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Substantial role of macroalgae in marine carbon sequestration

Abstract

Vegetated coastal habitats have been identified as important carbon sinks. In contrast to angiosperm-based habitats such as seagrass meadows, salt marshes and mangroves, marine macroalgae have largely been excluded from discussions of marine carbon sinks. Macroalgae are the dominant primary producers in the coastal zone, but they typically do not grow in habitats that are considered to accumulate large stocks of organic carbon. However, the presence of macroalgal carbon in the deep sea and sediments, where it is effectively sequestered from the atmosphere, has been reported. A synthesis of these data suggests that macroalgae could represent an important source of the carbon sequestered in marine sediments and the deep ocean. We propose two main modes for the transport of macroalgae to the deep ocean and sediments: macroalgal material drifting through submarine canyons, and the sinking of negatively buoyant macroalgal detritus. A rough estimate suggests that macroalgae could sequester about 173 TgC yr−1 (with a range of 61–268 TgC yr−1) globally. About 90% of this sequestration occurs through export to the deep sea, and the rest through burial in coastal sediments. This estimate exceeds that for carbon sequestered in angiosperm-based coastal habitats.

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Figure 1: Map of the locations where macroalgal carbon storage has been reported.
Figure 2: Conceptual diagram of the pathways for export and sequestration of macroalgal carbon.

KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY

Figure 3: Pathways for the sequestration of macroalgal carbon in the ocean.

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References

  1. Duarte, C. M., Middelburg, J. & Caraco, N. Major role of marine vegetation on the oceanic carbon cycle. Biogeosciences 2, 1–8 (2005).

    Article  Google Scholar 

  2. Nellemann, C. et al. Blue Carbon: a Rapid Response Assessment (United Nations Environment Programme, 2009).

  3. Mcleod, E. et al. A blueprint for blue carbon: toward an improved understanding of the role of vegetated coastal habitats in sequestering CO2 . Front. Ecol. Environ. 7, 362–370 (2011).

    Article  Google Scholar 

  4. Duarte, C. M., Losada, I. J. Hendriks, I. E. Mazarrasa I. & Marbà. N. The role of coastal plant communities for climate change mitigation and adaptation. Nat. Clim. Change 3, 961–968 (2013).

    Article  Google Scholar 

  5. Blue Future: coastal wetlands can have a crucial role in the fight against climate change. Nature 529, 255–256 (2016).

  6. Smith, S. V. Marine macrophytes as a global carbon sink. Science 211, 838–840 (1981).

    Article  Google Scholar 

  7. Duarte, C. M. & Cebrián, J. The fate of marine autotrophic production. Limnol. Oceanogr. 41, 1758–1766 (1996).

    Article  Google Scholar 

  8. Hill, R. et al. Can macroalgae contribute to blue carbon? an Australian perspective. Limnol. Oceanogr. 60, 1689–1706 (2015).

    Article  Google Scholar 

  9. Hardison, A. K. et al. Microphytobenthos and benthic macroalgae determine sediment organic matter composition in shallow photic sediments. Biogeosciences 10, 5571–5588 (2013).

    Article  Google Scholar 

  10. Krumhansl, K. A. & Scheibling, R. E. Production and fate of kelp detritus. Mar. Ecol. Prog. Ser. 67, 281–302 (2012).

    Article  Google Scholar 

  11. Filbee-Dexter, K. & Scheibling, R. E. Detrital kelp subsidy supports high reproductive condition of deep-living sea urchins in a sedimentary basin. Aquat. Biol. 23, 71–86 (2014).

    Article  Google Scholar 

  12. Barron, C., Apostolaki, E. T. & Duarte, C. M. Dissolved organic carbon fluxes by seagrass meadows and macroalgal beds. Front. Mar. Sci. 1, 42 (2014).

    Google Scholar 

  13. Barrón, C. & Duarte, C. M. Dissolved organic carbon pools and export from the coastal ocean. Glob. Biogeochem. Cycles 29, 1725–1738 (2015).

    Article  Google Scholar 

  14. Reed, D. C. et al. Patterns and controls of reef-scale production of dissolved organic carbon by giant kelp Macrocystis pyrifera. Limnol. Oceanogr. 60, 1996–2008 (2015).

    Article  Google Scholar 

  15. Sondak, C. F. & Chung, I. K. Potential blue carbon from coastal ecosystems in the Republic of Korea. Ocean Sci. J. 50, 1–8 (2015).

    Article  Google Scholar 

  16. van der Heijden, L. H. & Kamenos, N. A. Reviews and syntheses: calculating the global contribution of coralline algae to carbon burial. Biogeosciences 12, 6429–6441 (2015).

    Article  Google Scholar 

  17. Trevathan-Tackett, S. M. et al. Comparison of marine macrophytes for their contributions to blue carbon sequestration. Ecology 96, 3043–3057 (2015).

