Volunteer Diver Seagrass Zostera marina Surveys, Llyn Peninsula and Milford Haven (2008) dataset https://portal.medin.org.uk/portal/start.php?tpc=007_NRW_DS110284 In areas where conditions are suitable seagrass beds form and these are considered nationally important in the UK. Seagrasses are thought to help stabilising the seabed in addition to providing organic matter, shelter and food for a variety of fish, birds and invertebrates. Seagrass beds are vital nursery grounds for flatfish, and in some areas also for cephalopods. They are also known to be sensitive to changes in water quality and human disturbance. Seagrass beds have been designated as a UK Biodiversity Action Plan Habitat (underpinned by the Convention of Biological Diversity, Rio Earth Summit 1992), and as a Habitat of Principal Importance for the Conservation of Biological Diversity in Wales (NERC Act 2006: Section 42). The survey was due to be expanded in 2009 to other areas within the Pen Llyn a'r Sarnau Special Area of Conservation (SAC) and methodologies refined. 1. Develop methods to look at damage to seagrass beds caused by anchor chains compared to permanent moorings. 2. 'Ground-truth' aerial photographs of Porth Dinllaen and Milford Haven subtidal seagrass beds. 3. Test methods of measuring extent of large seagrass beds using volunteers. 4. Estimate density and measure depth of live seagrass in different parts of the bed. 5. Make note of any unusual feature of the seagrass bed. 20081231