Red List habitat classification > RL - Marine habitats > RLBLS - Black Sea > BLSA1.21 Turf algae on Pontic moderately exposed lower mediolittoral rock

Turf algae on Pontic moderately exposed lower mediolittoral rock

Quick facts

Red List habitat type code BLSA1.21
Threat status
Europe Least Concerned
EU Endangered
Relation to
Source European Red List habitat factsheet
European Red List of habitats reports
European Red List of habitats (Excel table)

Summary

Moderately exposed bedrock and boulders in the lower mediolittoral zone with a cover of algal turf. High and constant humidity, strong wave action and strong light are the dominant environmental factors for this habitat. In the Black Sea lower mediolittoral rock is a narrow zone located in the lower part of the swash zone and is covered by water most of the time. The habitat is found on rocky coasts in relatively pristine conditions.

Indicators of quality:

There are no known commonly agreed indicators of quality for this habitat, although particular parameters may be set in certain situations, e.g. protected features with Natura 2000 sites, where reference values may have been determined and applied on a location-specific basis. Some potential indicators of quality for this specifc habitat are the cover of corallines (erect and crustose; >80%), height of erect corallines (>25 mm), lack of ephemeral green and red algae and cyanobacteria.

Characteristic species
For full habitat description, please download the habitat factsheet.

Threat status

Synthesis of Red List assessment

This habitat has a limited geographical range within the Black Sea EU 28 countries, and has been subject to declines in quantity and this trend is considered likely to continue within the next 20 years.
This habitat has therefore been assessed as Endangered for the EU 28. Because of the wide geographical distribution in the Black Sea it has been assessed as Least Concern for the EU 28+.
There is insufficient data to asses this habitat based on other criteria.
EU
Red List Category Red List Criteria
Endangered B1b
Europe
Red List Category Red List Criteria
Least Concerned -

Confidence in the assessment

low
Red List of habitat categories and criteria descriptions

Pressures and threats

  • Urbanisation, residential and commercial development
    • Urbanised areas, human habitation
  • Biological resource use other than agriculture & forestry
    • Fishing and harvesting aquatic resources
  • Pollution
    • Pollution to surface waters (limnic, terrestrial, marine & brackish)
    • Nutrient enrichment (N, P, organic matter)
  • Natural System modifications
    • Siltation rate changes, dumping, depositing of dredged deposits

Habitat restoration potential

The habitat can recover naturally providing suitable substrate is present. However, there is no knowledge of the time required for recovery to take place.

Trends in extent

Average current trend in quantity

Unknown Unknown
EU28 EU28+

Trends in quality

Average current trend in quality

Stable Stable
EU28 EU28+

Conservation and management needs

The habitat is protected within MPAs and Natura2000 sites in Romania and Bulgaria. In Romania Natura2000 sites have been designated specifically to protect this habitat.
In the future more protected areas should be designated to protect the habitat. This can be supported by restrictions on coastal developments and efforts to improve water quality (especially in non-EU states).

List of conservation and management needs

  • Measures related to marine habitats
    • Other marine-related measures
  • Measures related to spatial planning
    • Other marine-related measures
    • Establish protected areas/sites
    • Legal protection of habitats and species
  • Measures related to special resouce use
    • Regulating/Managing exploitation of natural resources on sea

Distribution

For each habitat a distribution map was produced from a wide variety of sources indicating known and potential occurrences of the habitat in 10x10 km grids within Europe. Occurrences in grid cells were given in two classes: actual distribution from relatively reliable sources (surveys, expert knowledge), and potential distribution based on models or less reliable indicators. Please download the fact sheet to see the map.

Geographic occurrence and trends

Seas Present or presence uncertain Current area of habitat (Km2) Recent trend in quantity (last 50 years) Recent trend in quality (last 50 years)
Black Sea Present Unknown Unknown Unknown
Sea of Marmara

Extent of Occurrence, Area of Occupancy and habitat area

Extent of Occurrence (EOO) (Km2) Area of Occupancy (AOO) Current estimated Total Area Comment
EU28 10,743 25 Unknown Area estimates are available at some localities. These are a small proportion of the total area. It is possible to infer presence based on certain conditions. However, the total area is unknown.
EU28+ 187 Unknown Area estimates are available at some localities. These are a small proportion of the total area. It is possible to infer presence based on certain conditions. However, the total area is unknown.
AOO = the area occupied by a habitat measured in number of 10x10 km grid cells.
EOO = the area (km2) of the envelope around all occurrences of a habitat (calculated by a minimum convex polygon).

Characteristic species

The full list of characteristic species and genus are available above from the Summary. The species available in the EUNIS database are shown here.
Algae Cladophora laetevirens
Algae Cladophora vagabunda
Algae Corallina officinalis
Algae Lithophyllum incrustans
Algae Porphyra leucosticta
Algae Scytosiphon lomentaria
Algae Ulothrix flacca
Algae Ulva rigida
Invertebrates Ampithoe ramondi
Invertebrates Balanus improvisus
Invertebrates Eriphia verrucosa
Invertebrates Hyale pontica
Invertebrates Idotea balthica
Invertebrates Mytilaster lineatus
Invertebrates Mytilus galloprovincialis
Invertebrates Pachygrapsus marmoratus
Invertebrates Patella caerulea
Species scientific name English common name Species group
Cladophora laetevirens Algae
Cladophora vagabunda Algae
Corallina officinalis Algae
Lithophyllum incrustans Algae
Porphyra leucosticta Algae
Scytosiphon lomentaria Algae
Ulothrix flacca Algae
Ulva rigida Algae
Ampithoe ramondi Invertebrates
Balanus improvisus Invertebrates
Eriphia verrucosa Invertebrates
Hyale pontica Invertebrates
Idotea balthica Invertebrates
Mytilaster lineatus Invertebrates
Mytilus galloprovincialis Invertebrates
Pachygrapsus marmoratus Invertebrates
Patella caerulea Invertebrates

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Other classifications

Not available
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