Sabellaria alveolata reefs on sand-abraded eulittoral rock
Quick facts
EUNIS habitat type | code MA2261 |
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Relation to | Annex I habitat types (EU Habitats Directive) |
Description (English)
Exposed to moderately exposed bedrock and boulders in the eastern basin of the Irish Sea (and as far south as Cornwall) characterised by reefs of the polychaete Sabellaria alveolata. The sand based tubes formed by S. alveolata form large reef-like hummocks, which serve to stabilise the boulders and cobbles. Other species in this biotope include the barnacles Semibalanus balanoides and Elminius modestus and the limpet Patella vulgata, the winkle Littorina littorea, the mussel Mytilus edulis and the whelk Nucella lapillus. The anemone Actinia equina and the crab Carcinus maenas can be present in cracks and crevices on the reef. Low abundance of seaweeds tend to occur in areas of eroded reef. The seaweed diversity can be high and may include the foliose red seaweeds Palmaria palmata, Mastocarpus stellatus, Osmundea pinnatifida, Chondrus crispus and some filamentous species e.g. Polysiphonia spp. and Ceramium spp. Coralline crusts can occur in patches. Wracks such as Fucus vesiculosus, Fucus serratus and the brown seaweed Cladostephus spongiosus may occur along with the ephemeral green seaweeds Enteromorpha intestinalis and Ulva lactuca. On exposed surf beaches in the south-west S. alveolata forms a crust on the rocks, rather than the classic honeycomb reef form, and may be accompanied by the barnacle Balanus perforatus (typically common to abundant). On wave-exposed shores in Ireland, the wrack Himanthalia elongata can also occur.
Situation: Above this unit are biotopes dominated either by ephemeral seaweeds, such as Enteromorpha spp. and Porphyra spp. or the perennial wrack Fucus vesiculosus on mixed substrata (units MA1-243; MA1-23D2; MA4-211; MA1-23H). Rockpool biotopes dominated by the red seaweed Corallina officinalis (unit MA1-262), by wracks such as Fucus spp. or by kelp such as Laminaria spp. (MA1-263) can usually be found above this biotope. Beneath this biotope is a community consisting of mixed scour-tolerant like the kelp Laminaria digitata and opportunistic foliose red seaweeds such as Polyides rotundus and Ahnfeltia plicata (units MB1-2171; MB1-235; A1.45;MB1-237). In adjacent sediment areas Lanice conchilega may dominante (MA5-255).
Temporal variation: These reefs may be susceptible to storm damage in the winter, although they can regenerate remarkably quickly in a season as long as some adults are left as they facilitate the larval settlement. S. alveolata is tolerant to burial under sand for several weeks. Changes in desiccation over a period of time can cause part of the population to die.
Source: EUNIS habitat classification
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 | Narrower | http://ec.europa.eu/environm...rective/index_en.htm |
Vegetation types
Relation to vegetation types (syntaxa)
Not availableSpecies mentioned in habitat description
Species scientific name | English common name | Species group |
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Cladostephus spongiosus | Algae | |
Corallina officinalis | Algae | |
Enteromorpha intestinalis | Algae | |
Fucus serratus | Algae | |
Fucus vesiculosus | Algae | |
Ulva lactuca | Algae | |
Actinia equina | Invertebrates | |
Balanus perforatus | Invertebrates | |
Carcinus maenas | Invertebrates | |
Lanice conchilega | Invertebrates | |
Mytilus edulis | Invertebrates | |
Nucella lapillus | Dog whelk | Invertebrates |
Patella vulgata | Invertebrates | |
Sabellaria alveolata | Invertebrates |
Other classifications
Classification | Code | Habitat type name | Relationship type |
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EUNIS Habitat Classification 2007 (revised descriptions 2012) | A2.711 | Sabellaria alveolata reefs on sand-abraded eulittoral rock | same |
History
Classification | Code | Habitat type name | Relationship type | Comment |
---|---|---|---|---|
EUNIS Habitat Classification 200410 | A2.711 | Sabellaria alveolata reefs on sand-abraded eulittoral rock | same | |
EUNIS Habitat Classification 200308 | A1.261 | Sabellaria alveolata reefs on sand-abraded eulittoral rock | same | |
EUNIS Habitat Classification 200202 | A1.261 | Sabellaria alveolata reefs on sand-abraded eulittoral rock | same | |
EUNIS Habitat Classification 199910 | A1.251 | Sabellaria alveolata reefs on sand-abraded eulittoral rock | same | |
MNCR BioMar 97.06 (Britain & Ireland) | MLR.Sab.Salv | Sabellaria alveolata reefs on sand-abraded eulittoral rock | same |