Species richness and species pool size variation across
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Species richness and species pool size variation across p H gradients in Southern Blue Ridge Forests. Joel M. Gramling, Robert K. Peet, Jason D. Fridley, and Thomas R. Wentworth.

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Species richness and species pool size variation across pH gradients in Southern Blue Ridge Forests

Joel M. Gramling, Robert K. Peet, Jason D. Fridley, and Thomas R. Wentworth.


Should characteristics of a regional flora reflect the relative abundance of a soil type over the region’s evolutionary history?


Central european scenario
Central European Scenario relative abundance of a soil type over the region’s evolutionary history?

  • High pH specialists in the flora of Central Europe

  • Richness and edaphic characteristics vary according to the evolutionary centers of a regional flora (Pärtel 2002)


Central european scenario1
Central European Scenario relative abundance of a soil type over the region’s evolutionary history?

Ewald (in press) cites:

  • Dominance of calcium-rich environs around the time of the last glaciations

  • Recent environmental bottleneck


Southeastern usa scenario
Southeastern USA Scenario relative abundance of a soil type over the region’s evolutionary history?

How might these hypotheses be applied to the Southeastern USA?

  • Southern Blue Ridge Mountains have always had primarily acidic soils.

  • The flora of the Southern Blue Ridge would be expected to be acidophilic.


Southeastern usa scenario1
Southeastern USA Scenario relative abundance of a soil type over the region’s evolutionary history?

Does the Southern Blue Ridge exhibit a negative relationship between pH and species richness as implied by the findings of Pärtel and Ewald?

No.


Average number of species in 100 plot segments along a p h gradient
Average number of species in 100-plot segments along a relative abundance of a soil type over the region’s evolutionary history?pH gradient


Southeastern usa scenario2
Southeastern USA Scenario relative abundance of a soil type over the region’s evolutionary history?

How is the flora of the Southern Blue Ridge distributed across the pH gradient?


Species pool for a relative abundance of a soil type over the region’s evolutionary history?pH range calculated as the total number of species occurring in a set of 10,000 species occurrences


Genus pool for a relative abundance of a soil type over the region’s evolutionary history?pH range calculated as the total number of species occurring in a set of 10,000 species occurrences


Family pool for a relative abundance of a soil type over the region’s evolutionary history?pH range calculated as the total number of species occurring in a set of 10,000 species occurrences


Southeastern usa scenario3
Southeastern USA Scenario relative abundance of a soil type over the region’s evolutionary history?

How specialized is the flora of the Southern Blue Ridge across the pH gradient?


Species accumulation along the p h gradient based upon the total p h range of observed occurrences
Species accumulation along the relative abundance of a soil type over the region’s evolutionary history?pH gradient based upon the total pH range of observed occurrences


Species accumulation along the p h gradient based upon the total p h range of observed occurrences1
Species accumulation along the relative abundance of a soil type over the region’s evolutionary history?pH gradient based upon the total pH range of observed occurrences


Species accumulation along the p h gradient based upon the total p h range of observed occurrences2
Species accumulation along the relative abundance of a soil type over the region’s evolutionary history?pH gradient based upon the total pH range of observed occurrences


Cumulative species occurrences and cumulative species median positions encountered when moving across the pH gradient


Conclusions
Conclusions positions encountered when moving across the

  • Southern Blue Ridge diversity at the species, genus and family level is positively correlated to soil pH

  • Observed species pool is biased toward basic soils

  • Lack of high pH specialists in Southern Blue Ridge flora


Acknowledgements
Acknowledgements positions encountered when moving across the


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