Laminaria saccharina park on very sheltered Atlantic lower infralittoral rock

Quick facts

EUNIS habitat type code MB123A3
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Description (English)

Silty bedrock or boulders with a Laminaria saccharina park (often the cape-form). Beneath the canopy, the rock is covered by encrusting coralline algae, and the urchin Echinus esculentus is often present. Due to the amount of silt cover on the rock and the reduced light intensity beneath the broad-fronded kelp, only a few red seaweeds typically survive, the most common species being Phycodrys rubens, Delesseria sanguinea, Bonnemaisonia spp. and Brongniartella byssoides. The brown seaweeds Dictyota dichotoma and Cutleria multifida may be present in low abundance. Compared to the kelp forest zone above (MB1-2391) both the kelp and other seaweeds are sparse (Occasional). The most conspicuous animals are large solitary ascidians, particularly Ascidia mentula and Ciona intestinalis, together with the smaller Clavelina lepadiformis. In general, the faunal component of this biotope is similar to other sheltered kelp biotopes and includes a variety of mobile crustaceans such Carcinus maenas and Pagurus bernhardus, the keelworm Pomatoceros spp., terebellid worms, echinoderms Asterias rubens, Ophiothrix fragilis and the featherstar Antedon bifida. The hydroid Kirchenpauria pinnata, although only rare is often found in the kelp park along with the top shell Gibbula cineraria and the barnacle Balanus crenatus.
Situation: L. saccharina park can be found below a similar forest (unit MB1-2391) where suitable hard substrata exist or on isolated rock exposures surrounded by sediment communities. It may also occur below a zone of mixed Laminaria hyperborea and L. saccharina forest (MB1-239). L. saccharina can also form a band below L. hyperborea forest (MB1-21A1) where some shelter from wave-action is afforded with depth (L. saccharina is not tolerant of surge), or more likely where L. hyperborea has been grazed out (below MB1-21A3) since L. saccharina grows far quicker than L. hyperborea. Where such a narrow band occurs it is generally less silted than that found below MB1-2391 in much more sheltered conditions. A range of sheltered circalittoral biotopes may occur on any deeper rock below (e.g. units MC1-233, A4 311 and MC2-223).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Brongniartella byssoides
Algae Cutleria multifida
Algae Delesseria sanguinea
Algae Dictyota dichotoma
Algae Laminaria hyperborea
Algae Laminaria saccharina
Algae Phycodrys rubens
Invertebrates Antedon bifida
Invertebrates Asterias rubens
Invertebrates Balanus crenatus
Invertebrates Carcinus maenas
Invertebrates Ciona intestinalis
Invertebrates Clavelina lepadiformis
Invertebrates Echinus esculentus
Invertebrates Gibbula cineraria
Invertebrates Pagurus bernhardus
Species scientific name English common name Species group
Brongniartella byssoides Algae
Cutleria multifida Algae
Delesseria sanguinea Algae
Dictyota dichotoma Algae
Laminaria hyperborea Algae
Laminaria saccharina Algae
Phycodrys rubens Algae
Antedon bifida Invertebrates
Asterias rubens Invertebrates
Balanus crenatus Invertebrates
Carcinus maenas Invertebrates
Ciona intestinalis Invertebrates
Clavelina lepadiformis Invertebrates
Echinus esculentus Invertebrates
Gibbula cineraria Invertebrates
Pagurus bernhardus Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A3.3133 Laminaria saccharina park on very sheltered lower infralittoral rock same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A3.3133 Laminaria saccharina park on very sheltered lower infralittoral rock same
EUNIS Habitat Classification 200308 A3.3123 Laminaria saccharina park on very sheltered lower infralittoral rock same
EUNIS Habitat Classification 200202 A3.3123 Laminaria saccharina park on very sheltered lower infralittoral rock same
EUNIS Habitat Classification 199910 A3.3123 Laminaria saccharina park on very sheltered lower infralittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) SIR.K.Lsac.Pk Laminaria saccharina park on very sheltered lower infralittoral rock same
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