Species richness and species pool size variation across
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Joel M. Gramling, Robert K. Peet, Jason D. Fridley, and Thomas R. Wentworth. PowerPoint PPT Presentation


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

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Joel m gramling robert k peet jason d fridley and thomas r wentworth

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.


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

  • 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

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

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

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 pH gradient


Southeastern usa scenario2

Southeastern USA Scenario

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


Joel m gramling robert k peet jason d fridley and thomas r wentworth

Species pool for a pH range calculated as the total number of species occurring in a set of 10,000 species occurrences


Joel m gramling robert k peet jason d fridley and thomas r wentworth

Genus pool for a pH range calculated as the total number of species occurring in a set of 10,000 species occurrences


Joel m gramling robert k peet jason d fridley and thomas r wentworth

Family pool for a pH range calculated as the total number of species occurring in a set of 10,000 species occurrences


Southeastern usa scenario3

Southeastern USA Scenario

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 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 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 pH gradient based upon the total pH range of observed occurrences


Joel m gramling robert k peet jason d fridley and thomas r wentworth

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


Conclusions

Conclusions

  • 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


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