Biodiversity & Conservation

Ascophyllum nodosum ecad mackaii beds on extremely sheltered mid eulittoral mixed substrata

LR.LLR.FVS.Ascmac


SLR.AscX.mac

Image Sue Scott - A dense mat of Ascophyllum nodosum mackaii. Image width ca 40 cm.
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Distribution map

LR.LLR.FVS.Ascmac 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 Low High Major decline Moderate
Smothering High Low High Major decline Moderate
Increase in suspended sediment Low Immediate Not sensitive No change High
Decrease in suspended sediment Low Immediate Not sensitive No change High
Desiccation Intermediate Moderate Moderate Minor decline Moderate
Increase in emergence regime Intermediate Moderate Moderate No change Moderate
Decrease in emergence regime Low High Low No change Moderate
Increase in water flow rate High Low High Decline Moderate
Decrease in water flow rate Not relevant Not relevant Not relevant No change Moderate
Increase in temperature Low Very high Very low Minor decline Moderate
Decrease in temperature Low Very high Very low Minor decline High
Increase in turbidity Low Immediate Not sensitive No change High
Decrease in turbidity Tolerant* Very high Not sensitive* No change High
Increase in wave exposure High Low High Decline Moderate
Decrease in wave exposure Not relevant Not relevant Not relevant Not relevant High
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 Minor decline High
Displacement Tolerant Not relevant Not sensitive Not relevant High

Chemical Factors

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

Species used to indicate biotope intolerance

Physical factors

Ascophyllum nodosum
Key structural
Littorina littorea
Important characterizing
Substratum LossHighHigh
SmotheringHighHigh
Increase in suspended sedimentLowIntermediate
Decrease in suspended sediment
DesiccationIntermediateLow
Increase in emergence regimeHighLow
Decrease in emergence regime
Increase in water flow rateIntermediateIntermediate
Decrease in water flow rate
Increase in temperatureLowLow
Decrease in temperature
Increase in turbidityLowLow
Decrease in turbidity
Increase in wave exposureHighIntermediate
Decrease in wave exposure
NoiseTolerantTolerant
Visual PresenceTolerantTolerant
Abrasion & physical disturbanceHighIntermediate
DisplacementHighTolerant

Chemical factors

Ascophyllum nodosum
Key structural
Littorina littorea
Important characterizing
Synthetic compound contaminationIntermediateLow
Heavy metal contaminationLowIntermediate
Hydrocarbon contaminationLowHigh
Radionuclide contaminationInsufficient informationInsufficient information
Changes in nutrient levelsIntermediateTolerant
Increase in salinityLowTolerant
Decrease in salinity
Changes in oxygenationInsufficient informationLow

Biological factors

Ascophyllum nodosum
Key structural
Littorina littorea
Important characterizing
Introduction of microbial pathogens/parasitesInsufficient informationInsufficient information
Introduction of non-native speciesInsufficient informationInsufficient information
Extraction of this speciesIntermediateIntermediate
Extraction of other speciesTolerantTolerant

Species used to indicate biotope recoverability

Physical factors

Ascophyllum nodosum
Key structural
Littorina littorea
Important characterizing
Substratum LossLowHigh
SmotheringLowHigh
Increase in suspended sedimentImmediateHigh
Decrease in suspended sediment
DesiccationModerateImmediate
Increase in emergence regimeLowImmediate
Decrease in emergence regime
Increase in water flow rateLowHigh
Decrease in water flow rate
Increase in temperatureModerateImmediate
Decrease in temperature
Increase in turbidityImmediateVery high
Decrease in turbidity
Increase in wave exposureLowHigh
Decrease in wave exposure
NoiseNot relevantNot relevant
Visual PresenceNot relevantNot relevant
Abrasion & physical disturbanceLowHigh
DisplacementLowNot relevant

Chemical factors

Ascophyllum nodosum
Key structural
Littorina littorea
Important characterizing
Synthetic compound contaminationLowVery high
Heavy metal contaminationHighHigh
Hydrocarbon contaminationModerateHigh
Radionuclide contaminationInsufficient informationInsufficient information
Changes in nutrient levelsHighNot relevant
Increase in salinityHighNot relevant
Decrease in salinity
Changes in oxygenationInsufficient informationVery high

Biological factors

Ascophyllum nodosum
Key structural
Littorina littorea
Important characterizing
Introduction of microbial pathogens/parasitesNot relevantInsufficient information
Introduction of non-native speciesNot relevantInsufficient information
Extraction of this speciesLowHigh
Extraction of other speciesNot relevantNot relevant

This review can be cited as follows:

Hill, J.M. 2001. Ascophyllum nodosum ecad mackaii beds on extremely sheltered mid eulittoral mixed substrata. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 18/04/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=138&code=2004>