Biodiversity & Conservation

Crepidula fornicata and Aphelochaeta marioni in variable salinity infralittoral mixed sediment

SS.IMX.EstMx.CreAph


IMX.CreAph

Image Chris Lumb - Crepidula fornicata and Aphelochaeta marioni in variable salinity infralittoral mixed sediment. Image width ca 60 cm.
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Distribution map

SS.IMX.EstMx.CreAph recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)


  • EC_Habitats
  • UK_BAP

Habitat sensitivity

Physical Factors

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

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 Moderate
Hydrocarbon contamination Intermediate Moderate Moderate Major decline Low
Radionuclide contamination Intermediate High Low Decline High
Changes in nutrient levels Intermediate High Low Minor decline Very low
Increase in salinity Tolerant Not relevant Not sensitive No change High
Decrease in salinity Low Very high Very low No change Low
Changes in oxygenation Intermediate High Low Minor decline Very low

Biological Factors

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

Species used to indicate biotope intolerance

Physical factors

Crepidula fornicata
Important characterizing
Aphelochaeta marioni
Important characterizing
Substratum LossHighHigh
SmotheringLowLow
Increase in suspended sedimentLowTolerant*
Decrease in suspended sedimentLowLow
DesiccationLowNot relevant
Increase in emergence regimeIntermediateIntermediate
Decrease in emergence regimeTolerantTolerant
Increase in water flow rateIntermediateIntermediate
Decrease in water flow rateTolerantTolerant*
Increase in temperatureLowLow
Decrease in temperatureIntermediateLow
Increase in turbidityLowLow
Decrease in turbidityTolerantTolerant
Increase in wave exposureHighHigh
Decrease in wave exposureTolerantTolerant
NoiseTolerantTolerant
Visual PresenceTolerantLow
Abrasion & physical disturbanceIntermediateIntermediate
DisplacementIntermediateTolerant

Chemical factors

Crepidula fornicata
Important characterizing
Aphelochaeta marioni
Important characterizing
Synthetic compound contaminationHighHigh
Heavy metal contaminationIntermediateLow
Hydrocarbon contaminationIntermediateTolerant*
Radionuclide contaminationIntermediateInsufficient information
Changes in nutrient levelsInsufficient informationIntermediate
Increase in salinityTolerantTolerant
Decrease in salinityLowTolerant
Changes in oxygenationIntermediateLow

Biological factors

Crepidula fornicata
Important characterizing
Aphelochaeta marioni
Important characterizing
Introduction of microbial pathogens/parasitesLowLow
Introduction of non-native speciesTolerantInsufficient information
Extraction of this speciesIntermediateNot relevant
Extraction of other speciesTolerant*Intermediate

Species used to indicate biotope recoverability

Physical factors

Crepidula fornicata
Important characterizing
Aphelochaeta marioni
Important characterizing
Substratum LossHighHigh
SmotheringVery highImmediate
Increase in suspended sedimentVery highNot relevant
Decrease in suspended sedimentVery highImmediate
DesiccationVery highNot relevant
Increase in emergence regimeHighHigh
Decrease in emergence regimeNot relevantNot relevant
Increase in water flow rateHighHigh
Decrease in water flow rateNot relevantNot relevant
Increase in temperatureVery highVery high
Decrease in temperatureHighVery high
Increase in turbidityVery highVery high
Decrease in turbidityNot relevantNot relevant
Increase in wave exposureHighHigh
Decrease in wave exposureNot relevantNot relevant
NoiseNot relevantNot relevant
Visual PresenceNot relevantImmediate
Abrasion & physical disturbanceHighHigh
DisplacementHighNot relevant

Chemical factors

Crepidula fornicata
Important characterizing
Aphelochaeta marioni
Important characterizing
Synthetic compound contaminationHighHigh
Heavy metal contaminationHighVery high
Hydrocarbon contaminationHighNot relevant
Radionuclide contaminationHighNot relevant
Changes in nutrient levelsNot relevantHigh
Increase in salinityNot relevantNot relevant
Decrease in salinityVery highNot relevant
Changes in oxygenationHighVery high

Biological factors

Crepidula fornicata
Important characterizing
Aphelochaeta marioni
Important characterizing
Introduction of microbial pathogens/parasitesVery highVery high
Introduction of non-native speciesNot relevantNot relevant
Extraction of this speciesModerateNot relevant
Extraction of other speciesNot relevantHigh

This review can be cited as follows:

Rayment, W.J. 2001. Crepidula fornicata and Aphelochaeta marioni in variable salinity infralittoral mixed sediment. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 24/10/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=52&code=1997>