Biodiversity & Conservation

Ocnus planci aggregations on sheltered sublittoral muddy sediment

SS.SMu.IFiMu.Ocn


IMU.Ocn

Image Dominic Counsell - Aggregation of Ocnus planci on broken shell and cobbles. Image width ca 40 cm.
Image copyright information

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Distribution map

SS.SMu.IFiMu.Ocn recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)


  • EC_Habitats

Habitat sensitivity

Physical Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Substratum Loss High Moderate Moderate Major decline Low
Smothering Intermediate High Low Decline Low
Increase in suspended sediment Low Very high Very low No change Low
Decrease in suspended sediment Low Very high Very low No change Low
Desiccation Not relevant Not relevant Not relevant Not relevant Not relevant
Increase in emergence regime Tolerant Not relevant Not sensitive No change Low
Decrease in emergence regime Not relevant Not relevant Not relevant Not relevant Not relevant
Increase in water flow rate High Moderate Moderate Major decline Low
Decrease in water flow rate Low Very high Very low Minor decline Low
Increase in temperature Low Very high Very low No change Low
Decrease in temperature Low Very high Very low Minor decline Low
Increase in turbidity Tolerant Not relevant Not sensitive No change Low
Decrease in turbidity Low Very high Very low Minor decline Low
Increase in wave exposure High Moderate Moderate Major decline Low
Decrease in wave exposure Not relevant Not relevant Not relevant Not relevant Not relevant
Noise Tolerant Not relevant Not sensitive Not relevant High
Visual Presence Tolerant None Not sensitive Not relevant High
Abrasion & physical disturbance Intermediate High Low Decline Low
Displacement Low Very high Very low Minor decline Low

Chemical Factors

Click factor name to view rationale Intolerance Recoverability Sensitivity Species Richness Evidence / Confidence
Synthetic compound contamination Intermediate High Low Decline Very low
Heavy metal contamination Intermediate High Low Minor decline Very low
Hydrocarbon contamination High Moderate Moderate Major decline Low
Radionuclide contamination Insufficient information Not relevant Insufficient information Insufficient Information Not relevant
Changes in nutrient levels Intermediate High Low Decline Low
Increase in salinity Not relevant None Not relevant Not relevant Not relevant
Decrease in salinity High Moderate Moderate Major decline Low
Changes in oxygenation High Moderate Moderate Major decline Moderate

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 Insufficient information Not relevant Insufficient information Insufficient Information Not relevant
Extraction of this species Not relevant Not relevant Not relevant Not relevant Not relevant
Extraction of other species Not relevant Not relevant Not relevant Not relevant Not relevant

This review can be cited as follows:

Tyler-Walters, H. 2002. Ocnus planci aggregations on sheltered sublittoral muddy sediment. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 21/12/2014]. Available from: <http://www.marlin.ac.uk/habitatsensitivity.php?habitatid=325&code=2004>