Marine Biodiversity

Evidence indicates that marine predator diversity has declined 10 - 50% in the past 50 years as a result of fishing pressure and changing climate.  Link: Global Patterns of Predator Diversity in the Open Oceans -- Worm et al., 10.1126/science.1113399 -- Science. 

The NY Times reported, after this post, on the Worm study.  It provides a more complete summary.  Biodiversity reduced in open oceans