Lithothamnion corallioides maerl beds on infralittoral muddy gravel
|Within Vocab||Marine Habitat Classification for Britain and Ireland Version 97.06|
|Definition||Live maerl beds in sheltered, silty conditions which are dominated by Lithothamnion corallioides with a variety of foliose and filamentous seaweeds. Live maerl is at least common but there may be noticeable amounts of dead maerl gravel and pebbles. Other species of maerl, such as Phymatolithon calcareum and Phymatolithon purpureum, may also occur as a less abundant component. Species of seaweed such as Dictyota dichotoma, Halarachnion ligulatum, Gracilaria verrucosa and Ulva spp. are often present, although are not restricted to this biotope, whereas Dudresnaya verticillata and Cutleria multifida tend not to occur on other types of maerl beds. The anemones Anthopleura ballii, Anemonia viridis and Cereus pedunculatus and the fan worm Myxicola infundibulum are typically found in IMX.Lcor whereas Echinus esculentus tends to occur more in other types of maerl. IMX.Lcor has a south-western distribution in Britain and Ireland. Sheltered, stable, fully saline maerl beds in the north of Great Britain (where L. corallioides has not been confirmed to occur) may need to be described as an analogous biotope to IMX.Lcor (see IGS.Phy).|
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