Description of biotope or habitat type
Gracilechinus acutus norvegicus assemblage on Atlantic mid bathyal mud
Physical habitat description
|Salinity||Full (30-35 ppt)|
|Zone||Atlantic mid bathyal|
|Depth Band||Biotope depth range 600 - 1300 m (based on zone); assemblage recorded from 150 - 1400 m|
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.
- 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
This biotope consists of aggregations of Gracilechinus acutus norvegicus (previously Echinus acutus norvegicus) on mud substrate. Gage (1986) reports this assemblage from 700-1400m on pelagic ooze and suggests it is present in a ribbon-like distribution around the continental margin of Europe down to about 1400m. Le Danois also describes this assemblage from 150m-500+ but emphasises that shallower than 500m Spatangus raschi dominates and below Gracilechinus acutus norvegicus dominates. The same epifaunal assemblage is also found on sand and in the lower bathyal but associated infauna are likely to differ. Characterising species listed refer to all Gracilechinus acutus norvegicus assemblages not just those found associated with the zone and substrate specified in this biotope.
No situation data available.
No temporal variation data available.
|Taxon||% of core records where taxon was recorded|
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