Arctic krill use twilight to guide their daily rhythms through the polar winter

Most animals sync their body clocks to the daily rhythm of the sun, but what happens during the polar winter when the sun never rises above the horizon? According to a study by Jonathan Cohen at the University of Delaware and colleagues, publishing October 19th in the open-access journal PLOS Biology, arctic krill can detect tiny changes in light intensity during polar winter days, allowing them to maintain their daily biological rhythms. Northerly range expansions in response to climate change may force other marine species to evolve similar adaptations to thrive in this extreme environment.

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