That's an excellent question.
It's a fairly common approach that one has to take, particularly when you're establishing.... Marine conservation areas are developed through a representativity, so what we've done is identify the 29 marine ecological regions. Our goal is to have a marine conservation area represent each one of those areas.
When you take that approach, as much as we do a significant amount of research in terms of understanding what locations are best from an ecosystem perspective, the bottom line is that there are a lot of unknowns. The precautionary principle is a fairly common way to manage areas, knowing that you are not going to understand all of the functioning of the ecosystems and that, even in the absence of clear scientific certainty, at times it's important to make decisions in those areas that favour conservation on a precautionary basis.