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 > MB1234 - Dense Desmarestia spp. with filamentous red seaweeds on exposed Atlantic infralittoral cobbles, pebbles and bedrock

Dense Desmarestia spp. with filamentous red seaweeds on exposed Atlantic infralittoral cobbles, pebbles and bedrock

Description (English)

Wave-exposed seasonally mobile substrata (pebbles, cobbles) dominated by dense stands of the brown seaweed Desmarestia aculeata and/or Desmarestia ligulata. Infralittoral pebbles and cobbles that are scoured through mobility during storms, but become stable in the summer allowing the growth of such algae as Desmarestia spp. Filamentous red seaweeds such as Bonnemaisonia asparagoides and Brongniartella byssoides are usually present. Stunted individuals of the kelp such as Laminaria hyperborea and Laminaria saccharina may be present where bedrock is available. A variety of foliose red seaweeds such as Cryptopleura ramosa, Chondrus crispus, Plocamium cartilagineum, Hypoglossum hypoglossoides and Nitophyllum punctatum may on occasion be present underneath the kelp canopy. Other red algae including Corallina officinalis, Rhodomela confervoides and coralline crusts including Lithothamnion spp. may be present as well as well as the foliose brown seaweed Dictyota dichotoma and the green Enteromorpha intestinalis. Due to the nature of this biotope the faunal component is very impoverished though the gastropod Gibbula cineraria can be found among the cobbles.
Situation: Often a narrow zone on mixed substrata below a stable zone of kelp on bedrock. Where seasonally mobile substrata affect nearby bedrock this biotope may occur in place of kelp forest.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MB1234
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 Bonnemaisonia asparagoides
Algae Brongniartella byssoides
Algae Chondrus crispus
Algae Corallina officinalis
Algae Cryptopleura ramosa
Algae Desmarestia aculeata
Algae Desmarestia ligulata
Algae Dictyota dichotoma
Algae Enteromorpha intestinalis
Algae Laminaria hyperborea
Algae Laminaria saccharina
Algae Nitophyllum punctatum
Algae Plocamium cartilagineum
Algae Rhodomela confervoides
Invertebrates Gibbula cineraria
Species scientific name English common name Species group
Bonnemaisonia asparagoides Algae
Brongniartella byssoides Algae
Chondrus crispus Algae
Corallina officinalis Algae
Cryptopleura ramosa Algae
Desmarestia aculeata Algae
Desmarestia ligulata Algae
Dictyota dichotoma Algae
Enteromorpha intestinalis Algae
Laminaria hyperborea Algae
Laminaria saccharina Algae
Nitophyllum punctatum Algae
Plocamium cartilagineum Algae
Rhodomela confervoides Algae
Gibbula cineraria Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A3.124 Dense Desmarestia spp. with filamentous red seaweeds on exposed infralittoral cobbles, pebbles and bedrock same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A3.124 Dense Desmarestia spp. with filamentous red seaweeds on exposed infralittoral cobbles, pebbles and bedrock same
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