Natural dystrophic lakes and ponds
Standing waters where the water is brown in colour owing to inputs of humic acids (lakes, bog hollows, lagg zone, etc.) generally on peaty substrates or in contact to peaty substrates in bogs, peaty heathlands etc. that are usually highly acidic.
The European Commission has clarified that - depending on the definition of the term 'natural' - this habitat type may be primary or secondary (e.g. ponds) if its occurrences are subject to (semi-)natural development.
Notes on habitat mapping
The criterion for assignment to this habitat type is the dystrophic character of the lake or pond. This is visible from the brown colour of the water owing to the high content of humic acids. Submerse vegetation may be present or absent.
Artificial man-made waters such as fresh peat cutting banks or drainage ditches are excluded. Secondary waters subject to natural development, such as peat cutting banks which were left open, are included. This habitat type is characterized by continuous presence of water and a water depth of generally over 20 (40) cm and is thus differentiated from pools in raised bogs (7110, 7120) or transitional bogs (7140). Where Rhynchospora spp. dominate in depressions with hardly any open water, this can be assigned to the habitat type 'depressions on peat substrates of the Rhynchosporion (7150).
Comments
The name should be changed to 'Dystrophic standing waters'.