Description of biotope or habitat type
Ulothrix flacca and Urospora spp. on freshwater-influenced vertical littoral fringe soft rock
Physical habitat description
|Full (30-35 ppt)
|Vertical soft rock
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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.
An assemblage of the small un-branched filamentous green seaweeds Ulothrix flacca, Urospora penicilliformis and Urospora wormskioldii at High Water Spring Tide level on steep and vertical rock often influenced by freshwater. The community is also present in areas with freshwater seepage. It is visually recognised as a closely adherent, often shiny, green mat of filamentous growth. Associated species include the green seaweeds Blidingia minima and Ulva prolifera, the barnacle Semibalanus balanoides and the limpet Patella vulgata, but these species are not common. Although this biotope does occur on rock other than chalk, this description has been derived from chalk coast sites. More information is needed to improve this description.
On chalk coasts this community can include Ulva spp. and the transition from UloUro to Ulv is often indistinct and a mixed zone of UloUro and Ulv can occur.
This biotope is more easily identifiable from autumn to spring as both Urospora spp. and Bangia atropurpurea may dry out and disappear during the summer. In late winter the red seaweed B. atropurpurea may be predominant and the community then appears as shiny blackish mats of filamentous growth.
|Relative importance of taxon for defining this community (%)
|Typical abundance - SACFOR scale
|% of core records where taxon was recorded
Similar biotopes or habitat types
Classification history of this biotope or habitat type