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Pine trees structure plant biodiversity patterns in savannas.

Raelene M Crandall1, Yingen M Chew1, Jennifer M Fill1

  • 1School of Forest Fisheries and Geomatics Sciences University of Florida Gainesville Florida USA.

Ecology and Evolution
|July 19, 2024
PubMed
Summary

Individual pine trees significantly alter understory plant communities in southeastern U.S. savannas, influencing species richness and composition based on proximity to the tree. This highlights the microhabitat created by trees.

Keywords:
canopy coverflatwoods (mesic)longleaf pine (Pinus palustris)prescribed firesandhills (xeric)spatialspecies richnessturnover

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Area of Science:

  • Ecology
  • Botany
  • Plant Community Ecology

Background:

  • Overstory trees in savannas influence understory species composition through factors like light availability, soil heterogeneity, and fire intensity.
  • Previous research indicates variations in understory species near trees versus in open areas, but this pattern lacks examination at the individual tree scale in southeastern U.S. pine savannas.

Purpose of the Study:

  • To investigate the relationship between understory plant communities and proximity to individual pine trees in xeric and mesic pine savannas.
  • To determine if individual pine trees create distinct microhabitats affecting understory species diversity and composition in frequently burned savanna ecosystems.

Main Methods:

  • An observational study was conducted in xeric and mesic pine savannas with frequent burning (1-3 year intervals).
  • Plant community composition was recorded in plots adjacent to tree boles (basal) and outside crown driplines (open).
  • Raw and rarefied species richness, along with community composition, were analyzed using multivariate methods.

Main Results:

  • Raw species richness was significantly higher in open plots compared to basal plots, correlating with greater light transmittance.
  • Rarefied species richness did not differ significantly between basal and open plots.
  • Community composition differed significantly between basal and open plots, with specific native woody species (Serenoa repens, Diospyros virginiana) and other understory plants showing varied abundance based on proximity to trees.

Conclusions:

  • Individual pine trees create significant microhabitat variation, influencing understory vegetation patterns in southeastern U.S. pine savannas.
  • The findings support the role of overstory trees in structuring savanna understory communities, impacting species distribution and diversity at a fine scale.