EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A3 - Infralittoral rock and other hard substrata > A3.2 - Atlantic and Mediterranean moderate energy infralittoral rock > A3.22 - Kelp and seaweed communities in tide-swept sheltered conditions > A3.225 - Filamentous red seaweeds, sponges and Balanus crenatus on tide-swept variable-salinity infralittoral rock

Filamentous red seaweeds, sponges and Balanus crenatus on tide-swept variable-salinity infralittoral rock

English name: Filamentous red seaweeds, sponges and Balanus crenatus on tide-swept variable-salinity infralittoral rock

Quick facts

EUNIS habitat type code A3.225
Bern Convention Included in a Resolution 4 habitat type at a higher level (A3)

Description (English)

Tide-swept infralittoral rock subject to variable salinity and turbid waters occurs in the mid to upper reaches of the rias of south-west Britain, where riverine freshwater input reduces the salinity. Very shallow rock under these conditions is characterised by a covering of filamentous red seaweed such as Callithamnion spp., Antithamnion spp., Ceramium spp., Griffithsia devoniensis, Pterothamnion plumula and Polysiphonia fucoides, as well as the filamentous green seaweed Cladophora spp. Foliose red seaweeds such as Hypoglossum hypoglossoides, Cryptopleura ramosa and Erythroglossum laciniatum commonly occur, as does the foliose green seaweed Ulva lactuca. Although Laminaria saccharina is often present it is usually in very low abundance (Occasional). The fluctuating salinity limits the number of species able to exist in this habitat. The animal community is dominated by the sponges Halichondria panicea and Hymeniacidon perleve and the barnacle Balanus crenatus. The ascidians Clavelina lepadiformis and Dendrodoa grossularia can be locally abundant at some sites. The crab Carcinus maenas is usually present, as is the mussel Mytilus edulis. The bryozoan Bugula plumosa is sometimes present. Where vertical rock is present, the seaweeds Ceramium nodulosum, P. plumula, C. ramosa, H. hypoglossoides and E. laciniatum are typically found.
Situation: This biotope is usually found amidst sediment or rock and as such there is no defined zonation of the surrounding biotopes. Shallow sediments nearby may support seagrass beds (Zostera spp.) or infaunal-dominated sediments (unit A5.13). Nearby, deeper tide-swept rock may support circalittoral communities dominated by sponges, hydroids and ascidians on stable rock (unit A4.2511) or dense bryozoans on mixed substrata (units A4.135 & A4.137).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Cryptopleura ramosa
Algae Erythroglossum laciniatum
Algae Griffithsia devoniensis
Algae Hypoglossum hypoglossoides
Algae Laminaria saccharina
Algae Polysiphonia fucoides
Algae Pterothamnion plumula
Algae Ulva lactuca
Invertebrates Balanus crenatus
Invertebrates Bugula plumosa
Invertebrates Carcinus maenas
Invertebrates Clavelina lepadiformis
Invertebrates Dendrodoa grossularia
Invertebrates Halichondria panicea
Invertebrates Mytilus edulis
Species scientific name English common name Species group
Cryptopleura ramosa Algae
Erythroglossum laciniatum Algae
Griffithsia devoniensis Algae
Hypoglossum hypoglossoides Algae
Laminaria saccharina Algae
Polysiphonia fucoides Algae
Pterothamnion plumula Algae
Ulva lactuca Algae
Balanus crenatus Invertebrates
Bugula plumosa Invertebrates
Carcinus maenas Invertebrates
Clavelina lepadiformis Invertebrates
Dendrodoa grossularia Invertebrates
Halichondria panicea Invertebrates
Mytilus edulis Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 IR.MIR.KT.FilRVS Filamentous red seaweeds, sponges and <I>Balanus crenatus</I> on tide-swept variable-salinity 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 A3.225 Filamentous red seaweeds, sponges and Balanus crenatus on tide-swept variable-salinity infralittoral rock same
EUNIS Habitat Classification 200308 A3.314 Laminaria saccharina on reduced or low salinity infralittoral rock narrower
EUNIS Habitat Classification 200308 A3.3141 Filamentous red seaweeds, sponges and Balanus crenatus on tide-swept variable-salinity infralittoral rock same
EUNIS Habitat Classification 200202 A3.3141 Sparse Laminaria saccharina with dense filamentous red seaweeds, sponges and Balanus crenatus on tide-swept variable salinity infralittoral rock same
EUNIS Habitat Classification 199910 A3.3141 Sparse Laminaria saccharina with dense filamentous red seaweeds, sponges and Balanus crenatus on tide-swept variable salinity infralittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) SIR.K.LsacRS.FiR Sparse Laminaria saccharina with dense filamentous red seaweeds, sponges and Balanus crenatus on tide-swept variable salinity infralittoral rock same
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