The abundance of blue mussels in the intertidal zone declines in West Greenland as the climate changes from mild subarctic (south) to a cold Arctic (north). The pictures show the habitats in which mussels can survive: In the south mussels are found in open areas, but in the north, they can only survive in gaps between rocks. (Credit: Jakob Thyrring and Mikael K. Sejr)
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