Biodiversity & Conservation

Polydora ciliata, Mya truncata and solitary ascidians in variable salinity infralittoral mixed sediment.

SS.SMx.SMxVS.AphPol


<i>%Polydora ciliata%</i>, <i>%Mya truncata%</i> and solitary ascidians in variable salinity infralittoral mixed sediment.
Distribution map

SS.SMx.SMxVS.AphPol 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 Moderate
Smothering Intermediate High Low Minor decline Low
Increase in suspended sediment Low Very high Very low No change Low
Decrease in suspended sediment Low Very high Very low No change Low
Desiccation Low Very high Very low No change Low
Increase in emergence regime Intermediate High Low Minor decline Low
Decrease in emergence regime Tolerant* Not relevant Not sensitive* Not relevant Not relevant
Increase in water flow rate High High Moderate Major decline Low
Decrease in water flow rate High High Moderate Decline Low
Increase in temperature Tolerant Not relevant Not sensitive Not relevant Low
Decrease in temperature Tolerant Not relevant Not sensitive Not relevant Low
Increase in turbidity Low Very high Very low No change Low
Decrease in turbidity Intermediate Very high Low Rise Low
Increase in wave exposure High High Moderate Major decline Low
Decrease in wave exposure Tolerant Not relevant Not sensitive Not relevant Low
Noise Tolerant Not relevant Not sensitive No change High
Visual Presence Tolerant Not relevant Not sensitive No change Low
Abrasion & physical disturbance Intermediate High Low 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 Intermediate High Low Decline Low
Heavy metal contamination High High Moderate Decline Low
Hydrocarbon contamination Intermediate High Low Major 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 Low Immediate Not sensitive Minor decline Low
Changes in oxygenation Low Immediate Not sensitive Minor decline Moderate

Biological Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Introduction of microbial pathogens/parasites Intermediate High Low Low
Introduction of non-native species High High Moderate Minor decline Low
Extraction of this species Not relevant Not relevant Not relevant Not relevant Not relevant
Extraction of other species Not relevant Not relevant Not relevant Not relevant Not relevant

Species used to indicate biotope intolerance

Physical factors

Polydora ciliata
Important characterizing
Mya arenaria
Important characterizing
Aphelochaeta marioni
Important characterizing
Ascidiella scabra
Important other
Molgula manhattensis
Important other
Substratum LossHighHighHighHighHigh
SmotheringTolerantIntermediateLowLowLow
Increase in suspended sedimentTolerantIntermediateTolerant*LowLow
Decrease in suspended sedimentLowTolerantTolerant
DesiccationIntermediateIntermediateNot relevantIntermediateIntermediate
Increase in emergence regimeIntermediateIntermediateIntermediateIntermediateIntermediate
Decrease in emergence regimeTolerantTolerant*Tolerant*
Increase in water flow rateIntermediateIntermediateIntermediateLowLow
Decrease in water flow rateTolerant*LowLow
Increase in temperatureLowLowLowTolerantTolerant
Decrease in temperatureLowTolerantTolerant
Increase in turbidityTolerantLowLowTolerantTolerant
Decrease in turbidityTolerantTolerant*Tolerant*
Increase in wave exposureLowIntermediateHighIntermediateIntermediate
Decrease in wave exposureTolerantTolerant*Tolerant*
NoiseTolerantTolerantTolerantTolerantTolerant
Visual PresenceLowTolerantLowTolerantTolerant
Abrasion & physical disturbanceIntermediateIntermediateIntermediateHighHigh
DisplacementLowIntermediateTolerantHighHigh

