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Fotoperiodo

La quantità di ore in un giorno in cui la luce è presente; un intervallo nel ciclo di 24 ore in cui gli organismi viventi sono esposti alla luce, per quanto riguarda i suoi effetti sulla crescita, sullo sviluppo e sul comportamento.
La quantità di luce ricevuta, insieme alla temperatura, è uno dei fattori esterni che provocano la migrazione di animali o fenofasi delle piante.
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