The lakes with a low trophic level represent one of the natural habitats in the Danube’s Delta. This habitat is composed of terminal lakes found at the end of canals.
These lakes are surrounded by reed beds and other vegetation. Their water is very clean and it has a low trophic level.
Due to the vegetation boom existent during spring and autumn, the delta ecosystem receives a significant amount of nitrogen and phosphorus.
The locals named the eutrophication process ‘înflorirea apei’ (tr. n. ‘the blossoming of the water’), due to the fact that the water turns yellowish-green.
After a few months, the vegetation submerges and decomposes on the bottom of the lakes. The release of hydrogen sulphide purifies the water.
Examples of this kind of habitat are the isolated lakes in Govora, the Lake with swans, Gorgovat and Gorgovel Lakes.
The Somova Parcheș Complex is an example of anthropic intervention in this type of habitat.
This complex is isolated from the Danube’s canals and the water level is controlled. The water is decanted and the lakes become microbiologically pure.