|Basic Information||Biotope classification||Ecology||Habitat preferences and distribution||Species composition||Sensitivity||Importance|
Image Keith Hiscock - Himanthalia elongata and Laminaria digitata on lower shore bedrock. Image width ca XX cm.
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LR.HLR.FR.Him recorded () and expected () distribution in Britain and Ireland (see below)
For a list of 2004 characterising species please see the JNCC website.
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||Himanthalia elongata||Thongweed|
|Important characterizing||Palmaria palmata||Dulse|
|Important characterizing||Chondrus crispus||Carragheen|
|Important characterizing||Corallina officinalis||Coral weed|
|Important characterizing||Patella vulgata||Common limpet|
|Important characterizing||Semibalanus balanoides||An acorn barnacle|
|Important other||Nucella lapillus||Dog whelk|
|Important other||Mytilus edulis||Common mussel|
Himanthalia elongata is the characterizing brown algae in this biotope as it is more tolerant of wave exposure than Fucus serratus, which would otherwise form a patchy but often dense canopy amongst red algal turfs in the lower eulittoral zone. A turf of red foliose and encrusting algae is particularly characteristic of this biotope and Palmaria palmata and Chondrus crispus are included as important characterizing species representative of themselves and other foliose red algae, such as Mastocarpus stellatus. Corallina officinalis is included as a representative of turf forming calcareous species. Semibalanus balanoides and Patella vulgata are species which typically colonize patches occurring in the turf. Species such as Nucella lapillus, Littorina neglecta and Mytilus edulis are not especially faithful to the biotope but may occasionally occur in the biotope, exploiting damp pits and crevices in the rock, their presence therefore may have some bearing on the sensitivity of the biotope and are included as important others.
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This review can be cited as follows:
Budd, G.C. 2002. Himanthalia elongata and red seaweeds on exposed lower eulittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 28/11/2014]. Available from: <http://www.marlin.ac.uk/habitatreproduction.php?habitatid=360&code=2004>