We wish to dedicate this paper to the memory of Professor A. J. Marshall whose untimely death occurred while it was in press. Professor Marshall was formerly the head of the Department of Zoology, St. Bartholomew's Hospital Medical College, London, and subsequently held the Foundation Chair of Zoology and Comparative Physiology, Monash University, Australia. Probably the most valuable of his many contributions to the field of avian physiology was his ability to relate laboratory experimentation to the natural environment. Much of the thought contained in the present paper has been stimulated by his approach and pioneer studies.

No abstract

Summary The feeding‐sites of Woodpigeon, Stock Dove and Turtle Dove were examined in a study area in Cambridgeshire by making repeated standardized observations over five years. The crop contents of 614 Woodpigeons and 166 Stock Doves shot throughout the period were analysed to determine the birds' diet. Seasonal variations are detailed. The crop contents of 41 Turtle Doves, and the nestlings of 14 Stock Doves and 5 Turtle Doves were also analysed. During the winter, Woodpigeons fed primarily on clover leaves which they collected from leys and pastures, but also on weed leaves and, during periods of snow, those of various cultivated brassicae. Grain was taken from the spring cereal sowings, after which the birds reverted to clover feeding, supplementing this diet with tree leaf and flower buds. When cereals ripened these comprised the main food being collected from July to November, at first from standing crops and then from stubbles. Wheat was preferred to barley. In the autumn, beech nuts, acorns and other tree fruits were taken and when stocks of these and the cereals were exhausted the birds turned again to clover feeding. Weed seeds, especially pasture species, were collected especially in May and June but only in small amounts. Stock Doves fed primarily on weed seeds throughout the year, obtaining these from fallow ground, ploughed fields and cereal stubbles. Cereal seed was taken when available, but featured less in its diet than that of the Woodpigeon. The most important weed seeds were Sinapsis and Brassica species, Stellaria media capsules and Polygonum and Chenapodium species. Leaves or tree buds and fruits were not an important food item. Turtle Doves fed primarily on the seeds of Fumaria and grass species, but they also collected cereal grains and Stellaria media capsules. They collected their food from waste ground or from tall, standing hay or corn crops, where many weeds were growing. They did not appear to feed from trees or hedgerows. The food of nestling Stock and Turtle Doves was similar to that collected by the adults for themselves. The feeding habits of the other British columbids is briefly reviewed. It appears that the Turtle Dove, Stock Dove and Woodpigeon, and also the feral pigeon and Collared Dove occupy different ecological niches, the first three associated with arable farmland. The Woodpigeon, Stock Dove and Turtle Dove have all increased in numbers and range following the development of agriculture. It is likely that the Rock Dove competes for food with the Stock Dove and possibly at times with the Woodpigeon, which probably explains the declining status of the Rock Dove in Britain. The distribution of the Turtle Dove in Britain is similar to the distribution of Fumitory, its major food plant.

No abstract