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Evolution is resetting the annual clock in migratory birds


PhysOrg
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The timing of spring migration is vital for birds. Returning too late comes at a cost. In 1981, German ornithologist Eberhard Gwinner demonstrated how an internal circannual clock is responsible for the correct timing of flycatchers' migration. Replicating this experiment more than twenty years later, Barbara Helm, University of Groningen Associate Professor of Biological Rhythms of Natural Organisms, has shown there is an evolutionary response of this clock to climate. The results were published online on 24 October by the journal Current Biology.

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