Biodiversity & Conservation

Sensitivity

Importance

Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock

IR.SIR.Lag.FChoG

Image Sue Scott - Fucoids and Chorda filum submerged. Image width ca 40 cm (foreground).
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IR.SIR.Lag.FChoG 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	High	High	Moderate	Decline	Moderate
Increase in suspended sediment	Low	Very high	Very low	No change	Moderate
Decrease in suspended sediment	Low	Very high	Very low	No change	Moderate
Desiccation	Intermediate	High	Low	Minor decline	Moderate
Increase in emergence regime	Intermediate	High	Low	Minor decline	Moderate
Decrease in emergence regime	Not relevant	Not relevant	Not relevant	No change	Moderate
Increase in water flow rate	Low	Very high	Very low	No change	Low
Decrease in water flow rate	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
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	No change	Low
Decrease in turbidity	Tolerant*	Very high	Not sensitive*	No change	Low
Increase in wave exposure	Intermediate	High	Low	Minor decline	Moderate
Decrease in wave exposure	Not relevant	Not relevant	Not relevant	No change	High
Noise	Tolerant	Not relevant	Not sensitive	Not relevant	Not relevant
Visual Presence	Tolerant	Not relevant	Not sensitive	Not relevant	Not relevant
Abrasion & physical disturbance	Intermediate	High	Low	Decline	Moderate
Displacement	High	High	Moderate	Major decline	High

Chemical Factors

Click factor name to view rationale	Intolerance	Recoverability	Sensitivity	Species Richness	Evidence / Confidence
Synthetic compound contamination	High	High	Moderate	Decline	Low
Heavy metal contamination	Low	Very high	Very low	No change	Low
Hydrocarbon contamination	Low	High	Low	No change	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	Intermediate	High	Low	Decline	Low
Decrease in salinity	Intermediate	High	Low	Minor decline	Low
Changes in oxygenation	Intermediate	Very high	Low	No change	Low

Biological Factors

Click factor name to view rationale	Intolerance	Recoverability	Sensitivity	Species Richness	Evidence / Confidence
Introduction of microbial pathogens/parasites	Low	High	Low		Moderate
Introduction of non-native species	Intermediate	High	Low	Minor decline	Moderate
Extraction of this species	Intermediate	High	Low	No change	Moderate
Extraction of other species	Low	High	Low	No change	Low

Species used to indicate biotope intolerance

Physical factors

	Fucus serratus Important characterizing	Fucus vesiculosus Important characterizing	Chorda filum Important characterizing
Substratum Loss	High	Intermediate	High
Smothering	High	High	Intermediate
Increase in suspended sediment	Low	Low	Tolerant
Decrease in suspended sediment			Tolerant
Desiccation	Intermediate	Intermediate	High
Increase in emergence regime	Intermediate	Intermediate	High
Decrease in emergence regime			Tolerant*
Increase in water flow rate	Intermediate	Intermediate	Intermediate
Decrease in water flow rate			High
Increase in temperature	Tolerant	Tolerant	Low
Decrease in temperature			Low
Increase in turbidity	Low	Low	Low
Decrease in turbidity			Tolerant*
Increase in wave exposure	High	Intermediate	High
Decrease in wave exposure			Not relevant
Noise	Tolerant	Tolerant	Tolerant
Visual Presence	Tolerant	Tolerant	Tolerant
Abrasion & physical disturbance	Intermediate	Intermediate	Intermediate
Displacement	High	High	High

Chemical factors

	Fucus serratus Important characterizing	Fucus vesiculosus Important characterizing	Chorda filum Important characterizing
Synthetic compound contamination	High	Intermediate	Insufficient information
Heavy metal contamination	Low	Low	Insufficient information
Hydrocarbon contamination	Intermediate	Low	Insufficient information
Radionuclide contamination	Insufficient information	Insufficient information	Insufficient information
Changes in nutrient levels	Intermediate	Intermediate	Intermediate
Increase in salinity	Low	Low	Not relevant
Decrease in salinity			Low
Changes in oxygenation	Low	Insufficient information	Insufficient information

Biological factors

	Fucus serratus Important characterizing	Fucus vesiculosus Important characterizing	Chorda filum Important characterizing
Introduction of microbial pathogens/parasites	Insufficient information	Insufficient information	Insufficient information
Introduction of non-native species	Insufficient information	Insufficient information	Intermediate
Extraction of this species	Intermediate	Intermediate	Intermediate
Extraction of other species	Tolerant	Insufficient information	Insufficient information

Species used to indicate biotope recoverability

Physical factors

	Fucus serratus Important characterizing	Fucus vesiculosus Important characterizing	Chorda filum Important characterizing
Substratum Loss	High	High	High
Smothering	High	High	High
Increase in suspended sediment	Very high	Immediate	Not relevant
Decrease in suspended sediment			Not relevant
Desiccation	High	High	High
Increase in emergence regime	High	High	High
Decrease in emergence regime			Not relevant
Increase in water flow rate	High	High	High
Decrease in water flow rate			High
Increase in temperature	Not relevant	Not relevant	High
Decrease in temperature			High
Increase in turbidity	Very high	Immediate	Immediate
Decrease in turbidity			Not relevant
Increase in wave exposure	High	High	High
Decrease in wave exposure			Not relevant
Noise	Not relevant	Not relevant	Not relevant
Visual Presence	Not relevant	Not relevant	Not relevant
Abrasion & physical disturbance	High	High	High
Displacement	High	High	High

Chemical factors

	Fucus serratus Important characterizing	Fucus vesiculosus Important characterizing	Chorda filum Important characterizing
Synthetic compound contamination	High	High	Not relevant
Heavy metal contamination	High	High	Not relevant
Hydrocarbon contamination	High	High	Not relevant
Radionuclide contamination	Insufficient information	Not relevant	Not relevant
Changes in nutrient levels	High	High	High
Increase in salinity	Very high	High	Not relevant
Decrease in salinity			High
Changes in oxygenation	Very high	Not relevant	Not relevant

Biological factors

	Fucus serratus Important characterizing	Fucus vesiculosus Important characterizing	Chorda filum Important characterizing
Introduction of microbial pathogens/parasites	Insufficient information	Not relevant	Not relevant
Introduction of non-native species	Insufficient information	Not relevant	High
Extraction of this species	High	High	High
Extraction of other species	Not relevant	Not relevant	Not relevant

This review can be cited as follows:

Hill, J.M. 2001. Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 23/05/2013]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=356&code=1997>

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Mixed fucoids, Chorda filum and green seaweeds on reduced salinity infralittoral rock

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IR.SIR.Lag.FChoG