Estuaries and Coasts

, Volume 42, Issue 8, pp 1991–2003 | Cite as

Climatic Controls on the Distribution of Foundation Plant Species in Coastal Wetlands of the Conterminous United States: Knowledge Gaps and Emerging Research Needs

  • Michael J. OslandEmail author
  • James B. Grace
  • Glenn R. Guntenspergen
  • Karen M. Thorne
  • Joel A. Carr
  • Laura C. Feher


Foundation plant species play a critical role in coastal wetlands, often modifying abiotic conditions that are too stressful for most organisms and providing the primary habitat features that support entire ecological communities. Here, we consider the influence of climatic drivers on the distribution of foundation plant species within coastal wetlands of the conterminous USA. Using region-level syntheses, we identified 24 dominant foundation plant species within 12 biogeographic regions, and we categorized species and biogeographic regions into four groups: graminoids, mangroves, succulents, and unvegetated. Literature searches were used to characterize the level of research directed at each of the 24 species. Most coastal wetlands research has been focused on a subset of foundation species, with about 45% of publications directed at just one grass species—Spartina alterniflora. An additional 14 and 8% have been directed, respectively, at two mangrove species—Rhizophora mangle and Avicennia germinans. At the national scale, winter temperature extremes govern the distribution of mangrove forests relative to salt marsh graminoids, and arid conditions can produce hypersaline conditions that increase the dominance of succulent plants, algal mats, and unvegetated tidal flats (i.e., salt flats, salt pans) relative to graminoid and mangrove plants. Collectively, our analyses illustrate the diversity of foundation plant species in the conterminous USA and begin to elucidate the influence of climatic drivers on their distribution. However, our results also highlight critical knowledge gaps and identify emerging research needs for assessing climate change impacts. Given the importance of plant-mediated processes in coastal wetland ecosystems, there is a pressing need in many biogeographic regions for additional species- and functional group-specific research that can be used to better anticipate coastal wetland responses to rising sea levels and changing temperature and precipitation regimes.


Coastal wetland Foundation species Plant functional group Salt marsh Mangrove forest United States 


Funding Information

This research was partially supported by the USGS Land Change Science Climate R&D Program, USGS Ecosystems Mission Area, Department of Interior Southeast Climate Adaptation Science Center, Department of Interior South Central Climate Adaptation Science Center, and the USGS Greater Everglades Priority Ecosystems Science Program. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Supplementary material

12237_2019_640_MOESM1_ESM.docx (204 kb)
ESM 1 (DOCX 203 kb)


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Copyright information

© This is a U.S. government work and its text is not subject to copyright protection in the United States; however, its text may be subject to foreign copyright protection 2019

Authors and Affiliations

  1. 1.Wetland and Aquatic Research CenterU.S. Geological SurveyLafayetteUSA
  2. 2.Patuxent Wildlife Research CenterU.S. Geological SurveyLaurelUSA
  3. 3.Western Ecological Research CenterU.S. Geological SurveyDavisUSA

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