Intertidal Monitoring of Sabellaria alveolata Reefs in Pen Llyn a'r Sarnau Special Area of Conservation (SAC) 2012 dataset https://portal.medin.org.uk/portal/start.php?tpc=007_NRW_DS115332 Pen Llyn a'r Sarnau Special Area of Conservation (SAC) is designated for five Annex 1 habitats and four subsidiary ones, listed in Table 1. Of these, Estuaries and their constituent mudflats, sandflats and reefs, large shallow inlets and bays with intertidal Zostera beds, populations of the shingle-dwelling amphipod Pectenogammarus, piddocks in clay and lower shore boulder communities and Reefs, particularly biogenic reefs of Sabellaria alveolata; are the main habitats of interest within the intertidal areas of the SAC. Conservation objectives for these habitats are given in the Regulation 33 advice for the SAC (CCW 2009). The purpose of this data capture was to continue monitoring the intertidal area within the SAC. 20120731