Laminaria saccharina on very sheltered infralittoral rock

English name: Laminaria saccharina on very sheltered infralittoral rock

Quick facts

EUNIS habitat type code A3.313
Bern Convention Included in a Resolution 4 habitat type at a higher level (A3)

Description (English)

Very sheltered infralittoral rock dominated by the kelp Laminaria saccharina. Typically very silty and often with few associated seaweeds due to siltation, grazing or shading from the dense kelp canopy. The most commonly occurring red seaweeds are Delesseria sanguinea, Phycodrys rubens, Bonnemaisonia hamifera and coralline crusts. In addition to the kelp the brown seaweed Chorda filum and Ectocarpaceae are often present. As well as lacking Laminaria hyperborea, the A3.313 biotopes have fewer foliose and filamentous red seaweed species by comparison to A3.312 biotopes. A depauperate assemblage of animals is present (by comparison to A3.2141 and A3.2142) predominantly consisting of the encrusting polychaetes Pomatoceros triqueter, the crabs Carcinus maenas and Pagurus bernhardus and the ubiquitous gastropod Gibbula cineraria. The echinoderms Antedon bifida, starfish Asterias rubens, brittlestar Ophiothrix fragilis and urchin Echinus esculentus occur in low abundance. Ascidians are commonly found in all the A3.313 biotopes, but the large solitary ascidian Ascidia mentula are most prolific in very sheltered conditions of L. saccharina forests (A3.3132). This biotope is most commonly associated with the sheltered fjordic sealochs of Scotland where sublittoral hard substrata can be found at the sheltered head of the lochs. Similarly the sheltered loughs of Ireland (Lough Hyne, Strangford Lough and Carlingford Lough). It is also found where suitable hard substrata exist in the sheltered inlets of south-west Britain, such as Milford Haven or Plymouth Sound. 4 variants has been described: A mixture of L. saccharina and Laminaria digitata (A3.3131), dense L. saccharina forest in the upper infralittoral (A3.3132), sparse L. saccharina in the lower infralittoral (A3.3133) and urchin-grazed (A3.3134).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Antedon bifida
Invertebrates Ascidia mentula
Invertebrates Asterias rubens
Algae Bonnemaisonia hamifera
Invertebrates Carcinus maenas
Algae Chorda filum
Algae Delesseria sanguinea
Invertebrates Echinus esculentus
Invertebrates Gibbula cineraria
Algae Laminaria digitata
Algae Laminaria hyperborea
Algae Laminaria saccharina
Invertebrates Ophiothrix fragilis
Invertebrates Pagurus bernhardus
Algae Phycodrys rubens
Invertebrates Pomatoceros triqueter
Species scientific name English common name Species group
Antedon bifida Invertebrates
Ascidia mentula Invertebrates
Asterias rubens Invertebrates
Bonnemaisonia hamifera Algae
Carcinus maenas Invertebrates
Chorda filum Algae
Delesseria sanguinea Algae
Echinus esculentus Invertebrates
Gibbula cineraria Invertebrates
Laminaria digitata Algae
Laminaria hyperborea Algae
Laminaria saccharina Algae
Ophiothrix fragilis Invertebrates
Pagurus bernhardus Invertebrates
Phycodrys rubens Algae
Pomatoceros triqueter Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 IR.LIR.K.Lsac <I>Laminaria saccharina</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 A3.313 Laminaria saccharina on very sheltered infralittoral rock same
EUNIS Habitat Classification 200308 A3.312 Laminaria saccharina on very sheltered infralittoral rock same
EUNIS Habitat Classification 200202 A3.312 Laminaria saccharina on very sheltered infralittoral rock same
EUNIS Habitat Classification 199910 A3.312 Laminaria saccharina on very sheltered infralittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) SIR.K.Lsac Laminaria saccharina on very sheltered infralittoral rock same
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