|Basic Information||Biotope classification||Ecology||Habitat preferences and distribution||Species composition||Sensitivity||Importance|
Image Rohan Holt - Halidrys on flat pebbles and gravel. Image width ca 1 m.
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IR.MIR.SedK.HalXK 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 characterizing||Halidrys siliquosa||Sea oak|
|Important structural||Delesseria sanguinea||Sea beech|
|Important structural||Chondrus crispus||Carragheen|
|Important structural||Furcellaria lumbricalis||A red seaweed|
|Important structural||Saccharina latissima||Sugar kelp|
|Important structural||Botryllus schlosseri||Star ascidian|
|Important structural||Aglaophenia pluma||A hydroid|
This biotope is characterized by the abundance of Halidrys siliquosa, without which the biotope would not be recognised. Laminarians may also be present, the exact species varying with location. Therefore, Saccharina latissima has been chosen to represent their sensitivity. Similarly, the community is composed of silt tolerant red algae species, therefore, Chondrus crispus, Furcellaria lumbricalis, and Delesseria sanguinea have been included as important structural to represent red algal species. The biotope also contains a diverse epiphytic fauna, especially on Halidrys siliquosa, which are characteristic of tidally swept conditions. Therefore, Botryllus schlosseri and has been included as important structural to represent their sensitivity. Reference was made to Nemertesia ramosa to represent hydroids.
The MNCR recorded ca 734 species within this biotope, although not all species occurred in all records of the biotope. Halidrys siliquosa dominated communities are also described by Lewis (1964) and additional records provided by Dixon et al. (1978).
This review can be cited as follows:
Tyler-Walters, H. 2002. Halidrys siliquosa and mixed kelps on tide-swept infralittoral rock with coarse sediment.. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 03/09/2014]. Available from: <http://www.marlin.ac.uk/habitatreproduction.php?habitatid=258&code=1997>