Verrucaria mauraand sparse barnacles on exposed littoral fringe rock

Quick facts

EUNIS habitat type code MA12131
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Description (English)

The littoral fringe of very exposed to moderately exposed rocky shores with a sparse covering of the barnacles Semibalanus balanoides and/or Chthamalus montagui over the black lichen Verrucaria maura. Winkles Littorina saxatilis and Melarhaphe neritoides are usually present although M. neritoides tends to be found on more exposed shores. The limpet Patella vulgata is often present though at a low abundance (Occasional). This biotope can be dominated by ephemeral seaweeds including the red seaweed Porphyra umbilicalis, the green seaweeds Enteromorpha spp. or, particulary in the north, microscopic blue-green algae (Cyanophyceae), which overgrow V. maura. The wrack Pelvetia canaliculata (Rare) may also be present, becoming increasingly more common with greater shelter (see MA1-241). Geographical variation: On northern and eastern shores the barnacle is usually S. balanoides, which is normally restricted to the lower littoral fringe, with a band of V. maura only in the upper littoral fringe. On south-west and western shores the barnacle is usually C. montagui which may extend over the whole of the littoral fringe zone.
Situation: MA1-2131 is usually found on more exposed coasts below the V. maura biotope MA1-2132. It is found above the mussel Mytilus edulis and barnacles biotope (MA1-241) or above the barnacle and Patella spp. zone (MA1-2221; MA1-223). MA1-2131 also occurs on vertical faces of moderately exposed shores where the P. canaliculata biotope (MA1-241) usually dominates on non-vertical faces.
Temporal variation: The abundance of P. umbilicalis shows considerable seasonal and geographical variation. During warm weather P. umbilicalis is often bleached light brown and sticks to the rock as it dries out. On southern shores it may be absent during the summer on all but the most exposed shores, as it dies back leaving a barnacle and lichen dominated community. In the cooler north the P. umbilicalis covering persists throughout the year. Porphyra linearis can also be found in the among the P. umbilicalis during the late winter and spring.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Pelvetia canaliculata
Algae Porphyra linearis
Algae Porphyra umbilicalis
Invertebrates Chthamalus montagui
Invertebrates Littorina saxatilis
Invertebrates Melarhaphe neritoides
Invertebrates Mytilus edulis
Invertebrates Patella vulgata
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Pelvetia canaliculata Algae
Porphyra linearis Algae
Porphyra umbilicalis Algae
Chthamalus montagui Invertebrates
Littorina saxatilis Invertebrates
Melarhaphe neritoides Invertebrates
Mytilus edulis Invertebrates
Patella vulgata Invertebrates
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) B3.1131 Verrucaria maura and sparse barnacles on exposed littoral fringe rock same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 B3.1131 Verrucaria maura and sparse barnacles on exposed littoral fringe rock same
EUNIS Habitat Classification 200308 B3.1131 Verrucaria maura and Porphyra umbilicalis on very exposed littoral fringe rock narrower
EUNIS Habitat Classification 200308 B3.1132 Verrucaria maura and sparse barnacles on exposed littoral fringe rock narrower
EUNIS Habitat Classification 200202 B3.1131 Verrucaria maura and Porphyra umbilicalis on very exposed littoral fringe rock narrower
EUNIS Habitat Classification 200202 B3.1132 Verrucaria maura and sparse barnacles on exposed littoral fringe rock narrower
EUNIS Habitat Classification 199910 B3.1132 Verrucaria maura and sparse barnacles on exposed littoral fringe rock narrower
EUNIS Habitat Classification 199910 B3.1131 Verrucaria maura and Porphyra umbilicalis on very exposed littoral fringe rock narrower
MNCR BioMar 97.06 (Britain & Ireland) LR.L.Ver.B Verrucaria maura and sparse barnacles on exposed littoral fringe rock narrower
MNCR BioMar 97.06 (Britain & Ireland) LR.L.Ver.Por Verrucaria maura and Porphyra umbilicalis on very exposed littoral fringe rock narrower
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