Zooplankton in the Arctic swim up and down in the water with the moon's cycle, and scientists think this behavior is so important and widespread that it should be seen as a basic part of how the Arctic ecosystem works—especially as the region changes.

The study shows that tiny ocean animals in the Arctic move up and down in the water every day and night based on the moon’s light, even in winter when the sun never rises. This behavior is so consistent and important that it should be seen as a normal, essential part of how the Arctic ocean works.