Laminaria digitata, ascidians and bryozoans on tide-swept sublittoral fringe rock

English name: Laminaria digitata, ascidians and bryozoans on tide-swept sublittoral fringe rock

Quick facts

EUNIS habitat type code A3.221
Bern Convention Included in a Resolution 4 habitat type at a higher level (A3)

Description (English)

Sheltered bedrock, boulders and cobbles that are subject to moderate to strong tidal water movement characterised by dense Laminaria digitata, coralline crusts and sponges such as Halichondria panicea. Other seaweeds present include the foliose red seaweeds Chondrus crispus, Palmaria palmata, Cryptopleura ramosa and Mastocarpus stellatus as well as the calcareous Corallina officinalis. Green seaweeds present include Ulva lactuca, Enteromorpha intestinalis and Cladophora rupestris. The increased water movement encourages several filter-feeding faunal groups to occur. The sponges Leucosolenia spp., Scypha ciliata and Hymeniacidon perleve frequently occur on steep and overhanging rock faces. The bryozoans Electra pilosa, Membranoptera membranipora and Alcyonidium hirsutum encrust the kelp and other foliose seaweeds. In addition, ascidians such as Ascidiella scabra, Dendrodoa grossularia and colonial ascidians Botryllus byssoides and Botryllus leachi often thrive in this environment encrusting both the rock and the seaweeds. The tube-building polychaete Pomatoceros triqueter can be found on the rock and on the kelp holdfasts along with the barnacle Balanus crenatus. More mobile species such as the gastropods Gibbula cineraria and Calliostoma zizyphinum, the crab Carcinus maenas and the starfish Asterias rubens are also common. Areas where increased tidal movement influences this community can be found in the narrows and/or intertidal sills of sealochs.
Situation: This biotope often occurs immediately below the tide-swept Fucus serratus biotope (unit A1.152) consequently, some F. serratus may occur in this biotope (typically only Occasional). The sublittoral fringe of similarly sheltered shores that are not tide-swept are generally characterised by mixed Laminaria saccharina and L. digitata (unit A3.3131) or L. saccharina (A3.313). Below A3.221, at these sheltered, tide-swept sites, a canopy of mixed kelp species often occurs (see units A3.222 and XKTX).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Chondrus crispus
Algae Cladophora rupestris
Algae Corallina officinalis
Algae Cryptopleura ramosa
Algae Fucus serratus
Algae Laminaria digitata
Algae Laminaria saccharina
Algae Mastocarpus stellatus
Algae Palmaria palmata
Algae Ulva lactuca
Invertebrates Alcyonidium hirsutum
Invertebrates Ascidiella scabra
Invertebrates Asterias rubens
Invertebrates Balanus crenatus
Invertebrates Botryllus leachi
Invertebrates Calliostoma zizyphinum
Invertebrates Carcinus maenas
Invertebrates Dendrodoa grossularia
Invertebrates Electra pilosa
Invertebrates Gibbula cineraria
Invertebrates Halichondria panicea
Invertebrates Pomatoceros triqueter
Species scientific name English common name Species group
Chondrus crispus Algae
Cladophora rupestris Algae
Corallina officinalis Algae
Cryptopleura ramosa Algae
Fucus serratus Algae
Laminaria digitata Algae
Laminaria saccharina Algae
Mastocarpus stellatus Algae
Palmaria palmata Algae
Ulva lactuca Algae
Alcyonidium hirsutum Invertebrates
Ascidiella scabra Invertebrates
Asterias rubens Invertebrates
Balanus crenatus Invertebrates
Botryllus leachi Invertebrates
Calliostoma zizyphinum Invertebrates
Carcinus maenas Invertebrates
Dendrodoa grossularia Invertebrates
Electra pilosa Invertebrates
Gibbula cineraria Invertebrates
Halichondria panicea Invertebrates
Pomatoceros triqueter Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 IR.MIR.KT.LdigT <I>Laminaria digitata</I>, ascidians and bryozoans on tide-swept sublittoral fringe rock source
CORINE Land Cover 5.2.3. Sea and ocean n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A3.221 Laminaria digitata, ascidians and bryozoans on tide-swept sublittoral fringe rock same
EUNIS Habitat Classification 200308 A3.2112 Laminaria digitata, ascidians and bryozoans on tide-swept sublittoral fringe rock same
EUNIS Habitat Classification 200202 A3.2112 Laminaria digitata, ascidians and bryozoans on tide-swept sublittoral fringe rock same
EUNIS Habitat Classification 199910 A3.2112 Laminaria digitata, ascidians and bryozoans on tide-swept sublittoral fringe rock same
MNCR BioMar 97.06 (Britain & Ireland) MIR.KR.Ldig.T Laminaria digitata, ascidians and bryozoans on tide-swept sublittoral fringe rock same
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