification, as well as decreased ballasting by CaCO3 of exported particulate organic carbon resulting in decreasing sedimentation. While much more work is needed, the available information suggests that macroalgae play a significant role in marine organic carbon storage.

    Original languageEnglish
    Article number20180336
    Pages (from-to)1-5
    Number of pages5
    JournalBiology Letters
    Volume14
    Issue number10
    Early online date3 Oct 2018
    DOIs
    Publication statusPublished - Oct 2018

    Fingerprint

    Seaweed
    macroalgae
    Carbon
    carbon
    Temperature
    carbon sequestration
    algae
    Oceans and Seas
    Biomass
    Ecosystem
    primary productivity
    temperature
    oceans
    Carbon Sequestration
    Wetlands
    ecosystems
    detritivores
    calcification
    salt marshes
    biomass production

    Keywords

    • Blue carbon
    • Carbon export
    • Carbon sequestration
    • Marine macroalgae
    • Palaeobiology

    Cite this

    Raven, John. / Blue carbon : past, present and future, with emphasis on macroalgae. In: Biology Letters. 2018 ; Vol. 14, No. 10. pp. 1-5.
    @article{79aa9d27a1a24205bf8d6ea4e460f839,
    title = "Blue carbon: past, present and future, with emphasis on macroalgae",
    abstract = "Blue carbon did not originally include macroalgal ecosystems; however evidence is mounting that macroalgal ecosystems function in marine carbon sequestration. The great majority of present day marine macroalgal net primary productivity (NPP) involves haptophytic algae on eroding shores. For these organisms the long-term storage of particulate organic carbon involves export from the site of production of biomass that has evaded parasites and grazers, and that some of the exported biomass is sedimented and stored rather than being mineralized en route by detritivores (microbes and fauna). Export from eroding shores, and subsequent storage, of haptophytic marine macroalgal particulate organic carbon could have started by 1.6 Ga. Storage on depositing shores close to the site of NPP by rhizophytic macroalgae and then by rhizophytic coastal seagrasses, tidal marshes and mangroves began not less than 209 Ma ago. Future increases in surface ocean temperatures may bring tropical marine macroalgae to their upper temperature limit, while temperate marine macroalgae will migrate poleward, in both cases assuming that temperature increases faster than genetic adaptation to higher temperature. Increased CO2 in the surface ocean will generally favour uncalcified over calcified marine macroalgae. This results in decreased CO2 release from decreased calcification, as well as decreased ballasting by CaCO3 of exported particulate organic carbon resulting in decreasing sedimentation. While much more work is needed, the available information suggests that macroalgae play a significant role in marine organic carbon storage.",
    keywords = "Blue carbon, Carbon export, Carbon sequestration, Marine macroalgae, Palaeobiology",
    author = "John Raven",
    note = "{\circledC} 2018 The Author(s).",
    year = "2018",
    month = "10",
    doi = "10.1098/rsbl.2018.0336",
    language = "English",
    volume = "14",
    pages = "1--5",
    journal = "Biology Letters",
    issn = "1744-9561",
    publisher = "The Royal Society",
    number = "10",

    }

    Blue carbon : past, present and future, with emphasis on macroalgae. / Raven, John (Lead / Corresponding author).

    In: Biology Letters, Vol. 14, No. 10, 20180336, 10.2018, p. 1-5.

    Research output: Contribution to journalReview article

    TY - JOUR

    T1 - Blue carbon

    T2 - past, present and future, with emphasis on macroalgae

    AU - Raven, John

    N1 - © 2018 The Author(s).

    PY - 2018/10

    Y1 - 2018/10

    N2 - Blue carbon did not originally include macroalgal ecosystems; however evidence is mounting that macroalgal ecosystems function in marine carbon sequestration. The great majority of present day marine macroalgal net primary productivity (NPP) involves haptophytic algae on eroding shores. For these organisms the long-term storage of particulate organic carbon involves export from the site of production of biomass that has evaded parasites and grazers, and that some of the exported biomass is sedimented and stored rather than being mineralized en route by detritivores (microbes and fauna). Export from eroding shores, and subsequent storage, of haptophytic marine macroalgal particulate organic carbon could have started by 1.6 Ga. Storage on depositing shores close to the site of NPP by rhizophytic macroalgae and then by rhizophytic coastal seagrasses, tidal marshes and mangroves began not less than 209 Ma ago. Future increases in surface ocean temperatures may bring tropical marine macroalgae to their upper temperature limit, while temperate marine macroalgae will migrate poleward, in both cases assuming that temperature increases faster than genetic adaptation to higher temperature. Increased CO2 in the surface ocean will generally favour uncalcified over calcified marine macroalgae. This results in decreased CO2 release from decreased calcification, as well as decreased ballasting by CaCO3 of exported particulate organic carbon resulting in decreasing sedimentation. While much more work is needed, the available information suggests that macroalgae play a significant role in marine organic carbon storage.

    AB - Blue carbon did not originally include macroalgal ecosystems; however evidence is mounting that macroalgal ecosystems function in marine carbon sequestration. The great majority of present day marine macroalgal net primary productivity (NPP) involves haptophytic algae on eroding shores. For these organisms the long-term storage of particulate organic carbon involves export from the site of production of biomass that has evaded parasites and grazers, and that some of the exported biomass is sedimented and stored rather than being mineralized en route by detritivores (microbes and fauna). Export from eroding shores, and subsequent storage, of haptophytic marine macroalgal particulate organic carbon could have started by 1.6 Ga. Storage on depositing shores close to the site of NPP by rhizophytic macroalgae and then by rhizophytic coastal seagrasses, tidal marshes and mangroves began not less than 209 Ma ago. Future increases in surface ocean temperatures may bring tropical marine macroalgae to their upper temperature limit, while temperate marine macroalgae will migrate poleward, in both cases assuming that temperature increases faster than genetic adaptation to higher temperature. Increased CO2 in the surface ocean will generally favour uncalcified over calcified marine macroalgae. This results in decreased CO2 release from decreased calcification, as well as decreased ballasting by CaCO3 of exported particulate organic carbon resulting in decreasing sedimentation. While much more work is needed, the available information suggests that macroalgae play a significant role in marine organic carbon storage.

    KW - Blue carbon

    KW - Carbon export

    KW - Carbon sequestration

    KW - Marine macroalgae

    KW - Palaeobiology

    U2 - 10.1098/rsbl.2018.0336

    DO - 10.1098/rsbl.2018.0336

    M3 - Review article

    C2 - 30282745

    VL - 14

    SP - 1

    EP - 5

    JO - Biology Letters

    JF - Biology Letters

    SN - 1744-9561

    IS - 10

    M1 - 20180336

    ER -