Biodiversity & Conservation

Molgula manhattensis and Polycarpa spp. with erect sponges on tide-swept moderately exposed circalittoral rock

CR.HCR.XFa.Mol


MCR.MolPol

Image Keith Hiscock - Molgula manhattensis dominated seabed, middle channel with associated common starfish Asterias rubens. Image width ca 50 cm.
Image copyright information

Distribution map

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

Chemical Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Synthetic compound contamination Intermediate Moderate Moderate Decline Low
Heavy metal contamination Intermediate Moderate Moderate Minor decline Very low
Hydrocarbon contamination Intermediate High Low Minor decline Low
Radionuclide contamination Insufficient information Not relevant Insufficient information Insufficient Information Not relevant
Changes in nutrient levels Tolerant Not relevant Not sensitive No change Moderate
Increase in salinity Not relevant Not relevant Not relevant Not relevant High
Decrease in salinity High Moderate Moderate Major decline Moderate
Changes in oxygenation High Moderate Moderate Major decline Low

Biological Factors

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

Species used to indicate biotope intolerance

Physical factors

Molgula manhattensis
Key structural
Alcyonium digitatum
Important characterizing
Urticina felina
Important characterizing
Flustra foliacea
Important characterizing
Nemertesia ramosa
Important characterizing
Substratum LossHighHighHighHighHigh
SmotheringLowIntermediateLowTolerantIntermediate
Increase in suspended sedimentLowLowLowTolerant*Intermediate
Decrease in suspended sedimentTolerantTolerant*Tolerant
DesiccationIntermediateNot relevantIntermediateNot relevantHigh
Increase in emergence regimeIntermediateNot relevantIntermediateNot relevantHigh
Decrease in emergence regimeTolerant*Tolerant*Not relevant
Increase in water flow rateLowTolerant*TolerantTolerantIntermediate
Decrease in water flow rateLowIntermediateIntermediateIntermediate
Increase in temperatureTolerantLowIntermediateTolerantInsufficient information
Decrease in temperatureTolerantLowIntermediateTolerant
Increase in turbidityTolerantLowTolerantTolerantTolerant
Decrease in turbidityTolerant*TolerantTolerant*
Increase in wave exposureIntermediateTolerantTolerantIntermediateHigh
Decrease in wave exposureTolerant*IntermediateIntermediateIntermediate
NoiseTolerantTolerantTolerantTolerantTolerant
Visual PresenceTolerantTolerantTolerantTolerantTolerant
Abrasion & physical disturbanceHighIntermediateIntermediateIntermediateIntermediate
DisplacementHighHighLowHighHigh

Chemical factors

Molgula manhattensis
Key structural
Alcyonium digitatum
Important characterizing
Urticina felina
Important characterizing
Flustra foliacea
Important characterizing
Nemertesia ramosa
Important characterizing
Synthetic compound contaminationLowIntermediateIntermediateHighInsufficient information
Heavy metal contaminationInsufficient informationInsufficient informationInsufficient informationLowInsufficient information
Hydrocarbon contaminationInsufficient informationLowLowInsufficient informationInsufficient information
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsInsufficient informationLowInsufficient informationInsufficient informationInsufficient information
Increase in salinityTolerantIntermediateNot relevantNot relevantInsufficient information
Decrease in salinityIntermediateLowHigh
Changes in oxygenationLowHighIntermediateInsufficient informationInsufficient information

Biological factors

Molgula manhattensis
Key structural
Alcyonium digitatum
Important characterizing
Urticina felina
Important characterizing
Flustra foliacea
Important characterizing
Nemertesia ramosa
Important characterizing
Introduction of microbial pathogens/parasitesTolerantInsufficient informationInsufficient informationLowInsufficient information
Introduction of non-native speciesTolerantInsufficient informationInsufficient informationInsufficient informationInsufficient information
Extraction of this speciesNot relevantNot relevantHighNot relevantNot relevant
Extraction of other speciesNot relevantIntermediateTolerantHighTolerant

Species used to indicate biotope recoverability

Physical factors

Molgula manhattensis
Key structural
Alcyonium digitatum
Important characterizing
Urticina felina
Important characterizing
Flustra foliacea
Important characterizing
Nemertesia ramosa
Important characterizing
Substratum LossVery highHighModerateHighModerate
SmotheringVery highHighVery highNot relevantVery high
Increase in suspended sedimentImmediateVery highVery highNot relevantImmediate
Decrease in suspended sedimentNot relevantNot relevantNot relevant
DesiccationVery highNot relevantModerateNot relevantModerate
Increase in emergence regimeVery highNot relevantModerateNot relevantModerate
Decrease in emergence regimeNot relevantNot relevantNot relevant
Increase in water flow rateImmediateNot relevantNot relevantHighHigh
Decrease in water flow rateImmediateHighModerateHigh
Increase in temperatureNot relevantHighHighNot relevantInsufficient information
Decrease in temperatureNot relevantHighHighNot relevant
Increase in turbidityNot relevantVery highNot relevantNot relevantNot relevant
Decrease in turbidityNot relevantNot relevantNot relevant
Increase in wave exposureVery highNot relevantNot relevantHighModerate
Decrease in wave exposureNot relevantHighHighHigh
NoiseNot relevantNot relevantNot relevantNot relevantNot relevant
Visual PresenceNot relevantNot relevantNot relevantNot relevantNot relevant
Abrasion & physical disturbanceVery highHighModerateHighHigh
DisplacementVery highHighImmediateHighModerate

Chemical factors

Molgula manhattensis
Key structural
Alcyonium digitatum
Important characterizing
Urticina felina
Important characterizing
Flustra foliacea
Important characterizing
Nemertesia ramosa
Important characterizing
Synthetic compound contaminationImmediateHighModerateHighInsufficient information
Heavy metal contaminationNot relevantInsufficient informationInsufficient informationVery highInsufficient information
Hydrocarbon contaminationNot relevantHighVery highNot relevantInsufficient information
Radionuclide contaminationNot relevantInsufficient informationInsufficient informationNot relevantInsufficient information
Changes in nutrient levelsNot relevantHighInsufficient informationNot relevantInsufficient information
Increase in salinityNot relevantHighNot relevantNot relevantInsufficient information
Decrease in salinityVery highVery highHigh
Changes in oxygenationImmediateHighHighNot relevantInsufficient information

Biological factors

Molgula manhattensis
Key structural
Alcyonium digitatum
Important characterizing
Urticina felina
Important characterizing
Flustra foliacea
Important characterizing
Nemertesia ramosa
Important characterizing
Introduction of microbial pathogens/parasitesNot relevantInsufficient informationInsufficient informationImmediateInsufficient information
Introduction of non-native speciesNot relevantInsufficient informationInsufficient informationNot relevantInsufficient information
Extraction of this speciesNot relevantNot relevantModerateNot relevantNot relevant
Extraction of other speciesNot relevantHighNot relevantHighNot relevant

This review can be cited as follows:

Hiscock, K. 2002. Molgula manhattensis and Polycarpa spp. with erect sponges on tide-swept 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 31/10/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=305&code=2004>