EUNIS habitat classification 2017 > M - Marine benthic habitats > MC2 - Circalittoral biogenic habitat > MC22 - Atlantic circalittoral biogenic habitat > MC223 - Bivalve reefs in the Atlantic circalittoral zone > MC2231 - Modiolus modiolus beds with hydroids and red seaweeds on tide-swept Atlantic circalittoral mixed substrata

Modiolus modiolus beds with hydroids and red seaweeds on tide-swept Atlantic circalittoral mixed substrata

Description (English)

Modiolus beds on mixed substrata (cobbles, pebbles and coarse muddy sediments) in moderately strong currents or wave exposed areas, typically on the open coast but also in tide-swept channels of marine inlets. Ophiothrix fragilis are often common in this biotope along with the calcareous tubes of Pomatoceros triqueter, anemones such as Alcyonium digitatum and Urticina felina and hydroids such as Abietinaria abietina and Sertularia argentea. Buccinum undatum may also be important and in some areas the clam Chlamys varia may be frequent but not in the same abundances as in unit MC2-224. Little information on the infaunal component is given here although it is likely that it is very rich and may highlight more subtle differences in the Modiolus biotopes. This biotope is typified by examples off the north-west Lleyn Peninsula in N Wales and off Co. Down, Northern Ireland.

Source: EUNIS habitat classification

Quick facts

EUNIS habitat type code MC2231
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

Not available

Other classifications

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 2007 (revised descriptions 2012) A5.621 Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type Comment
EUNIS Habitat Classification 200410 A5.621 Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
EUNIS Habitat Classification 200308 A3.643 Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
EUNIS Habitat Classification 200202 A3.643 Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
EUNIS Habitat Classification 199910 A3.643 Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
MNCR BioMar 97.06 (Britain & Ireland) MCR.M.ModT Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata same
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