Neocrania anomala, Dendrodoa grossularia and Sarcodictyon roseum on variable salinity circalittoral rock

English name: Neocrania anomala, Dendrodoa grossularia and Sarcodictyon roseum on variable salinity circalittoral rock

Quick facts

EUNIS habitat type code A4.3142
Bern Convention Included in a Resolution 4 habitat type at a higher level (A4)

Description (English)

This variant typically occurs on lower circalittoral silty, bedrock or boulder cliffs and ridges in very wave-sheltered fjordic sealochs subjected to variable salinity regimes (such as Loch Etive, Scotland). In these sheltered conditions, there are frequently dense populations of the ascidian Dendrodoa grossularia, the brachiopod Neocrania anomala and to a lesser extent, the brachiopod Terebratulina retusa, which are able to tolerate the variable salinity. Other solitary ascidians that may be present include Ciona intestinalis, Corella parallelogramma, Ascidiella scabra, Ascidia mentula, Ascidia virginea and Polycarpa pomaria. The anemone Protanthea simplex is occasionally seen, although to a lesser extent than in unit A4.314, possibly due to the variable salinity. The hydroids Bougainvillia ramosa and Lafoea dumosa, the cup-coral Caryophilia smithii and Sarcodictyon roseum are occasionally present. The tubes formed by the polychaete Sabella pavonina may be observed standing erect from the rock surface. The rest of the rock surface is usually covered by encrusting red algae and the polychaete Pomatoceros triqueter and Protula tubularia. The sea cucumber Psolus phantapus may be found on the underside of boulders. Other species such as the hermit crab Pagurus bernhardus and the spider crab Hyas araneus may be found amongst the rock/boulders. The starfish Asterias rubens, Crossaster papposus, and Henricia spp. and the sea urchin Psammechinus miliaris are also recorded within this variant. The relatively bare, silty rock supports low numbers of a relatively few species. Although barren rock grazed by the sea urchin Echinus esculentus is found in other sea loch biotopes (see units A4.2145 and A4.2146), E.esculentus is virtually absent within A4.3142.
Situation: Due to the variable or reduced salinity conditions present where this biotope is found, you tend to find reduced salinity kelp biotopes above A4.3142, such as A3.322 and A3.323. The very sheltered conditions give rise to muddy sediment slopes or plains beneath A4.314 (A5.3) where species such as the seapen Funiculina quadrangularis, the anemone Cerianthus lloydii and the Norway lobster Nephrops norvegicus are typically abundant.

Source: EUNIS habitat classification

Vegetation types

Relation to vegetation types (syntaxa)

Not available

Species mentioned in habitat description

Invertebrates Ascidia mentula
Invertebrates Ascidia virginea
Invertebrates Ascidiella scabra
Invertebrates Asterias rubens
Invertebrates Bougainvillia ramosa
Invertebrates Ciona intestinalis
Invertebrates Corella parallelogramma
Invertebrates Crossaster papposus
Invertebrates Dendrodoa grossularia
Invertebrates Echinus esculentus
Invertebrates Funiculina quadrangularis
Invertebrates Hyas araneus
Invertebrates Lafoea dumosa
Invertebrates Neocrania anomala
Invertebrates Nephrops norvegicus
Invertebrates Pagurus bernhardus
Invertebrates Polycarpa pomaria
Invertebrates Pomatoceros triqueter
Invertebrates Protanthea simplex
Invertebrates Protula tubularia
Invertebrates Psammechinus miliaris
Invertebrates Psolus phantapus
Invertebrates Sabella pavonina
Invertebrates Sarcodictyon roseum
Invertebrates Terebratulina retusa
Species scientific name English common name Species group
Ascidia mentula Invertebrates
Ascidia virginea Invertebrates
Ascidiella scabra Invertebrates
Asterias rubens Invertebrates
Bougainvillia ramosa Invertebrates
Ciona intestinalis Invertebrates
Corella parallelogramma Invertebrates
Crossaster papposus Invertebrates
Dendrodoa grossularia Invertebrates
Echinus esculentus Invertebrates
Funiculina quadrangularis Invertebrates
Hyas araneus Invertebrates
Lafoea dumosa Invertebrates
Neocrania anomala Invertebrates
Nephrops norvegicus Invertebrates
Pagurus bernhardus Invertebrates
Polycarpa pomaria Invertebrates
Pomatoceros triqueter Invertebrates
Protanthea simplex Invertebrates
Protula tubularia Invertebrates
Psammechinus miliaris Invertebrates
Psolus phantapus Invertebrates
Sabella pavonina Invertebrates
Sarcodictyon roseum Invertebrates
Terebratulina retusa Invertebrates

Other classifications

Classification Code Habitat type name Relationship type
Marine Habitat Classification Britain/Ireland 0405 CR.LCR.BrAs.NeoPro.VS <I>Neocrania anomala</I>, <I>Dendrodoa grossularia</I> and <I>Sarcodictyon roseum</I> on variable salinity circalittoral rock source
CORINE Land Cover 5.2.3. Sea and ocean n/a
For relation to plant communities (syntaxa), see Vegetation types

History

Classification Code Habitat type name Relationship type
EUNIS Habitat Classification 200410 A4.3142 Neocrania anomala, Dendrodoa grossularia and Sarcodictyon roseum on variable salinity circalittoral rock same
EUNIS Habitat Classification 200308 A3.7152 Neocrania anomala, Dendrodoa grossularia and Sarcodictyon roseum on reduced or low salinity circalittoral rock overlap
EUNIS Habitat Classification 200308 A3.7151 Brachiopods, calcareous tubeworms (Placostegus tridentatus, Hydroides) and sponges on variable salinity circalittoral rock overlap
EUNIS Habitat Classification 200202 A3.7152 Neocrania anomala, Dendrodoa grossularia and Sarcodictyon roseum on reduced or low salinity circalittoral rock overlap
EUNIS Habitat Classification 200202 A3.7151 Brachiopods, calcareous tubeworms (Placostegus tridentatus, Hydroides) and sponges on variable salinity circalittoral rock overlap
EUNIS Habitat Classification 199910 A3.7151 Brachiopods, calcareous tubeworms (Placostegus tridentatus, Hydroides) and sponges on variable salinity circalittoral rock overlap
EUNIS Habitat Classification 199910 A3.7152 Neocrania anomala, Dendrodoa grossularia and Sarcodictyon roseum on reduced or low salinity circalittoral rock overlap
MNCR BioMar 97.06 (Britain & Ireland) SCR.BrAs.NeoPro.CaTw Brachiopods, calcareous tubeworms (Placostegus tridentatus, Hydroides) and sponges on variable salinity circalittoral rock overlap
MNCR BioMar 97.06 (Britain & Ireland) SCR.BrAs.NeoPro.Den Neocrania anomala, Dendrodoa grossularia and Sarcodictyon roseum on reduced or low salinity circalittoral rock overlap
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