What are we actually protecting in the ocean?
The authors contend in this National Geographic Ocean Views blog that most marine species are not well represented within MPAs and several hundred species are not covered at all. The blog summarizes their article in Natures's Scientific Reports:
Klein, C.J., C.J. Brown, B.S. Halpern, D.B. Segan, J. McGowan, M. Beger, and J. E. M. Watson. 2015. Shortfalls in the global protected area network at representing marine biodiversity. Scientific Reports 5 Article 17539.