, 667:89 | Cite as

Pattern of nutrient availability and plant community assemblage in Everglades Tree Islands, Florida, USA

  • J. L. Espinar
  • M. S. Ross
  • J. P. Sah
Primary research paper


We address the relative importance of nutrient availability in relation to other physical and biological factors in determining plant community assemblages around Everglades Tree Islands (Everglades National Park, Florida, USA). We carried out a one-time survey of elevation, soil, water level and vegetation structure and composition at 138 plots located along transects in three tree islands in the Park’s major drainage basin. We used an RDA variance partitioning technique to assess the relative importance of nutrient availability (soil N and P) and other factors in explaining herb and tree assemblages of tree island tail and surrounded marshes. The upland areas of the tree islands accumulate P and show low N concentration, producing a strong island-wide gradient in soil N:P ratio. While soil N:P ratio plays a significant role in determining herb layer and tree layer community assemblage in tree island tails, nevertheless part of its variance is shared with hydrology. The total species variance explained by the predictors is very low. We define a strong gradient in nutrient availability (soil N:P ratio) closely related to hydrology. Hydrology and nutrient availability are both factors influencing community assemblages around tree islands, nevertheless both seem to be acting together and in a complex mechanism. Future research should be focused on segregating these two factors in order to determine whether nutrient leaching from tree islands is a factor determining community assemblages and local landscape pattern in the Everglades, and how this process might be affected by water management.


Biogeochemical hot-spot N:P ratio Phosphorus Self-assembly Spatial patterns Landscape ecology Wetlands 



We would like to acknowledge the assistance in field and lab provided by the following members of our lab: Pablo Ruiz, David Reed, David Jones, and Josh Walters. Dr. Krish Jayachandran, Seema Sah, and Darcy Stockman provided invaluable assistance on the soil analyses. Financial support for the project came from the Critical Ecosystems Science Initiative (CESI) of the National Park Service, US Department of Interior. The research was enhanced by collaboration with the Florida Coastal Everglades Long-Term Ecological Research program (funded by the National Science Foundation, # DEB-9910514 and DBI-0620409). This is SERC Contribution # 516.


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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.Estación Biológica de Doñana (EBD-CSIC)SevillaSpain
  2. 2.Southeast Environmental Research Center Florida International UniversityMiamiUSA

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