Biodiversity & Conservation

Sensitivity

Importance

Hydroids, ephemeral seaweeds and Littorina littorea in shallow eulittoral mixed substrata pools

LR.FLR.Rkp.H

Hydroids, ephemeral seaweeds and <i>%Littorina littorea%</i> in shallow eulittoral mixed substrata pools

LR.FLR.Rkp.H 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 high	Low	Major decline	High
Smothering	High	Very high	Low	Major decline	Moderate
Increase in suspended sediment	Low	Immediate	Not sensitive	No change	Low
Decrease in suspended sediment	Tolerant*	Not relevant	Not sensitive*	Not relevant	Low
Desiccation	High	Very high	Low	Major decline	Moderate
Increase in emergence regime	Intermediate	Very high	Low	Decline	Low
Decrease in emergence regime	Tolerant*	Not relevant	Not sensitive*	Rise	Very low
Increase in water flow rate	High	Very high	Low	Major decline	Very low
Decrease in water flow rate	Tolerant	Not relevant	Not sensitive	Not relevant	Very low
Increase in temperature	High	Very high	Low	Decline	Moderate
Decrease in temperature	Intermediate	Very high	Low	Decline	Moderate
Increase in turbidity	Low	Immediate	Not sensitive	No change	Moderate
Decrease in turbidity	Tolerant*	Not relevant	Not sensitive*	No change	Low
Increase in wave exposure	High	Very high	Low	Major decline	Low
Decrease in wave exposure	High	Very high	Low	Decline	Low
Noise	Tolerant	Not relevant	Not sensitive	Not relevant	Moderate
Visual Presence	Tolerant	Not relevant	Not sensitive	Not relevant	Moderate
Abrasion & physical disturbance	Intermediate	Very high	Low	Decline	Low
Displacement	Intermediate	Very high	Low	Minor decline	Moderate

Chemical Factors

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

Biological Factors

Click factor name to view rationale	Intolerance	Recoverability	Sensitivity	Species Richness	Evidence / Confidence
Introduction of microbial pathogens/parasites	Insufficient information	Insufficient information	Insufficient information	Not relevant	Not relevant
Introduction of non-native species	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Extraction of this species	Intermediate	Very high	Low	No change	Low
Extraction of other species	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant

Species used to indicate biotope intolerance

Physical factors

	Obelia longissima Important characterizing	Littorina littorea Important characterizing	Ulva intestinalis Important characterizing	Mytilus edulis Important other	Semibalanus balanoides Important other
Substratum Loss	High	High	High	High	High
Smothering	Intermediate	High	High	Intermediate	Intermediate
Increase in suspended sediment	Intermediate	Intermediate	Intermediate	Low	Low
Decrease in suspended sediment	Low		Tolerant	Low
Desiccation	High	Low	Low	Low	Intermediate
Increase in emergence regime	Intermediate	Low	Tolerant*	Low	High
Decrease in emergence regime	Tolerant*		Low	Low
Increase in water flow rate	Intermediate	Intermediate	Intermediate	Low	Low
Decrease in water flow rate	Intermediate		Tolerant	Low
Increase in temperature	High	Low	Tolerant*	Low	Intermediate
Decrease in temperature	Low		Tolerant	Low
Increase in turbidity	Low	Low	Low	Tolerant	Low
Decrease in turbidity	Low		Tolerant*	Tolerant
Increase in wave exposure	Low	Intermediate	Low	Intermediate	Low
Decrease in wave exposure	Intermediate		Tolerant	Intermediate
Noise	Tolerant	Tolerant	Not relevant	Tolerant*	Tolerant
Visual Presence	Tolerant	Tolerant	Not relevant	Tolerant*	Tolerant
Abrasion & physical disturbance	Intermediate	Intermediate	High	Intermediate	Intermediate
Displacement	Intermediate	Tolerant	Tolerant	Intermediate	High

