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Climate-driven tradeoffs between landscape connectivity and the maintenance of the coastal carbon sink

Author

Listed:
  • Kendall Valentine

    (College of William and Mary
    University of Washington)

  • Ellen R. Herbert

    (College of William and Mary
    Ducks Unlimited)

  • David C. Walters

    (College of William and Mary
    U.S. Geological Survey Eastern Ecological Science Center)

  • Yaping Chen

    (College of William and Mary)

  • Alexander J. Smith

    (College of William and Mary)

  • Matthew L. Kirwan

    (College of William and Mary)

Abstract

Ecosystem connectivity tends to increase the resilience and function of ecosystems responding to stressors. Coastal ecosystems sequester disproportionately large amounts of carbon, but rapid exchange of water, nutrients, and sediment makes them vulnerable to sea level rise and coastal erosion. Individual components of the coastal landscape (i.e., marsh, forest, bay) have contrasting responses to sea level rise, making it difficult to forecast the response of the integrated coastal carbon sink. Here we couple a spatially-explicit geomorphic model with a point-based carbon accumulation model, and show that landscape connectivity, in-situ carbon accumulation rates, and the size of the landscape-scale coastal carbon stock all peak at intermediate sea level rise rates despite divergent responses of individual components. Progressive loss of forest biomass under increasing sea level rise leads to a shift from a system dominated by forest biomass carbon towards one dominated by marsh soil carbon that is maintained by substantial recycling of organic carbon between marshes and bays. These results suggest that climate change strengthens connectivity between adjacent coastal ecosystems, but with tradeoffs that include a shift towards more labile carbon, smaller marsh and forest extents, and the accumulation of carbon in portions of the landscape more vulnerable to sea level rise and erosion.

Suggested Citation

  • Kendall Valentine & Ellen R. Herbert & David C. Walters & Yaping Chen & Alexander J. Smith & Matthew L. Kirwan, 2023. "Climate-driven tradeoffs between landscape connectivity and the maintenance of the coastal carbon sink," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36803-7
    DOI: 10.1038/s41467-023-36803-7
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    References listed on IDEAS

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    1. Mary Bryan Barksdale & Christopher J. Hein & Matthew L. Kirwan, 2023. "Shoreface erosion counters blue carbon accumulation in transgressive barrier-island systems," Nature Communications, Nature, vol. 14(1), pages 1-6, December.

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