Sea otters are recovering in key areas of southern and central California, and through their role as an apex predator they are helping to restore ecosystem health by keeping populations of sea urchins in check and preying on invasive species, for example. (sciencedaily.com)
The stunting effect of a high CO2 ocean on calcification and development in sea urchin larvae, a synthesis from the tropics to the poles (dotearth.blogs.nytimes.com)
Michael Russell at Villanova University in Pennsylvania and his colleagues studied purple sea urchins from the west coast of North America. (newscientist.com)