|Basic Information||Biotope classification||Ecology||Habitat preferences and distribution||Species composition||Sensitivity||Importance|
Image Jon Davies - Cobbles with dense Pomatoceros species (ECR.PomByC). Image width ca 50 cm.
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CR.ECR.EFa.PomByC recorded () and expected () distribution in Britain and Ireland (see below)
|Distribution of biotope in Britain and Ireland||Scattered records from Fair Isle, Orkney; the rivers Teign and Dart, Devon; Lundy; the Bishops & Clerks, Skomer and off Dinas Head in Pembrokeshire; Cardigan Bay, Lleyn Peninsula, Bardsey and Menai Straits north Wales; Donlus Bay, south west Ireland; Tiree and Loch Roag, Isle of Lewis in west Scotland and St Kilda.|
|National importance||Not available|
For a full description of this biotope including characterizing species, distribution, survey information and references visit JNCC
Cobbles and pebbles with Balanus crenatus, Pomatoceros and a few bryozoan and coralline algal crusts are often found at the base of exposed cliff faces where scour action prevents colonization by more delicate species. Occasionally in tide-swept conditions tufts of hydroids such as Sertularia argentea and Hydrallmania falcata are present. This biotope often grades into MCR.Flu.SerHyd which is characterized by large amounts of the above hydroids on stones also covered in Pomatoceros and barnacles. The main difference here is that MCR.Flu.SerHyd seems to develop on more stable, consolidated cobbles and pebbles in moderate tides - these stones may be disturbed in the winter and therefore long-lived species are not found. (Information taken from the Marine Biotope Classification for Britain and Ireland, Version 97.06: Connor et al., 1997a, b).
This review can be cited as follows:
Tyler-Walters, H. 2002. Pomatoceros triqueter, Balanus crenatus and bryozoan crusts on mobile circalittoral cobbles and pebbles. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 26/01/2015]. Available from: <http://www.marlin.ac.uk/habitatsbasicinfo.php?habitatid=177&code=1997>