COUNTRYSIDE COUNCIL FOR WALES
SITE OF SPECIAL SCIENTIFIC INTEREST: CITATION
National Grid Reference: SH585771
Site Area: 16.5 ha
This site has been selected for its biological interest.
The water level in Llyn Bodgylched is maintained by an embankment along the western margin and a dam at the southern tip. This shallow basin on Precambrian rock of the Mona complex is overlain by boulder clay with an area of alluvium along the western side.
Much of the open water is covered by common reed Phragmites australis and tall fen vegetation. Yellow flag Iris pseudacorus and greater pond sedge Carex riparia are locally dominant with patches of common club-rush Schoenoplectus lacustris, reed canary-grass Phalaris arundinacea, bulrush Typha latifolia and greater tussock-sedge Carex paniculata. Bottle sedge Carex rostrata and bogbean Menyanthes trifoliata are locally dominant. Lesser water-plantain Baldellia ranunculoides, greater spearwort Ranunculus lingua and lesser tussock-sedge Carex diandra, locally uncommon species, occur within the fen. Areas dominated by purple moor-grass Molinia caerulea are species rich including petty whin Genista anglica and abundant saw-wort Serratula tinctoria. Where base rich springs issue, blunt-flowered rush Juncus subnodulosus is locally abundant with grass of Parnassus Parnassia palustris and marsh helleborine Epipactis palustris.
The breeding bird community is of particular importance including such species as mute swan, tufted duck, shoveler, teal, water rail and reed warbler which regularly breed. Over wintering wildfowl occur in small numbers although this site is of local importance for shoveler. A relict flock of European white fronted geese is of interest, occurring at this locality isolated from the major over wintering grounds in the south.