Influences causing fluctuation of warbler population in cultivated lands and oak Woods in the Severn Valley
01 November 1950
IN November, 1935 (antea, vol. xxix, pp. 158-166), I published Notes on Population Problems and Territorial Habits of Chiffchaffs and Willow-Warblers." This was the result of observations over the years 1927 to 1935 in one area oi farm land and another of...