EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A1 - Littoral rock and other hard substrata > A1.4 - Features of littoral rock > A1.45 - Ephemeral green or red seaweeds (freshwater or sand-influenced) on non-mobile substrata

Ephemeral green or red seaweeds (freshwater or sand-influenced) on non-mobile substrata

English name: Ephemeral green or red seaweeds (freshwater or sand-influenced) on non-mobile substrata

Description (English)

Ephemeral seaweeds on disturbed littoral rock in the lower to upper shore. Dominant green seaweeds include Enteromorpha intestinalis, Ulva lactuca and the red seaweeds Rhodothamniella floridula and Porphyra purpurea. Winkles such as Littorina littorea and Littorina saxatilis, the limpet Patella vulgata and the barnacles Semibalanus balanoides can occur, though usually in low abundance. The crab Carcinus maenas can be found where boulders are present, while the barnacle Elminius modestus is usually present on sites subject to variable salinity. On moderately exposed shores, the biotope is Enteromorpha spp. on freshwater-influenced or unstable upper shore rock (A1.451) or P. purpurea and/or Enteromorpha spp. on sand-scoured mid to lower eulittoral rock (A1.452). These are biotopes with a low species diversity and the relatively high number of species in the characterising species list are due to a variation in the species composition from site to site, not to high species richness on individual sites.
Situation: This habitat type occurs the splash zone, sometimes on cliff faces, and throughout the main intertidal zone.
Note: Connor et al (2004) classify this habitat type together with A2.43 and A2.82 as LR.ELR.Eph.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A1.45

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Enteromorpha intestinalis
Algae Porphyra purpurea
Algae Rhodothamniella floridula
Algae Ulva lactuca
Invertebrates Carcinus maenas
Invertebrates Elminius modestus
Invertebrates Littorina littorea
Invertebrates Littorina saxatilis
Invertebrates Patella vulgata
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Enteromorpha intestinalis Algae
Porphyra purpurea Algae
Rhodothamniella floridula Algae
Ulva lactuca Algae
Carcinus maenas Invertebrates
Elminius modestus Invertebrates
Littorina littorea Invertebrates
Littorina saxatilis Invertebrates
Patella vulgata Invertebrates
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
CORINE Land Cover 4.2.3. Intertidal flats n/a
Marine Habitat Classification Britain/Ireland 0405 LR.FLR.Eph Ephemeral green or red seaweed communities (freshwater or sand-influenced) narrower
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A1.45 Ephemeral green or red seaweeds (freshwater or sand-influenced) on non-mobile substrata same
EUNIS Habitat Classification 200308 A1.24 Ephemeral green or red seaweeds (freshwater- or sand-influenced) on moderately exposed littoral rock wider
EUNIS Habitat Classification 200202 A1.24 Ephemeral green or red seaweeds (freshwater- or sand-influenced) on moderately exposed littoral rock overlap
EUNIS Habitat Classification 199910 A1.23 Ephemeral green or red seaweeds (freshwater- or sand-influenced) on moderately exposed littoral rock overlap
EUNIS Habitat Classification 199811 A1.23 Green or red ephemeral seaweeds (sand- or freshwater-influenced) overlap
EUNIS Habitat Classification 199712 A1.33 Green or red ephemeral seaweeds (sand- or freshwater-influenced) overlap
MNCR BioMar 97.06 (Britain & Ireland) MLR.Eph Ephemeral green or red seaweeds (freshwater- or sand-influenced) overlap
MNCR BioMar 96.7 (Britain & Ireland) MLR.GR   overlap
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