the slowdown of both speciation and extinction rates. It has also demonstrated the importance of tree cover for buffering soil erosion during times of climate change and provided insight into the composition of regional flora through glacial and inter-glacial periods. Human influence Shore habitats are under particular pressure from human activities. Particular threats are the building of tourist facilities directly at the shore, destroying of reed belts to gain agricultural land and intense pollution close to the mouth of tributaries. Although the effects of these human impacts have not been evaluated in detail they are of great concern, as the shallow water sites are particularly rich in endemic bottom fauna and form important spawning grounds for several endemic fish species. Moreover, reed belts have great importance for water birds. Commercial fish yield, i.e. the two endemic trout species, has dropped significantly over the past decades, both in North Macedonia and in Albania. The most probable reason is overfishing and possibly destruction of spawning grounds. Pollution may also be a factor. Although there are regulations regarding fishing practice (e.g. minimal mesh size) and only a limited number of licensed fishermen, these rules are always not obeyed as a result of the high market value of the endemic trout. As a reaction to the situation, a seven-year moratorium on fishing Ohrid trout was imposed from 2004 to help the population recover and to allow scientists collect further data. Nonetheless, even though thorough assessment of fish stocks has not been conducted since the 1990s and trout populations are still believed to be in decline, fishing with quotas was restarted in 2012 under the auspices of a concessionaire. More data is required to determine whether these current fishing levels are sustainable and illegal fishing, particularly on the Albanian side of the lake, remains a problem. While most of the endemic fish species are non-migratory, the European eel spawns in the distant Sargasso Sea while its offspring return to the lake. Unfortunately, as in many European lakes, it is very unlikely today that eels can reach Lake Ohrid naturally and return to the Sargasso Sea, as a result of several hydropower dams on the Black Drin and the Drin River, both in North Macedonia and Albania. As a result, eel found in Lake Ohrid are stocked populations. Given the population growth over the past 50 years, a particular concern is the potential eutrophication of currently