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Polyp oriented modelling of coral growth.

Roeland M H Merks1, Alfons G Hoekstra, Jaap A Kaandorp

  • 1Faculty of Science, Section Computational Science, University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands. post@roelandmerks.nl

Journal of Theoretical Biology
|June 5, 2004
PubMed
Summary

This study models stony coral growth by simulating individual polyps, revealing a "polyp fanning effect" that drives spontaneous branching and influences colony morphology. This polyp-oriented approach enhances understanding of coral growth patterns.

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Area of Science:

  • Marine Biology
  • Computational Biology
  • Ecology

Background:

  • Colonial stony coral morphogenesis is driven by collective polyp behavior.
  • Existing models often simplify coral growth as a continuous surface, neglecting individual polyp dynamics.

Purpose of the Study:

  • To develop and analyze a polyp-oriented model for stony coral growth.
  • To investigate the mechanisms of spontaneous branching and morphological plasticity in corals.

Main Methods:

  • Individual polyp modeling: simulating resource uptake, skeleton deposition, budding, and death.
  • Analysis of the "polyp fanning effect" on convex vs. flat/concave surfaces.
  • Exploration of polyp spacing, skeleton density variations, and resource translocation.

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Main Results:

  • The polyp-oriented model demonstrates spontaneous colony branching.
  • The "polyp fanning effect" is identified as a potent branching mechanism, surpassing previous Laplacian growth models.
  • Individual polyp properties, such as spacing and density variations, significantly influence colony morphology (branch thickness, compactness).

Conclusions:

  • A polyp-oriented model provides a more realistic approach to understanding stony coral morphogenesis.
  • The "polyp fanning effect" is a key driver of branching in stony corals.
  • Environmental factors influencing individual polyps can lead to significant colony-level morphological plasticity.