Marine Atlantic infralittoral mixed sediments
Quick facts
Red List habitat type | code NEAA5.43 |
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Threat status | |
Europe | Data Deficient |
EU | Data Deficient |
Relation to |
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Source | European Red List habitat factsheet |
European Red List of habitats reports | |
European Red List of habitats (Excel table) |
Summary
This habitat comprises mixed (heterogeneous) sediments in fully marine or near fully marine conditions, supporting various animal-dominated communities, with relatively low proportions of seaweeds even though it is an infralittoral habitat. The sediment may include well-mixed muddy gravelly sands or very poorly sorted mosaics of shell, cobbles and pebbles embedded in mud, sand or gravel. Due to the range of the sediment types that support this habitat, the communities may vary considerably, including those characterised by bivalves, polychaetes and file shells. The very varied sediment composition also means that the species diversity and biomass can be high. This has resulted in many species being described as characteristic of this habitat type, but most, in general contribute only a small proportion of the overall similarity. Where the sediment is unstable, most of the fauna are mobile such as hermit crabs, netted dogwhelks and gobies. However, there may also be the dahlia anemones partially buried in the sediments as well as cobbles or pebble with encrustations of keelworrns.
Indicators of Quality:
Both biotic and abiotic indicators have been used to describe marine habitat quality. These include; the presence of particular species, 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
This habitat has a large EOO and AOO, and therefore qualifies as Least Concern under criterion B. However the habitat is assessed as Data Deficient both at the EU 28 and EU 28+ levels because of lack of information on its area and any trends in quantity and quality.
EU | |
Red List Category | Red List Criteria |
Data Deficient |
Europe | |
Red List Category | Red List Criteria |
Data Deficient |
Confidence in the assessment
Pressures and threats
- Biological resource use other than agriculture & forestry
- Fishing and harvesting aquatic resources
- Professional active fishing
- Benthic or demersal trawling
- Pollution
- Marine water pollution
- Toxic chemical discharge from material dumped at sea
- Synthetic compound contamination
- Radionucleide contamination
- Natural System modifications
- Human induced changes in hydraulic conditions
- Removal of sediments (mud...)
- Modification of hydrographic functioning, general
- Dykes, embankments, artificial beaches, general
- Sea defense or coast protection works, tidal barrages
- Climate change
- Changes in biotic conditions
- Migration of species (natural newcomers)
Habitat restoration potential
Trends in extent |
|
Average current trend in quantity |
|
Unknown ![]() |
Unknown ![]() |
EU28 | EU28+ |
Trends in quality |
|
Average current trend in quality |
|
Unknown ![]() |
Unknown ![]() |
EU28 | EU28+ |
Conservation and management needs
List of conservation and management needs
- Measures related to wetland, freshwater and coastal habitats
- Restoring/Improving water quality
- Restoring/Improving the hydrological regime
- Measures related to spatial planning
- Establish protected areas/sites
- Measures related to hunting, taking and fishing and species management
- Regulation/Management of fishery in marine and brackish systems
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) |
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Bay of Biscay and the Iberian Coast | Present | Unknown | Unknown | Unknown |
Celtic Seas | ||||
Greater North Sea | ||||
Macaronesia | ||||
Kattegat |
Extent of Occurrence, Area of Occupancy and habitat area
Extent of Occurrence (EOO) (Km2) | Area of Occupancy (AOO) | Current estimated Total Area | Comment | |
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EU28 | 5,014,877 | 1,015 | >15,885 | The area estimate for this habitat has been derived from a synthesis of EUNIS seabed habitat geospatial information for the European Seas but is recognised as being an underestimate. |
EU28+ | >1,015 | >15,885 | EOO and AOO have been calculated on the available data. Although this data set is known to be incomplete the figures exceed the thresholds for threatened status. |
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 |
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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 | Large shallow inlets and bays | 1160 | Overlap | http://ec.europa.eu/environm...rective/index_en.htm |