My research aims to understand the key processes driving the spatial and temporal dynamics of animal populations, with a particular emphasis on the role of animal movement and the anthropogenic drivers. I study the behaviour, migration patterns, foraging ecology and breeding biology of seabirds as well as their role in marine ecosystems, including their interaction with marine food webs and fisheries. My research continuously intersects with conservation biology, with the threats and challenges faced by seabird populations and I actively work on strategies to conserve and protect these species and their habitats. Our research included observational and experimental field studies, integrating multidisciplinary approaches and tools, such as molecular, stable isotope, physiological, microbiological and contamination analyses. We instrument hundreds of seabirds with different sort of devices, such as GPSs, GLSs, wet-dry sensors and accelerometers, to track their foraging and migratory movements and behaviour. Our tracking data contribute to the identification of several important bird areas at sea (mIBAs) and marine protected areas. It also contributed to the understanding of seabird-fishery interactions in the Atlantic and Mediterranean regions. We also contribute to our understanding on the reversed zoonosis of bacteria in Antarctica, the phylogeny and evolution of seabirds, the migratory strategies of several poorly known seabird species, the impacts of plastic pollution and other contaminants at sea and the impact of fisheries and climate change on the health of marine ecosystems and the political responsibilities for seabird conservation. Our activities also include building capacity in developing countries by training students, technicians and field assistants as well as increasing public awareness on anthropogenic threats to seabirds and to the marine environment. Our main research sites have been the Balearic Islands and the Macaronesic archipelagos, particularly Cape Verde and Canary Islands, as well as some Arctic and Antarctic localities. Long-term studies in ecological research are essential to document key changes in the environment and therefore we have been monitoring some of the study sites for >15 years now. We developed our research in collaboration with a large network of international research collaborations in France, UK, Germany, Portugal, Iceland, Cape Verde, Senegal, South Africa and Chile and with a number of NGOs in Spain and Cabo Verde.