Biodiversity & Conservation

Flustra foliacea and other hydroid/bryozoan turf species on slightly scoured circalittoral rock or mixed substrata

CR.HCR.XFa.FluCoAs


MCR.Flu

Image David Connor - Flustra foliacea and other hydroid/bryozoan turf species on slightly scoured circalittoral rock or mixed substrata. Image width ca 10 cm.
Image copyright information

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Distribution map

CR.HCR.XFa.FluCoAs recorded (dark blue bullet) and expected (light blue bullet) distribution in Britain and Ireland (see below)


  • EC_Habitats

Recorded distribution in Britain and Ireland

Present around the coast of Britain but absent from the north west and north east of Scotland and the south east of England. Recorded in several locations around the coast of Ireland.

Habitat preferences

Temperature range preferences - Data deficient

Water clarity preferences - Medium clarity / Medium turbidity
Low clarity / High turbidity
Poor clarity / Extreme turbidity

Limiting Nutrients -

Other preferences - Sediment scour

Additional information

The distribution map includes records of both the MCR.Flu biotope and its sub-biotopes. Flustra foliacea is associated with strong currents and areas subject to sediment abrasion (Stebbing, 1971a; Knight-Jones & Nelson-Smith, 1977; Hartnoll, 1983; Holme & Wilson, 1985) and requires stable hard substrata (Eggleston, 1972b; Ryland, 1976; Dyrynda, 1994). The abundance of bryozoans is positively correlated with supply of stable hard substrata and hence with current strength (Eggleston, 1972b; Ryland, 1976).
This biotope and the species it supports are characteristic of moderate to strong currents, subject to different degrees of sediment scour and silt. The different sub-biotopes differ in the degree of siltation and scour to which they are exposed. For example, MCR.Flu.Flu, is species poor and exposed to high silt levels. Sponges, hydroids and ascidians increase in number with decreasing silt, the sub-biotopes differing in their degree of wave exposure or water flow rates. The distribution of the sub-biotopes is also dependant on their geographic position, e.g. MCR.Flu.Flu predominates on the eastern coast Scotland and England, while MCR.Flu.Hocu is only found in south England (Connor et al, 1997; Hartnoll, 1998).


This review can be cited as follows:

Tyler-Walters, H. 2002. Flustra foliacea and other hydroid/bryozoan turf species on slightly scoured circalittoral rock or mixed substrata. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 25/04/2014]. Available from: <http://www.marlin.ac.uk/habitatpreferences.php?habitatid=267&code=2004>