1 result for 'IR.HIR.KSed.XKScrR'
IR.HIR.KSed.XKScrR Mixed kelps with scour-tolerant and opportunistic foliose red seaweeds on scoured or sand-covered infralittoral rock
Bedrock and boulders, often in tide-swept areas, that are subject to scouring or periodic burial by sand, characterised by a canopy of mixed kelps such as Saccharina latissima, Laminaria hyperborea and Saccorhiza polyschides and the brown seaweed Desmarestia aculeata; there may also be an understorey of foliose seaweeds that can withstand scour such as Plocamium cartilagineum, Chondrus crispus, Dilsea carnosa, Metacallophyllis laciniata as well as the filamentous Heterosiphonia plumosa and the foliose brown seaweed Dictyota dichotoma. The perennial red seaweed Vertebrata byssoides re-grows in the summer months. The L. hyperborea stipes often support a growth of epiphytes, such as Delesseria sanguinea, Phycodrys rubens and Cryptopleura ramosa. The scour can reduce the rock surface to bare coralline crusts at times; sponge crusts and the colonial ascidian Botryllus schlosseri can also grow on the stipes and holdfasts. The faunal diversity on the rock is usually low and restricted to robust, low-profile animals such as the tube-building polychaete Spirobranchus triqueter, the barnacle Balanus crenatus, encrusting bryozoans such as Membranipora membranacea, the anthozoan Urticina felina, the starfish Asterias rubens and the urchin Echinus esculentus. Deeper sites support more hydroids and bryozoans, particularly Bugula spp. Where this biotope occurs in very shallow water Laminaria digitata may be found in combination with the other kelp species. Other species present only in shallow water include the red algae Corallina officinalis and the sand-binding alga Rhodothamniella floridula.