My research primarily focuses on wild populations of long-lived birds and their responses to changes in marine and terrestrial ecosystems, including: Population responses to historic and recent changes in climate: foraging and diet, using direct methods (diet analyses, radio tracking, data logger technology) as well as non-invasive methods (stable isotope analysis, fatty acid signatures): molecular ecology and speciation (seabirds and parrots). Behavioural ecology: Studies on parent-offspring interactions as honest signalling systems, and regulation of trade-offs in response to variable environmental conditions: Field endocrinology and immunology. As early as my undergraduate studies, I was interested in the responses of individuals to environmental conditions and climate change, especially in the extreme environments of the South Atlantic Ocean and Antarctica. I conduct research on tubenosed seabirds (e.g. storm-petrels and prions), parrots, waterfowl, and more recently, penguins and cormorants. A further focus of my work is to contribute scientific data to enable more effective conservation of species and ecosystems. I initiated and co-ordinated several projects (see below), and developed them to long-term monitoring sites.