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Ecosystems

, Volume 14, Issue 2, pp 298–310 | Cite as

Tree–Grass Coexistence in the Everglades Freshwater System

  • Paolo D’OdoricoEmail author
  • Vic Engel
  • Joel A. Carr
  • Steven F. Oberbauer
  • Michael S. Ross
  • Jay P. Sah
Article

Abstract

Mosaic freshwater landscapes exhibit tree-dominated patches —or tree islands—interspersed in a background of marshes and wet prairies. In the Florida Everglades, these patterned landscapes provide habitat for a variety of plant and animal species and are hotspots of biodiversity. Even though the emergence of patchy freshwater systems has been associated with climate histories, fluctuating hydrologic conditions, and internal feedbacks, a process-based quantitative understanding of the underlying dynamics is still missing. Here, we develop a mechanistic framework that relates the dynamics of vegetation, nutrients and soil accretion/loss through ecogeomorphic feedbacks and interactions with hydrologic drivers. We show that the stable coexistence of tree islands and marshes results as an effect of their both being (meta-) stable states of the system. However, tree islands are found to have only a limited resilience, in that changes in hydrologic conditions or vegetation cover may cause an abrupt shift to a stable marsh state. The inherent non-linear and discontinuous dynamics determining the stability and resilience of tree islands should be accounted for in efforts aiming at the management, conservation and restoration of these features.

Keywords

Tree islands Peatland Tree–grass coexistence Alternative stable states Resilience Savanna State shift 

Notes

Acknowledgements

Support from the National Park Service (Everglades National Park #H5284080004) is gratefully acknowledged. This manuscript has greatly benefited from comments provided by Dr. Laurel G. Larsen and Dr. Judson W. Harvey, an anonymous reviewer, and the subject editor, Dr. Donald DeAngelis.

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Copyright information

© Springer Science+Business Media, LLC (outside of USA) 2011

Authors and Affiliations

  • Paolo D’Odorico
    • 1
    Email author
  • Vic Engel
    • 2
  • Joel A. Carr
    • 1
  • Steven F. Oberbauer
    • 3
  • Michael S. Ross
    • 4
    • 5
  • Jay P. Sah
    • 5
  1. 1.Department of Environmental SciencesUniversity of VirginiaCharlottesvilleUSA
  2. 2.South Florida Natural Resource CenterHomesteadUSA
  3. 3.Department of Biological SciencesFlorida International UniversityMiamiUSA
  4. 4.Department of Environmental StudiesFlorida International UniversityMiamiUSA
  5. 5.Southeast Environmental Research Center, Florida International UniversityMiamiUSA

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