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 > A1.444 - Audouinella purpurea and Cladophora rupestris on upper to mid-shore cave walls

Audouinella purpurea and Cladophora rupestris on upper to mid-shore cave walls

English name: Audouinella purpurea and Cladophora rupestris on upper to mid-shore cave walls

Quick facts

EUNIS habitat type code A1.444
Bern Convention Included in a Resolution 4 habitat type at a higher level (A1.44)

Description (English)

Vertical and steeply-sloping upper walls at the entrances and inner reaches of upper to mid-shore caves that are partially sheltered from direct wave action characterised by a turf of the 'velvety' red seaweed Audouinella purpurea. Patches of green filamentous seaweed Cladophora rupestris can be present. The fauna is generally limited to limpets Patella spp., the winkle Littorina saxatilis and the barnacle Semibalanus balanoides, while they usually occur in low abundance. Filamentous or crust forming brown seaweeds may occur mixed with A. purpurea, often becoming a zone in its own right (unit A1.443) above this unit. Other shade-tolerant red seaweed such as Catenella caespitosa and Lomentaria articulata may occur (but at lower abundance), and where freshwater seepage occurs, Enteromorpha intestinalis can form patches. Some variation in the species composition of the individual caves must be expected depending on local conditions. A. purpurea can be the only seaweed present in caves on the Thanet coast in south-east England. This biotope is known to occur in hard rock caves in north-east England and chalk caves in south-east England. Received after deadline: A. purpurea has changed name to Rhodochorton purpurea.
Situation: In hard rock caves, this biotope is generally found on the upper walls above units A1.449 and A1.448 and beneath the biotopes dominated by green and/or brown crusts (A1.442; A1.443). In chalk caves, this unit may cover the lower and upper walls, while it is usually found below units A1.442 and/or A1.443.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Algae Catenella caespitosa
Algae Enteromorpha intestinalis
Invertebrates Littorina saxatilis
Algae Lomentaria articulata
Invertebrates Semibalanus balanoides
Species scientific name English common name Species group
Catenella caespitosa Algae
Enteromorpha intestinalis Algae
Littorina saxatilis Invertebrates
Lomentaria articulata Algae
Semibalanus balanoides Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 LR.FLR.CvOv.AudCla <I>Audouinella purpurea</I> and <I>Cladophora rupestris</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 A1.444 Audouinella purpurea and Cladophora rupestris on upper to mid-shore cave walls same
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