EUNIS habitat classification 2012 amended 2019 > A - Marine habitats > A1 - Littoral rock and other hard substrata > A1.4 - Features of littoral rock > A1.44 - Communities of littoral caves and overhangs > A1.445 - Verrucaria mucosa and/or Hildenbrandia rubra on upper to mid shore cave walls

Verrucaria mucosa and/or Hildenbrandia rubra on upper to mid shore cave walls

English name: Verrucaria mucosa and/or Hildenbrandia rubra on upper to mid shore cave walls

Quick facts

EUNIS habitat type code A1.445
Bern Convention Included in a Resolution 4 habitat type at a higher level (A1.44)

Description (English)

The upper walls and ceilings of the entrances and inner reaches of upper shore caves affected by direct wave action (and therefore moistened by sea spray), characterised by a mosaic of the olive green lichen Verrucaria mucosa and the non-calcified encrusting red alga Hildenbrandia rubra. The black lichen Verrucaria maura and red coralline algae can be present, though not dominating. The fauna in these upper shore caves is generally limited, due to problems of desiccation. However, where conditions remain sufficiently moist, and particularly in crevices and fissures, the barnacle Semibalanus balanoides, the limpet Patella vulgata and winkles Littorina saxatilis may occur, particularly towards the rear of the cave. Although the characterising species of this biotope also occur on the shore, they do not generally occur in a distinct band other than in moist dark caves. The turf-forming red seaweed Audouinella purpurea (syn Rhodochorton purpurea) may occasionally occur in low abundance (where A. purpurea covers an extensive area, generally on softer rock such as chalk, the biotope should be recorded as unit A1.444).
Situation: This unit generally occurs on upper walls and ceilings towards the rear of dark, moist caves, but can also occur at cave entrances that are directly affected by sea-spray. Where this unit occurs at cave entrances and to approximately 5 m into the cave, it is usually found above a zone of unit A1.113 and below A1.442 or A1.444. Further into the cave A1.113 is replaced completely by A1.445. There are no records for VmucHil in soft rock caves.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Hildenbrandia rubra
Invertebrates Littorina saxatilis
Invertebrates Patella vulgata
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Hildenbrandia rubra Algae
Littorina saxatilis Invertebrates
Patella vulgata Invertebrates
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.FLR.CvOv.VmucHil <I>Verrucaria mucosa</I> and/or <I>Hildenbrandia rubra</I> on upper to mid shore cave walls source
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A1.445 Verrucaria mucosa and/or Hildenbrandia rubra on upper to mid shore cave walls same
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