The importance of microclimate and catchment properties on the biodiversity of subarctic aquatic ecosystems – endangered ecosystems under changeClimate warming is particularly pronounced in the northern regions, where many unique aquatic ecosystems are adapted to the cold and harsh conditions and are thus threatened. This study examines and models how the differences in microclimatic conditions affect the water temperature of the ponds, the catchment area characteristics and ecosystems even at a small spatial scale. The study also aims to create a monitoring method, which helps to anticipate the consequences of climate change in aquatic ecosystems.