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Barren or amphipod-dominated mobile sand shores

Description of Barren or amphipod-dominated mobile sand shores

Identity:

flag A2.22
creatorIdentity remo
creationTime 2017-08-16T16:38:13.041
lastMaintainerIdentity remo
modificationTime 2016-03-16T18:42:49
id 2772
imageSize 0 Bytes

Shores consisting of clean mobile sands (coarse, medium and some fine-grained), with little very fine sand, and no mud present. Shells and stones may occasionally be present on the surface. The sand may be duned or rippled as a result of wave action or tidal currents. The sands are non-cohesive, with low water retention, and thus subject to drying out between tides, especially on the upper shore and where the shore profile is steep. Most of these shores support a limited range of species, ranging from barren, highly mobile sands to more stable clean sands supporting communities of isopods, amphipods and a limited range of polychaetes. Species which can characterise mobile sand communities include Scolelepis squamata, Pontocrates arenarius, Bathyporeia pelagica, B. pilosa, Haustorius arenarius and Eurydice pulchra. Situation: Mobile sand shores are typically situated along open stretches of coastline, with a relatively high degree of wave exposure. Bands of gravel and shingle may be present on the upper shore of exposed beaches. Where the wave exposure is less, and the shore profile more shallow, mobile sand communities may also be present on the upper part of the shore, with more stable fine sand communities present lower down. A strandline of talitrid amphipods (A2.211) typically develops at the top of the shore where decaying seaweed accumulates. Temporal variation: Mobile sand shores may show significant seasonal changes, with sediment accretion during calm summer periods and beach erosion during more stormy winter months. There may be a change in sediment particle size structure, with finer sediment grains washed out during winter months, leaving behind coarser sediments.