Chemical factors

	Obelia longissima Important characterizing	Littorina littorea Important characterizing	Ulva intestinalis Important characterizing	Mytilus edulis Important other	Semibalanus balanoides Important other
Synthetic compound contamination	Intermediate	Low	Intermediate	Intermediate	Intermediate
Heavy metal contamination	Intermediate	Intermediate	Low	Intermediate	Low
Hydrocarbon contamination	Insufficient information	High	High	Intermediate	Intermediate
Radionuclide contamination	Insufficient information	Insufficient information	Insufficient information	Insufficient information	Insufficient information
Changes in nutrient levels	Tolerant*	Tolerant	Tolerant*	Intermediate	Intermediate
Increase in salinity	Insufficient information	Tolerant	Tolerant	Low	Low
Decrease in salinity	Intermediate		Tolerant	Low
Changes in oxygenation	Low	Low	Insufficient information	Low	Intermediate

Biological factors

	Obelia longissima Important characterizing	Littorina littorea Important characterizing	Ulva intestinalis Important characterizing	Mytilus edulis Important other	Semibalanus balanoides Important other
Introduction of microbial pathogens/parasites	Low	Insufficient information	Insufficient information	Intermediate	Intermediate
Introduction of non-native species	Insufficient information	Insufficient information	Not relevant	Insufficient information	Intermediate
Extraction of this species	Not relevant	Intermediate	Intermediate	Intermediate	Not relevant
Extraction of other species	Not relevant	Tolerant	Not relevant	Low	Intermediate

Species used to indicate biotope recoverability

Physical factors

	Obelia longissima Important characterizing	Littorina littorea Important characterizing	Ulva intestinalis Important characterizing	Mytilus edulis Important other	Semibalanus balanoides Important other
Substratum Loss	Very high	High	Very high	High	High
Smothering	Very high	High	Very high	High	High
Increase in suspended sediment	Very high	High	Very high	Immediate	Very high
Decrease in suspended sediment	Immediate		Not relevant	Immediate
Desiccation	Very high	Immediate	Very high	Immediate	High
Increase in emergence regime	Very high	Immediate	Not relevant	Very high	High
Decrease in emergence regime	Not relevant		Very high	Very high
Increase in water flow rate	Very high	High	Very high	Very high	Very high
Decrease in water flow rate	Very high		Not relevant	Very high
Increase in temperature	Very high	Immediate	Not relevant	Very high	High
Decrease in temperature	Immediate		Not relevant	Very high
Increase in turbidity	Immediate	Very high	Very high	Not relevant	Very high
Decrease in turbidity	Immediate		Not relevant	Not relevant
Increase in wave exposure	Immediate	High	Very high	High	High
Decrease in wave exposure	Very high		Not relevant	High
Noise	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Visual Presence	Not relevant	Not relevant	Not relevant	Not relevant	Not relevant
Abrasion & physical disturbance	Very high	High	Very high	High	High
Displacement	Very high	Not relevant	Not relevant	High	High

Chemical factors

	Obelia longissima Important characterizing	Littorina littorea Important characterizing	Ulva intestinalis Important characterizing	Mytilus edulis Important other	Semibalanus balanoides Important other
Synthetic compound contamination	Very high	Very high	High	High	Moderate
Heavy metal contamination	Very high	High	Very high	High	High
Hydrocarbon contamination	Not relevant	High	Very high	High	Moderate
Radionuclide contamination	Not relevant	Insufficient information	Not relevant	Not relevant	Not relevant
Changes in nutrient levels	Not relevant	Not relevant	Not relevant	High	High
Increase in salinity	Not relevant	Not relevant	Not relevant	Very high	High
Decrease in salinity	Very high		Not relevant	Very high
Changes in oxygenation	Immediate	Very high	Not relevant	Very high	High

Biological factors

	Obelia longissima Important characterizing	Littorina littorea Important characterizing	Ulva intestinalis Important characterizing	Mytilus edulis Important other	Semibalanus balanoides Important other
Introduction of microbial pathogens/parasites	Immediate	Insufficient information	Not relevant	High	High
Introduction of non-native species	Not relevant	Insufficient information	Not relevant	Not relevant	High
Extraction of this species	Not relevant	High	Very high	High	Not relevant
Extraction of other species	Not relevant	Not relevant	Not relevant	Very high	High

This review can be cited as follows:

Marshall, C.E. 2005. Hydroids, ephemeral seaweeds and Littorina littorea in shallow eulittoral mixed substrata pools. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 20/06/2013]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=54&code=2004>

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Hydroids, ephemeral seaweeds and Littorina littorea in shallow eulittoral mixed substrata pools

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LR.FLR.Rkp.H