Biodiversity & Conservation

Sensitivity

Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata

SS.SBR.SMus.ModT

Image Anon. - Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata. Image width ca 50 cm.
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SS.SBR.SMus.ModT recorded () and expected () distribution in Britain and Ireland (see below)

Habitat sensitivity

Physical Factors

Click factor name to view rationale	Intolerance	Recoverability	Sensitivity	Species Richness	Evidence / Confidence
Substratum Loss	High	Very low / none	Very High	Major decline	High
Smothering	Intermediate	Low	High	Decline	Low
Increase in suspended sediment	Low	Very high	Very low	Decline	Low
Decrease in suspended sediment	Low	Immediate	Not sensitive	No change	Moderate
Desiccation	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Increase in emergence regime	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Decrease in emergence regime	Tolerant*	Not relevant	Not sensitive*	No change	Very low
Increase in water flow rate	Intermediate	Low	High	Decline	Moderate
Decrease in water flow rate	Intermediate	Low	High	Minor decline	Low
Increase in temperature	Intermediate	Low	High	Decline	Moderate
Decrease in temperature	Tolerant*	Not relevant	Not sensitive*	Minor decline	Very low
Increase in turbidity	Low	High	Low	Minor decline	Moderate
Decrease in turbidity	Low	High	Low	Minor decline	Very low
Increase in wave exposure	Intermediate	Low	High	Decline	Low
Decrease in wave exposure	Tolerant*	Not relevant	Not sensitive*	No change	Low
Noise	Tolerant	Not relevant	Not sensitive	No change	High
Visual Presence	Tolerant	Not relevant	Not sensitive	No change	High
Abrasion & physical disturbance	High	Low	High	Decline	Moderate
Displacement	Intermediate	Low	High	Decline	Low

Chemical Factors

Click factor name to view rationale	Intolerance	Recoverability	Sensitivity	Species Richness	Evidence / Confidence
Synthetic compound contamination	High	Very low / none	Very High	Major decline	Very low
Heavy metal contamination	Low	High	Low	No change	Very low
Hydrocarbon contamination	Intermediate	High	Low	Minor decline	Low
Radionuclide contamination	Insufficient information	Not relevant	Insufficient information	Insufficient Information	Not relevant
Changes in nutrient levels	Low	Very high	Very low	Minor decline	Very low
Increase in salinity	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Decrease in salinity	High	Very low / none	Very High	Decline	Moderate
Changes in oxygenation	Intermediate	High	Low	Decline	Low

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		Low
Introduction of non-native species	Insufficient information	Not relevant	Insufficient information	Insufficient Information	Not relevant
Extraction of this species	High	Very low / none	Very High	Major decline	Low
Extraction of other species	High	Very low / none	Very High	Major decline	Low

Species used to indicate biotope intolerance

Physical factors

	Modiolus modiolus Key structural	Alcyonium digitatum Important characterizing	Ophiothrix fragilis Important characterizing	Echinus esculentus Important functional	Delesseria sanguinea Important other
Substratum Loss	High	High	High	High	High
Smothering	Intermediate	Intermediate	High	Intermediate	Intermediate
Increase in suspended sediment	Low	Low	Low	Low	Low
Decrease in suspended sediment	Low
Desiccation	High	Not relevant	Intermediate	Intermediate	High
Increase in emergence regime	High	Not relevant	Not relevant	Low	Intermediate
Decrease in emergence regime	Tolerant*
Increase in water flow rate	Intermediate	Tolerant*	Low	Low	Intermediate
Decrease in water flow rate	Intermediate	Intermediate
Increase in temperature	Intermediate	Low	Intermediate	Intermediate	Low
Decrease in temperature	Tolerant*	Low
Increase in turbidity	Low	Low	Low	Low	Tolerant
Decrease in turbidity	Tolerant*
Increase in wave exposure	Intermediate	Tolerant	Low	Low	Tolerant
Decrease in wave exposure	Tolerant*	Intermediate
Noise	Tolerant	Tolerant	Low	Tolerant	Tolerant
Visual Presence	Tolerant	Tolerant	Tolerant	Low	Tolerant
Abrasion & physical disturbance	High	Intermediate	Intermediate	Intermediate	Intermediate
Displacement	Low	High	Tolerant	Low	High

