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Marine Habitat Classification


Description of biotope or habitat type

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   Gracilechinus acutus norvegicus assemblage on Atlantic lower bathyal mud


Habitat (physical) description

Salinity Full (30-35 ppt)
Wave exposure
Tidal streams
Substratum Mud
Zone Atlantic lower bathyal
Depth Band Biotope depth range 1300 - 2100 m (based on zone); assemblage recorded from 150 - 1400 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 M.AtLB.Mu.UrcCom.GraAcu <i>Gracilechinus acutus norvegicus</i> assemblage on Atlantic lower bathyal 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

This biotope consistis 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 coarse sediment in the upper and mid bathyal but associated infauna are likely to differ.

Situation

No situation data available.

Temporal variation

No temporal variation data available.

Characterising Species

Taxon
Gracilechinus acutus
Laetmogone violacea
Benthogone rosea
Spatangus raschi
Nematocarcinus ensifer
Pontophilus norvegicus
Geryon trispinosus
Nephropsis atlantica
Ophiocten gracilis
Calveriosoma hystrix
Bathyplotes natans

Similar biotopes

M.AtLB.Sa.UrcCom.GraAcu
The same epifaunal assemblage on sand. Associated infauna are likely to differ.

M.AtMB.Mu.UrcCom.GraAcu
The same epifaunal assemblage in the mid bathyal. Associated infauna are likely to differ.

M.AtMB.Sa.UrcCom.GraAcu
The same epifaunal assemblage in the mid bathyal on sand. Associated infauna are likely to differ.

M.AtUB.Sa.UrcCom.GraAcu
The same epifaunal assemblage in the upper bathyal on sand. Associated infauna are likely to differ.

M.AtLB.Mu.UrcCom.GraAle
The dominant urchin species is Gracilechinus alexandri.

M.AtUA.Mu.UrcCom.GraAle
Occurs in the upper abyssal. The dominant urchin species is Gracilechinus alexandri.


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