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Finescale geomorphic pattern and biodiversity

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Lewisburg, PA. Plant Biodiversity Patterns. Explanations. With Apologies: One More! ... Colonization Lottery. Competition. Seed Production. Seed Dispersal ... – PowerPoint PPT presentation

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Title: Finescale geomorphic pattern and biodiversity


1
Fine-scale geomorphic pattern and biodiversity
  • Duane A. Griffin
  • and Phil Marquis
  • Bucknell University
  • Lewisburg, PA

2
Plant Biodiversity Patterns
3
Explanations
4
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9
With Apologies One More!
  • Competitive uncoupling hypothesis
  • Fine-scale habitat structure can disrupt
    interactions between individuals sharing a
    habitat.
  • If interactions are negative (competition,
    allelopathy, pathogen spread), fragmentation
    should disrupt trajectories towards exclusion,
    thereby increasing diversity.

10
How does this individual interact with others in
its habitat?
11
Direct interactions with immediate neighbors
(competition)
12
Direct interactions with immediate neighbors
(competition)
Mostly Deterministic
Mostly Stochastic
Seed dispersal and microsite colonization
13
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14
What if habitat patches are discrete and isolated
at fine scales?
15
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16
Colonization neighborhood remains the same
17
Resource competition neighborhood is smaller
18
y f(x)
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21
Testing GeoSim
  • Individual-Based
  • Spatially Explicit
  • Reaction-Diffusion Model

Seed Dispersal
Colonization Lottery
Diffusion Reaction
Competition
Seed Production
22
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24
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29
Landscapes
30
Experiment
  • 2 species a b
  • Asymmetric competition (aab 10, a ba 1)
  • Symmetric fecundity and dispersal parameters
  • 100 runs in each of
  • 9 unfragmented landscapes
  • 9 fragmented landscapes
  • Aggregation Index (Landscape statistics APACK v.
    2.23 (Mladenoff and DeZonia 2004)

31
Results Area Effect
32
Results Time to Extinction
33
Results
34
Conclusion
  • Fine-scale habitat fragmentation facilitates
    coexistence of competitively asymmetric species.
  • In a digital landscape, at least.

35
Does this happen in real landscapes?
36
Yes.
37
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38
Fragmentation, Diversity, Space, and Time
  • Fragmentation disrupts the processes governing
    membership in ecological communities.
  • Negatively
  • Positively
  • Allopatric speciation
  • Competitive uncoupling (?)

39
Fragmentation, Diversity, Space, and Time
Time
Space
40
Might Uncoupling Emerge at Broader Scales?
41
Might Uncoupling Emerge at Broader Scales?
42
Some Implications
  • Rare species may gain refuge in habitats with
    fine-scale fragmentation.
  • Habitats with fine-scale fragmentation may
    provide immigration points for exotic species.
  • Its worth looking into this

43
Acknowledgements
  • Office of the President, Bucknell University
  • Office of the Dean, Bucknell University College
    of Arts and Sciences
  • Bryn Scriver and John Stoddard

44
Thank you.
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