Biodiversity & Conservation

Sensitivity

Importance

Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock

IR.MIR.SedK.PolAhn

<i>%Polyides rotundus%</i>, <i>%Ahnfeltia plicata%</i> and <i>%Chondrus crispus%</i> on sand-covered infralittoral rock

IR.MIR.SedK.PolAhn 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	Moderate	Moderate	Major decline	High
Smothering	Intermediate	High	Low	Minor decline	Low
Increase in suspended sediment	Intermediate	High	Low	Minor decline	Low
Decrease in suspended sediment	Tolerant	Not relevant	Not sensitive	No change	High
Desiccation	High	High	Moderate	Decline	High
Increase in emergence regime	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Decrease in emergence regime	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Increase in water flow rate	Intermediate	High	Low	No change	Low
Decrease in water flow rate	Intermediate	High	Low	No change	Low
Increase in temperature	Low	Very high	Very low	No change	High
Decrease in temperature	Low	Very high	Very low	No change	High
Increase in turbidity	Low	Very high	Very low	Minor decline	Moderate
Decrease in turbidity	Tolerant	Not relevant	Not sensitive	No change	High
Increase in wave exposure	Intermediate	High	Low	Minor decline	High
Decrease in wave exposure	Intermediate	Very high	Low	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	Intermediate	High	Low	No change	Low
Displacement	High	High	Moderate	Decline	Low

Chemical Factors

Click factor name to view rationale	Intolerance	Recoverability	Sensitivity	Species Richness	Evidence / Confidence
Synthetic compound contamination	High	Moderate	Moderate	Major decline	Low
Heavy metal contamination	Insufficient information	Insufficient information	Insufficient information	Insufficient Information	Not relevant
Hydrocarbon contamination	High	High	Moderate	Major decline	Very low
Radionuclide contamination	Insufficient information	Insufficient information	Insufficient information	Insufficient Information	Not relevant
Changes in nutrient levels	Intermediate	High	Low	No change	Moderate
Increase in salinity	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Decrease in salinity	Low	Very high	Very low	Minor decline	High
Changes in oxygenation	Low	Very high	Very low	No change	Very low

Biological Factors

Click factor name to view rationale	Intolerance	Recoverability	Sensitivity	Species Richness	Evidence / Confidence
Introduction of microbial pathogens/parasites	Intermediate	High	Low		Moderate
Introduction of non-native species	Insufficient information	Insufficient information	Insufficient information	Insufficient Information	Not relevant
Extraction of this species	High	Moderate	Moderate	Major decline	Low
Extraction of other species	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant

Species used to indicate biotope intolerance

Physical factors

	Ahnfeltia plicata Important characterizing	Chondrus crispus Important characterizing	Furcellaria lumbricalis Important characterizing	Urticina felina Important other
Substratum Loss	High	High	High	High
Smothering	Intermediate	Intermediate	Intermediate	Low
Increase in suspended sediment	Intermediate	Intermediate	Intermediate	Low
Decrease in suspended sediment	Tolerant	Tolerant	Tolerant	Tolerant*
Desiccation	Low	Intermediate	High	Intermediate
Increase in emergence regime	Intermediate	Intermediate	Intermediate	Intermediate
Decrease in emergence regime	Tolerant	Tolerant	Tolerant	Tolerant*
Increase in water flow rate	Intermediate	Intermediate	Intermediate	Tolerant
Decrease in water flow rate	Intermediate	Intermediate	Tolerant	Intermediate
Increase in temperature	Low	Low	Low	Intermediate
Decrease in temperature	Low	Low	Tolerant	Intermediate
Increase in turbidity	Intermediate	Low	Tolerant	Tolerant
Decrease in turbidity	Tolerant*	Tolerant*	Tolerant	Tolerant
Increase in wave exposure	Intermediate	Intermediate	Intermediate	Tolerant
Decrease in wave exposure	Low	Low	Tolerant	Intermediate
Noise	Tolerant	Tolerant	Tolerant	Tolerant
Visual Presence	Tolerant	Tolerant	Tolerant	Tolerant
Abrasion & physical disturbance	Intermediate	Low	Intermediate	Intermediate
Displacement	High	High	Low	Low

