Biodiversity & Conservation

Underboulder communities

LR.MLR.BF.Fser.Fser.Bo


MLR.Fser.Fser.Bo

Image Keith Hiscock - Underboulder community dominated by sponges from a rock pool habitat. Wembury, South Devon. Image width ca 1 m.
Image copyright information

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Distribution map

LR.MLR.BF.Fser.Fser.Bo recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)


  • EC_Habitats
  • UK_BAP

Habitat sensitivity

Physical Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Substratum Loss High High Moderate Major decline Low
Smothering High High Moderate Decline Low
Increase in suspended sediment Intermediate High Low Minor decline Low
Decrease in suspended sediment Tolerant* Not relevant Not sensitive* No change Low
Desiccation High High Moderate Major decline Low
Increase in emergence regime Intermediate High Low Decline Low
Decrease in emergence regime Tolerant Not relevant Not sensitive No change Very low
Increase in water flow rate Tolerant* Not relevant Not sensitive* No change Low
Decrease in water flow rate Intermediate High Low Decline Low
Increase in temperature Low High Low Minor decline Low
Decrease in temperature Low High Low Minor decline 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 Decline Low
Decrease in wave exposure Intermediate High Low Decline Low
Noise Tolerant Not relevant Not sensitive Not relevant Moderate
Visual Presence Tolerant Not relevant Not sensitive Not relevant Moderate
Abrasion & physical disturbance High High Moderate Decline Moderate
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 Low
Heavy metal contamination Insufficient information Not relevant Insufficient information Insufficient Information Not relevant
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 Tolerant Not relevant Not sensitive No change Low
Decrease in salinity Intermediate High Low Decline Low
Changes in oxygenation Intermediate High Low Minor decline Very 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 Insufficient information Not relevant Insufficient information Not relevant Not relevant
Extraction of this species Low High Low Minor decline Low
Extraction of other species Low High Low Minor decline Low

Species used to indicate biotope intolerance

Physical factors

Pisidia longicornis
Important other
Umbonula littoralis
Important other
Botryllus schlosseri
Important structural
Balanus crenatus
Important other
Substratum LossIntermediateHighHighHigh
SmotheringLowIntermediateHighHigh
Increase in suspended sedimentTolerantIntermediateHighLow
Decrease in suspended sedimentTolerant
DesiccationHighIntermediateIntermediateHigh
Increase in emergence regimeLowIntermediateIntermediateHigh
Decrease in emergence regimeTolerant*
Increase in water flow rateLowIntermediateIntermediateLow
Decrease in water flow rateIntermediate
Increase in temperatureTolerantLowLowHigh
Decrease in temperatureIntermediate
Increase in turbidityLowLowLowLow
Decrease in turbidityTolerant
Increase in wave exposureIntermediateIntermediateIntermediateLow
Decrease in wave exposureIntermediate
NoiseTolerantTolerantTolerantTolerant
Visual PresenceLowTolerantTolerantTolerant
Abrasion & physical disturbanceHighIntermediateIntermediateIntermediate
DisplacementLowHighHighHigh

Chemical factors

Pisidia longicornis
Important other
Umbonula littoralis
Important other
Botryllus schlosseri
Important structural
Balanus crenatus
Important other
Synthetic compound contaminationIntermediateInsufficient informationInsufficient informationHigh
Heavy metal contaminationIntermediateInsufficient informationInsufficient informationIntermediate
Hydrocarbon contaminationIntermediateIntermediateInsufficient informationLow
Radionuclide contaminationTolerantInsufficient informationInsufficient informationInsufficient information
Changes in nutrient levelsTolerantInsufficient informationLowIntermediate
Increase in salinityIntermediateHighIntermediateLow
Decrease in salinityHigh
Changes in oxygenationIntermediateLowIntermediateHigh

Biological factors

Pisidia longicornis
Important other
Umbonula littoralis
Important other
Botryllus schlosseri
Important structural
Balanus crenatus
Important other
Introduction of microbial pathogens/parasitesInsufficient informationInsufficient informationInsufficient informationInsufficient information
Introduction of non-native speciesInsufficient informationInsufficient informationTolerant*Insufficient information
Extraction of this speciesHighNot relevantNot relevantNot relevant
Extraction of other speciesInsufficient informationHighHighNot relevant

Species used to indicate biotope recoverability

Physical factors

Pisidia longicornis
Important other
Umbonula littoralis
Important other
Botryllus schlosseri
Important structural
Balanus crenatus
Important other
Substratum LossHighHighHighHigh
SmotheringHighHighHighHigh
Increase in suspended sedimentNot relevantHighHighHigh
Decrease in suspended sedimentNot relevant
DesiccationHighHighHighHigh
Increase in emergence regimeVery highHighHighHigh
Decrease in emergence regimeNot relevant
Increase in water flow rateHighHighHighVery high
Decrease in water flow rateHigh
Increase in temperatureNot relevantHighVery highHigh
Decrease in temperatureHigh
Increase in turbidityHighHighImmediateVery high
Decrease in turbidityNot relevant
Increase in wave exposureHighHighModerateVery high
Decrease in wave exposureHigh
NoiseNot relevantNot relevantNot relevantNot relevant
Visual PresenceImmediateNot relevantNot relevantNot relevant
Abrasion & physical disturbanceHighHighHighHigh
DisplacementVery highHighModerateHigh

Chemical factors

Pisidia longicornis
Important other
Umbonula littoralis
Important other
Botryllus schlosseri
Important structural
Balanus crenatus
Important other
Synthetic compound contaminationHighNot relevantNot relevantHigh
Heavy metal contaminationHighNot relevantNot relevantHigh
Hydrocarbon contaminationHighHighNot relevantHigh
Radionuclide contaminationNot relevantNot relevantNot relevantNot relevant
Changes in nutrient levelsNot relevantNot relevantHighHigh
Increase in salinityHighHighHighVery high
Decrease in salinityHigh
Changes in oxygenationHighHighHighHigh

Biological factors

Pisidia longicornis
Important other
Umbonula littoralis
Important other
Botryllus schlosseri
Important structural
Balanus crenatus
Important other
Introduction of microbial pathogens/parasitesInsufficient informationNot relevantHighNot relevant
Introduction of non-native speciesNot relevantNot relevantNot relevantNot relevant
Extraction of this speciesHighNot relevantNot relevantNot relevant
Extraction of other speciesNot relevantHighModerateNot relevant

This review can be cited as follows:

Hiscock, K. 2005. Underboulder communities. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 31/08/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=371&code=1997>