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Biodiversity & Conservation
| Basic Information | Biotope classification | Ecology | Habitat preferences and distribution | Species composition | Sensitivity | Importance |
Alaria esculenta on exposed sublittoral fringe bedrock
IR.EIR.KFaR.Ala
Image Roger Mitchell - Exposed sublittoral fringe bedrock with Alaria esculenta, Isles of Scilly. Image width ca 1 m.
Image copyright information
IR.EIR.KFaR.Ala 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 | Decline | Moderate |
| Increase in suspended sediment | Intermediate | High | Low | Decline | Moderate |
| Decrease in suspended sediment | |||||
| Desiccation | High | High | Moderate | Major decline | Moderate |
| Increase in emergence regime | Intermediate | High | Low | Minor decline | Low |
| Decrease in emergence regime | |||||
| Increase in water flow rate | Intermediate | High | Low | Minor decline | Low |
| Decrease in water flow rate | |||||
| Increase in temperature | High | High | Moderate | Decline | Moderate |
| Decrease in temperature | |||||
| Increase in turbidity | Low | High | Low | No change | Low |
| Decrease in turbidity | |||||
| Increase in wave exposure | High | High | Moderate | Minor decline | Moderate |
| Decrease in wave exposure | |||||
| Noise | Tolerant | Not relevant | Not sensitive | Not relevant | High |
| Visual Presence | Tolerant | Not relevant | Not sensitive | Not relevant | High |
| Abrasion & physical disturbance | Low | High | Low | Decline | Low |
| Displacement | High | High | Moderate | Major 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 | Immediate | Very low | Decline | Low |
| Hydrocarbon contamination | High | High | Moderate | Major decline | Low |
| Radionuclide contamination | Insufficient information | Insufficient information | Insufficient information | Insufficient Information | Not relevant |
| Changes in nutrient levels | Intermediate | High | Low | Minor decline | Low |
| Increase in salinity | High | High | Moderate | Decline | Moderate |
| Decrease in salinity | |||||
| 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 | Moderate | |
| Introduction of non-native species | Low | Immediate | Not sensitive | No change | Low |
| Extraction of this species | Intermediate | High | Low | Decline | Low |
| Extraction of other species | Not relevant | Not relevant | Not relevant | Not relevant | Not relevant |
Species used to indicate biotope intolerance
Physical factors
| Alaria esculenta Key structural | Corallina officinalis Important characterizing | |
| Substratum Loss | High | High |
| Smothering | Intermediate | Intermediate |
| Increase in suspended sediment | Intermediate | Intermediate |
| Decrease in suspended sediment | ||
| Desiccation | High | High |
| Increase in emergence regime | Intermediate | Intermediate |
| Decrease in emergence regime | ||
| Increase in water flow rate | Intermediate | Low |
| Decrease in water flow rate | ||
| Increase in temperature | High | Intermediate |
| Decrease in temperature | ||
| Increase in turbidity | Low | Low |
| Decrease in turbidity | ||
| Increase in wave exposure | High | Low |
| Decrease in wave exposure | ||
| Noise | Tolerant | Tolerant |
| Visual Presence | Tolerant | Tolerant |
| Abrasion & physical disturbance | Intermediate | Low |
| Displacement | High | Low |
Chemical factors
| Alaria esculenta Key structural | Corallina officinalis Important characterizing |
|
| Synthetic compound contamination | Intermediate | Intermediate |
| Heavy metal contamination | Intermediate | Insufficient information |
| Hydrocarbon contamination | Low | Low |
| Radionuclide contamination | Insufficient information | Insufficient information |
| Changes in nutrient levels | Intermediate | Low |
| Increase in salinity | High | Intermediate |
| Decrease in salinity | ||
| Changes in oxygenation | Insufficient information | Insufficient information |
Biological factors
| Alaria esculenta Key structural | Corallina officinalis Important characterizing |
|
| Introduction of microbial pathogens/parasites | Low | Low |
| Introduction of non-native species | Low | Not relevant |
| Extraction of this species | Intermediate | Intermediate |
| Extraction of other species | Intermediate | Intermediate |
Species used to indicate biotope recoverability
Physical factors
| Alaria esculenta Key structural | Corallina officinalis Important characterizing | |
| Substratum Loss | High | High |
| Smothering | High | Very high |
| Increase in suspended sediment | High | Very high |
| Decrease in suspended sediment | ||
| Desiccation | High | High |
| Increase in emergence regime | High | Very high |
| Decrease in emergence regime | ||
| Increase in water flow rate | High | Very high |
| Decrease in water flow rate | ||
| Increase in temperature | High | High |
| Decrease in temperature | ||
| Increase in turbidity | High | Immediate |
| Decrease in turbidity | ||
| Increase in wave exposure | High | Very high |
| Decrease in wave exposure | ||
| Noise | Not relevant | Not relevant |
| Visual Presence | Not relevant | Not relevant |
| Abrasion & physical disturbance | High | High |
| Displacement | High | High |
Chemical factors
| Alaria esculenta Key structural | Corallina officinalis Important characterizing |
|
| Synthetic compound contamination | High | High |
| Heavy metal contamination | High | Insufficient information |
| Hydrocarbon contamination | Immediate | Very high |
| Radionuclide contamination | Insufficient information | Insufficient information |
| Changes in nutrient levels | High | Very high |
| Increase in salinity | High | High |
| Decrease in salinity | ||
| Changes in oxygenation | Not relevant | Insufficient information |
Biological factors
| Alaria esculenta Key structural | Corallina officinalis Important characterizing |
|
| Introduction of microbial pathogens/parasites | Immediate | Very high |
| Introduction of non-native species | Immediate | Not relevant |
| Extraction of this species | High | High |
| Extraction of other species | Moderate | High |
This review can be cited as follows:
Tyler-Walters, H. 2000. Alaria esculenta on exposed sublittoral fringe bedrock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 24/05/2013]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=165&code=1997>
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