Biodiversity & Conservation

Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock

IR.MIR.SedK.PolAhn


<i>%Polyides rotundus%</i>, <i>%Ahnfeltia plicata%</i> and <i>%Chondrus crispus%</i> on sand-covered infralittoral rock
Distribution map

IR.MIR.SedK.PolAhn recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)


  • EC_Habitats

Species indicative of sensitivity

To assess the sensitivity of the biotope, the sensitivity of component species is reviewed. Those species that are considered to be particularly indicative of the sensitivity of the biotope, and for which research has been undertaken in detail are shown below (see selection criteria). The biology of other component species of the biotope is also taken into account wherever information is known to the researcher.

Species found especially in this biotope

  • Ahnfeltia plicata
Community Importance Species name Common Name
Important characterizing Ahnfeltia plicata A red seaweed
Important characterizing Chondrus crispus Carragheen
Important characterizing Furcellaria lumbricalis A red seaweed
Important characterizing Polyides rotundus A red seaweed
Important other Urticina felina Dahlia anemone

Explanation

Ahnfeltia plicata, Chondrus crispus, Furcellaria lumbricalis and Polyides rotundus are the algal species which define the biotope. Loss of one of the species would result in loss of the biotope but would not result in changes in the function of the community as there are other species in the biotope which fulfil a similar role. The epifaunal and epiphytic communities would be lost along with the species but are also capable of attaching to other algal species or to bedrock where it is available, so would rapidly recolonize. Ahnfeltia plicata, Chondrus crispus, Furcellaria lumbricalis and Polyides rotundus are therefore assessed as "important characterizing" but not "key". It is likely that the sensitivity assessments for Furcellaria lumbricalis would also apply reasonably accurately to the very similar Polyides rotundus. For this reason, it has not been considered necessary to assess each of the 2 algal species separately and only Furcellaria lumbricalis has been used in the biotope sensitivity assessments.
Urticina felina is a species useful to consider when assessing the sensitivity of the fauna in the biotope and is therefore categorised as "important other".

Additional information


This review can be cited as follows:

Rayment, W.J. 2002. Polyides rotundus, Ahnfeltia plicata and Chondrus crispus on sand-covered infralittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 22/12/2014]. Available from: <http://www.marlin.ac.uk/habitatreproduction.php?habitatid=222&code=1997>