EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A1 - Littoral rock and other hard substrata > A1.3 - Low energy littoral rock > A1.32 - Fucoids in variable salinity > A1.322 - Fucus spiralis on sheltered variable salinity upper eulittoral rock

Fucus spiralis on sheltered variable salinity upper eulittoral rock

English name: Fucus spiralis on sheltered variable salinity upper eulittoral rock

Description (English)

Sheltered to extremely sheltered upper eulittoral bedrock or mixed substrata (boulders, large cobbles or shells on mud) in variable salinity conditions characterised by a band of the spiral wrack Fucus spiralis. The ephemeral green seaweed Enteromorpha intestinalis is usually found in this species poor biotope. The barnacles Semibalanus balanoides and Elminius modestus can be found where suitable substrata are available, while gammarids can be found underneath the fronds of F. spiralis and/or underneath the boulders and cobbles. Also found underneath the fronds and among the boulders are the winkles Littorina saxatilis and Littorina littorea and the crab Carcinus maenas.
Situation: This zone usually lies below a zone dominated by the wrack Pelvetia canaliculata (unit A1.311) and occasional clumps of P. canaliculata may be present (usually less than common) amongst the F. spiralis. In areas of extreme shelter and variable salinity conditions (e.g. in Scottish sea lochs), the P. canaliculata and F. spiralis zones often merge together forming a very narrow band. This unit occurs above the wracks Ascophyllum nodosum (A1.324) and/or Fucus vesiculosus (A1.323) zones and these two fucoids may also occur, although F. spiralis always dominates. It can also be found above a zone dominated by the wrack Fucus ceranoides (A1.327).
Temporal variation: During the summer months ephemeral green seaweeds such as E. intestinalis can be common.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A1.322

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Ascophyllum nodosum
Algae Enteromorpha intestinalis
Algae Fucus ceranoides
Algae Fucus spiralis
Algae Fucus vesiculosus
Algae Pelvetia canaliculata
Invertebrates Carcinus maenas
Invertebrates Elminius modestus
Invertebrates Littorina littorea
Invertebrates Littorina saxatilis
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Ascophyllum nodosum Algae
Enteromorpha intestinalis Algae
Fucus ceranoides Algae
Fucus spiralis Algae
Fucus vesiculosus Algae
Pelvetia canaliculata Algae
Carcinus maenas Invertebrates
Elminius modestus Invertebrates
Littorina littorea Invertebrates
Littorina saxatilis Invertebrates
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.LLR.FVS.FspiVS <I>Fucus spiralis</I> on sheltered variable salinity upper eulittoral rock source
CORINE Land Cover 4.2.3. Intertidal flats n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A1.322 Fucus spiralis on sheltered variable salinity upper eulittoral rock same
EUNIS Habitat Classification 200308 A1.312 Fucus spiralis on moderately exposed to very sheltered upper eulittoral rock wider
EUNIS Habitat Classification 200202 A1.312 Fucus spiralis on moderately exposed to very sheltered upper eulittoral rock same
EUNIS Habitat Classification 199910 A1.312 Fucus spiralis on moderately exposed to very sheltered upper eulittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) SLR.F.Fspi Fucus spiralis on moderately exposed to very sheltered upper eulittoral rock same
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