I would like to thank my parents and sister for providing support in so many ways. In particular, for financing my course.
I would like to thank John Marshall, for useful comments about modelling.
I would also like to thank the following people for listening to my questions and providing useful answers:
Finally, I would like to thank the staff and my fellow students in the Ecosystems Analysis and Management Group for providing a stimulating and thought provoking environment in which to study.