Biodiversity & Conservation

Halidrys siliquosa and mixed kelps on tide-swept infralittoral rock with coarse sediment.

IR.MIR.SedK.HalXK


MIR.HalXK

Image Rohan Holt - Halidrys on flat pebbles and gravel. Image width ca 1 m.
Image copyright information

Distribution map

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

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 Low Very high Very low No change Very low
Hydrocarbon contamination Intermediate High Low Decline Moderate
Radionuclide contamination Insufficient information Insufficient information Insufficient information Insufficient Information Not relevant
Changes in nutrient levels Intermediate High Low Decline Moderate
Increase in salinity Not relevant Not relevant Not relevant Not relevant Not relevant
Decrease in salinity Low Very high Very low Decline Moderate
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 Very low
Introduction of non-native species Intermediate High Low Decline Moderate
Extraction of this species Intermediate High Low Decline Low
Extraction of other species High High Moderate Decline Low

Species used to indicate biotope intolerance

Physical factors

Halidrys siliquosa
Important characterizing
Delesseria sanguinea
Important structural
Chondrus crispus
Important structural
Furcellaria lumbricalis
Important structural
Saccharina latissima
Important structural
Botryllus schlosseri
Important structural
Substratum LossHighHighHighHighHighHigh
SmotheringIntermediateIntermediateIntermediateIntermediateHighHigh
Increase in suspended sedimentLowLowIntermediateIntermediateLowHigh
Decrease in suspended sedimentTolerantTolerantTolerant
DesiccationIntermediateHighIntermediateHighHighIntermediate
Increase in emergence regimeIntermediateIntermediateIntermediateIntermediateIntermediateIntermediate
Decrease in emergence regimeTolerant*TolerantTolerant
Increase in water flow rateHighIntermediateIntermediateIntermediateLowIntermediate
Decrease in water flow rateLowIntermediateTolerant
Increase in temperatureTolerantLowLowLowIntermediateLow
Decrease in temperatureTolerantLowTolerant
Increase in turbidityIntermediateTolerantLowTolerantLowLow
Decrease in turbidityTolerant*Tolerant*Tolerant
Increase in wave exposureHighTolerantIntermediateIntermediateHighIntermediate
Decrease in wave exposureTolerant*LowTolerant
NoiseTolerantTolerantTolerantTolerantTolerantTolerant
Visual PresenceTolerantTolerantTolerantTolerantTolerantTolerant
Abrasion & physical disturbanceIntermediateIntermediateLowIntermediateIntermediateIntermediate
DisplacementHighHighHighLowIntermediateHigh

Chemical factors

Halidrys siliquosa
Important characterizing
Delesseria sanguinea
Important structural
Chondrus crispus
Important structural
Furcellaria lumbricalis
Important structural
Saccharina latissima
Important structural
Botryllus schlosseri
Important structural
Synthetic compound contaminationIntermediateHighHighHighLowInsufficient information
Heavy metal contaminationLowLowInsufficient informationInsufficient informationIntermediateInsufficient information
Hydrocarbon contaminationLowHighLowHighLowInsufficient information
Radionuclide contaminationInsufficient informationInsufficient informationInsufficient informationInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsTolerant*LowIntermediateIntermediateIntermediateLow
Increase in salinityLowLowTolerantLowHighIntermediate
Decrease in salinityLowLowTolerant
Changes in oxygenationInsufficient informationHighInsufficient informationInsufficient informationInsufficient informationIntermediate

Biological factors

Halidrys siliquosa
Important characterizing
Delesseria sanguinea
Important structural
Chondrus crispus
Important structural
Furcellaria lumbricalis
Important structural
Saccharina latissima
Important structural
Botryllus schlosseri
Important structural
Introduction of microbial pathogens/parasitesInsufficient informationInsufficient informationIntermediateInsufficient informationIntermediateInsufficient information
Introduction of non-native speciesHighNot relevantInsufficient informationInsufficient informationInsufficient informationTolerant*
Extraction of this speciesNot relevantNot relevantIntermediateHighIntermediateNot relevant
Extraction of other speciesTolerant*Tolerant*Insufficient informationIntermediateInsufficient informationHigh

Species used to indicate biotope recoverability

Physical factors

Halidrys siliquosa
Important characterizing
Delesseria sanguinea
Important structural
Chondrus crispus
Important structural
Furcellaria lumbricalis
Important structural
Saccharina latissima
Important structural
Botryllus schlosseri
Important structural
Substratum LossHighHighHighModerateHighHigh
SmotheringHighHighHighModerateHighHigh
Increase in suspended sedimentVery highImmediateHighModerateHighHigh
Decrease in suspended sedimentNot relevantNot relevantNot relevant
DesiccationHighHighHighModerateHighHigh
Increase in emergence regimeHighHighHighModerateHighHigh
Decrease in emergence regimeNot relevantNot relevantNot relevant
Increase in water flow rateHighHighHighModerateHighHigh
Decrease in water flow rateImmediateHighNot relevant
Increase in temperatureNot relevantImmediateVery highVery highHighVery high
Decrease in temperatureNot relevantVery highNot relevant
Increase in turbidityHighNot relevantVery highNot relevantHighImmediate
Decrease in turbidityNot relevantNot relevantNot relevant
Increase in wave exposureHighNot relevantHighModerateHighModerate
Decrease in wave exposureNot relevantVery highNot relevant
NoiseNot relevantNot relevantNot relevantNot relevantNot relevantNot relevant
Visual PresenceNot relevantNot relevantNot relevantNot relevantNot relevantNot relevant
Abrasion & physical disturbanceHighHighVery highModerateVery highHigh
DisplacementHighHighHighVery highHighModerate

Chemical factors

Halidrys siliquosa
Important characterizing
Delesseria sanguinea
Important structural
Chondrus crispus
Important structural
Furcellaria lumbricalis
Important structural
Saccharina latissima
Important structural
Botryllus schlosseri
Important structural
Synthetic compound contaminationHighHighHighModerateHighNot relevant
Heavy metal contaminationVery highVery highInsufficient informationNot relevantHighNot relevant
Hydrocarbon contaminationVery highHighVery highModerateHighNot relevant
Radionuclide contaminationNot relevantNot relevantInsufficient informationNot relevantNot relevantNot relevant
Changes in nutrient levelsNot relevantImmediateHighModerateHighHigh
Increase in salinityVery highImmediateNot relevantVery highHighHigh
Decrease in salinityVery highVery highNot relevant
Changes in oxygenationNot relevantHighInsufficient informationNot relevantNot relevantHigh

Biological factors

Halidrys siliquosa
Important characterizing
Delesseria sanguinea
Important structural
Chondrus crispus
Important structural
Furcellaria lumbricalis
Important structural
Saccharina latissima
Important structural
Botryllus schlosseri
Important structural
Introduction of microbial pathogens/parasitesNot relevantInsufficient informationHighNot relevantHighHigh
Introduction of non-native speciesHighNot relevantInsufficient informationNot relevantNot relevantNot relevant
Extraction of this speciesNot relevantNot relevantHighModerateHighNot relevant
Extraction of other speciesNot relevantNot relevantInsufficient informationModerateNot relevantModerate

This review can be cited as follows:

Tyler-Walters, H. 2002. Halidrys siliquosa and mixed kelps on tide-swept infralittoral rock with coarse sediment.. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 29/07/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=258&code=1997>