The purpose of the BioBasis programme is to monitor basic qualitative and quantitative elements of biodiversity in the terrestrial ecosystems at Zackenberg in Northeast Greenland. The programme provides data on typical High Arctic species and processes that can be expected to react on year to year variation in climate as well as long-term climate change. It includes 30 variables of terrestrial and limnic plant, arthropod, bird and mammal dynamics in the Zackenberg valley.