ScienceDaily Posted June 19, 2013 Share Posted June 19, 2013 Our internal circadian clock regulates daily life processes and is synchronized by external cues, the so-called Zeitgebers. The main cue is the light-dark cycle, whose strength is largely reduced in extreme habitats such as in the Arctic during the polar summer. Using a radiotelemetry system biologists have now found, in four bird species in Alaska, different daily activity patterns ranging from strictly rhythmic to completely arrhythmic. Read the full article on ScienceDaily Link to comment Share on other sites More sharing options...
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