The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.
Range & Status
Old World; in Britain and Ireland there are 9000 birds in the breeding season, with 19,000 in winter.
Cornwall: very small numbers winter on most large estuaries, but only the Lynher is of significance (1225), 13 pairs have regularly nested since 1985 on reservoirs (chiefly Lower Tamar Lake, Crowdy, Colliford and Siblyback). A rare visitor, not annual, in the Isles of Scilly.
Habitat & Ecology
Breeds by large pools and lakes with fringe and emergent vegetation.
Protection, coupled with creation of flooded gravel pits and new reservoirs, has permitted drastic increase in Britain over past 40 years. Gradual establishment and
spread of new Cornish population should be expected.
I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.
The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.