Intertidal Monitoring of Muddy gravels (LMX.Psyllid) in Menai Strait and Conwy Bay Special Area of Conservation (SAC) 2004 dataset https://portal.medin.org.uk/portal/start.php?tpc=007_NRW_DS101896 Muddy gravels consist of shores of mixed sediments ranging from muds with gravel and sand components to mixed sediments with pebbles, gravels, sands and mud in even proportions. Mixed sediments which are predominantly muddy tend to support infauna similar to mud and sandy mud shores. Although sheltered muddy gravel habitats occur principally in estuaries, rias and sea lochs in areas protected from wave action and strong tidal streams, the environmental conditions of the Menai Strait are unusual, in that the water is relatively turbid and although the area is largely sheltered from wave action it experiences extremely strong tidal currents, reaching up to 8 knots in places during spring tides. The muddy gravel LMX.Psyllid biotope has been mapped along the west side of the Menai Straits, with the mixed sediment shores between Beaumaris and Lleiniog being highly productive, rich in animal and plant species. The muddy gravel LMX.Psyllid contains an unusually high number of syllid polychaetes and form a nationally important biotope, uncommon within the UK. The aim of this data capture was to identify the boundary of muddy gravel and muddy gravel with canopy of tideswept Fucus serratus. - To determine what exactly constitutes the boundary of muddy gravel - To measure the extent of the muddy gravel biotope - To determine a physical damage index for muddy gravels - To take samples at old and recently impacted areas of muddy gravel. - To characterise the infaunal community and identify the degree and type of change using previous data. 20041231