Skip to Content

Marine Habitat Classification


Description of biotope or habitat type

To understand more about what this page is describing, see How to use the classification. See also How to cite.

   Lagis koreni and Phaxas pellucidus in circalittoral sandy mud


Habitat (physical) description

Salinity Full (30-35 ppt)
Wave exposure Exposed, Moderately exposed
Tidal streams Strong (3-6 kn), Moderately strong (1-3 kn), Weak (>1 kn), Very weak (negligible)
Substratum Sandy mud
Zone Circalittoral
Depth Band 10-20 m, 20-30 m, 30-50 m, 50-100 m
Other Features

Download comparative physical and biological data. The comparative tables enable a rapid comparison of the species composition and principal physical characteristics between a given set of biotopes.

Distribution of habitat SS.SMu.CSaMu.LkorPpel <I>Lagis koreni</I> and <I>Phaxas pellucidus</I> in circalittoral sandy mud

  • Records used to define the biotope (core records)
  • Other records assigned to this biotope, marked as 'certain'
  • Other records assigned to this biotope, marked as 'uncertain'
  • Predicted extent of the level 3 (for sublittoral rock & deep sea) or 4 (for sublittoral sediment) habitat

Point data based on records in the UK Marine Recorder Snapshot. Predicted habitat extent is from UKSeaMap.

Description

In stable circalittoral sandy mud dense populations of the tube building polychaete Lagis koreni may occur. Other species found in this habitat typically include bivalves such as Phaxas pellucidus, Mysella bidentata and Abra alba and polychaetes such as Mediomastus fragilis, Spiophanes bombyx, Owenia fusiformis and Scalibregma inflatum. At the sediment surface easily visible fauna include Lagis koreni and Ophiura ophiura. Lagis koreni is an important source of food for commercially important demersal fish, especially dab and plaice (Macer, 1967; Lockwood, 1980 and Basimi & Grove, 1985).

Situation

No situation data available.

Temporal variation

In some areas e.g. Liverpool Bay, AalbNuc and LkorPpel have exhibited cyclical behaviour with the community periodically switching from one biotope to another - possibly in relation to dredge spoil disposal (Rees et al. 1992) along with other environmental and biological factors. Both Lagis koreni and Phaxas pellucidus, are capable of tolerating sudden increases in the deposition of sediment and often dominate such areas following such an event. Indeed it is likely that the two biotopes are merely different aspects of the same community as Lagis koreni is often recorded with high densities of Abra alba (Eagle 1975; Rees and Walker 1983). Densities of mature populations of L. koreni may exceed 1000m-2

Characterising Species

Taxon Relative importance of taxon for defining this community (%) Typical abundance - SACFOR scale % of core records where taxon was recorded
Cerianthus lloydii 2 Rare 21-40 %
Nemertea 5 Abundant 81-100 %
Nereiphylla lutea 2 Abundant 61-80 %
Lumbrineris gracilis 2 Common 61-80 %
Prionospio ehlersi 1 Common 41-60 %
Spio 2 Frequent 61-80 %
Spiophanes bombyx 7 Common 81-100 %
Chaetopterus variopedatus 1 Rare 21-40 %
Chaetozone 1 Common 61-80 %
Mediomastus fragilis 5 Frequent 81-100 %
Scalibregma inflatum 3 Common 81-100 %
Owenia fusiformis 3 Common 81-100 %
Amphictene auricoma 1 Common 41-60 %
Lagis koreni 8 Abundant 81-100 %
Lagis koreni 22 61-80 %
Lanice conchilega 8 Frequent 21-40 %
Pariambus typicus 2 Frequent 81-100 %
Pseudocuma longicornis 1 Frequent 41-60 %
Pagurus bernhardus 4 Frequent 21-40 %
Macropodia rostrata 1 Rare 21-40 %
Corystes cassivelaunus 1 Rare 21-40 %
Liocarcinus depurator 1 Rare 21-40 %
Buccinum undatum 3 Occasional 21-40 %
Nucula nitidosa 1 Frequent 61-80 %
Mysella bidentata 6 Common 81-100 %
Phaxas pellucidus 6 Abundant 81-100 %
Abra alba 4 Common 81-100 %
Phoronis 2 Common 61-80 %
Asterias rubens 6 Occasional 41-60 %
Ophiuroidea 2 Abundant 61-80 %
Amphiura filiformis 1 Abundant 41-60 %
Ophiura albida 6 Common 21-40 %
Ophiura ophiura 20 Common 41-60 %
Psammechinus miliaris 1 Rare 21-40 %
Echinocardium cordatum 4 Frequent 21-40 %
Callionymus lyra 2 Rare 21-40 %
Pomatoschistus 13 Frequent 41-60 %
Pleuronectidae 3 Rare 21-40 %

Similar biotopes

SS.SSa.CMuSa.AalbNuc
The current biotope is closely related to AalbNuc but tends to occur in muddier substratum


Back to top