Chemical factors

	Modiolus modiolus Key structural	Alcyonium digitatum Important characterizing	Ophiothrix fragilis Important characterizing	Echinus esculentus Important functional	Delesseria sanguinea Important other
Synthetic compound contamination	Intermediate	Intermediate	Insufficient information	High	High
Heavy metal contamination	Low	Insufficient information	Insufficient information	High	Low
Hydrocarbon contamination	Low	Low	High	High	High
Radionuclide contamination	Insufficient information	Insufficient information	Insufficient information	Insufficient information	Insufficient information
Changes in nutrient levels	Low	Low	Intermediate	Tolerant*	Low
Increase in salinity	Not relevant	Intermediate	Low	Intermediate	Low
Decrease in salinity	High
Changes in oxygenation	Low	High	High	Intermediate	High

Biological factors

	Modiolus modiolus Key structural	Alcyonium digitatum Important characterizing	Ophiothrix fragilis Important characterizing	Echinus esculentus Important functional	Delesseria sanguinea Important other
Introduction of microbial pathogens/parasites	Low	Insufficient information	Low	Intermediate	Insufficient information
Introduction of non-native species	Insufficient information	Insufficient information	Tolerant	Not relevant	Not relevant
Extraction of this species	High	Not relevant	Not relevant	Intermediate	Not relevant
Extraction of other species	Intermediate	Intermediate	Tolerant	Intermediate	Tolerant*

Species used to indicate biotope recoverability

Physical factors

	Modiolus modiolus Key structural	Alcyonium digitatum Important characterizing	Ophiothrix fragilis Important characterizing	Echinus esculentus Important functional	Delesseria sanguinea Important other
Substratum Loss	Low	High	High	High	High
Smothering	Low	High	High	High	High
Increase in suspended sediment	Immediate	Very high	Very high	Very high	Immediate
Decrease in suspended sediment	Immediate
Desiccation	Low	Not relevant	High	High	High
Increase in emergence regime	Low	Not relevant	Not relevant	Very high	High
Decrease in emergence regime	Not relevant
Increase in water flow rate	Low	Not relevant	Very high	Very high	High
Decrease in water flow rate	Low	High
Increase in temperature	Low	High	High	High	Immediate
Decrease in temperature	Not relevant	High
Increase in turbidity	Very high	Very high	Very high	Very high	Not relevant
Decrease in turbidity	Not relevant
Increase in wave exposure	Low	Not relevant	Very high	Very high	Not relevant
Decrease in wave exposure	Not relevant	High
Noise	Not relevant	Not relevant	Very high	Not relevant	Not relevant
Visual Presence	Not relevant	Not relevant	Not relevant	Immediate	Not relevant
Abrasion & physical disturbance	Low	High	High	High	High
Displacement	Very high	High	Not relevant	Very high	High

Chemical factors

	Modiolus modiolus Key structural	Alcyonium digitatum Important characterizing	Ophiothrix fragilis Important characterizing	Echinus esculentus Important functional	Delesseria sanguinea Important other
Synthetic compound contamination	Low	High	Not relevant	High	High
Heavy metal contamination	Very high	Insufficient information	Not relevant	High	Very high
Hydrocarbon contamination	Very high	High	High	High	High
Radionuclide contamination	Not relevant	Insufficient information	Not relevant	Insufficient information	Not relevant
Changes in nutrient levels	Very high	High	High	Not relevant	Immediate
Increase in salinity	Not relevant	High	High	High	Immediate
Decrease in salinity	Low
Changes in oxygenation	Very high	High	High	High	High

Biological factors

	Modiolus modiolus Key structural	Alcyonium digitatum Important characterizing	Ophiothrix fragilis Important characterizing	Echinus esculentus Important functional	Delesseria sanguinea Important other
Introduction of microbial pathogens/parasites	Very high	Insufficient information	High	High	Insufficient information
Introduction of non-native species	Not relevant	Insufficient information	Not relevant	Not relevant	Not relevant
Extraction of this species	Low	Not relevant	Not relevant	High	Not relevant
Extraction of other species	Low	High	Not relevant	High	Not relevant

This review can be cited as follows:

Tyler-Walters, H. 2006. Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 21/05/2013]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=137&code=2004>

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Modiolus modiolus beds with hydroids and red seaweeds on tide-swept circalittoral mixed substrata

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SS.SBR.SMus.ModT