Laminaria digitata and under-boulder fauna on sublittoral fringe boulders

English name: Laminaria digitata and under-boulder fauna on sublittoral fringe boulders

Quick facts

EUNIS habitat type code A3.2112
Bern Convention Included in a Resolution 4 habitat type at a higher level (A3)

Description (English)

This Laminaria digitata biotope is found predominantly on moderately exposed boulder shores and occasionally also on exposed or sheltered shores. Upper surfaces of the boulders are colonised by dense L. digitata though other kelp such as Laminaria hyperborea and Laminaria saccharina or the wrack Fucus serratus can be present at lower abundance. The kelp fronds can be colonised by the bryozoan Membranipora membranacea. Beneath the kelp canopy are a variety of red seaweeds such as Mastocarpus stellatus, Chondrus crispus, Palmaria palmata, Membranoptera alata, Corallina officinalis and coralline crusts. Green seaweeds include Cladophora rupestris and Ulva lactuca. Where space is available beneath the boulders (i.e. they are not buried in sediment) there may be a rich assemblage of animals. Characteristic species include the crabs Porcellana platycheles, Pisidia longicornis and juvenile Cancer pagurus. Also present beneath the boulders are often high densities of the barnacle Balanus crenatus, the tube-building polychaete Pomatoceros triqueter, spirorbid worms, the polychaete Harmotho‰ sp., gammarid amphipods and a few gastropods such as Gibbula cineraria. The encrusting bryozoans Electra pilosa and Umbonula littoralis and encrusting colonies of the sponges Halichondria panicea and Halisarca dujardini are also typical of this habitat. The richest examples also contain a variety of echinoderms such as Asterias rubens, colonial ascidians such as Botryllus schlosseri and small hydroids.
Situation: This biotope is found in a similar situation to unit A3.2111, usually beneath the Fucus serratus zone (units A1.2141 or A1.2142) and above the Laminaria hyperborea zone (unit A3.214). Many of the animals found under boulders in the lower shore in A1.2142 are also found under boulders in the sublittoral fringe (A3.2112), particularly the sponges and crabs. Similarly, many of the seaweeds present on the lower shore are also present in the shallow sublittoral fringe.

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 Fucus serratus
Algae Laminaria digitata
Algae Laminaria hyperborea
Algae Laminaria saccharina
Algae Mastocarpus stellatus
Algae Membranoptera alata
Algae Palmaria palmata
Algae Ulva lactuca
Invertebrates Asterias rubens
Invertebrates Balanus crenatus
Invertebrates Botryllus schlosseri
Invertebrates Cancer pagurus
Invertebrates Electra pilosa
Invertebrates Gibbula cineraria
Invertebrates Halichondria panicea
Invertebrates Halisarca dujardini
Invertebrates Membranipora membranacea
Invertebrates Pisidia longicornis
Invertebrates Pomatoceros triqueter
Invertebrates Porcellana platycheles
Invertebrates Umbonula littoralis
Species scientific name English common name Species group
Chondrus crispus Algae
Cladophora rupestris Algae
Corallina officinalis Algae
Fucus serratus Algae
Laminaria digitata Algae
Laminaria hyperborea Algae
Laminaria saccharina Algae
Mastocarpus stellatus Algae
Membranoptera alata Algae
Palmaria palmata Algae
Ulva lactuca Algae
Asterias rubens Invertebrates
Balanus crenatus Invertebrates
Botryllus schlosseri Invertebrates
Cancer pagurus Invertebrates
Electra pilosa Invertebrates
Gibbula cineraria Invertebrates
Halichondria panicea Invertebrates
Halisarca dujardini Invertebrates
Membranipora membranacea Invertebrates
Pisidia longicornis Invertebrates
Pomatoceros triqueter Invertebrates
Porcellana platycheles Invertebrates
Umbonula littoralis Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 IR.MIR.KR.Ldig.Bo <I>Laminaria digitata</I> and under-boulder fauna on sublittoral fringe boulders 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 A3.2112 Laminaria digitata and under-boulder fauna on sublittoral fringe boulders same
EUNIS Habitat Classification 200308 A3.21111 Laminaria digitata and under-boulder fauna on sublittoral fringe boulders same
EUNIS Habitat Classification 200202 A3.21111 Laminaria digitata and under-boulder fauna on sublittoral fringe boulders same
EUNIS Habitat Classification 199910 A3.21111 Laminaria digitata and under-boulder fauna on sublittoral fringe boulders same
MNCR BioMar 97.06 (Britain & Ireland) MIR.KR.Ldig.Ldig.Bo Laminaria digitata and under-boulder fauna on sublittoral fringe boulders same
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