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Estuaries and Coasts

, Volume 42, Issue 5, pp 1308–1327 | Cite as

Coastal Wetland Geomorphic and Vegetative Change: Effects of Sea-Level Rise and Water Management on Brackish Marshes

  • Kimberly AndresEmail author
  • Michael Savarese
  • Brian Bovard
  • Michael Parsons
Article

Abstract

Conservation and management of coastal ecosystems require an understanding of how accelerated sea-level rise (SLR) and altered hydrology impact community shifts over time. This study evaluates the response of tidal wetlands of the Ten Thousand Islands, Collier County, Florida, to SLR and water management, with a focus on the development and distribution of tidal ponds across a wetland landscape. Sediment cores collected from marshes, mangroves, and tidal ponds reveal a clear transgressive stratigraphy. Facies analyses demonstrate that ponds originate from the surface downward through the degradation of marsh peat. Analyses of 1953 and 2009 aerial imagery using ArcGIS® software clearly identified tidal pond initiation, growth, and merger over time. Wetlands west of the Faka Union Canal, which have limited freshwater sheet flow due to canalization, are experiencing a greater increase in pond count, pond density (p = 0.0038), and mean pond area (p < 0.0001). Qualitative observations also recognize a relatively larger influence of mangrove envelopment over time in western sites compared with those retaining near-natural flows. Future land management plans must account for the expected submergence of inland marsh ecosystems driven by SLR and accelerated by hydrologic alteration. Continued restoration of freshwater sheet flow is necessary for slowing the regional transition (and loss) of graminoid marshes to either mangrove or pond environments. Without such action, a complete loss of these biologically diverse marsh ecosystems as mangrove forests encroach and marsh surfaces submerge is probable in the short term.

Keywords

Sea-level rise Water management Marsh Mangrove Tidal pond 

Notes

Acknowledgments

Sincere thanks go to the faculty, staff, and students of Florida Gulf Coast University and the Coastal Watershed Institute for providing tools and support for GIS, field, and lab analyses. We also appreciate the South Florida Water Management District (SFWMD) for securing helicopter use for sampling, and both the Ten Thousand Islands National Wildlife Refuge (TTINWR) and Fakahatchee Strand Preserve State Park for allowing access to their properties for fieldwork. Then, too, we recognize the Ten Thousand Islands Iron Rangers and Florida Gulf Coast University's College of Arts and Sciences for providing monies to cover publication costs. Gratitude especially goes to the following individuals: Ranger Larry Richardson of the TTINWR, U.S. Geological Survey Wetland and Aquatic Research Center staff Ken Krauss, Rebecca Howard, and Andy From, Mike Barry of Regional Conservation, GIS Specialist Jill Schmid of the Rookery Bay National Estuarine Research Reserve, and Tim Howard and Ananta Nath of SFWMD. The insight and input offered from each was indispensable in the completion of this research.

Supplementary material

12237_2019_538_MOESM1_ESM.docx (23 kb)
ESM 1 (DOCX 20 kb)
12237_2019_538_MOESM2_ESM.docx (593 kb)
ESM 2 (DOCX 592 kb)
12237_2019_538_MOESM3_ESM.pdf (136 kb)
ESM 3 (PDF 136 kb)

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Copyright information

© Coastal and Estuarine Research Federation 2019

Authors and Affiliations

  • Kimberly Andres
    • 1
    Email author
  • Michael Savarese
    • 1
  • Brian Bovard
    • 1
  • Michael Parsons
    • 1
  1. 1.Department of Marine and Ecological SciencesFlorida Gulf Coast UniversityFort MyersUSA

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