    Article  Google Scholar 

  18. Fraser, C. I. in Seaweed Phylogeography (ed. Fraser C. I.) Ch. 5, 131–146 (Springer, 2016).

    Book  Google Scholar 

  19. Macaya, E. C., López, B., Tala, F., Tellier, F. & Thiel, M. in Seaweed Phylogeography (ed. Fraser C. I.) Ch. 4, 97–130 (Springer, 2016).

    Book  Google Scholar 

  20. Garden, C. J. & Smith, A. M. Voyages of seaweeds: The role of macroalgae in sediment transport. Sediment. Geol. 318, 1–9 (2015).

    Article  Google Scholar 

  21. Wolff, T. The systematics and biology of bathyal and abyssal Isopoda Aselotta. Galathea Rep. 6, 1–320 (1962).

    Google Scholar 

  22. Fabry, V. J. & Deuser, W. G. Aragonite and magnesian calcite fluxes to the deep Sargasso Sea. Deep Sea Res. 38, 713–728 (1991).

    Article  Google Scholar 

  23. Han, T. & Runnegar, B. Megascopic eukaryotic algae from the 2.1-billion-year-old Negaunee Iron-Formation, Michigan. Science 257, 232–235 (1992).

    Article  Google Scholar 

  24. Sun, Y., Mao, S., Wang, F., Peng, P. & Chai, P. Identification of the Kukersite-type source rocks in the Ordovician stratigraphy from the Tarim Basin, NW China. Chinese Sci. Bull. 58, 4450–4458 (2013).

    Article  Google Scholar 

  25. Xie, X. et al. Petrology and hydrocarbon potential of microalgal and macroalgal dominated oil shales from the Eocene Huadian Formation, NE China. Int. J. Coal Geol. 124, 36–47 (2014).

    Article  Google Scholar 

  26. Renaud, P. E., Løkken, T. S., Jørgensen, L. L., Berge, J. & Johnson, B. J. Macroalgal detritus and food-web subsidies along an Arctic fjord depth-gradient. Front. Mar. Sci. 2, 31 (2015).

    Article  Google Scholar 

  27. Chikaraishi Y. in Treatise on Geochemistry 5: Organic Geochemistry (eds Birrer, B. et al.) Ch. 12.5, 95–123 (Elsevier, 2014).

    Book  Google Scholar 

  28. De Leo, F. C., Smith, C. R., Rowden, A. A., Bowden, D. A. & Clark, M. R. Submarine canyons: hotspots of benthic biomass and productivity in the deep sea. Proc. R. Soc. B. 277, 2783–2792 (2010).

    Article  Google Scholar 

  29. Canals, M. et al. Flushing submarine canyons. Nature 444, 354–357 (2006).

    Article  Google Scholar 

  30. Harrold, C. & Lisin, S. Radio-tracking rafts of giant kelp: local production and regional transport. J. Exp. Mar. Biol. Ecol. 130, 237–251 (1989).

    Article  Google Scholar 

  31. Palanques, A. et al. Downward particle fluxes and sediment accumulation rates in the western Bransfield Strait: implications of lateral transport for carbon cycle studies in Antarctic marginal seas. J. Mar. Res. 60, 347–365 (2002).

    Article  Google Scholar 

  32. de Bettignies, T. et al. Phenological decoupling of mortality from wave forcing in kelp beds. Ecology 96, 850–861 (2015).

    Article  Google Scholar 

  33. Dierssen, H. M., Zimmerman, R. C., Drake, L. A. & Burdige, D. J. Potential export of unattached benthic macroalgae to the deep sea trough wind-driven Langmuir circulation. Geophys. Res. Lett. 36, L04602 (2009).

    Article  Google Scholar 

  34. Hobday, A. J. Abundance and dispersal of drifting kelp Macrocystis pyrifera rafts in the Southern California Bight. Mar Ecol. Prog. Ser. 195, 101–116 (2000).

    Article  Google Scholar 

  35. Rowe, G. T. & Staresinic, N. Sources of organic matter to the deep-sea benthos. Ambio Special Report 1, 19–23 (1979).

    Article  Google Scholar 

  36. Kingsbury, J. M. Christopher Columbus as a botanist. Arnoldia 52, 11–28 (1992).

    Google Scholar 

  37. Johnson, D. L. & Richardson, P. L. On the wind-induced sinking of Sargassum. J. Exp. Mar. Biol. Ecol. 28, 255–267 (1977).

    Article  Google Scholar 

  38. Harrold, C., Light, K. & Lisin S. Organic enrichment of submarine canyon and continental shelf benthic communities by macroalgal drift imported from nearshore kelp forests. Limnol. Oceanogr. 43, 669–678 (1998).

    Article  Google Scholar 

  39. Bauer, J. E. & Druffel, E. R. Ocean margins as a significant source of organic matter to the deep open ocean. Nature 92, 482–485 (1998).

    Article  Google Scholar 

  40. Josselyn, M. N. et al. Composition, export and faunal utilization of drift vegetation in the Salt River submarine canyon. Estuar. Coast. Shelf Sci. 17, 447–465 (1983).

