Bird Study The Journal of the British Trust for Ornithology Edited by David T. Parkin Volume 38 1991 Published by Blackwell Scientific Publications Ltd ©1991 British Trust for Ornithology. Authorization Published for the British Trust for Ornithology by to photocopy items for internal or personal use, or Blackwell Scientific Publications the internal or personal use of specific clients, is Osney Mead, Oxford OX2 OEL granted by the British Trust for Ornithology for 25 John Street, London WC1N 2BL libraries and other users registered with the 23 Ainslie Place, Edinburgh EH3 6AJ Copyright Clearance Center (CCC) Transactional 3 Cambridge Center, Suite 208, Cambridge, Reporting Service, provided that the base fee of Massachusetts 02142, USA $05.00 per copy is paid directly to CCC, 27 Congress 107 Barry Street, Carlton, Victoria 3053, Australia Street, Salem, MA 01970, USA. Special requests Arnette SA, 2, rue Casimir-Delavigne, should be addressed to the Editor. 0006-3657/90 75006 Paris, France $05.00. Blackwell Wissenschaft, Meinekestrasse 4, D-1000 Berlin 15, Germany Blackwell MZV, Feldgasse, A-1238 Wien, Austria Printed in Great Britain by Henry Ling Ltd, at the Dorset Press, Dorchester, Dorset. Contents Volume 38 - Part 1 - March 1991 On the use of greater covert moult and pectoral muscle as measures of condition in passerines with data for the Great Tit Parus major. A.G. Gosler Origins, population structure and movements of Snow Bunting Plectrophenax nivalis wintering in Highland Region, Scotland. K.W. Banks, H. Clark, I.R.K. Mackay, S.G. Mackay and R.M. Sellers The numbers and distribution of Lapwings V. vanellus nesting in England and Wales in 1987. M. Shrubband P.C. Lack Effects of group size and distance to protective cover on the vigilance behaviour of Black-billed Magpies Pica pica. J.A. Diaz and B. Asensio Griffon Vultures Gyps fulvus occupying eyries of other cliff-nesting raptors. C. Fernaéndez and J.A. Dondzar Nest-site selection and nesting success in the Azure-winged Magpie in Central Spain. ].A. Alonso, R. Mufioz-Pulido, L.M. Bautista and J.C. Alonso A review of reports of Buzzard persecution 1975-1989. G.D. Elliott and M.I. Avery Winter bird communities in woodland in the Forest of Dean, England, and some implications of livestock grazing. D.A. Hill, S. Lambton, I. Proctor and I. Bullock Relative abundance of migrants at a stopping-over site and the abundance in their breeding ranges. U.N. Safriel and D. Lavee Volume 38 - Part2 - July 1991 Estimating the nesting success and productivity of British Pheasants Phasianus colchicus from nest-record schemes. P.A. Robertson Counts of male Black Grouse Tetrao tetrix in North Wales. J.T. Cayford and F. Walker Habitat selection in the Dunnock Prunella modularis in northern England A. Bevington The effect of interspecific aggression on territorial dynamics in Acrocephalus Warblers in a marsh area of north-western Italy. A. Rolando and C. Palestrini Some aspects of breeding success of the Osprey Pandion haliaetus in Corsica, Western Mediterranean. J.-C. Thibault and O. Patrimonio Occupation of new conifer plantations by Merlins in Wales. S.J. Parr Roost fidelity of Pink-footed Geese Anser brachyrhynchus in north-east Scotland. ].-F. Giroux Pochard Aythya ferina use of chironomid-rich feeding habitat in winter. V.E. Phillips Inland breeding of Shelduck Tadorna tadorna in Britain. E. Linton and A.D. Fox The distribution and ecology of naturalized Egyptian Geese Alopochen aegyptiacus in Britain. W.J. Sutherland and G. Allport The choice of fishing lakes by the Red-throated Diver Gavia stellata and Black-throated Diver G. arctica during the breeding season in south-west Sweden. M.O.G. Eriksson and P. Sundberg Volume 38 - Part3 - November 1991 Factors affecting the use of feeders by garden birds: I. The positioning of feeders with respect to cover and housing. R.J. Cowie and ].R. Simons Population dynamics of Common Sandpipers Actitis hypoleucos breeding along an upland river system. P.K. Holland and D.W. Yalden Nesting densities, productivity and survival of breeding Whimbrel Numenius phaeopus in Shetland. M.C. Grant Pre-migratory and migratory movements of Swallows Hirundo rustica in Britain and Ireland. S.J. Ormerod A comparison between high water and low water counts of shorebirds on the Wash, east England. M.G. Yates and J.D. Goss-Custard Some aspects of frugivory by bird populations using coastal dune scrub in Lincolnshire. M. Boddy Unspecialized exploitation of small carcasses by birds. F. Hiraldo, J.C. Blanco and J. Bustamante Reviews