Biodiversity & Conservation

Alaria esculenta on exposed sublittoral fringe bedrock

IR.EIR.KFaR.Ala


EIR.Ala

Image Roger Mitchell - Exposed sublittoral fringe bedrock with Alaria esculenta, Isles of Scilly. Image width ca 1 m.
Image copyright information

Distribution map

IR.EIR.KFaR.Ala 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 Decline Moderate
Increase in suspended sediment Intermediate High Low Decline Moderate
Decrease in suspended sediment
Desiccation High High Moderate Major decline Moderate
Increase in emergence regime Intermediate High Low Minor decline Low
Decrease in emergence regime
Increase in water flow rate Intermediate High Low Minor decline Low
Decrease in water flow rate
Increase in temperature High High Moderate Decline Moderate
Decrease in temperature
Increase in turbidity Low High Low No change Low
Decrease in turbidity
Increase in wave exposure High High Moderate Minor decline Moderate
Decrease in wave exposure
Noise Tolerant Not relevant Not sensitive Not relevant High
Visual Presence Tolerant Not relevant Not sensitive Not relevant High
Abrasion & physical disturbance Low High Low Decline Low
Displacement High High Moderate Major decline Moderate

Chemical Factors

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

Biological Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Introduction of microbial pathogens/parasites Low Very high Very low Moderate
Introduction of non-native species Low Immediate Not sensitive No change Low
Extraction of this species Intermediate High Low Decline Low
Extraction of other species Not relevant Not relevant Not relevant Not relevant Not relevant

Species used to indicate biotope intolerance

Physical factors

Alaria esculenta
Key structural
Corallina officinalis
Important characterizing
Substratum LossHighHigh
SmotheringIntermediateIntermediate
Increase in suspended sedimentIntermediateIntermediate
Decrease in suspended sediment
DesiccationHighHigh
Increase in emergence regimeIntermediateIntermediate
Decrease in emergence regime
Increase in water flow rateIntermediateLow
Decrease in water flow rate
Increase in temperatureHighIntermediate
Decrease in temperature
Increase in turbidityLowLow
Decrease in turbidity
Increase in wave exposureHighLow
Decrease in wave exposure
NoiseTolerantTolerant
Visual PresenceTolerantTolerant
Abrasion & physical disturbanceIntermediateLow
DisplacementHighLow

Chemical factors

Alaria esculenta
Key structural
Corallina officinalis
Important characterizing
Synthetic compound contaminationIntermediateIntermediate
Heavy metal contaminationIntermediateInsufficient information
Hydrocarbon contaminationLowLow
Radionuclide contaminationInsufficient informationInsufficient information
Changes in nutrient levelsIntermediateLow
Increase in salinityHighIntermediate
Decrease in salinity
Changes in oxygenationInsufficient informationInsufficient information

Biological factors

Alaria esculenta
Key structural
Corallina officinalis
Important characterizing
Introduction of microbial pathogens/parasitesLowLow
Introduction of non-native speciesLowNot relevant
Extraction of this speciesIntermediateIntermediate
Extraction of other speciesIntermediateIntermediate

Species used to indicate biotope recoverability

Physical factors

Alaria esculenta
Key structural
Corallina officinalis
Important characterizing
Substratum LossHighHigh
SmotheringHighVery high
Increase in suspended sedimentHighVery high
Decrease in suspended sediment
DesiccationHighHigh
Increase in emergence regimeHighVery high
Decrease in emergence regime
Increase in water flow rateHighVery high
Decrease in water flow rate
Increase in temperatureHighHigh
Decrease in temperature
Increase in turbidityHighImmediate
Decrease in turbidity
Increase in wave exposureHighVery high
Decrease in wave exposure
NoiseNot relevantNot relevant
Visual PresenceNot relevantNot relevant
Abrasion & physical disturbanceHighHigh
DisplacementHighHigh

Chemical factors

Alaria esculenta
Key structural
Corallina officinalis
Important characterizing
Synthetic compound contaminationHighHigh
Heavy metal contaminationHighInsufficient information
Hydrocarbon contaminationImmediateVery high
Radionuclide contaminationInsufficient informationInsufficient information
Changes in nutrient levelsHighVery high
Increase in salinityHighHigh
Decrease in salinity
Changes in oxygenationNot relevantInsufficient information

Biological factors

Alaria esculenta
Key structural
Corallina officinalis
Important characterizing
Introduction of microbial pathogens/parasitesImmediateVery high
Introduction of non-native speciesImmediateNot relevant
Extraction of this speciesHighHigh
Extraction of other speciesModerateHigh

This review can be cited as follows:

Tyler-Walters, H. 2000. Alaria esculenta on exposed sublittoral fringe bedrock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 26/07/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=165&code=1997>