EUNIS habitat classification 2017 > M - Marine benthic habitats > MB1 - Infralittoral rock > MB12 - Atlantic infralittoral rock > MB123 - Kelp and seaweed communities on sediment-affected or disturbed Atlantic infralittoral rock > MB1237 - Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered Atlantic infralittoral rock

Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered Atlantic infralittoral rock

Description (English)

Low-lying rock surrounded by mobile sand and often subject to burying by the sand, with a turf of resilient red seaweeds Chondrus crispus, Polyides rotundus and Ahnfeltia plicata typically protruding through the sand on the upper surfaces of the rock. Other scour-tolerant seaweeds include Rhodomela confervoides, Phyllophora pseudoceranoides, Phyllophora crispa, Furcellaria lumbricalis, Gracilaria gracilis, Ceramium rubrum, Plocamium cartilagineum, Heterosiphonia plumosa, Cryptopleura ramosa and Dilsea carnosa. Coralline crusts typically cover the rock, while scattered individuals of the brown seaweeds Halidrys siliquosa, Cladostephus spongiosus, Dictyota dichotoma and Laminaria saccharina can be present. The large anthozoan Urticina felina can occur in this biotope but there are few other conspicuous animals.
Situation: This biotope occurs on shallow sand-covered rock, often below bedrock and boulders supporting kelp forest, which is above the effect of, sand scour (unit MB1-21A) or abutting sand-scoured kelp on bedrock (unit MB1-235). It may also be found adjacent to the shallow kelp and Chorda filum biotope (unit MB1-233) and similarly can be surrounded by a variety of sediment biotopes.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MB1237
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Ahnfeltia plicata
Algae Ceramium rubrum
Algae Chondrus crispus
Algae Cladostephus spongiosus
Algae Cryptopleura ramosa
Algae Dictyota dichotoma
Algae Dilsea carnosa
Algae Furcellaria lumbricalis
Algae Gracilaria gracilis
Algae Heterosiphonia plumosa
Algae Laminaria saccharina
Algae Phyllophora crispa
Algae Plocamium cartilagineum
Algae Polyides rotundus
Algae Rhodomela confervoides
Invertebrates Urticina felina
Species scientific name English common name Species group
Ahnfeltia plicata Algae
Ceramium rubrum Algae
Chondrus crispus Algae
Cladostephus spongiosus Algae
Cryptopleura ramosa Algae
Dictyota dichotoma Algae
Dilsea carnosa Algae
Furcellaria lumbricalis Algae
Gracilaria gracilis Algae
Heterosiphonia plumosa Algae
Laminaria saccharina Algae
Phyllophora crispa Algae
Plocamium cartilagineum Algae
Polyides rotundus Algae
Rhodomela confervoides Algae
Urticina felina Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A3.127 Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered 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 A3.127 Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock same
EUNIS Habitat Classification 200308 A3.237 Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock same
EUNIS Habitat Classification 200202 A3.237 Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock same
EUNIS Habitat Classification 199910 A3.237 Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) MIR.SedK.PolAhn Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock same
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