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Lysperiode

Antallet af timer i en dag, hvor miljøet er let; Et interval i 24 timers cyklus, når levende organismer udsættes for lys, med hensyn til dets virkning på vækst, udvikling og adfærd.

Mængden af lys, der modtages sammen med temperaturen, er en ekstern faktor, der udløser migration af dyr eller planters phenofaser.

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