Silted cape-form Laminaria hyperborea on very sheltered infralittoral rock

English name: Silted cape-form Laminaria hyperborea on very sheltered infralittoral rock

Description (English)

Cape-form of the kelp Laminaria hyperborea on very silted rock, particularly in extremely sheltered sealochs of western Scotland. Below the huge kelp fronds (which often trail onto the seabed) foliose seaweeds form a silted understorey on the rock including Phycodrys rubens, Delesseria sanguinea, Cryptopleura ramosa and Plocamium cartilagineum as well as coralline crusts. At some sites the filamentous red seaweed Bonnemaisonia hamifera, Heterosiphonia plumosa and Brongniartella byssoides may carpet the seabed. Ascidians, particularly Ascidiella aspersa, Ascidia mentula, Ciona intestinalis and Clavelina lepadiformis thrive well in these conditions. The echinoderms Antedon bifida, Echinus esculentus and Asterias rubens are often present along with the gastropod Gibbula cineraria. An abundant growth of the hydroid Obelia geniculata can cover the silted kelp fronds along with the bryozoan Membranipora membranacea. The anthozoan Caryophyllia smithii can be present among the kelp holdfasts. The tube-building polychaete Pomatoceros triqueter can be present on the rock surface along with the crab Necora puber. This biotope generally occurs on shallow bedrock or boulder slopes or isolated rocks protruding through muddy sediment.
Situation: This biotope is often present on rocky outcrops surrounded by muddy sediments (such as unit A5.3541). Deeper, nearby rock, beyond the limit of foliose seaweeds, is often dominated by solitary ascidians (unit A4 311).

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A3.314
Bern Convention Included in a Resolution 4 habitat type at a higher level (A3)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Antedon bifida
Invertebrates Ascidia mentula
Invertebrates Ascidiella aspersa
Invertebrates Asterias rubens
Algae Brongniartella byssoides
Invertebrates Caryophyllia smithii
Invertebrates Ciona intestinalis
Invertebrates Clavelina lepadiformis
Algae Cryptopleura ramosa
Algae Delesseria sanguinea
Invertebrates Echinus esculentus
Invertebrates Gibbula cineraria
Algae Heterosiphonia plumosa
Algae Laminaria hyperborea
Invertebrates Membranipora membranacea
Invertebrates Necora puber
Invertebrates Obelia geniculata
Algae Phycodrys rubens
Algae Plocamium cartilagineum
Invertebrates Pomatoceros triqueter
Species scientific name English common name Species group
Antedon bifida Invertebrates
Ascidia mentula Invertebrates
Ascidiella aspersa Invertebrates
Asterias rubens Invertebrates
Brongniartella byssoides Algae
Caryophyllia smithii Invertebrates
Ciona intestinalis Invertebrates
Clavelina lepadiformis Invertebrates
Cryptopleura ramosa Algae
Delesseria sanguinea Algae
Echinus esculentus Invertebrates
Gibbula cineraria Invertebrates
Heterosiphonia plumosa Algae
Laminaria hyperborea Algae
Membranipora membranacea Invertebrates
Necora puber Invertebrates
Obelia geniculata Invertebrates
Phycodrys rubens Algae
Plocamium cartilagineum Algae
Pomatoceros triqueter Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 IR.LIR.K.LhypCape Silted cape-form <I>Laminaria hyperborea</I> on very sheltered infralittoral 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 A3.314 Silted cape-form Laminaria hyperborea on very sheltered infralittoral rock same
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