Modern ecology is increasingly recognizing that population dynamics are dependent not only on intra-specific processes, but also on community and larger scaled ecosystem level phenomena. There is likely a tighter interaction between temporal trends in productivity of local populations, communities and ecosystems than was previously accepted by scientists and managers. This has become evident as long-term time series reveal temporal changes in population productivity, range shifts and changes in ecosystem states resulting from several mechanisms including climate, exploitation and migration. My research focuses on understanding population ecology within this framework. Specifically, I seek to quantify both intra- and inter-specific population dynamics and their interaction with broader spatial scales through mechanisms such as climate, migration and food-web interactions.