Census reveals sea life

摘要

The first global picture of life in the oceans has been sketched, with the completion of the decade-long Census of Marine Life.rnBut despite its 2700 scientists spending over 9000 days at sea, the exercise has only scratched the surface. In total, just 250,000 marine species have been described, out of the 1 million thought to exist. 'There are three to four unknown species for every known," says Paul Snelgrove of Memorial University of Newfoundland in St John's, Canada.