Saving our Seas

Dr Anjani Ganase considers recent scientific studies on sea urchins, coral reefs and management targets; and arrives at the conclusion expressed by environmentalist David Attenborough and echoed by other scientists and ocean advocates. The Ocean must be protected and managed everywhere. Long spined sea urchin. Photo by Jonathan Gomez Sea Urchins: pest or protector The Caribbean Sea is lined by islands and coral reefs that are unique. Forty years ago, these coral reefs were dominated by sea urchins, specifically the long-spined sea urchin ( Diadema antillarum ). These urchins were once regarded as a nuisance especially in the shallows in the seagrass beds. However, only after the 1980s, did we recognise the critical function of this specific species of sea urchin after they were destroyed by a disease throughout the Caribbean. These were important grazers, like cows grazing a meadow, ensuring that the bare surfaces of reefs were regularly cleaned of algae, t...