Gulf Stream

Little auks (Alle alle) flock to Hornsund each summer to nest and feed on a tiny, fat-filled crustacean called Calanus glacialis. The copepod lives in cold Arctic waters, often near the edge of the sea ice in the Arctic Ocean. Photograph by Hannah Hoag

Sea Change

The Arctic Ocean is beginning to look and act more like the Atlantic. It's a shift that threatens to upend an entire food web built on frigid waters.