Biodiversity & Conservation

Antedon spp., solitary ascidians and fine hydroids on sheltered circalittoral rock

CR.SCR.BrAs.AntAsH


SCR.AntAsH

Image Keith Hiscock - Circalittoral rock with Antedon bifida, hydroids and occasional solitary sea squirts. Image width ca 60 cm.
Image copyright information

Distribution map

CR.SCR.BrAs.AntAsH recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)


  • EC_Habitats

Habitat sensitivity

Physical Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Substratum Loss High Moderate Moderate Major decline Low
Smothering High High Moderate Decline Low
Increase in suspended sediment Low Immediate Not sensitive No change Low
Decrease in suspended sediment Low Very high Very low No change Low
Desiccation Not relevant Not relevant Not relevant Not relevant Not relevant
Increase in emergence regime Not relevant Not relevant Not relevant Not relevant Not relevant
Decrease in emergence regime Not relevant Not relevant Not relevant Not relevant Not relevant
Increase in water flow rate High High Moderate Decline Low
Decrease in water flow rate High High Moderate Major decline Moderate
Increase in temperature Low High Low No change Very low
Decrease in temperature Intermediate High Low Minor decline Very low
Increase in turbidity Tolerant Not relevant Not sensitive Not relevant Not relevant
Decrease in turbidity Tolerant Not relevant Not sensitive Not relevant Not relevant
Increase in wave exposure High High Moderate Decline Moderate
Decrease in wave exposure Tolerant Not relevant Not sensitive Not relevant Moderate
Noise Tolerant Not relevant Not sensitive Not relevant Moderate
Visual Presence Tolerant Not relevant Not sensitive Not relevant Moderate
Abrasion & physical disturbance High High Moderate Decline Low
Displacement High High Moderate Major decline Low

Chemical Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Synthetic compound contamination High High Moderate Decline Low
Heavy metal contamination Low High Low Minor decline Very low
Hydrocarbon contamination High High Moderate Decline Low
Radionuclide contamination Insufficient information Insufficient information Insufficient information Insufficient Information Not relevant
Changes in nutrient levels Low High Low Minor decline Low
Increase in salinity High High Moderate Major decline Very low
Decrease in salinity Intermediate High Low Decline Very low
Changes in oxygenation Intermediate High Low Decline Very low

Biological Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Introduction of microbial pathogens/parasites Low High Low Low
Introduction of non-native species Low High Low No change Moderate
Extraction of this species Not relevant Not relevant Not relevant Not relevant Moderate
Extraction of other species Not relevant Not relevant Not relevant Not relevant Not relevant

Species used to indicate biotope intolerance

Physical factors

Antedon bifida
Important characterizing
Nemertesia ramosa
Important characterizing
Ciona intestinalis
Important characterizing
Clavelina lepadiformis
Important characterizing
Substratum LossHighHighHighHigh
SmotheringHighIntermediateIntermediateHigh
Increase in suspended sedimentLowIntermediateLowIntermediate
Decrease in suspended sedimentLow
DesiccationHighHighIntermediateHigh
Increase in emergence regimeHighHighHighHigh
Decrease in emergence regimeTolerant
Increase in water flow rateHighIntermediateLowLow
Decrease in water flow rateHigh
Increase in temperatureIntermediateInsufficient informationIntermediateIntermediate
Decrease in temperatureInsufficient information
Increase in turbidityLowTolerantTolerantTolerant
Decrease in turbidityTolerant*
Increase in wave exposureHighHighIntermediateIntermediate
Decrease in wave exposureTolerant
NoiseTolerantTolerantTolerantTolerant
Visual PresenceTolerantTolerantTolerantTolerant
Abrasion & physical disturbanceHighIntermediateHighHigh
DisplacementLowHighHighHigh

Chemical factors

Antedon bifida
Important characterizing
Nemertesia ramosa
Important characterizing
Ciona intestinalis
Important characterizing
Clavelina lepadiformis
Important characterizing
Synthetic compound contaminationHighInsufficient informationInsufficient informationInsufficient information
Heavy metal contaminationIntermediateInsufficient informationInsufficient informationTolerant
Hydrocarbon contaminationHighInsufficient informationInsufficient informationInsufficient information
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsInsufficient informationInsufficient informationTolerant*Insufficient information
Increase in salinityHighInsufficient informationLowLow
Decrease in salinityHigh
Changes in oxygenationIntermediateInsufficient informationLowLow

Biological factors

Antedon bifida
Important characterizing
Nemertesia ramosa
Important characterizing
Ciona intestinalis
Important characterizing
Clavelina lepadiformis
Important characterizing
Introduction of microbial pathogens/parasitesLowInsufficient informationInsufficient informationInsufficient information
Introduction of non-native speciesTolerantInsufficient informationIntermediateTolerant
Extraction of this speciesIntermediateNot relevantNot relevantNot relevant
Extraction of other speciesTolerantTolerantTolerantTolerant

Species used to indicate biotope recoverability

Physical factors

Antedon bifida
Important characterizing
Nemertesia ramosa
Important characterizing
Ciona intestinalis
Important characterizing
Clavelina lepadiformis
Important characterizing
Substratum LossHighModerateHighModerate
SmotheringHighVery highVery highModerate
Increase in suspended sedimentImmediateImmediateImmediateHigh
Decrease in suspended sedimentVery high
DesiccationHighModerateVery highModerate
Increase in emergence regimeHighModerateHighModerate
Decrease in emergence regimeHigh
Increase in water flow rateHighHighImmediateVery high
Decrease in water flow rateHigh
Increase in temperatureHighInsufficient informationVery highHigh
Decrease in temperatureInsufficient information
Increase in turbidityVery highNot relevantNot relevantNot relevant
Decrease in turbidityVery high
Increase in wave exposureHighModerateVery highHigh
Decrease in wave exposureNot relevant
NoiseNot relevantNot relevantNot relevantNot relevant
Visual PresenceNot relevantNot relevantNot relevantNot relevant
Abrasion & physical disturbanceHighHighHighModerate
DisplacementImmediateModerateHighModerate

Chemical factors

Antedon bifida
Important characterizing
Nemertesia ramosa
Important characterizing
Ciona intestinalis
Important characterizing
Clavelina lepadiformis
Important characterizing
Synthetic compound contaminationHighInsufficient informationInsufficient informationNot relevant
Heavy metal contaminationHighInsufficient informationInsufficient informationNot relevant
Hydrocarbon contaminationHighInsufficient informationInsufficient informationNot relevant
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient informationNot relevant
Changes in nutrient levelsInsufficient informationInsufficient informationNot relevantNot relevant
Increase in salinityHighInsufficient informationImmediateImmediate
Decrease in salinityHigh
Changes in oxygenationHighInsufficient informationImmediateImmediate

Biological factors

Antedon bifida
Important characterizing
Nemertesia ramosa
Important characterizing
Ciona intestinalis
Important characterizing
Clavelina lepadiformis
Important characterizing
Introduction of microbial pathogens/parasitesHighInsufficient informationInsufficient informationNot relevant
Introduction of non-native speciesNot relevantInsufficient informationVery highNot relevant
Extraction of this speciesHighNot relevantNot relevantNot relevant
Extraction of other speciesNot relevantNot relevantNot relevantNot relevant

This review can be cited as follows:

Hill, J.M. 2001. Antedon spp., solitary ascidians and fine hydroids on sheltered circalittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 17/09/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=313&code=1997>