EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A3 - Infralittoral rock and other hard substrata > A3.1 - Atlantic and Mediterranean high energy infralittoral rock > A3.12 - Sediment-affected or disturbed kelp and seaweed communities > A3.123 - Laminaria saccharina, Chorda filum and dense red seaweeds on shallow unstable infralittoral boulders and cobbles

Laminaria saccharina, Chorda filum and dense red seaweeds on shallow unstable infralittoral boulders and cobbles

English name: Laminaria saccharina, Chorda filum and dense red seaweeds on shallow unstable infralittoral boulders and cobbles

Quick facts

EUNIS habitat type code A3.123
Bern Convention Included in a Resolution 4 habitat type at a higher level (A3)

Description (English)

Seasonally disturbed unstable boulders and cobbles in very shallow water dominated by the fast-growing brown seaweed Chorda filum together with the kelp Laminaria saccharina. The brown seaweed Desmarestia aculeata is also typical of this disturbed environment as well encrusting coralline algae and brown crusts. Beneath the prolific growth of C. filum, red and brown seaweeds densely cover many of the boulders, cobbles and pebbles. Other sediment-tolerant seaweeds such as species from the Ectocarpales (brown filamentous seaweeds) and the red seaweeds Chondrus crispus, Phyllophora pseudoceranoides, Dilsea carnosa and Corallina officinalis is normally present. Other red seaweeds which can be found here include Chondria dasyphylla, Brongniartella byssoides, Polysiphonia elongata, Ceramium nodolosum, Cystoclonium purpureum, Heterosiphonia plumosa, Rhodomela confervoides and Plocamium cartilagineum. The brown seaweeds Punctaria sp. and Cladostephus spongiosus are generally present. The faunal component of this biotope is typically sparse - the starfish Asterias rubens and the crabs Pagurus bernhardus and Necora puber are amongst the most conspicuous animals. The bryozoan crust Electra pilosa colonise many of the algae along with the ascidian Botryllus schlosseri. Occasional the polychaete Lanice conchilega may occur in the sand between pebbles, and the anthozoan Urticina felina may be found amongst pockets of gravel along with the gastropod Gibbula cineraria. At some sites the rock beneath the algae can be occupied by the tube-building polychaete Pomatoceros triqueter. This biotope is also present at other open coast sites around the UK where suitable shallow, seasonally stable boulders, cobbles and pebbles occur. Typical examples of this biotope occur on the shallowest areas of the Sarns in Cardigan Bay, Wales, where reef crests are formed by embedded and mobile boulders, together with cobbles and pebbles in between (typically at 2-3m depth).
Situation: This biotope occurs in shallow water, often on the crest of an infralittoral boulder/cobble bank and as such will not have any biotope 'above' it. More mobile areas of smaller boulders, cobbles and pebbles nearby may support dense ephemeral red seaweeds (unit A2.82) or robust scour-tolerant red seaweeds on sand-covered rock (unit A3.127). The Halidrys siliquosa biotope (unit A3.126) also thrives under similar conditions, extending deeper than the shallow A3.123 biotope. Deeper still in the circalittoral zone encrusting fauna is found on highly mobile mixed substrata (A5.141). At a few sites, this biotope can occur within more extensive maerl beds (A5.51) but more commonly is surrounded by sandy sediments (A5.2).
Temporal variation: This biotope will change markedly with the seasons. During the winter months boulders and cobbles will be storm battered and overturned and much of the biota dislodged from the rocks. During more stable conditions in the late spring and summer months the fast-growing seaweeds that characterise this biotope (C. filum and L. saccharina in particular) will be quick to re-establish, growing at a phenomenal rate. The seasonal disturbance of the substratum prevents a stable Laminaria hyperborea forest from developing.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Asterias rubens
Invertebrates Botryllus schlosseri
Algae Brongniartella byssoides
Algae Chondria dasyphylla
Algae Chondrus crispus
Algae Chorda filum
Algae Cladostephus spongiosus
Algae Corallina officinalis
Algae Cystoclonium purpureum
Algae Desmarestia aculeata
Algae Dilsea carnosa
Invertebrates Electra pilosa
Invertebrates Gibbula cineraria
Algae Halidrys siliquosa
Algae Heterosiphonia plumosa
Algae Laminaria hyperborea
Algae Laminaria saccharina
Invertebrates Lanice conchilega
Invertebrates Necora puber
Algae Plocamium cartilagineum
Algae Polysiphonia elongata
Invertebrates Pomatoceros triqueter
Algae Rhodomela confervoides
Invertebrates Urticina felina
Species scientific name English common name Species group
Asterias rubens Invertebrates
Botryllus schlosseri Invertebrates
Brongniartella byssoides Algae
Chondria dasyphylla Algae
Chondrus crispus Algae
Chorda filum Algae
Cladostephus spongiosus Algae
Corallina officinalis Algae
Cystoclonium purpureum Algae
Desmarestia aculeata Algae
Dilsea carnosa Algae
Electra pilosa Invertebrates
Gibbula cineraria Invertebrates
Halidrys siliquosa Algae
Heterosiphonia plumosa Algae
Laminaria hyperborea Algae
Laminaria saccharina Algae
Lanice conchilega Invertebrates
Necora puber Invertebrates
Plocamium cartilagineum Algae
Polysiphonia elongata Algae
Pomatoceros triqueter Invertebrates
Rhodomela confervoides Algae
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 IR.HIR.KSed.LsacChoR <I>Laminaria saccharina</I>, <I>Chorda filum</I> and dense red seaweeds on shallow unstable infralittoral boulders or cobbles 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 A3.123 Laminaria saccharina, Chorda filum and dense red seaweeds on shallow unstable infralittoral boulders and cobbles same
EUNIS Habitat Classification 200308 A3.232 Laminaria saccharina, Chorda filum and dense red seaweeds on shallow unstable infralittoral boulders and cobbles same
EUNIS Habitat Classification 200202 A3.232 Laminaria saccharina, Chorda filum and dense red seaweeds on shallow unstable infralittoral boulders and cobbles same
EUNIS Habitat Classification 199910 A3.232 Laminaria saccharina, Chorda filum and dense red seaweeds on shallow unstable infralittoral boulders and cobbles same
MNCR BioMar 97.06 (Britain & Ireland) MIR.SedK.LsacChoR Laminaria saccharina, Chorda filum and dense red seaweeds on shallow unstable infralittoral boulders and cobbles same
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