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Marine Habitat Classification


2 results for 'LR.FLR.Rkp.FK'

   LR.FLR.Rkp.FK  Fucoids and kelp in deep eulittoral rockpools

Deep or larger rockpools in the mid to lower eulittoral zone on exposed to moderately exposed shores characterised by the wrack Fucus serratus and the kelp Laminaria digitata and the red seaweed Corallina officinalis while encrusting coralline algae cover the rock surface. Other large brown seaweeds, including the kelp Saccharina latissima and Halidrys siliquosa may also occur. A wide variety of filamentous and foliose seaweeds occur beneath the brown algal canopy. The species includes the red seaweeds Palmaria palmata, Chondrus crispus, Mastocarpus stellatus, Ceramium nodulosum and Dumontia contorta, but green seaweeds such as Ulva intestinalis, Ulva lactuca and Cladophora rupestris can be present as well. Algal-free vertical and overhanging faces often support the sponge Halichondria panicea and anemones including Actinia equina and Urticina felina. Grazing molluscs including the limpet Patella vulgata, the top shell Steromphala cineraria and the winkle Littorina littorea are present on the rock surface while the mussel Mytilus edulis can be found in cracks and crevices. The whelk Nucella lapillus can be found preying on the mussels. Where boulders occur in these pools they provide a greater variety of micro-habitats which support a variety of fauna. Mobile crustaceans including the crabs Pagurus bernhardus and Carcinus maenas, brittlestars such as Ophiothrix fragilis and Amphipholis squamata, encrusting bryozoans and ascidians are typically found beneath and between boulders.

   LR.FLR.Rkp.FK.Sar  Sargassum muticum in eulittoral rockpools

Shallow rockpools throughout the eulittoral zone on exposed to moderately exposed shores dominated by the brown seaweed Sargassum muticum and the red seaweed Corallina officinalis. Other brown seaweeds, including the kelp Saccharina latissima, Laminaria digitata and the wrack Fucus serratus may occur along with Dictyota dichotoma, but S. muticum always dominates. Underneath the canopy is a rich red seaweed community which includes both foliose and filamentous species such as Palmaria palmata, Chondrus crispus, Lomentaria articulata, Osmundea pinnatifida, Ceramium spp. and Dumontia contorta. Encrusting coralline algae and Hildenbrandia rubra often cover the rock surface. The foliose green seaweed Ulva lactuca is usually present in high abundance growing on the mobile gravel and boulders on the bottom of the rockpools, often along with other ephemeral green seaweeds such as Cladophora rupestris and Ulva intestinalis. The winkle Littorina littorea, the limpet Patella vulgata and the top shells Steromphala cineraria and Steromphala umbilicalis can often be found grazing on the biofilm of the rock surface or the seaweeds. Crevices and fissures in the rock provide cover for anemones such as Actinia equina and Anemonia viridis, cover while the prawn Palaemon serratus often can be found in large numbers hiding underneath the seaweed canopy or along the boulders on the bottom. Some sand scour can affect these rockpools.
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