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Cyclic dynamics in simulated plant populations.

Silke Bauer1, Uta Berger, Hanno Hildenbrandt

  • 1UFZ Centre for Environmental Research Leipzig-Halle, Department of Ecological Modelling, Permoserstrasse 15, 04318 Leipzig, Germany. silke@oesa.ufz.de

Proceedings. Biological Sciences
|December 24, 2002
PubMed
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Plant populations can exhibit complex population cycles, challenging the assumption of stable equilibria. Local competition and suppressed recruitment are key drivers of these dynamics, impacting plant community coexistence.

Area of Science:

  • Ecology
  • Population Dynamics
  • Mathematical Biology

Background:

  • Plant populations are often assumed to maintain stable equilibria, unlike animal populations which exhibit nonlinear dynamics.
  • Existing empirical studies on plant population dynamics are often too short, and modeling studies frequently overlook spatial competition and establishment processes.

Purpose of the Study:

  • To explore mechanisms generating complex population dynamics, specifically cycles, in plant populations.
  • To investigate the role of spatial aspects of local competition and establishment in plant population dynamics.

Main Methods:

  • Utilized a spatially explicit, individual-based model of a hypothetical, non-clonal perennial plant.
  • Employed the field-of-neighbourhood approach to phenomenologically describe local competition and establishment.

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Main Results:

  • Cyclic population dynamics were observed across a broad range of model variants.
  • These cycles occurred when mortality was driven by local competition and recruitment was significantly inhibited within the established plants' zones of influence.

Conclusions:

  • Local processes, such as competition and recruitment suppression, can destabilize plant populations and generate cyclic dynamics.
  • These findings suggest that local interactions play a crucial role in plant community dynamics and species coexistence, challenging traditional ecological assumptions.