The department’s ecosystem approach is reflected in the overall division into four academic strengths, which also form the framework for the sections. The strengths are not strictly divided and have much overlap, which is also reflected in the department’s research. The four areas of strength are: Terrestrial ecosystems, Freshwater ecosystems, Marine ecosystems and the Arctic. The latter covers terrestrial, freshwater and marine ecosystems, but focuses on the Arctic and, especially, Greenland.