Invertebrate-dominated Marmara circalittoral rock
Quick facts
| Red List habitat type | code BLSA4.AA |
|---|---|
| Threat status | |
| Europe | Data Deficient |
| EU | n/a |
| Relation to |
|
| Source | European Red List habitat factsheet |
| European Red List of habitats reports | |
| European Red List of habitats (Excel table) |
Summary
Circalittoral rock starts at the lower limit of distribution of photophilic algae. In the Sea of Maramara a number of unique communities occur due to the high organic load characteristic of this region. In the upper levels (10-30 m) of outflowing Black Sea waters a thick layer of Ophiurids occurs. In the lower levels (30-50 m) of inflowing Mediterranean waters a thick layer of Crinoids occurs. Throughout all depths (2 – 60m) a fragile layer of tubeworms (Serpulid polychaetes) can be found attached to rock faces.
Indicators of quality:
Both biotic and abiotic indicators have been used to describe marine habitat quality. These include: the presence of characteristic species and those which are sensitive to the pressures the habitat may face, water quality parameters, levels of exposure to particular pressure as well as and more integrated indices which describe habitat structure and function, such as trophic index, or successional stages of development in habitats that have a natural cycle of change over time. There are no commonly agreed indicators of quality for this habitat, although particular parameters may have been set in certain situations e.g. protected features within Natura 2000 sites, where reference values have been determined and applied on a location-specific basis.
Threat status
Synthesis of Red List assessment
| EU | |
| Red List Category | Red List Criteria |
| n/a | - |
| Europe | |
| Red List Category | Red List Criteria |
| Data Deficient | - |
Confidence in the assessment
Pressures and threats
- No threats or pressures
- No threats or pressures
Habitat restoration potential
Trends in extent |
|
Average current trend in quantity |
|
No occurrence  |
Unknown  |
| EU28 | EU28+ |
Trends in quality |
|
Average current trend in quality |
|
| No occurrence |
Unknown |
| EU28 | EU28+ |
Conservation and management needs
List of conservation and management needs
- No measures
- No measure known / impossible to carry out specific measures
Distribution
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) |
|---|---|---|---|---|
| Sea of Marmara | Present | Unknown | Unknown | Unknown |
Extent of Occurrence, Area of Occupancy and habitat area
| Extent of Occurrence (EOO) (Km2) | Area of Occupancy (AOO) | Current estimated Total Area | Comment | |
|---|---|---|---|---|
| EU28 | N/A | N/A | N/A | This habitat is only present in the Sea of Marmara therefore it does not occur in the EU28 |
| EU28+ | Unknown | Unknown | The habitat is known to occur in the Black Sea but there is insufficient data to accurately calculate EOO and AOO. |
EOO = the area (km2) of the envelope around all occurrences of a habitat (calculated by a minimum convex polygon).
Characteristic species
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 | Reefs | 1170 | Overlap | http://ec.europa.eu/environm...rective/index_en.htm |
