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Tidal Marshes across a Chesapeake Bay Subestuary Are Not Keeping up with Sea-Level Rise

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  • Leah H Beckett
  • Andrew H Baldwin
  • Michael S Kearney

Abstract

Sea-level rise is a major factor in wetland loss worldwide, and in much of Chesapeake Bay (USA) the rate of sea-level rise is higher than the current global rate of 3.2 mm yr-1 due to regional subsidence. Marshes along estuarine salinity gradients differ in vegetation composition, productivity, decomposition pathways, and sediment dynamics, and may exhibit different responses to sea-level rise. Coastal marshes persist by building vertically at rates at or exceeding regional sea-level rise. In one of the first studies to examine elevation dynamics across an estuarine salinity gradient, we installed 15 surface elevation tables (SET) and accretion marker-horizon plots (MH) in tidal freshwater, oligohaline, and brackish marshes across a Chesapeake Bay subestuary. Over the course of four years, wetlands across the subestuary decreased 1.8 ± 2.7 mm yr-1 in elevation on average, at least 5 mm yr-1 below that needed to keep pace with global sea-level rise. Elevation change rates did not significantly differ among the marshes studied, and ranged from -9.8 ± 6.9 to 4.5 ± 4.3 mm yr-1. Surface accretion of deposited mineral and organic matter was uniformly high across the estuary (~9–15 mm yr-1), indicating that elevation loss was not due to lack of accretionary input. Position in the estuary and associated salinity regime were not related to elevation change or surface matter accretion. Previous studies have focused on surface elevation change in marshes of uniform salinity (e.g., salt marshes); however, our findings highlight the need for elevation studies in marshes of all salinity regimes and different geomorphic positions, and warn that brackish, oligohaline, and freshwater tidal wetlands may be at similarly high risk of submergence in some estuaries.

Suggested Citation

  • Leah H Beckett & Andrew H Baldwin & Michael S Kearney, 2016. "Tidal Marshes across a Chesapeake Bay Subestuary Are Not Keeping up with Sea-Level Rise," PLOS ONE, Public Library of Science, vol. 11(7), pages 1-12, July.
    • Handle: RePEc:plo:pone00:0159753
    DOI: 10.1371/journal.pone.0159753
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    1. Asbury H. Sallenger & Kara S. Doran & Peter A. Howd, 2012. "Hotspot of accelerated sea-level rise on the Atlantic coast of North America," Nature Climate Change, Nature, vol. 2(12), pages 884-888, December.
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    1. Amr E. Keshta & J. C. Alexis Riter & Kamal H. Shaltout & Andrew H. Baldwin & Michael Kearney & Ahmed Sharaf El-Din & Ebrahem M. Eid, 2022. "Loss of Coastal Wetlands in Lake Burullus, Egypt: A GIS and Remote-Sensing Study," Sustainability, MDPI, vol. 14(9), pages 1-16, April.
    2. Rebekah Grieger & Samantha J. Capon & Wade L. Hadwen & Brendan Mackey, 2020. "Between a bog and a hard place: a global review of climate change effects on coastal freshwater wetlands," Climatic Change, Springer, vol. 163(1), pages 161-179, November.

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