Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock

English name: Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock

Quick facts

EUNIS habitat type code A3.341
Bern Convention Included in a Resolution 4 habitat type at a higher level (A3)

Description (English)

Permanently submerged mixed fucoids on rock in lagoons. The main species are the wracks Fucus serratus and Fucus vesiculosus, but the brown seaweeds Chorda filum, Ascophyllum nodosum and Ectocarpaceae can be present as well. Red seaweeds are normally present and include Mastocarpus stellatus, Polyides rotundus, Chondrus crispus, Ceramium spp. and coralline crusts. A variety of green seaweeds is also present and include Enteromorpha spp., while dense patches of Cladophora rupestris may occur on vertical rock faces. The faunal component is restricted to the mussel Mytilus edulis, the polychaete Arenicola marina and the crab Carcinus maenas. Opossum shrimps Mysidae can be present as well. The kelp Laminaria saccharina is absent, possibly due to the low salinity conditions.
Situation: Nearby rock often supports similar biotopes of submerged fucoids (units A3.342 and A3.344) or where salinity is further reduced unit A3.343 can occur. Slightly deeper rock often supports Laminaria saccharina (unit A3.3132), usually surrounded by more extensive areas of sediment. Seagrass beds thrive well in the muddy sediments of the lagoons and often cover large areas. They include both Ruppia spp. and Zostera marina and some locations in the Outer Hebrides support dense beds of the nationally rare stonewort Lamprothamnion papulosum (units A5.5343 and A5.5331). The sublittoral mud, which abuts most of the submerged rock, can become anoxic and covered by a bacterial mat of Beggiatoa spp. (unit A5.7211).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Ascophyllum nodosum
Algae Chondrus crispus
Algae Chorda filum
Algae Cladophora rupestris
Algae Fucus serratus
Algae Fucus vesiculosus
Algae Laminaria saccharina
Algae Mastocarpus stellatus
Algae Polyides rotundus
Flowering Plants Zostera marina
Invertebrates Arenicola marina
Invertebrates Carcinus maenas
Invertebrates Mytilus edulis
Species scientific name English common name Species group
Ascophyllum nodosum Algae
Chondrus crispus Algae
Chorda filum Algae
Cladophora rupestris Algae
Fucus serratus Algae
Fucus vesiculosus Algae
Laminaria saccharina Algae
Mastocarpus stellatus Algae
Polyides rotundus Algae
Zostera marina Flowering Plants
Arenicola marina Invertebrates
Carcinus maenas Invertebrates
Mytilus edulis Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 IR.LIR.Lag.FChoG Mixed fucoids, <I>Chorda filum</I> and green seaweeds on reduced 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 A3.341 Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock same
EUNIS Habitat Classification 200308 A3.331 Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock same
EUNIS Habitat Classification 200202 A3.331 Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock same
EUNIS Habitat Classification 199910 A3.331 Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) SIR.Lag.FChoG Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock same
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