Sea urchin populations in Florida Keys unaffected by ecosystem change

A study on sea urchins in the Florida Keys suggests that the populations of sand dollars and heart urchins, pictured here, and sea biscuits have remained stable since the 1960s despite escalating environmental stress caused by human activity. [Research supported by U.S. National Science ...This is an NSF Multimedia Gallery item.
Source: NSF Multimedia Gallery - Category: Science Source Type: video