Biocenosis of Mediterranean upper mediolittoral rock
The distribution and type of the populations of the solid substratum in the mediolittoral stage are profoundly affected by the submersion variability due to waves and to the irregular rise in the sea level caused by atmospheric pressure and wind. Two horizons corresponding to different average values of the dominant factors (humectation, light, nutrients, topography and type of substratum) can be made out. The upper horizon corresponds to the area that is only moistened by the tops of the waves and spray. The upper mediolittoral which corresponds to this habitat is the horizon where the environmental conditions are most restrictive. According to the hydrodynamics and the local topography, it can extend over a vertical area of a few centimeters to two meters.
Variations in the environmental conditions affect the vertical extension of the biocenosis of the upper mediolittoral rock, and also the density of its cover and its dominant composition. This habitat also varies according to the nature of the substratum. Development of endolithic Cyanobacteria (=Cyanophyceae) is intense on the calcareous coasts.
A certain number of facies which may appear as belts can be made out (See facies and associations).
Source: EUNIS habitat classification
|EUNIS habitat type||code MA153|
|Relation to||Resolution 4 habitat type (used for designation of Emerald sites)|
Relation to other habitat types mentioned in legal instruments
Relation to vegetation types (syntaxa)Not available
Species mentioned in habitat description
|Classification||Code||Habitat type name||Relationship type|
|EUNIS Habitat Classification 2007 (revised descriptions 2012)||A1.13||Mediterranean and Black Sea communities of upper mediolittoral rock||same|
|European Red List of Habitats||MEDA1.13||Communities of Mediterranean upper mediolittoral rock||same|
|European Red List of Habitats||MEDA1.41||Communities of Mediterranean mediolittoral rockpools||same|
|Classification||Code||Habitat type name||Relationship type||Comment|
|EUNIS Habitat Classification 200410||A1.13||Mediterranean communities of upper mediolittoral rock||same|
|EUNIS Habitat Classification 200308||A1.13||Mediterranean communities of the upper mediolittoral rock||same|
|EUNIS Habitat Classification 200202||A1.13||Communities of the upper mediolittoral rock||same|
|EUNIS Habitat Classification 199910||A1.13||Biocenosis of the upper mediolittoral rock||same|