![]() When it is darkest in the Arctic polar night, that's when they swim to the surface in search of bioluminescent food.Ī new study published in PLOS Biology looked at this visual sensitivity rhythm in Arctic krill during the Arctic polar night. When it is lightest in the Arctic polar night - a time of year at high latitudes when the sun remains below the horizon for the entire 24-hour period - usually around the middle of the day known as midday twilight, the Arctic krill know to swim down to the bottom in order to hide from predators. It turns out that the same thing happens for Arctic krill. ![]() During the night time, our eyes become more sensitive to adjust to the lack of light available. Because of this, our visual system changes so that it can be ready to work under brighter light conditions. ![]() During the day, it is typically lighter than at night.
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