EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A7 - Pelagic water column > A7.4 - Partially mixed water column with reduced salinity and medium or long residence time

Partially mixed water column with reduced salinity and medium or long residence time

English name: Partially mixed water column with reduced salinity and medium or long residence time

Description (English)

A water column which is unmixed or only partially mixed because the depth of the water body is greater than the depth of mixing. Salinity is reduced relative to the adjacent fully marine seawater. This habitat type is usually found in deeper coastal water situations and is the result of river inflow or ice melt. Note that some discretion should be used in the interpretation of “adjacent”, for example in the Baltic Sea, “adjacent” fully marine seawater is reached only in the Kattegat. Medium residence time is defined as changing over time preiods greater than daily and up to about 14 days (based on the time required for the phytoplankton population to double) and long residence time lasting longer than 14 days.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type	code A7.4
Relation to	Annex I habitat types (EU Habitats Directive)

Legal status

Relation to other habitat types mentioned in legal instruments

Legal text	Annex	Name in legal text	Code in legal text	Habitat type relationship	More information
Council Directive 92/43/EEC of 21 May 1992 on the conservation of natural habitats and of wild fauna and flora - consolidated version 01/01/2007	Annex I: natural habitat types of community interest whose conservation requires the designation of special areas of conservation	Estuaries	1130	Overlap	http://ec.europa.eu/environm...rective/index_en.htm
Council Directive 92/43/EEC of 21 May 1992 on the conservation of natural habitats and of wild fauna and flora - consolidated version 01/01/2007	Annex I: natural habitat types of community interest whose conservation requires the designation of special areas of conservation	Coastal lagoons	1150	Overlap

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Not available

Other classifications

Classification	Code	Habitat type name	Relationship type
CORINE Land Cover	5.2.3.	Sea and ocean	n/a

For relation to plant communities (syntaxa), see Vegetation types

History

Classification	Code	Habitat type name	Relationship type
EUNIS Habitat Classification 200410	A7.4	Partially mixed water column with reduced salinity and medium or long residence time	same
EUNIS Habitat Classification 200308	A7.4	Partially mixed water column with reduced salinity and medium or long residence time	same
EUNIS Habitat Classification 200202	A7.4	Partially mixed water column with reduced salinity and medium or long residence time	same

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