EUNIS habitat classification 2017 > M - Marine benthic habitats > MA1 - Littoral rock > MA12 - Atlantic littoral rock > MA127 - Communities of Atlantic littoral caves and overhangs > MA1276 - Sponges and shade-tolerant red seaweeds on overhanging lower eulittoral bedrock and in cave entrances > MA12761 - Sponges, shade-tolerant red seaweeds and Dendrodoa grossularia on wave-surged overhanging lower eulittoral bedrock and caves

Sponges, shade-tolerant red seaweeds and Dendrodoa grossularia on wave-surged overhanging lower eulittoral bedrock and caves

Description (English)

Overhanging bedrock on the lower shore, at cave entrances, to and on inner walls of caves, subject to wave surge and low light levels, and characterised by a high density of small groups of the solitary ascidian Dendrodoa grossularia. The sponges Grantia compressa, Halichondria panicea and Hymeniacidon perleve are common on the rock surface, while the hydroid Dynamena pumila (normally found on fucoids) hangs in distinct form from overhanging rock. Found on the rock surface are the calcareous tube-forming polychaetes Spirorbis spp. and Pomatoceros spp. along with the barnacles Semibalanus balanoides. The anemone Actinia equina thrives in the permanently damp pits and crevices. Where sufficient light is available a sparse community of shade-tolerant red seaweeds. These include Membranoptera alata, Lomentaria articulata, Audouinella spp. and coralline crusts.
Situation: This biotope is found on lower shore overhangs and on the entrances and inner walls of lower shore caves, and usually dominates the available habitat. It is generally found above the MA1-27A biotope and may extend to the upper walls of caves.
Temporal variation: Some variation in the species composition of the individual caves must be expected depending on local conditions.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MA12761
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Lomentaria articulata
Algae Membranoptera alata
Invertebrates Actinia equina
Invertebrates Dendrodoa grossularia
Invertebrates Dynamena pumila
Invertebrates Grantia compressa
Invertebrates Halichondria panicea
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Lomentaria articulata Algae
Membranoptera alata Algae
Actinia equina Invertebrates
Dendrodoa grossularia Invertebrates
Dynamena pumila Invertebrates
Grantia compressa Invertebrates
Halichondria panicea Invertebrates
Semibalanus balanoides Invertebrates

Other classifications

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A1.4461 Sponges, shade-tolerant red seaweeds and Dendrodoa grossularia on wave-surged overhanging lower eulittoral bedrock and caves same
European Environment Agency (EEA)
Kongens Nytorv 6
1050 Copenhagen K
Denmark
Phone: +45 3336 7100