EUNIS habitat classification 2017 > M - Marine benthic habitats > MA1 - Littoral rock > MA12 - Atlantic littoral rock > MA124 - Mussel and/or barnacle communities with seaweeds on Atlantic littoral rock > MA1245 - Rhodothamniella floridula on sand-scoured lower eulittoral rock

Rhodothamniella floridula on sand-scoured lower eulittoral rock

Quick facts

EUNIS habitat type code MA1245
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Description (English)

Lower eulittoral and sublittoral fringe bedrock and boulders subject to mild sand-scouring characterised by a canopy of the wracks Fucus serratus or Fucus vesiculosus, beneath which a mat of the sand-binding red seaweed Rhodothamniella floridula occurs. These mats can form distinct areas without F. serratus. The small hummocks of R. floridula also contain a diversity of other red seaweeds tolerant of sand scour, e.g. Palmaria palmata, Chondrus crispus, coralline crusts and Mastocarpus stellatus. The brown seaweed Cladostephus spongiosus or the ephemeral green seaweed Enteromorpha intestinalis, Ulva lactuca or Cladophora rupestris may occur. The hydroid Dynamena pumila can form colonies on the F. serratus fronds. The barnacle Semibalanus balanoides, the limpet Patella vulgata, the anemone Actinia equina and the polychaete Pomatoceros triqueter may be present where bedrock are available along with a few winkles such as Littorina littorea. In addition, polychaetes and amphipods may burrow into the R. floridula mat, while the mussel Mytilus edulis is restricted to small crevices in the bedrock. The species diversity of this biotope is normally low and there can be much variation in the species composition from site to site.
Situation: Above this biotope in sand influenced areas are a community dominated by M. edulis and F. vesiculosus or where the sand scour is more severe, is a biotope dominated by ephemeral seaweeds such as Enteromorpha spp. and the red seaweed Porphyra spp. (unit MA1-23H). Below this biotope are biotopes dominated by F. serratus and/or red seaweeds (see subunits of MA1-244) or biotopes dominated by kelp such as Alaria esculenta and/or Laminaria digitata (MB1-2112).
Temporal variation: Where sand scour is more severe, fucoids and R. floridula may be rare or absent and green ephemeral seaweeds dominate the substratum (unit MA1-23H).

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Alaria esculenta
Algae Chondrus crispus
Algae Cladophora rupestris
Algae Cladostephus spongiosus
Algae Enteromorpha intestinalis
Algae Fucus serratus
Algae Fucus vesiculosus
Algae Laminaria digitata
Algae Palmaria palmata
Algae Rhodothamniella floridula
Algae Ulva lactuca
Invertebrates Actinia equina
Invertebrates Dynamena pumila
Invertebrates Mytilus edulis
Invertebrates Patella vulgata
Invertebrates Pomatoceros triqueter
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Alaria esculenta Algae
Chondrus crispus Algae
Cladophora rupestris Algae
Cladostephus spongiosus Algae
Enteromorpha intestinalis Algae
Fucus serratus Algae
Fucus vesiculosus Algae
Laminaria digitata Algae
Palmaria palmata Algae
Rhodothamniella floridula Algae
Ulva lactuca Algae
Actinia equina Invertebrates
Dynamena pumila Invertebrates
Mytilus edulis Invertebrates
Patella vulgata Invertebrates
Pomatoceros triqueter Invertebrates
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A1.215 Rhodothamniella floridula on sand-scoured lower eulittoral rock same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A1.215 Rhodothamniella floridula on sand-scoured lower eulittoral rock same
EUNIS Habitat Classification 200308 A1.243 Rhodothamniella floridula on sand-scoured lower eulittoral rock same
EUNIS Habitat Classification 200202 A1.243 Rhodothamniella floridula on sand-scoured lower eulittoral rock same
EUNIS Habitat Classification 199910 A1.233 Rhodothamniella floridula on sand-scoured lower eulittoral rock same
MNCR BioMar 97.06 (Britain & Ireland) MLR.Eph.Rho Rhodothamniella floridula on sand-scoured lower eulittoral rock same
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100