Assessing coastal wetland vulnerability to sea-level rise along the northern Gulf of Mexico coast: Gaps and opportunities for developing a coordinated regional sampling network

Last modified: 
December 13, 2019 - 8:50pm
Type: Journal Article
Year of publication: 2017
Date published: 09/2017
Authors: Michael Osland, Kereen Griffith, Jack Larriviere, Laura Feher, Donald Cahoon, Nicholas Enwright, David Oster, John Tirpak, Mark Woodrey, Renee Collini, Joseph Baustian, Joshua Breithaupt, Julia Cherry, Jeremy Conrad, Nicole Cormier, Carlos Coronado-Molina, Joseph Donoghue, Sean Graham, Jennifer Harper, Mark Hester, Rebecca Howard, Ken Krauss, Daniel Kroes, Robert Lane, Karen McKee, Irving Mendelssohn, Beth Middleton, Jena Moon, Sarai Piazza, Nicole Rankin, Fred Sklar, Greg Steyer, Kathleen Swanson, Christopher Swarzenski, William Vervaeke, Jonathan Willis, K. Van Wilson
Journal title: PLOS ONE
Volume: 12
Issue: 9
Pages: e0183431

Coastal wetland responses to sea-level rise are greatly influenced by biogeomorphic processes that affect wetland surface elevation. Small changes in elevation relative to sea level can lead to comparatively large changes in ecosystem structure, function, and stability. The surface elevation table-marker horizon (SET-MH) approach is being used globally to quantify the relative contributions of processes affecting wetland elevation change. Historically, SET-MH measurements have been obtained at local scales to address site-specific research questions. However, in the face of accelerated sea-level rise, there is an increasing need for elevation change network data that can be incorporated into regional ecological models and vulnerability assessments. In particular, there is a need for long-term, high-temporal resolution data that are strategically distributed across ecologically-relevant abiotic gradients. Here, we quantify the distribution of SET-MH stations along the northern Gulf of Mexico coast (USA) across political boundaries (states), wetland habitats, and ecologically-relevant abiotic gradients (i.e., gradients in temperature, precipitation, elevation, and relative sea-level rise). Our analyses identify areas with high SET-MH station densities as well as areas with notable gaps. Salt marshes, intermediate elevations, and colder areas with high rainfall have a high number of stations, while salt flat ecosystems, certain elevation zones, the mangrove-marsh ecotone, and hypersaline coastal areas with low rainfall have fewer stations. Due to rapid rates of wetland loss and relative sea-level rise, the state of Louisiana has the most extensive SET-MH station network in the region, and we provide several recent examples where data from Louisiana’s network have been used to assess and compare wetland vulnerability to sea-level rise. Our findings represent the first attempt to examine spatial gaps in SET-MH coverage across abiotic gradients. Our analyses can be used to transform a broadly disseminated and unplanned collection of SET-MH stations into a coordinated and strategic regional network. This regional network would provide data for predicting and preparing for the responses of coastal wetlands to accelerated sea-level rise and other aspects of global change.

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