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Metapopulation Dynamics

Metapopulation Dynamics. Metapopulation structure: Demes linked via dispersal Local scale: colonization, extinction Regional scale: Occupation frequency global extinction. University of Kentucky. Extinction, Re-colonization Dynamics. Metapopulation Dynamics.

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Metapopulation Dynamics

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  1. Metapopulation Dynamics Metapopulation structure: Demes linked via dispersal Local scale: colonization, extinction Regional scale: Occupation frequency global extinction

  2. University of Kentucky

  3. Extinction, Re-colonization Dynamics

  4. Metapopulation Dynamics p(t): proportion patches occupied, time t Spatially implicit (ignore spatial structure): All patches equally linked

  5. Metapopulation Dynamics Predict: p*, equilibrium occupation frequency Equilibrium: colonization = extinction Closed metapopulation (internal colonization) Open metapopulation (island-mainland)

  6. Closed Metapopulation

  7. Open Metapoulation Colonization: propagule rain from mainland x frequency of open sites Extinction: linear in occupied-site frequency

  8. Open Metapoulation

  9. Metapopulation Dynamics Assume: Patches identical: colonization, extinction Each patch direct link to all others c, m, e constants Total number of patches large

  10. Patch Size, Inter-Patch Distance

  11. Migration: Mass, Temperature

  12. Metapopulation Extinction Local extinction versus global extinction Consider spatial synchrony across demes Local densities correlate positively Moran effect Dispersal and “simpler” dynamics

  13. Metapopulation Extinction High synchrony  Global extinction Asynchrony  Regional persistence Chaos: “nearby trajectories diverge” Can increase local extinction; reduce global extinction

  14. Global Synchrony

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