Bird numbers in relation to grazing on a grouse moor from 1957-61 and 1988-98

Birds were counted before and after heavy grazing on a Scottish grouse moor Oystercatchers Haematopus ostralegus, Lapwings Vanellus vanellus and Curlews Numenius arquata increased where high sheep stocks anti grass seeding converted much ling Calluna vulgaris to smooth grass, but not where heath remained. A heathy part that held many gamebirds in 1957-61 but later became short grass had no Red Grouse Lagopus lagopus scoticus, Black Grouse Tetrao tetrix or Grey Partridge Perdix perdix in 1989-98. The study area held many Golden Plover Pluvialis apricaria in 1957-61 but none in 1988-98.