Explain both food and light as zeitgebers, Biology

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Must account for both food AND light as zeitgebers

Because of the continuous light / dark periods of the year; light not always able to act as a zeitgeber.

Food is essential for survival at these latitudes (build up of fat layer) so being able to anticipate seasonal food availability to synchronizing feeding to is an important survival mechanism
Feeding continuously through summer is important to build up fat reserves for winter months.

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