Birds of Indian Subcontinent

Changing Winter Distribution and Abundance of the Blue Jay, 1962-1971

Publication Type:Journal Article
Year of Publication:1976
Authors:Bock, CE, Lepthien, LW
Journal:American Midland Naturalist
Date Published:1976
ISBN Number:00030031
Keywords:Corvidae, Cyanocitta, Cyanocitta cristata, Garrulus, Garrulus glandarius
Abstract:Audubon Society Christmas count data indicate that between 1962 and 1971 the North American blue jay population (Cyanocitta cristata) increased about 30%, and that migration of this species declined. The most likely cause was the increase in winter feeding by man. Results of this study suggest that winter food supplies and overwinter survival are (or, at least, were) limiting to northern blue jay populations.
Short Title:American Midland Naturalist
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