Description of biotope or habitat type
Ampharete falcata turf with Parvicardium ovale on cohesive muddy sediment near margins of deep stratified seas
Physical habitat description
|Salinity||Full (30-35 ppt)|
|Tidal streams||Weak (>1 kn)|
|Substratum||Cohesive sandy mud|
|Depth Band||50-100 m|
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- 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
Dense stands of Ampharete falcata tubes which protrude from muddy sediments, appearing as a turf or meadow in localised areas. These areas seem to occur on a crucial point on a depositional gradient between areas of tide-swept mobile sands and quiescent stratifying muds. Dense populations of the small bivalve Parvicardium ovale occur in the superficial sediment. Other infauna in this diverse biotope includes Lumbrineris scopa, Levinsenia sp., Prionospio steenstrupi, Diplocirrus glaucus and Praxillella affinis although a wide variety of other infaunal species may also be found. Both the brittlestars Amphiura filiformis and Amphiura chiajei may be present together with Nephrops norvegicus in higher abundance than the BlyrAchi or AfilEcor biotopes. Substantial populations of mobile epifauna such as Pandalus montagui and smaller fish also occur, together with those that can cling to the tubes, such as Macropodia spp. A similar turf of worm tubes formed by the maldanid polychaete Melinna cristata has been recorded from Northumberland (Buchanan 1963). Nephrops trawling may severely damage this biotope and it is possible that such activity has destroyed examples of this biotope in the Irish Sea (E.I.S. Rees pers. comm. 2002).
No situation data available.
No temporal data available.
|Taxon||Typical abundance - SACFOR scale|
|Ampharete falcata||Super abundant|
|Parvicardium ovale||Super abundant|
|Amphiura chiajei||Super abundant|
Similar biotopes or habitat types
Classification history of this biotope or habitat type