|Basic Information||Biotope classification||Ecology||Habitat preferences and distribution||Species composition||Sensitivity||Importance|
IR.MIR.KR.Ldig.T recorded () and expected () distribution in Britain and Ireland (see below)
To assess the sensitivity of the biotope, the sensitivity of component species is reviewed. Those species that are considered to be particularly indicative of the sensitivity of the biotope, and for which research has been undertaken in detail are shown below (see selection criteria). The biology of other component species of the biotope is also taken into account wherever information is known to the researcher.
|Community Importance||Species name||Common Name|
|Important functional||Halichondria panicea||Breadcrumb sponge|
|Important characterizing||Botryllus schlosseri||Star ascidian|
|Important characterizing||Membranipora membranacea||A bryozoan|
|Important characterizing||Corallina officinalis||Coral weed|
|Important characterizing||Palmaria palmata||Dulse|
|Key Structuring||Laminaria digitata||Oarweed|
|Important Structural||Gibbula cineraria||Grey top shell|
|Important other||Lithophyllum incrustans||An encrusting coralline algae|
Laminaria digitata is the major characterizing species within this biotope and is the most significant component in terms of size and dominance. It provides a substratum for important characterizing species and a habitat and refuge for many others. The breadcrumb sponge Halichondria panicea is likely to compete with and exclude bryozoans and ascidians for space and is therefore considered to be an important functional species. Coral weed Corallina officinalis and dulse Palmaria palmata are frequently found in this biotope where they can be abundant. They are included as they are representative of the associated range of foliose red seaweeds. Membranipora membranacea is the most frequently occurring bryozoan in this biotope and has been used to represent other less commonly occurring bryozoans. The encrusting coralline algae Lithophyllum incrustans has been included as an important 'other' species because, although it is not a characterizing species within this biotope, it represents the encrusting coralline algae that are likely to cover much of the rock in many of the records of MIR.Ldig.T.
The MNCR recorded 425 species in 45 records of this biotope although not all the species occurred in all records of the biotope (JNCC, 1999).
This review can be cited as follows:
Marshall, C.E. 2005. Laminaria digitata, ascidians and bryozoans on tide-swept sublittoral fringe rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 30/09/2014]. Available from: <http://www.marlin.ac.uk/habitatreproduction.php?habitatid=273&code=1997>