Spatial heterogeneity and density dependent processes can play an important role in regulating populations. This thesis investigates spatial processes and mechanisms that influence population dynamics using an intensively monitored reintroduced population of the Mauritius kestrel Falco punctatus as a model system. This 19 year dataset is particularly suited as a closed system with no recorded emigration or immigration, and with most individuals uniquely marked. This provides complete individual life histories from a population that has experienced low population densities before stabilising at approximately 40 pairs since the mid 1990s.