Biodiversity & Conservation

Piddocks with a sparse associated fauna in upward-facing circalittoral very soft chalk or clay

CR.MCR.SfR.Pid


MCR.Pid

Image Roger Covey - Piddocks with a sparse associated fauna in upward-facing circalittoral very soft chalk or clay. Image width ca 30 cm.
Image copyright information

Distribution map

CR.MCR.SfR.Pid 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 Decline Low
Increase in suspended sediment Low High Low Minor decline Moderate
Decrease in suspended sediment
Desiccation Intermediate High Low Minor decline Low
Increase in emergence regime Intermediate High Low Minor decline Low
Decrease in emergence regime
Increase in water flow rate Intermediate High Low Decline Low
Decrease in water flow rate
Increase in temperature Low High Low No change Low
Decrease in temperature
Increase in turbidity Low High Low No change Low
Decrease in turbidity
Increase in wave exposure Low High Low Decline Very low
Decrease in wave exposure
Noise Tolerant Not relevant Not sensitive Not relevant Low
Visual Presence Tolerant Not relevant Not sensitive Not relevant Low
Abrasion & physical disturbance Intermediate Very high Low Decline Low
Displacement High High Moderate Decline Low

Chemical Factors

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

Biological Factors

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

Species used to indicate biotope intolerance

Physical factors

Pholas dactylus
Key structural
Polydora ciliata
Key functional
Urticina felina
Important characterizing
Substratum LossHighHighHigh
SmotheringLowTolerantLow
Increase in suspended sedimentLowTolerantLow
Decrease in suspended sedimentTolerant*
DesiccationIntermediateIntermediateIntermediate
Increase in emergence regimeIntermediateIntermediateIntermediate
Decrease in emergence regimeTolerant*
Increase in water flow rateLowIntermediateTolerant
Decrease in water flow rateIntermediate
Increase in temperatureIntermediateLowIntermediate
Decrease in temperatureIntermediate
Increase in turbidityLowTolerantTolerant
Decrease in turbidityTolerant
Increase in wave exposureLowLowTolerant
Decrease in wave exposureIntermediate
NoiseLowTolerantTolerant
Visual PresenceLowLowTolerant
Abrasion & physical disturbanceIntermediateIntermediateIntermediate
DisplacementHighLowLow

Chemical factors

Pholas dactylus
Key structural
Polydora ciliata
Key functional
Urticina felina
Important characterizing
Synthetic compound contaminationHighLowIntermediate
Heavy metal contaminationIntermediateIntermediateInsufficient information
Hydrocarbon contaminationInsufficient informationIntermediateLow
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsInsufficient informationLowInsufficient information
Increase in salinityIntermediateLowNot relevant
Decrease in salinityLow
Changes in oxygenationLowLowIntermediate

Biological factors

Pholas dactylus
Key structural
Polydora ciliata
Key functional
Urticina felina
Important characterizing
Introduction of microbial pathogens/parasitesInsufficient informationInsufficient informationInsufficient information
Introduction of non-native speciesTolerantInsufficient informationInsufficient information
Extraction of this speciesIntermediateLowHigh
Extraction of other speciesTolerantNot relevantTolerant

Species used to indicate biotope recoverability

Physical factors

Pholas dactylus
Key structural
Polydora ciliata
Key functional
Urticina felina
Important characterizing
Substratum LossHighHighModerate
SmotheringHighNot relevantVery high
Increase in suspended sedimentHighNot relevantVery high
Decrease in suspended sedimentNot relevant
DesiccationHighHighModerate
Increase in emergence regimeHighHighModerate
Decrease in emergence regimeNot relevant
Increase in water flow rateVery highHighNot relevant
Decrease in water flow rateModerate
Increase in temperatureHighHighHigh
Decrease in temperatureHigh
Increase in turbidityImmediateNot relevantNot relevant
Decrease in turbidityNot relevant
Increase in wave exposureHighHighNot relevant
Decrease in wave exposureHigh
NoiseImmediateNot relevantNot relevant
Visual PresenceImmediateHighNot relevant
Abrasion & physical disturbanceHighHighModerate
DisplacementHighHighImmediate

Chemical factors

Pholas dactylus
Key structural
Polydora ciliata
Key functional
Urticina felina
Important characterizing
Synthetic compound contaminationHighHighModerate
Heavy metal contaminationHighHighInsufficient information
Hydrocarbon contaminationInsufficient informationHighVery high
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsInsufficient informationHighInsufficient information
Increase in salinityHighHighNot relevant
Decrease in salinityVery high
Changes in oxygenationHighHighHigh

Biological factors

Pholas dactylus
Key structural
Polydora ciliata
Key functional
Urticina felina
Important characterizing
Introduction of microbial pathogens/parasitesNot relevantNot relevantInsufficient information
Introduction of non-native speciesNot relevantInsufficient informationInsufficient information
Extraction of this speciesHighHighModerate
Extraction of other speciesInsufficient informationNot relevantNot relevant

This review can be cited as follows:

Hill, J.M. 2008. Piddocks with a sparse associated fauna in upward-facing circalittoral very soft chalk or clay. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 19/04/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=152&code=1997>