EUNIS habitat classification 2012 > A - Marine habitats > A1 - Littoral rock and other hard substrata > A1.2 - Moderate energy littoral rock > A1.21 - Barnacles and fucoids on moderately exposed shores

Barnacles and fucoids on moderately exposed shores

English name: Barnacles and fucoids on moderately exposed shores

Quick facts

EUNIS habitat type code A1.21

Description (English)

Moderately exposed rocky shores characterised by a mosaic of fucoids and barnacles on bedrock and boulders, where the extent of the fucoid cover is typically less than the blanket cover associated with sheltered shores. Other species are normally present as well in this habtat including the winkle Littorina littorea, the whelk Nucella lapillus and the red seaweed Mastocarpus stellatus. Beneath the band of yellow and grey lichens at the top of the shore is a zone dominated by the wrack Pelvetia canaliculata, scattered barnacles, while the black lichen Verrucaria maura covers the rock surface (A1.211). Below, on the mid shore the wrack Fucus vesiculosus generally forms a mosaic with the barnacle Semibalanus balanoides and the limpet Patella vulgata (A1.213). Finally, the wrack Fucus serratus, dominates the lower shore, while a variety of red seaweeds can be found underneath theF. serratus canopy (A1.214). A number of variants have been described: lower shore bedrock and boulders characterised by mosaics of F. serratus and turf-forming red seaweeds (A1.2141); where the density of F. serratus is greater (typically Common - Superabundant) and the abundance of red seaweeds less A1.3151 should be recorded. The presence of boulders and cobbles on the shore can increase the micro-habitat diversity, which often results in a greater species richness. Although the upper surface of the boulders may bear very similar communities to A1.3151 there is often an increase in fauna (crabs, tube-forming polychaetes, sponges and bryozoans) and A1.2142 should be recorded. Sand-influenced exposed to moderately exposed lower shore rock can be characterised by dense mats of Rhodothamniella floridula (A1.215).
Situation: Mid and lower eulittoral moderately exposed bedrock with a lichen zone above and a kelp dominated community below in the sublittoral zone.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Fucus serratus
Algae Fucus vesiculosus
Invertebrates Littorina littorea
Algae Mastocarpus stellatus
Invertebrates Nucella lapillus
Invertebrates Patella vulgata
Algae Pelvetia canaliculata
Algae Rhodothamniella floridula
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Fucus serratus Algae
Fucus vesiculosus Algae
Littorina littorea Invertebrates
Mastocarpus stellatus Algae
Nucella lapillus Dog whelk Invertebrates
Patella vulgata Invertebrates
Pelvetia canaliculata Algae
Rhodothamniella floridula Algae
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.MLR.BF Barnacles and fucoids on moderately exposed shores source
CORINE Land Cover 4.2.3. Intertidal flats n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A1.21 Barnacles and fucoids on moderately exposed shores same
EUNIS Habitat Classification 200308 A1.22 Barnacles and fucoids on moderate energy shores same
EUNIS Habitat Classification 200202 A1.22 Fucoids and barnacles on moderately exposed littoral rock same
EUNIS Habitat Classification 199910 A1.21 Fucoids and barnacles on moderately exposed littoral rock same
EUNIS Habitat Classification 199811 A1.21 Fucoids, barnacles and limpets on moderately exposed rock same
EUNIS Habitat Classification 199712 A1.31 Fucoids, barnacles and limpets on moderately exposed rock same
MNCR BioMar 97.06 (Britain & Ireland) MLR.BF Barnacles and fucoids (moderately exposed shores) same
MNCR BioMar 96.7 (Britain & Ireland) MLR.FB   same
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