Biodiversity & Conservation

Mytilus edulis beds with hydroids and ascidians on tide-swept moderately exposed circalittoral rock

CR.MCR.M.MytHAs


MCR.MytHAs

Image Anon. - Mytilus edulis beds with hydroids and ascidians on tide-swept moderately exposed circalittoral rock. Image width ca 1m in foreground.
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Distribution map

CR.MCR.M.MytHAs 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 High
Smothering Intermediate High Low Minor decline Moderate
Increase in suspended sediment Low Immediate Not sensitive No change Moderate
Decrease in suspended sediment Low Immediate Not sensitive No change Low
Desiccation Not relevant Not relevant Not relevant Not relevant High
Increase in emergence regime Not relevant Not relevant Not relevant Not relevant High
Decrease in emergence regime Not relevant Not relevant Not relevant Not relevant High
Increase in water flow rate Low Immediate Not sensitive No change Low
Decrease in water flow rate Intermediate High Low Minor decline Very low
Increase in temperature Low Very high Very low No change Low
Decrease in temperature Low Very high Very low No change Low
Increase in turbidity Tolerant Not relevant Not sensitive No change Moderate
Decrease in turbidity Tolerant Not relevant Not sensitive No change Moderate
Increase in wave exposure Intermediate High Low Minor decline Low
Decrease in wave exposure Intermediate High Low Minor decline Very 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 Minor decline Low
Displacement Intermediate High Low Decline Low

Chemical Factors

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

Species used to indicate biotope intolerance

Physical factors

Mytilus edulis
Key structural
Asterias rubens
Important functional
Balanus crenatus
Important other
Alcyonium digitatum
Important other
Urticina felina
Important other
Substratum LossHighHighHighHighHigh
SmotheringIntermediateLowHighIntermediateLow
Increase in suspended sedimentLowLowLowLowLow
Decrease in suspended sedimentLowTolerant*
DesiccationLowHighHighNot relevantIntermediate
Increase in emergence regimeLowTolerantHighNot relevantIntermediate
Decrease in emergence regimeLowTolerant*
Increase in water flow rateLowIntermediateLowTolerant*Tolerant
Decrease in water flow rateLowIntermediateIntermediate
Increase in temperatureLowHighHighLowIntermediate
Decrease in temperatureLowLowLowIntermediate
Increase in turbidityTolerantLowLowLowTolerant
Decrease in turbidityTolerantTolerant
Increase in wave exposureIntermediateIntermediateLowTolerantTolerant
Decrease in wave exposureIntermediateLowIntermediateIntermediate
NoiseTolerant*TolerantTolerantTolerantTolerant
Visual PresenceTolerant*TolerantTolerantTolerantTolerant
Abrasion & physical disturbanceIntermediateIntermediateIntermediateIntermediateIntermediate
DisplacementIntermediateLowHighHighLow

Chemical factors

Mytilus edulis
Key structural
Asterias rubens
Important functional
Balanus crenatus
Important other
Alcyonium digitatum
Important other
Urticina felina
Important other
Synthetic compound contaminationIntermediateIntermediateHighIntermediateIntermediate
Heavy metal contaminationIntermediateIntermediateIntermediateInsufficient informationInsufficient information
Hydrocarbon contaminationIntermediateHighLowLowLow
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsIntermediateLowIntermediateLowInsufficient information
Increase in salinityLowHighLowIntermediateNot relevant
Decrease in salinityLowLow
Changes in oxygenationLowHighHighHighIntermediate

Biological factors

Mytilus edulis
Key structural
Asterias rubens
Important functional
Balanus crenatus
Important other
Alcyonium digitatum
Important other
Urticina felina
Important other
Introduction of microbial pathogens/parasitesIntermediateIntermediateInsufficient informationInsufficient informationInsufficient information
Introduction of non-native speciesInsufficient informationInsufficient informationInsufficient informationInsufficient informationInsufficient information
Extraction of this speciesIntermediateNot relevantNot relevantNot relevantHigh
Extraction of other speciesLowLowNot relevantIntermediateTolerant

Species used to indicate biotope recoverability

Physical factors

Mytilus edulis
Key structural
Asterias rubens
Important functional
Balanus crenatus
Important other
Alcyonium digitatum
Important other
Urticina felina
Important other
Substratum LossHighHighHighHighModerate
SmotheringHighVery highHighHighVery high
Increase in suspended sedimentImmediateHighHighVery highVery high
Decrease in suspended sedimentImmediateNot relevant
DesiccationImmediateHighHighNot relevantModerate
Increase in emergence regimeVery highNot relevantHighNot relevantModerate
Decrease in emergence regimeVery highNot relevant
Increase in water flow rateVery highHighVery highNot relevantNot relevant
Decrease in water flow rateVery highHighModerate
Increase in temperatureVery highHighHighHighHigh
Decrease in temperatureVery highHighHighHigh
Increase in turbidityNot relevantVery highVery highVery highNot relevant
Decrease in turbidityNot relevantNot relevant
Increase in wave exposureHighHighVery highNot relevantNot relevant
Decrease in wave exposureHighHighHighHigh
NoiseNot relevantNot relevantNot relevantNot relevantNot relevant
Visual PresenceNot relevantNot relevantNot relevantNot relevantNot relevant
Abrasion & physical disturbanceHighHighHighHighModerate
DisplacementHighImmediateHighHighImmediate

Chemical factors

Mytilus edulis
Key structural
Asterias rubens
Important functional
Balanus crenatus
Important other
Alcyonium digitatum
Important other
Urticina felina
Important other
Synthetic compound contaminationHighHighHighHighModerate
Heavy metal contaminationHighHighHighInsufficient informationInsufficient information
Hydrocarbon contaminationHighHighHighHighVery high
Radionuclide contaminationNot relevantInsufficient informationNot relevantInsufficient informationInsufficient information
Changes in nutrient levelsHighHighHighHighInsufficient information
Increase in salinityVery highHighVery highHighNot relevant
Decrease in salinityVery highVery high
Changes in oxygenationVery highHighHighHighHigh

Biological factors

Mytilus edulis
Key structural
Asterias rubens
Important functional
Balanus crenatus
Important other
Alcyonium digitatum
Important other
Urticina felina
Important other
Introduction of microbial pathogens/parasitesHighHighNot relevantInsufficient informationInsufficient information
Introduction of non-native speciesNot relevantInsufficient informationNot relevantInsufficient informationInsufficient information
Extraction of this speciesHighNot relevantNot relevantNot relevantModerate
Extraction of other speciesVery highHighNot relevantHighNot relevant

This review can be cited as follows:

Tyler-Walters, H. 2001. Mytilus edulis beds with hydroids and ascidians 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 21/10/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=208&code=1997>