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The spatial dynamics of ecosystem engineers.

Caroline Franco1, José F Fontanari1

  • 1Instituto de Física de São Carlos, Universidade de São Paulo, Caixa Postal 369, 13560-970 São Carlos, São Paulo, Brazil.

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Summary
This summary is machine-generated.

Ecosystem engineers, organisms that modify habitats, require models including abiotic factors. Dispersal can prevent chaotic population dynamics and extinctions in these engineers.

Keywords:
Coupled map latticeEcosystem engineerNiche construction

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Area of Science:

  • Ecology
  • Theoretical Ecology
  • Mathematical Biology

Background:

  • Population dynamics models often overlook abiotic factors, focusing instead on species interactions.
  • Ecosystem engineers, crucial for habitat modification, necessitate models incorporating abiotic interactions for accurate dynamics.
  • Understanding engineer populations requires integrating habitat modification into ecological models.

Purpose of the Study:

  • To develop and analyze a spatially and temporally discrete model for ecosystem engineers.
  • To investigate the role of abiotic interactions and dispersal in engineer metapopulation dynamics.
  • To determine conditions under which dispersal influences chaotic dynamics and population persistence.

Main Methods:

  • A Ricker equation models engineer population growth with density-dependent carrying capacity linked to modified habitats.
  • A lattice-based model simulates engineers and habitats in discrete patches.
  • Diffusive dispersal is incorporated, allowing engineers to move between adjacent patches.

Main Results:

  • Metapopulation dynamics are influenced by dispersal only when local (single-patch) dynamics exhibit chaotic behavior.
  • Dispersal can suppress chaos and prevent population extinctions when the intrinsic growth rate is high.
  • The spatial structure and engineer-habitat feedback are critical for population persistence.

Conclusions:

  • Explicitly modeling abiotic interactions and habitat modification is essential for understanding ecosystem engineers.
  • Dispersal is a key factor in stabilizing populations of ecosystem engineers, particularly under high growth rates.
  • Spatially explicit models reveal how engineer-habitat feedback and dispersal interact to shape metapopulation dynamics.