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Biodiversity & Conservation
| Basic Information | Biotope classification | Ecology | Habitat preferences and distribution | Species composition | Sensitivity | Importance |
Halichondria bowerbanki, Eudendrium arbusculum and Eucratea loricata on reduced salinity tide-swept circalittoral mixed substrata
CR.MCR.CFaVS.HbowEud
CR.MCR.CFaVS.HbowEud 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 | Low | Immediate | Not sensitive | No change | Moderate |
| Decrease in suspended sediment | Low | Immediate | Not sensitive | No change | Moderate |
| Desiccation | Not relevant | Not relevant | Not relevant | Not relevant | Not relevant |
| 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 | High | High | Moderate | Decline | Moderate |
| Decrease in water flow rate | High | High | Moderate | Decline | Very low |
| Increase in temperature | Tolerant | Not relevant | Not sensitive | No change | Moderate |
| Decrease in temperature | Tolerant | Not relevant | Not sensitive | No change | Moderate |
| Increase in turbidity | Tolerant | Not relevant | Not sensitive | No change | Moderate |
| Decrease in turbidity | Tolerant | Not relevant | Not sensitive | No change | Moderate |
| Increase in wave exposure | High | High | Moderate | Decline | Low |
| Decrease in wave exposure | Not relevant | Not relevant | Not relevant | Not relevant | High |
| 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 | Decline | High |
| 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 | Intermediate | High | Low | Minor decline | Low |
| Heavy metal contamination | Low | Very high | Very low | No change | Moderate |
| Hydrocarbon contamination | Intermediate | High | Low | Minor decline | Low |
| Radionuclide contamination | Insufficient information | Not relevant | Insufficient information | Insufficient Information | Not relevant |
| Changes in nutrient levels | Low | Very high | Very low | No change | Low |
| Increase in salinity | High | High | Moderate | Decline | Moderate |
| Decrease in salinity | High | High | Moderate | Major decline | Moderate |
| Changes in oxygenation | Intermediate | High | Low | Minor decline | Moderate |
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 | Tolerant | Not relevant | Not sensitive | Not relevant | High |
| Extraction of this species | Not relevant | Not relevant | Not relevant | Not relevant | High |
| Extraction of other species | Not relevant | Not relevant | Not relevant | Not relevant | High |
Species used to indicate biotope intolerance
Physical factors
| Balanus crenatus Important structural | Ascidiella scabra Important structural | Asterias rubens Important structural | Metridium senile Important characterizing | |
| Substratum Loss | High | High | High | High |
| Smothering | High | Low | Low | Low |
| Increase in suspended sediment | Low | Low | Low | Low |
| Decrease in suspended sediment | Tolerant | Tolerant* | ||
| Desiccation | High | Intermediate | High | Intermediate |
| Increase in emergence regime | High | Intermediate | Tolerant | High |
| Decrease in emergence regime | Tolerant* | Tolerant* | ||
| Increase in water flow rate | Low | Low | Intermediate | Intermediate |
| Decrease in water flow rate | Low | Low | ||
| Increase in temperature | High | Tolerant | High | Tolerant |
| Decrease in temperature | Tolerant | Low | Tolerant | |
| Increase in turbidity | Low | Tolerant | Low | Tolerant* |
| Decrease in turbidity | Tolerant* | Intermediate | ||
| Increase in wave exposure | Low | Intermediate | Intermediate | Low |
| Decrease in wave exposure | Tolerant* | Low | Tolerant* | |
| Noise | Tolerant | Tolerant | Tolerant | Tolerant |
| Visual Presence | Tolerant | Tolerant | Tolerant | Tolerant |
| Abrasion & physical disturbance | Intermediate | High | Intermediate | Intermediate |
| Displacement | High | High | Low | Low |
Chemical factors
| Balanus crenatus Important structural | Ascidiella scabra Important structural | Asterias rubens Important structural | Metridium senile Important characterizing |
|
| Synthetic compound contamination | High | Intermediate | Intermediate | Low |
| Heavy metal contamination | Intermediate | Insufficient information | Intermediate | Insufficient information |
| Hydrocarbon contamination | Low | Insufficient information | High | Low |
| Radionuclide contamination | Insufficient information | Insufficient information | Insufficient information | Insufficient information |
| Changes in nutrient levels | Intermediate | Insufficient information | Low | Tolerant* |
| Increase in salinity | Low | Tolerant | High | Low |
| Decrease in salinity | Intermediate | Low | ||
| Changes in oxygenation | High | Low | High | Tolerant |
Biological factors
| Balanus crenatus Important structural | Ascidiella scabra Important structural | Asterias rubens Important structural | Metridium senile Important characterizing |
|
| Introduction of microbial pathogens/parasites | Insufficient information | Insufficient information | Intermediate | Insufficient information |
| Introduction of non-native species | Insufficient information | Tolerant | Insufficient information | Tolerant |
| Extraction of this species | Not relevant | Not relevant | Not relevant | High |
| Extraction of other species | Not relevant | Not relevant | Low | High |
Species used to indicate biotope recoverability
Physical factors
| Balanus crenatus Important structural | Ascidiella scabra Important structural | Asterias rubens Important structural | Metridium senile Important characterizing | |
| Substratum Loss | High | Very high | High | High |
| Smothering | High | Immediate | Very high | Immediate |
| Increase in suspended sediment | High | Immediate | High | Immediate |
| Decrease in suspended sediment | Not relevant | Not relevant | ||
| Desiccation | High | Very high | High | High |
| Increase in emergence regime | High | Very high | Not relevant | High |
| Decrease in emergence regime | Not relevant | Not relevant | ||
| Increase in water flow rate | Very high | Immediate | High | Very high |
| Decrease in water flow rate | Immediate | Very high | ||
| Increase in temperature | High | Not relevant | High | Not relevant |
| Decrease in temperature | Not relevant | High | Not relevant | |
| Increase in turbidity | Very high | Not relevant | Very high | Not relevant |
| Decrease in turbidity | Not relevant | High | ||
| Increase in wave exposure | Very high | Very high | High | Immediate |
| Decrease in wave exposure | Not relevant | High | Not relevant | |
| 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 | High | Very high |
| Displacement | High | Very high | Immediate | Very high |
Chemical factors
| Balanus crenatus Important structural | Ascidiella scabra Important structural | Asterias rubens Important structural | Metridium senile Important characterizing |
|
| Synthetic compound contamination | High | Very high | High | Very high |
| Heavy metal contamination | High | Not relevant | High | Not relevant |
| Hydrocarbon contamination | High | Not relevant | High | Immediate |
| Radionuclide contamination | Not relevant | Not relevant | Insufficient information | Not relevant |
| Changes in nutrient levels | High | Not relevant | High | Not relevant |
| Increase in salinity | Very high | Not relevant | High | Immediate |
| Decrease in salinity | Very high | Very high | ||
| Changes in oxygenation | High | Immediate | High | Not relevant |
Biological factors
| Balanus crenatus Important structural | Ascidiella scabra Important structural | Asterias rubens Important structural | Metridium senile Important characterizing |
|
| Introduction of microbial pathogens/parasites | Not relevant | Not relevant | High | Not relevant |
| Introduction of non-native species | Not relevant | Not relevant | Insufficient information | Not relevant |
| Extraction of this species | Not relevant | Not relevant | Not relevant | High |
| Extraction of other species | Not relevant | Not relevant | High | High |
This review can be cited as follows:
Hiscock, K. 2002. Halichondria bowerbanki, Eudendrium arbusculum and Eucratea loricata on reduced salinity tide-swept circalittoral mixed substrata. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 19/06/2013]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=45&code=2004>
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