Chemical factors

Polydora ciliata
Important characterizing
Mya arenaria
Important characterizing
Aphelochaeta marioni
Important characterizing
Ascidiella scabra
Important other
Molgula manhattensis
Important other
Synthetic compound contaminationLowIntermediateHighIntermediateLow
Heavy metal contaminationIntermediateIntermediateLowInsufficient informationInsufficient information
Hydrocarbon contaminationIntermediateHighTolerant*Insufficient informationInsufficient information
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsLowIntermediateIntermediateInsufficient informationInsufficient information
Increase in salinityLowLowTolerantTolerantTolerant
Decrease in salinityTolerantIntermediateIntermediate
Changes in oxygenationLowLowLowLowLow

Biological factors

Polydora ciliata
Important characterizing
Mya arenaria
Important characterizing
Aphelochaeta marioni
Important characterizing
Ascidiella scabra
Important other
Molgula manhattensis
Important other
Introduction of microbial pathogens/parasitesInsufficient informationIntermediateLowInsufficient informationTolerant
Introduction of non-native speciesInsufficient informationIntermediateInsufficient informationTolerantTolerant
Extraction of this speciesLowIntermediateNot relevantNot relevantNot relevant
Extraction of other speciesNot relevantHighIntermediateNot relevantNot relevant

Species used to indicate biotope recoverability

Physical factors

Polydora ciliata
Important characterizing
Mya arenaria
Important characterizing
Aphelochaeta marioni
Important characterizing
Ascidiella scabra
Important other
Molgula manhattensis
Important other
Substratum LossHighHighHighVery highVery high
SmotheringNot relevantHighImmediateImmediateVery high
Increase in suspended sedimentNot relevantHighNot relevantImmediateImmediate
Decrease in suspended sedimentImmediateNot relevantNot relevant
DesiccationHighHighNot relevantVery highVery high
Increase in emergence regimeHighHighHighVery highVery high
Decrease in emergence regimeNot relevantNot relevantNot relevant
Increase in water flow rateHighHighHighImmediateImmediate
Decrease in water flow rateNot relevantImmediateImmediate
Increase in temperatureHighVery highVery highNot relevantNot relevant
Decrease in temperatureVery highNot relevantNot relevant
Increase in turbidityNot relevantImmediateVery highNot relevantNot relevant
Decrease in turbidityNot relevantNot relevantNot relevant
Increase in wave exposureHighHighHighVery highVery high
Decrease in wave exposureNot relevantNot relevantNot relevant
NoiseNot relevantNot relevantNot relevantNot relevantNot relevant
Visual PresenceHighNot relevantImmediateNot relevantNot relevant
Abrasion & physical disturbanceHighHighHighVery highVery high
DisplacementHighHighNot relevantVery highVery high

Chemical factors

Polydora ciliata
Important characterizing
Mya arenaria
Important characterizing
Aphelochaeta marioni
Important characterizing
Ascidiella scabra
Important other
Molgula manhattensis
Important other
Synthetic compound contaminationHighHighHighVery highImmediate
Heavy metal contaminationHighHighVery highNot relevantNot relevant
Hydrocarbon contaminationHighModerateNot relevantNot relevantNot relevant
Radionuclide contaminationInsufficient informationNot relevantNot relevantNot relevantNot relevant
Changes in nutrient levelsHighHighHighNot relevantNot relevant
Increase in salinityHighImmediateNot relevantNot relevantNot relevant
Decrease in salinityNot relevantVery highVery high
Changes in oxygenationHighImmediateVery highImmediateImmediate

Biological factors

Polydora ciliata
Important characterizing
Mya arenaria
Important characterizing
Aphelochaeta marioni
Important characterizing
Ascidiella scabra
Important other
Molgula manhattensis
Important other
Introduction of microbial pathogens/parasitesNot relevantHighVery highNot relevantNot relevant
Introduction of non-native speciesInsufficient informationHighNot relevantNot relevantNot relevant
Extraction of this speciesHighHighNot relevantNot relevantNot relevant
Extraction of other speciesNot relevantHighHighNot relevantNot relevant

This review can be cited as follows:

Tyler-Walters, H. 2002. Polydora ciliata, Mya truncata and solitary ascidians 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 20/08/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=114&code=2004>