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A universal growth limit for circular lichens.

Agnese Seminara1, Joerg Fritz2, Michael P Brenner2

  • 1CNRS, UniversitĂ© CĂ´te d'Azur, Institut de Physique de Nice, UMR7010, Parc Valrose 06108, Nice, France agnese.seminara@unice.fr.

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|June 8, 2018
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Summary
This summary is machine-generated.

Lichens grow by fixing carbon dioxide, with growth patterns explained by CO2 diffusion. This model accurately describes how both small and large lichens expand over time.

Keywords:
coffee drop effectfungigrowth ratelichenometrymicrobiologypopulation biology

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Area of Science:

  • Ecology
  • Biophysics

Background:

  • Lichens are symbiotic organisms that play a role in carbon fixation.
  • Crustose and foliose lichens exhibit distinct growth patterns, with smaller individuals growing slowly and larger ones growing more rapidly.

Purpose of the Study:

  • To develop a model for lichen growth dynamics based on carbon dioxide diffusion.
  • To explain the observed differences in growth rates between small and large lichens.

Main Methods:

  • Translating the coffee drop effect to model lichen growth.
  • Analyzing carbon dioxide diffusion in the air surrounding lichen thalli.
  • Testing the model against empirical data of lichen growth.

Main Results:

  • Lichen growth patterns are directly influenced by the diffusion of carbon dioxide.
  • In small lichens, CO2 fixation occurs across the entire surface, contributing to radial growth.
  • In large lichens, CO2 fixation is disproportionately concentrated at the edges, driving growth.

Conclusions:

  • The developed model provides a universal framework for understanding lichen growth dynamics.
  • The model accurately predicts growth patterns for both small and large lichens in natural environments.
  • Carbon dioxide diffusion is a key factor governing lichen radial expansion.