Oh yeah, another Bicentennial Park junkie like me!
Pretty much cain toad, you gotta go into the specific biophysical interactions with the case studies, biogeographical processe, hydrological cycle, nutrient cycling and energy flows within the ecosystem. Then you got vulnerability and resilience from stress, which can vary due to different biophysical interactions, like wetlands have low biodiversity, so they are more vulnerable to attack. yadda yadda yadda
Funny thing is, I just realised you wrote this like 8 months ago. So i guess this is for all the others who ask the same question.
I got the trials for this tomorrow.. and I hate ecosystems.