Lakes of gypsum karst

Description (English)

Small permanent lakes that have developed in springs or spring complexes of active gypsum karst areas. These water bodies are characterised by large fluctuations of water level (up to 2.5 m) which is related with the level of the underlying water table and amount of precipitation. Maximum depth of the pools does not exceed 7 m, but the stratification is well-expressed. Intensive gypsum solution leads to high saturation of Ca++ and SO4-- ions in water. The unusual conditions allow unique colonies and mats of green and purple sulphurous bacteria to develop in the lakes. Communities of Charetea, Lemnetea and Potamogetonion are the dominant elements of the water vegetation.

Source: Interpretation Manual of European Union Habitats, version EUR 28 (2013)

Quick facts

EU Habitats Directive Annex I habitat type (code 3190)
EU conservation status by biogeographical region Alpine - Favourable
Boreal - Unknown
Continental - Unfavourable-Inadequate
Habitat type Not priority
Natura 2000 sites 17 are designated for this habitat type

Distribution

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Conservation status

EU conservation status

Conservation status assesses every six years and for each biogeographical region the condition of habitats and species compared to the favourable status as described in the Habitats Directive. The map shows the 2007-2012 assessments as reported by EU Member State. Assessments are further detailed in the summary document available behind the link below.

Favourable: A habitat is in a situation where it is prospering and with good prospects to do so in the future as well
Unfavourable-Inadequate: A habitat is in a situation where a change in management or policy is required to return the habitat to favourable status but there is no danger of disappearance in the foreseeable future
Unfavourable-Bad: A habitat is in serious danger of disappearing (at least regionally)
Unknown: The information available for the habitat type is scarce and does not allow a proper assessment of its conservation status

Species mentioned in habitat description

Flowering Plants Ceratophyllum demersum
Flowering Plants Lemna trisulca
Flowering Plants Potamogeton lucens
Flowering Plants Potamogeton pectinatus
Flowering Plants Schoenoplectus lacustris
Flowering Plants Sparganium erectum
Mosses & Liverworts Warnstorfia exannulata
Species scientific name English common name Species group
Ceratophyllum demersum Flowering Plants
Lemna trisulca Flowering Plants
Potamogeton lucens Flowering Plants
Potamogeton pectinatus Flowering Plants
Schoenoplectus lacustris Flowering Plants
Sparganium erectum Flowering Plants
Warnstorfia exannulata Mosses & Liverworts

Natura 2000 sites

Protected sites

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Relation to habitat classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200711 C1.2 Permanent mesotrophic lakes, ponds and pools narrower
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