in the direction of increasing light intensity and negative if the direction is opposite.

Phototaxis has been described in microorganisms and algea, insects and other invertebrates, and vertebrates. Typically nocturnal insects can show positive phototaxis, while nocturnal mammals often show negative phototaxis.

Phototaxis in bacteria and archea

Phototaxis can be advantageous for phototrophic bacteria as they can orient themselves most efficiently to

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