The main part of my research activities is focused on biodiversity, including functional diversity. This involves the measurement and modelling of biodiversity, issues of spatial and temporal scales, drivers of change, such as, the impact of different types of human activities and climate change, as well as the impact of top predators on other ecosystem components, i.e. cumulative impacts. I am also interested in the potential for reversibility of changes. Much of the research done involves the use of large-scale and/or long-term datasets already collected in scientific surveys or environmental monitoring surveys. I have studied marine biodiversity in different parts of the world in shallow waters, on the continental shelf and in the deep-sea using data on benthos and fish assemblages, including a focus on the High North. Most of my research has been on marine ecosystems, but I am also involved in research related to other ecosystems. I am also focusing on environmental monitoring and study/sampling design. The work implies many national and international collaborations, e.g. with scientists from Europe, New Zealand, Canada, and Australia.