Biodiversity & Conservation

Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock

IR.MIR.SedK.PolAhn


<i>%Polyides rotundus%</i>, <i>%Ahnfeltia plicata%</i> and <i>%Chondrus crispus%</i> on sand-covered infralittoral rock
Distribution map

IR.MIR.SedK.PolAhn 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 High
Smothering Intermediate High Low Minor decline Low
Increase in suspended sediment Intermediate High Low Minor decline Low
Decrease in suspended sediment Tolerant Not relevant Not sensitive No change High
Desiccation High High Moderate Decline High
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 Intermediate High Low No change Low
Decrease in water flow rate Intermediate High Low No change Low
Increase in temperature Low Very high Very low No change High
Decrease in temperature Low Very high Very low No change High
Increase in turbidity Low Very high Very low Minor decline Moderate
Decrease in turbidity Tolerant Not relevant Not sensitive No change High
Increase in wave exposure Intermediate High Low Minor decline High
Decrease in wave exposure Intermediate Very high Low No change Low
Noise Tolerant Not relevant Not sensitive No change High
Visual Presence Tolerant Not relevant Not sensitive No change High
Abrasion & physical disturbance Intermediate High Low No change 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 High Moderate Moderate Major decline Low
Heavy metal contamination Insufficient information Insufficient information Insufficient information Insufficient Information Not relevant
Hydrocarbon contamination High High Moderate Major decline Very low
Radionuclide contamination Insufficient information Insufficient information Insufficient information Insufficient Information Not relevant
Changes in nutrient levels Intermediate High Low No change Moderate
Increase in salinity Not relevant Not relevant Not relevant Not relevant Not relevant
Decrease in salinity Low Very high Very low Minor decline High
Changes in oxygenation Low Very high Very low No change Very low

Biological Factors

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

Species used to indicate biotope intolerance

Physical factors

Ahnfeltia plicata
Important characterizing
Chondrus crispus
Important characterizing
Furcellaria lumbricalis
Important characterizing
Urticina felina
Important other
Substratum LossHighHighHighHigh
SmotheringIntermediateIntermediateIntermediateLow
Increase in suspended sedimentIntermediateIntermediateIntermediateLow
Decrease in suspended sedimentTolerantTolerantTolerantTolerant*
DesiccationLowIntermediateHighIntermediate
Increase in emergence regimeIntermediateIntermediateIntermediateIntermediate
Decrease in emergence regimeTolerantTolerantTolerantTolerant*
Increase in water flow rateIntermediateIntermediateIntermediateTolerant
Decrease in water flow rateIntermediateIntermediateTolerantIntermediate
Increase in temperatureLowLowLowIntermediate
Decrease in temperatureLowLowTolerantIntermediate
Increase in turbidityIntermediateLowTolerantTolerant
Decrease in turbidityTolerant*Tolerant*TolerantTolerant
Increase in wave exposureIntermediateIntermediateIntermediateTolerant
Decrease in wave exposureLowLowTolerantIntermediate
NoiseTolerantTolerantTolerantTolerant
Visual PresenceTolerantTolerantTolerantTolerant
Abrasion & physical disturbanceIntermediateLowIntermediateIntermediate
DisplacementHighHighLowLow

Chemical factors

Ahnfeltia plicata
Important characterizing
Chondrus crispus
Important characterizing
Furcellaria lumbricalis
Important characterizing
Urticina felina
Important other
Synthetic compound contaminationHighHighHighIntermediate
Heavy metal contaminationInsufficient informationInsufficient informationInsufficient informationInsufficient information
Hydrocarbon contaminationHighLowHighLow
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsIntermediateIntermediateIntermediateInsufficient information
Increase in salinityNot relevantTolerantLowNot relevant
Decrease in salinityLowLowTolerantLow
Changes in oxygenationInsufficient informationInsufficient informationInsufficient informationIntermediate

Biological factors

Ahnfeltia plicata
Important characterizing
Chondrus crispus
Important characterizing
Furcellaria lumbricalis
Important characterizing
Urticina felina
Important other
Introduction of microbial pathogens/parasitesInsufficient informationIntermediateInsufficient informationInsufficient information
Introduction of non-native speciesInsufficient informationInsufficient informationInsufficient informationInsufficient information
Extraction of this speciesNot relevantIntermediateHighHigh
Extraction of other speciesInsufficient informationInsufficient informationIntermediateTolerant

Species used to indicate biotope recoverability

Physical factors

Ahnfeltia plicata
Important characterizing
Chondrus crispus
Important characterizing
Furcellaria lumbricalis
Important characterizing
Urticina felina
Important other
Substratum LossHighHighModerateModerate
SmotheringHighHighModerateVery high
Increase in suspended sedimentHighHighModerateVery high
Decrease in suspended sedimentNot relevantNot relevantNot relevantNot relevant
DesiccationImmediateHighModerateModerate
Increase in emergence regimeHighHighModerateModerate
Decrease in emergence regimeNot relevantNot relevantNot relevantNot relevant
Increase in water flow rateHighHighModerateNot relevant
Decrease in water flow rateHighHighNot relevantModerate
Increase in temperatureVery highVery highVery highHigh
Decrease in temperatureVery highVery highNot relevantHigh
Increase in turbidityHighVery highNot relevantNot relevant
Decrease in turbidityNot relevantNot relevantNot relevantNot relevant
Increase in wave exposureHighHighModerateNot relevant
Decrease in wave exposureVery highVery highNot relevantHigh
NoiseNot relevantNot relevantNot relevantNot relevant
Visual PresenceNot relevantNot relevantNot relevantNot relevant
Abrasion & physical disturbanceHighVery highModerateModerate
DisplacementHighHighVery highImmediate

Chemical factors

Ahnfeltia plicata
Important characterizing
Chondrus crispus
Important characterizing
Furcellaria lumbricalis
Important characterizing
Urticina felina
Important other
Synthetic compound contaminationHighHighModerateModerate
Heavy metal contaminationInsufficient informationInsufficient informationNot relevantInsufficient information
Hydrocarbon contaminationHighVery highModerateVery high
Radionuclide contaminationInsufficient informationInsufficient informationNot relevantInsufficient information
Changes in nutrient levelsHighHighModerateInsufficient information
Increase in salinityNot relevantNot relevantVery highNot relevant
Decrease in salinityVery highVery highNot relevantVery high
Changes in oxygenationInsufficient informationInsufficient informationNot relevantHigh

Biological factors

Ahnfeltia plicata
Important characterizing
Chondrus crispus
Important characterizing
Furcellaria lumbricalis
Important characterizing
Urticina felina
Important other
Introduction of microbial pathogens/parasitesInsufficient informationHighNot relevantInsufficient information
Introduction of non-native speciesInsufficient informationInsufficient informationNot relevantInsufficient information
Extraction of this speciesNot relevantHighModerateModerate
Extraction of other speciesInsufficient informationInsufficient informationModerateNot relevant

This review can be cited as follows:

Rayment, W.J. 2002. Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 26/10/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=222&code=1997>