    Article  Google Scholar 

  41. Hardison, A., Canuel, E. A., Anderson, I. C. & Veuger, B. Fate of macroalgae in benthic systems: carbon and nitrogen cycling within the microbial community. Mar. Ecol. Prog. Ser. 414, 41–55 (2010).

    Article  Google Scholar 

  42. Wernberg, T. et al. Seaweed communities in retreat from ocean warming. Curr. Biol. 21, 1828–1832 (2011).

    Article  Google Scholar 

  43. Smale, D. A., Burrows, M. T., Moore, P., O'Connor, N. & Hawkins, S. J. Threats and knowledge gaps for ecosystem services provided by kelp forests: a northeast Atlantic perspective. Ecol. Evol. 3, 4016–4038 (2013).

    Article  Google Scholar 

  44. Poloczanska, E. S. et al. Global imprint of climate change on marine life. Nat. Clim. Change 3, 919–925 (2013).

    Article  Google Scholar 

  45. Krause-Jensen, D. & Duarte, C. M. Expansion of vegetated coastal ecosystems in the future Arctic. Front. Mar. Sci. 1, 77 (2014).

    Article  Google Scholar 

  46. Krumhansl, K. A., Lauzon-Guay, J. S. & Scheibling, R. E. Modeling effects of climate change and phase shifts on detrital production of a kelp bed. Ecology 95, 763–774 (2014).

    Article  Google Scholar 

  47. Duarte, C. M. Global change and the future ocean: a grand challenge for marine sciences. Front. Mar. Sci. 1, 63 (2014).

    Article  Google Scholar 

  48. Smetacek, V. & Zingone, A. Green and golden seaweed tides on the rise. Nature 504, 84–88 (2013).

    Article  Google Scholar 

  49. Duarte, C. M. et al. Will the oceans help feed humanity? BioScience 59, 967–976 (2009).

    Article  Google Scholar 

  50. Olsen, Y. How can mariculture better help feed humanity? Front. Mar. Sci. 2, 46 (2015).

    Article  Google Scholar 

  51. Gattuso, J. P., Frankignoulle, M. & Wollast, R. Carbon and carbonate metabolism in coastal aquatic ecosystems. Annu. Rev. Ecol. Syst. 29, 405–434 (1998).

    Article  Google Scholar 

  52. Whittaker, R. H. & Likens, G. E. Carbon and the biota. Brookhaven Symp. Biol. 24, 281–302 (1973).

    Google Scholar 

  53. Gattuso, J. P., Gentili, B., Duarte, C. M., Kleypas, J. A., Middelburg, J. J. & Antoine, D. Light availability in the coastal ocean: impact on the distribution of benthic photosynthetic organisms and their contribution to primary production. Biogeosciences 3, 489–513 (2006).

    Article  Google Scholar 

  54. Cebrian, J. & Duarte, C. M. The dependence of herbivory on growth rate in natural plant communities. Funct. Ecol. 4, 518–525 (1994).

    Article  Google Scholar 

  55. Duarte, C. M. Nutrient concentration of aquatic plants: patterns across species. Limnol. Oceanogr. 37, 882–889 (1992).

    Article  Google Scholar 

  56. Charpy-Roubaud, C. & Sournia, A. The comparative estimation of phytoplanktonic, microphytobenthic and macrophytobenthic primary production in the oceans. Mar. Microb. Food Webs 4, 31–57 (1990).

    Google Scholar 

  57. Baines, S. B. & Pace, M. L. The production of dissolved organic matter by phytoplankton and its importance to bacteria: patterns across marine and freshwater systems. Limnol. Oceanogr. 36, 1078–1090 (1991).

    Article  Google Scholar 

  58. Ciais, P. et al. in Climate Change 2013: The Physical Science Basis (eds Stocker, T. F. et al.) Ch. 6, 465–570 (IPCC, Cambridge Univ. Press, 2013).

    Google Scholar 

  59. Hardison, A., Canuel, E. A., Anderson, I. C. & Veuger, B. Fate of macroalgae in benthic systems: carbon and nitrogen cycling within the microbial community. Mar. Ecol. Prog. Ser. 414, 41–55 (2010).

    Article  Google Scholar 

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Acknowledgements

The study was funded by the COCOA project under the BONUS programme, which is funded by the EU 7th Framework Programme, the Danish Research Council and KAUST. We thank I. Gromicho (KAUST) for the artwork in Fig. 2 and A. Kjeldgaard and T. Christensen for help with Fig. 1. The study is also a contribution to the Greenland Ecosystem Monitoring programme (www.G-E-M.dk) and the Arctic Science Partnership (www.asp-net.org).

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Correspondence to Dorte Krause-Jensen.

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Krause-Jensen, D., Duarte, C. Substantial role of macroalgae in marine carbon sequestration. Nature Geosci 9, 737–742 (2016). https://doi.org/10.1038/ngeo2790

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