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Marine Habitat Classification


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1 result for 'LR.FLR.CvOv.RpurCla'

   LR.FLR.CvOv.RpurCla  Rhodochorton purpureum and Cladophora rupestris on upper to mid-shore cave walls

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 Rhodochorton purpureum. 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 (AudPil) above the AudCrup biotope. Other shade-tolerant red seaweed such as Catenella caespitosa and Lomentaria articulata may occur (but at lower abundance), and where freshwater seepage occurs, Ulva 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.
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