The IUCN categories were designed by the International Union for the Conservation of Nature. The question of which is adopted as a definition for international agreements or treaties is somewhat different when it comes to the IUCN. Traditionally the definitions for IUCN categories have been used. So we still have those, but the Aichi agreement added other effective area-based conservation measures. I think at this point in time there are still conversations going on about exactly what is meant by that. I think Canada should get its voice into that discussion.
On May 2nd, 2013. See this statement in context.