rivers have been designated as SSSIs because they are of special interest primarily for important populations of otter Lutra lutra, bullhead Cottus gobio, river lamprey Lampetra fluviatilis and brook lamprey Lampetra planeri. They are also of special interest for sea lamprey Petromyzon marinus; for the range of river habitats including beds of submerged aquatic plants often dominated by water-crowfoot Ranunculus spp., as well as a variety of associated riverside habitats. The Cleddau rivers are also a Special Area of Conservation designated for the European bullhead (Cottus gobio), European river lamprey (Lampetra fluviatilis), Brook lamprey (Lampetra planeri), Otter (Lutra lutra), Sea lamprey (Petromyzon marinus); rivers with floating vegetation often dominated by water-crowfoot (watercourses of plain to montane levels with the Ranunculion fluitantis and Callitricho-Batrachionvegetation); active raised bogs; and Alder woodlands on floodplains (Alluvial forests with Alnus glutinosa and Fraxinus excelsior (Alno-Padion, Alnion incanae, Salicion albae)). Additionally, land around a north-eastern tributary of the Eastern Cleddau, Gweunydd Blaencleddau, is designated as a Special Area of Conservation for habitats including: calcium-rich springwater-fed fens - Alkaline fens; the southern damselfly (Coenagrion mercuriale), marsh fritillary butterfly Euphydryas (Eurodryas, Hypodryas) aurinia; purple moor-grass meadows - molinia meadows on calcareous, peaty or clayey-silt-laden soils (Molinion caeruleae); wet heathland with cross-leaved heath Rhostiroedd gwlyb – Northern Atlantic wet heaths with Erica tetralix; very wet mires often identified by an unstable 'quaking' surface – transition mires and quaking bogs; and blanket bogs. See also Dungleddy, an ancient hundred whose name continues in the present day as Daugleddau Notes External links SSSI & SAC links from Natural Resources Wales NRW Designated Sites search page - tens of maps - search for 'Cleddau' Afon Cleddau Dwyreiniol / Eastern Cleddau River SSSI Citation SSI Management Statement Afon Cleddau Gorllewinol / Western Cleddau River SSSI Citation SSSI Management Statement Afonydd Cleddau / Cleddau Rivers SAC Entry Large-scale SAC map Gweunydd Blaencleddau SAC Entry SAC map DEFRA's MAGIC Map Afon Cleddau Dwyreiniol / Eastern Cleddau River SSSI map Afon Cleddau Gorllewinol / Western Cleddau River SSSI map Cleddau Sites of Special Scientific Interest in Pembrokeshire Sites of Special Scientific Interest in Carmarthen & Dinefwr