Changes in summer numbers of adult Corn Buntings Emberiza calandra in a large sample of study areas holding discrete localized populations were measured. Singing cocks and hens paired with them were counted in early summer at 30 study areas on farmland from south Angus to central Aberdeenshire. Although 22 study areas held birds in 1989 and 25 in 1990, this fell to 10 in 1999, seven in 2005, and four in 2007 (the only areas that held birds in all years). On all areas combined, cock numbers fell by 83% between 1989 and 2007.
Source:
Adam Watson, Allan J. Perkins, Hywel E. Maggs & Jeremy D. Wilson (2009) Bird Study 56: 213-220
http://www.tandfonline.com/doi/abs/10.1080/00063650902792072
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