EUNIS habitat classification 2017 > M - Marine benthic habitats > MC3 - Circalittoral coarse sediment > MC32 - Atlantic circalittoral coarse sediment > MC321 - Faunal communities of Atlantic circalittoral coarse sediment > MC3211 - Pomatoceros triqueter with barnacles and bryozoan crusts on Atlantic circalittoral unstable cobbles and pebbles

Pomatoceros triqueter with barnacles and bryozoan crusts on Atlantic circalittoral unstable cobbles and pebbles

Description (English)

This biotope is characterised by a few ubiquitous robust and/or fast growing ephemeral species which are able to colonise pebbles and unstable cobbles and slates which are regularly moved by wave and tidal action. The main cover organisms tend to be restricted to calcareous tube worms such as Pomatoceros triqueter (or P. lamarcki), small barnacles including Balanus crenatus and Balanus balanus, and a few bryozoan and coralline algal crusts. Scour action from the mobile substratum prevents colonisation 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 MC4-214 which is characterised by large amounts of the above hydroids on stones also covered in Pomatoceros and barnacles. The main difference here is that MC4-214, seems to develop on more stable, consolidated cobbles and pebbles or larger stones set in sediment in moderate tides. These stones may be disturbed in the winter and therefore long-lived and fragile species are not found.
Situation: This biotope is found on exposed open coasts as well as at the entrance to marine inlets.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MC3211
Relation to Resolution 4 habitat type (used for designation of Emerald sites)

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Balanus balanus
Invertebrates Balanus crenatus
Invertebrates Hydrallmania falcata
Invertebrates Pomatoceros triqueter
Invertebrates Sertularia argentea
Species scientific name English common name Species group
Balanus balanus Invertebrates
Balanus crenatus Invertebrates
Hydrallmania falcata Invertebrates
Pomatoceros triqueter Invertebrates
Sertularia argentea Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A5.141 Pomatoceros triqueter with barnacles and bryozoan crusts on unstable circalittoral cobbles and pebbles same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A5.131 Pomatoceros triqueter with barnacles and bryozoan crusts on unstable circalittoral cobbles and pebbles same
EUNIS Habitat Classification 200308 A4.132 Pomatoceros triqueter with barnacles and bryozoan crusts on unstable circalittoral cobbles and pebbles same
EUNIS Habitat Classification 200202 A4.132 Pomatoceros triqueter, Balanus crenatus and bryozoan crusts on mobile circalittoral cobbles and pebbles same
EUNIS Habitat Classification 199910 A4.142 Pomatoceros triqueter, Balanus crenatus and bryozoan crusts on mobile circalittoral cobbles and pebbles same
MNCR BioMar 97.06 (Britain & Ireland) ECR.EFa.PomByC Pomatoceros triqueter, Balanus crenatus and bryozoan crusts on mobile circalittoral cobbles and pebbles same
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