Biodiversity & Conservation

Sensitivity

Importance

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

IR.MIR.SedK.HalXK

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

IR.MIR.SedK.HalXK 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	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 Loss	High	High	High	High	High	High
Smothering	Intermediate	Intermediate	Intermediate	Intermediate	High	High
Increase in suspended sediment	Low	Low	Intermediate	Intermediate	Low	High
Decrease in suspended sediment	Tolerant		Tolerant	Tolerant
Desiccation	Intermediate	High	Intermediate	High	High	Intermediate
Increase in emergence regime	Intermediate	Intermediate	Intermediate	Intermediate	Intermediate	Intermediate
Decrease in emergence regime	Tolerant*		Tolerant	Tolerant
Increase in water flow rate	High	Intermediate	Intermediate	Intermediate	Low	Intermediate
Decrease in water flow rate	Low		Intermediate	Tolerant
Increase in temperature	Tolerant	Low	Low	Low	Intermediate	Low
Decrease in temperature	Tolerant		Low	Tolerant
Increase in turbidity	Intermediate	Tolerant	Low	Tolerant	Low	Low
Decrease in turbidity	Tolerant*		Tolerant*	Tolerant
Increase in wave exposure	High	Tolerant	Intermediate	Intermediate	High	Intermediate
Decrease in wave exposure	Tolerant*		Low	Tolerant
Noise	Tolerant	Tolerant	Tolerant	Tolerant	Tolerant	Tolerant
Visual Presence	Tolerant	Tolerant	Tolerant	Tolerant	Tolerant	Tolerant
Abrasion & physical disturbance	Intermediate	Intermediate	Low	Intermediate	Intermediate	Intermediate
Displacement	High	High	High	Low	Intermediate	High

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 contamination	Intermediate	High	High	High	Low	Insufficient information
Heavy metal contamination	Low	Low	Insufficient information	Insufficient information	Intermediate	Insufficient information
Hydrocarbon contamination	Low	High	Low	High	Low	Insufficient information
Radionuclide contamination	Insufficient information	Insufficient information	Insufficient information	Insufficient information	Insufficient information	Insufficient information
Changes in nutrient levels	Tolerant*	Low	Intermediate	Intermediate	Intermediate	Low
Increase in salinity	Low	Low	Tolerant	Low	High	Intermediate
Decrease in salinity	Low		Low	Tolerant
Changes in oxygenation	Insufficient information	High	Insufficient information	Insufficient information	Insufficient information	Intermediate

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/parasites	Insufficient information	Insufficient information	Intermediate	Insufficient information	Intermediate	Insufficient information
Introduction of non-native species	High	Not relevant	Insufficient information	Insufficient information	Insufficient information	Tolerant*
Extraction of this species	Not relevant	Not relevant	Intermediate	High	Intermediate	Not relevant
Extraction of other species	Tolerant*	Tolerant*	Insufficient information	Intermediate	Insufficient information	High

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 Loss	High	High	High	Moderate	High	High
Smothering	High	High	High	Moderate	High	High
Increase in suspended sediment	Very high	Immediate	High	Moderate	High	High
Decrease in suspended sediment	Not relevant		Not relevant	Not relevant
Desiccation	High	High	High	Moderate	High	High
Increase in emergence regime	High	High	High	Moderate	High	High
Decrease in emergence regime	Not relevant		Not relevant	Not relevant
Increase in water flow rate	High	High	High	Moderate	High	High
Decrease in water flow rate	Immediate		High	Not relevant
Increase in temperature	Not relevant	Immediate	Very high	Very high	High	Very high
Decrease in temperature	Not relevant		Very high	Not relevant
Increase in turbidity	High	Not relevant	Very high	Not relevant	High	Immediate
Decrease in turbidity	Not relevant		Not relevant	Not relevant
Increase in wave exposure	High	Not relevant	High	Moderate	High	Moderate
Decrease in wave exposure	Not relevant		Very high	Not relevant
Noise	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Visual Presence	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Abrasion & physical disturbance	High	High	Very high	Moderate	Very high	High
Displacement	High	High	High	Very high	High	Moderate

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 contamination	High	High	High	Moderate	High	Not relevant
Heavy metal contamination	Very high	Very high	Insufficient information	Not relevant	High	Not relevant
Hydrocarbon contamination	Very high	High	Very high	Moderate	High	Not relevant
Radionuclide contamination	Not relevant	Not relevant	Insufficient information	Not relevant	Not relevant	Not relevant
Changes in nutrient levels	Not relevant	Immediate	High	Moderate	High	High
Increase in salinity	Very high	Immediate	Not relevant	Very high	High	High
Decrease in salinity	Very high		Very high	Not relevant
Changes in oxygenation	Not relevant	High	Insufficient information	Not relevant	Not relevant	High

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/parasites	Not relevant	Insufficient information	High	Not relevant	High	High
Introduction of non-native species	High	Not relevant	Insufficient information	Not relevant	Not relevant	Not relevant
Extraction of this species	Not relevant	Not relevant	High	Moderate	High	Not relevant
Extraction of other species	Not relevant	Not relevant	Insufficient information	Moderate	Not relevant	Moderate

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 20/05/2013]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=258&code=1997>

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

for
IR.MIR.SedK.HalXK