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 > A1.442 - Green algal films on upper and mid-shore cave walls and ceilings

Green algal films on upper and mid-shore cave walls and ceilings

English name: Green algal films on upper and mid-shore cave walls and ceilings

Description (English)

The upper walls and ceilings of upper and mid-shore hard and soft rock (chalk) dominated by a band of green algal films (or 'stains'). Other encrusting algae including the non-calcified Hildenbrandia rubra may be present. In chalk caves, on the east and south-east coasts of England, a distinctive assemblage of species occurs, including the brown alga Pilinia maritima and the bright green algae Pseudendoclonium submarinum and Entocladia perforans that often covers the cave ceilings. Fauna is generally sparse and limited to limpets such as Patella vulgata and the winkle Littorina saxatilis. The species forming a green algal film that covers upper shore caves in Berwickshire were not identified. More information required to validate this biotope description.
Situation: This biotope is situated above the zones of units A1.444 or A1.445, extending to cover the upper walls and ceilings of caves. This unit can be found at the entrances to caves and through to the darkest areas at the back and is often found above a zone of A1.443. In hard rock caves however, the green and brown algae (A1.443) or Haptophyceae (A1.441) occur as separate zones or A1.442 may occur on its own.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code A1.442
Bern Convention Included in a Resolution 4 habitat type at a higher level (A1.44)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Hildenbrandia rubra
Algae Pseudendoclonium submarinum
Invertebrates Littorina saxatilis
Invertebrates Patella vulgata
Species scientific name English common name Species group
Hildenbrandia rubra Algae
Pseudendoclonium submarinum Algae
Littorina saxatilis Invertebrates
Patella vulgata Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.FLR.CvOv.GCv Green algal films on upper and mid-shore cave walls and ceilings source
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A1.442 Green algal films on upper and mid-shore cave walls and ceilings same
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