Biodiversity & Conservation

Faunal and algal crusts, Echinus esculentus, sparse Alcyonium digitatum and grazing-tolerant fauna on moderately exposed circalittoral rock

CR.MCR.EcCr.FaAlCr.Pom


MCR.FaAlC

Image David Connor - Faunal and algal crusts, Echinus esculentus, sparse Alcyonium digitatum, Abietinaria abietina and other grazing-tolerant fauna on moderately exposed circalittoral rock. Image width ca 1m.
Image copyright information

Distribution map

CR.MCR.EcCr.FaAlCr.Pom 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 High Moderate Major decline Low
Smothering Intermediate High Low Minor decline Low
Increase in suspended sediment Low Very high Very low No change Low
Decrease in suspended sediment Tolerant Not relevant Not sensitive Not relevant Not relevant
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 Minor decline Low
Decrease in water flow rate Not relevant Not relevant Not relevant Not relevant Not relevant
Increase in temperature Intermediate High Low Minor decline Low
Decrease in temperature Low Very high Very low No change Low
Increase in turbidity Tolerant Not relevant Not sensitive Not relevant Not relevant
Decrease in turbidity Tolerant Not relevant Not sensitive Rise Very low
Increase in wave exposure Intermediate High Low Minor decline Low
Decrease in wave exposure Tolerant Not relevant Not sensitive Minor decline Low
Noise Tolerant Not relevant Not sensitive No change High
Visual Presence Tolerant Not relevant Not sensitive No change High
Abrasion & physical disturbance High Very high Low Rise Low
Displacement High Very high Low Minor decline Not relevant

Chemical Factors

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

Biological Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Introduction of microbial pathogens/parasites High High Moderate Very low
Introduction of non-native species Insufficient information None Insufficient information Insufficient Information Not relevant
Extraction of this species Intermediate High Low Rise Low
Extraction of other species Not relevant Not relevant Not relevant Not relevant Not relevant

Species used to indicate biotope intolerance

Physical factors

Echinus esculentus
Key functional
Alcyonium digitatum
Important characterizing
Lithophyllum incrustans
Important other
Pomatoceros triqueter
Important other
Substratum LossHighHighHighHigh
SmotheringIntermediateIntermediateLowHigh
Increase in suspended sedimentLowLowLowLow
Decrease in suspended sedimentTolerant*Low
DesiccationIntermediateNot relevantHighIntermediate
Increase in emergence regimeLowNot relevantHighIntermediate
Decrease in emergence regimeTolerantTolerant*
Increase in water flow rateLowTolerant*LowTolerant*
Decrease in water flow rateIntermediateLowTolerant
Increase in temperatureIntermediateLowTolerantTolerant*
Decrease in temperatureLowTolerantIntermediate
Increase in turbidityLowLowLowTolerant
Decrease in turbidityTolerant*Tolerant
Increase in wave exposureLowTolerantTolerantLow
Decrease in wave exposureIntermediateLowTolerant
NoiseTolerantTolerantTolerantTolerant
Visual PresenceLowTolerantTolerantTolerant
Abrasion & physical disturbanceIntermediateIntermediateIntermediateIntermediate
DisplacementLowHighLowLow

Chemical factors

Echinus esculentus
Key functional
Alcyonium digitatum
Important characterizing
Lithophyllum incrustans
Important other
Pomatoceros triqueter
Important other
Synthetic compound contaminationHighIntermediateHighInsufficient information
Heavy metal contaminationHighInsufficient informationInsufficient informationInsufficient information
Hydrocarbon contaminationHighLowHighInsufficient information
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsTolerant*LowLowInsufficient information
Increase in salinityIntermediateIntermediateInsufficient informationTolerant
Decrease in salinityIntermediateHigh
Changes in oxygenationIntermediateHighInsufficient informationInsufficient information

Biological factors

Echinus esculentus
Key functional
Alcyonium digitatum
Important characterizing
Lithophyllum incrustans
Important other
Pomatoceros triqueter
Important other
Introduction of microbial pathogens/parasitesIntermediateInsufficient informationInsufficient informationInsufficient information
Introduction of non-native speciesNot relevantInsufficient informationInsufficient informationTolerant
Extraction of this speciesIntermediateNot relevantNot relevantNot relevant
Extraction of other speciesIntermediateIntermediateIntermediateNot relevant

Species used to indicate biotope recoverability

Physical factors

Echinus esculentus
Key functional
Alcyonium digitatum
Important characterizing
Lithophyllum incrustans
Important other
Pomatoceros triqueter
Important other
Substratum LossHighHighLowHigh
SmotheringHighHighVery highHigh
Increase in suspended sedimentVery highVery highVery highHigh
Decrease in suspended sedimentNot relevantHigh
DesiccationHighNot relevantLowHigh
Increase in emergence regimeVery highNot relevantLowHigh
Decrease in emergence regimeNot relevantNot relevant
Increase in water flow rateVery highNot relevantVery highNot relevant
Decrease in water flow rateHighVery highNot relevant
Increase in temperatureHighHighNot relevantNot relevant
Decrease in temperatureHighNot relevantHigh
Increase in turbidityVery highVery highVery highNot relevant
Decrease in turbidityNot relevantNot relevant
Increase in wave exposureVery highNot relevantNot relevantHigh
Decrease in wave exposureHighImmediateNot relevant
NoiseNot relevantNot relevantNot relevantNot relevant
Visual PresenceImmediateNot relevantNot relevantNot relevant
Abrasion & physical disturbanceHighHighHighHigh
DisplacementVery highHighVery highHigh

Chemical factors

Echinus esculentus
Key functional
Alcyonium digitatum
Important characterizing
Lithophyllum incrustans
Important other
Pomatoceros triqueter
Important other
Synthetic compound contaminationHighHighLowNot relevant
Heavy metal contaminationHighInsufficient informationNot relevantNot relevant
Hydrocarbon contaminationHighHighHighNot relevant
Radionuclide contaminationInsufficient informationInsufficient informationNot relevantNot relevant
Changes in nutrient levelsNot relevantHighHighNot relevant
Increase in salinityHighHighNot relevantNot relevant
Decrease in salinityHighHigh
Changes in oxygenationHighHighNot relevantNot relevant

Biological factors

Echinus esculentus
Key functional
Alcyonium digitatum
Important characterizing
Lithophyllum incrustans
Important other
Pomatoceros triqueter
Important other
Introduction of microbial pathogens/parasitesHighInsufficient informationNot relevantNot relevant
Introduction of non-native speciesNot relevantInsufficient informationNot relevantNot relevant
Extraction of this speciesHighNot relevantNot relevantNot relevant
Extraction of other speciesHighHighHighNot relevant

This review can be cited as follows:

Tyler-Walters, H. 2002. Faunal and algal crusts, Echinus esculentus, sparse Alcyonium digitatum and grazing-tolerant fauna on moderately exposed circalittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 24/04/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=337&code=2004>