Chemical factors

	Ahnfeltia plicata Important characterizing	Chondrus crispus Important characterizing	Furcellaria lumbricalis Important characterizing	Urticina felina Important other
Synthetic compound contamination	High	High	High	Intermediate
Heavy metal contamination	Insufficient information	Insufficient information	Insufficient information	Insufficient information
Hydrocarbon contamination	High	Low	High	Low
Radionuclide contamination	Insufficient information	Insufficient information	Insufficient information	Insufficient information
Changes in nutrient levels	Intermediate	Intermediate	Intermediate	Insufficient information
Increase in salinity	Not relevant	Tolerant	Low	Not relevant
Decrease in salinity	Low	Low	Tolerant	Low
Changes in oxygenation	Insufficient information	Insufficient information	Insufficient information	Intermediate

Biological factors

	Ahnfeltia plicata Important characterizing	Chondrus crispus Important characterizing	Furcellaria lumbricalis Important characterizing	Urticina felina Important other
Introduction of microbial pathogens/parasites	Insufficient information	Intermediate	Insufficient information	Insufficient information
Introduction of non-native species	Insufficient information	Insufficient information	Insufficient information	Insufficient information
Extraction of this species	Not relevant	Intermediate	High	High
Extraction of other species	Insufficient information	Insufficient information	Intermediate	Tolerant

Species used to indicate biotope recoverability

Physical factors

	Ahnfeltia plicata Important characterizing	Chondrus crispus Important characterizing	Furcellaria lumbricalis Important characterizing	Urticina felina Important other
Substratum Loss	High	High	Moderate	Moderate
Smothering	High	High	Moderate	Very high
Increase in suspended sediment	High	High	Moderate	Very high
Decrease in suspended sediment	Not relevant	Not relevant	Not relevant	Not relevant
Desiccation	Immediate	High	Moderate	Moderate
Increase in emergence regime	High	High	Moderate	Moderate
Decrease in emergence regime	Not relevant	Not relevant	Not relevant	Not relevant
Increase in water flow rate	High	High	Moderate	Not relevant
Decrease in water flow rate	High	High	Not relevant	Moderate
Increase in temperature	Very high	Very high	Very high	High
Decrease in temperature	Very high	Very high	Not relevant	High
Increase in turbidity	High	Very high	Not relevant	Not relevant
Decrease in turbidity	Not relevant	Not relevant	Not relevant	Not relevant
Increase in wave exposure	High	High	Moderate	Not relevant
Decrease in wave exposure	Very high	Very high	Not relevant	High
Noise	Not relevant	Not relevant	Not relevant	Not relevant
Visual Presence	Not relevant	Not relevant	Not relevant	Not relevant
Abrasion & physical disturbance	High	Very high	Moderate	Moderate
Displacement	High	High	Very high	Immediate

Chemical factors

	Ahnfeltia plicata Important characterizing	Chondrus crispus Important characterizing	Furcellaria lumbricalis Important characterizing	Urticina felina Important other
Synthetic compound contamination	High	High	Moderate	Moderate
Heavy metal contamination	Insufficient information	Insufficient information	Not relevant	Insufficient information
Hydrocarbon contamination	High	Very high	Moderate	Very high
Radionuclide contamination	Insufficient information	Insufficient information	Not relevant	Insufficient information
Changes in nutrient levels	High	High	Moderate	Insufficient information
Increase in salinity	Not relevant	Not relevant	Very high	Not relevant
Decrease in salinity	Very high	Very high	Not relevant	Very high
Changes in oxygenation	Insufficient information	Insufficient information	Not relevant	High

Biological factors

	Ahnfeltia plicata Important characterizing	Chondrus crispus Important characterizing	Furcellaria lumbricalis Important characterizing	Urticina felina Important other
Introduction of microbial pathogens/parasites	Insufficient information	High	Not relevant	Insufficient information
Introduction of non-native species	Insufficient information	Insufficient information	Not relevant	Insufficient information
Extraction of this species	Not relevant	High	Moderate	Moderate
Extraction of other species	Insufficient information	Insufficient information	Moderate	Not relevant

This review can be cited as follows:

Rayment, W.J. 2002. Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 20/05/2013]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=222&code=1997>

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Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock

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IR.MIR.SedK.PolAhn