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Substrate composition directs slime molds behavior.

Fernando Patino-Ramirez1, Aurèle Boussard2, Chloé Arson3

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Slime molds alter their exploration and shape based on environmental cues. Nutritive or adverse substances slow movement and inhibit pseudopod formation, with adverse environments leading to revisiting explored areas.

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Area of Science:

  • Cell biology
  • Biophysics
  • Ecology

Background:

  • Cells, including unicellular organisms, are sensitive to environmental factors.
  • Amoeboid cells, like Physarum polycephalum, exhibit shape changes during locomotion and in response to stimuli.
  • Physarum polycephalum is a large, multinucleated amoeboid cell known for extending pseudopods.

Purpose of the Study:

  • To quantitatively measure changes in slime mold migration and shape in response to environmental stimuli.
  • To analyze how homogenous and non-homogenous environments with neutral, nutritive, and/or adverse substances affect slime mold behavior.
  • To develop an automated image analysis method for precise behavioral and morphological measurements.

Main Methods:

  • Developed a fully automated image analysis technique for quantitative measurement of cell migration and shape.
  • Measured key metrics including area coverage, exploration dynamics, migration rate, and slime mold morphology.
  • Assessed slime mold responses in environments with varying chemical substance types and spatial distributions.

Main Results:

  • The nature and spatial distribution of chemical substances significantly influence slime mold exploration behavior.
  • Both nutritive and adverse substances reduce exploration speed and suppress pseudopod formation.
  • In adverse environments, slime molds favor previously explored areas, utilizing mucus secretion as a buffer.
  • Slime mold migration rate is substrate-dependent until a critical distance to chemical substances is reached.

Conclusions:

  • Slime mold behavior is intricately linked to the chemical composition and spatial arrangement of their environment.
  • Environmental chemicals act as significant modulators of slime mold locomotion, morphology, and spatial exploration strategies.
  • Physarum polycephalum demonstrates adaptive behaviors, such as preferential site-reoccupation in adverse conditions, to optimize survival and resource utilization.