|Basic Information||Biotope classification||Ecology||Habitat preferences and distribution||Species composition||Sensitivity||Importance|
Image Rohan Holt - Bugula spp. and other bryozoans on vertical moderately exposed circalittoral rock Image width ca XX m.
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CR.C.FaV.Bug recorded () and expected () distribution in Britain and Ireland (see below)
Temperature range preferences - Data deficient
Water clarity preferences - High clarity / Low turbidity
Medium clarity / Medium turbidity
Low clarity / High turbidity
Limiting Nutrients - Data deficient
Other preferences - Steep, vertical or overhanging hard substrata.
The abundance of bryozoans is positively correlated with supply of stable hard substrata and hence with current strength (Eggleston, 1972b; Ryland, 1976). The community stability and diversity also requires stable substrata (Osman, 1977; Dyrynda, 1994). Water movement is essential for suspension feeders such as hydroids, bryozoans, sponges, amphipods and ascidians to supply adequate food, remove metabolic waste products, prevent accumulation of sediment and disperse larvae or medusae. Animal communities tend to dominate steep, vertical or overhanging surfaces, while macroalgae tend to dominate horizontal or gently sloping surfaces (< 60°) (Hartnoll, 1983). Steep or vertical surfaces reduce incident light, reduce siltation and may prevent settlement by algal spores, which tend to roll down hill (see Norton, 1992, Hartnoll, 1983). Species composition varies with depth, with decreasing numbers of foliose or filamentous algae due to light attenuation, and increasing numbers of species adapted to unidirectional flow (e.g. planar species of hydroids) than oscillatory flow as the effects of wave action attenuate (Riedl, 1971; Hiscock, 1983).
This review can be cited as follows:
Tyler-Walters, H. 2002. Bugula spp. and other bryozoans on vertical moderately exposed circalittoral rock. Marine Life Information Network: Biology and Sensitivity Key Information Sub-programme [on-line]. Plymouth: Marine Biological Association of the United Kingdom. [cited 25/05/2013]. Available from: <http://www.marlin.ac.uk/habitatpreferences.php?habitatid=105&code=1997>