Short-term memory effects in the phototactic behavior of microalgae

Laroussi, Taha; Jarrahi, Mojtaba; Amselem, Gabriel

doi:10.1039/d3sm01628e

Soft Matter

2024

DOI: 10.1039/d3sm01628e

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Short-term memory effects in the phototactic behavior of microalgae

Taha Laroussi,

Mojtaba Jarrahi,

Gabriel Amselem

Abstract: Phototaxis, the directed motion in response to a light stimulus, is crucial for motile microorganisms that rely on photosynthesis, such as the unicellular microalga Chlamydomonas reinhardtii. It is well known...

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2024

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References 41 publications

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Adaptation-induced oscillatory phototaxis and emergence of ordered density bands in the microswimmerChlamydomonas reinhardtii

Wang,

Tsang

2024

Preprint

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Biological microswimmers exhibit versatile taxis behaviors and switch between multiple behavioral states to navigate the environment and search for physiologically favorable regions. Here, we report a striking oscillatory phototaxis observed inChlamydomonas reinhardtii, where cells swim back-and-forth under a constant, unidirectional light stimulus due to alternation between positive and negative phototaxis. This oscillatory phototaxis at the individual cellular level further leads to the emergence of a highly ordered, propagating band structure formed by high densityChlamydomonascells collectively. We experimentally verify a unified phototaxis mechanism that couples light detection, light adaptation, flagella dynamics and cell reorientation, showing that transition between phototaxis modes is achieved by switching of flagella waveforms and modulation of flagella phase difference. Oscillatory phototaxis emerges as a semi-stable state in an overlapping light intensity regime for positive and negative phototaxis, where adaptation shifts the light intensity thresholds over times. This adaptation mechanism over multiple time scales enables phototactic microswimmers to effectively expand the survival range of light intensity and provide collective photoprotection for the colonies through the formation of dynamic band structures with high density.

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Adaptation-induced oscillatory phototaxis and emergence of ordered density bands in the microswimmerChlamydomonas reinhardtii

Wang,

Tsang

2024

Preprint

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Short-term memory effects in the phototactic behavior of microalgae

Abstract: Phototaxis, the directed motion in response to a light stimulus, is crucial for motile microorganisms that rely on photosynthesis, such as the unicellular microalga Chlamydomonas reinhardtii. It is well known...

Cited by 1 publication

References 41 publications

Adaptation-induced oscillatory phototaxis and emergence of ordered density bands in the microswimmerChlamydomonas reinhardtii

Adaptation-induced oscillatory phototaxis and emergence of ordered density bands in the microswimmerChlamydomonas reinhardtii

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