Description of biotope or habitat type
Pectenogammarus planicrurus in mid shore well-sorted gravel or coarse sand
Physical habitat description
|Salinity||Full (30-35 ppt)|
|Wave exposure||Moderately exposed|
|Substratum||Gravel; very coarse sand (no fine sand or mud)|
|Depth Band||Mid shore, Upper shore|
|Other Features||The lee of obstacles such as rocky outcrops and groynes|
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- Records used to define the biotope (core records)
- Other records assigned to this biotope, marked as 'certain'
- Other records assigned to this biotope, marked as 'uncertain'
Point data based on records in the UK Marine Recorder Snapshot.
Shores of well-sorted gravel with a predominant particle size of 4.0 mm but ranging between 3 and 6 mm support dense populations of the amphipod Pectenogammarus planicrurus. Material finer than 2 mm reduces the ability of the amphipod to survive. The amphipod is tolerant of variable salinity, although a preference for a specific salinity regime has not been determined. As this habitat is regularly under-surveyed, its distribution is unclear.
The biotope is often associated with the lee side (wind or tide) of obstacles such as rock outcrops and groynes; this may be due to the deposition of algal debris, shelter from wave action or degree of sorting due to localised tidal flow around the obstacle (most likely a combination of the first and last influence).
|Taxon||Relative importance of taxon for defining this community (%)||Typical abundance - SACFOR scale||Typical abundance - (count per m2)||% of core records where taxon was recorded|
|Pectenogammarus planicrurus||100||Frequent||7||81-100 %|
Similar biotopes or habitat types
Classification history of this biotope or habitat type