That's an excellent question, and there are two parts to it.
In some cases, certainly, there is the possibility that invasive species that are changing their distribution in response to changing ocean conditions will invade and potentially alter what we're trying to protect within a marine protected area. The example I just gave indicates that sometimes by protecting the integrity of the species in those ecosystems, they can in fact resist some of those invasions. That's one thought: by protecting the integrity of the ecosystem you may make it more resistant to some of those consequences.
One important element of network of protected areas is with respect to how you try to accommodate the shifting distribution of species as a result of climate change. One of the biggest ecological consequences of climate change globally is that species are changing their distribution. They're doing that on land and they're doing it in the ocean. The question is, if all these species are going to change their distribution, what's the point of making protected areas that are place-based? The nice thing about networks is that what you're doing is protecting the place where those species are going to land. For example, on land, one of the big concerns with climate change is that when you create parks and the environment then changes, those species need to shift their distribution, but Los Angeles might be in the way. Good luck with that.
This is the popularity of this idea of corridors, which allows species from one protected area to shift to another protected area on land. The cool thing in the ocean is you don't need corridors. The way species shift their distributions is their larvae move and colonize areas of favourable environmental conditions. You can do whatever you want, outside of the protected area. Those larvae will hopscotch to another protected area and then what you're doing is protecting areas for those species, and helping them make those shifts that they need to make in response to climate change.