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this is likely #bioconvection - upswimming of the motile organisms due to combination of light and negative gravitaxis, followed by sinking when the layer becomes too dense https://www.jstor.org/stable/pdf/43421291.pdf
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RT @Eudorina_ch
ゴニウムのこれはどんな反応によるものなんだろうか？
振動が原因？
大きさ的にある程度数が増えてこないと観察が難しい現象 https://t.co/8SSniydktV
https://twitter.com/Eudorina_ch/status/1604756971760291840
@micromotility indeed the video looks like familiar bioconvective plumes. I'm not sure it's been studied in detail for Eudorina