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Ibis

Vol. 140, No. 2. April 1998

MAIN PAPERS

PEETER HORAK & JEAN-DOMINIQUE LEBRETON
Survival of adult Great Tits Parus major in relation to sex and habitat; a comparison of urban and rural populations

SABINE G. GEBHARDT-HENRICH, PHILIPP HEEB, HEINZ RICHNER & FRIDIRIC TRIPET
Does loss of mass during breeding correlate with reproductive success? A study on Blue Tits Parus caeruleus

ESA HUHTA, JUKKA JOKIM?KI & PEKKA RAHKO
Distribution and reproductive success of the Pied Flycatcher Ficedula hypoleuca in relation to forest patch size and vegetation characteristics; the effect of scale

IDO IZHAKI & ASAF MAITAV
Blackcaps Sylvia atricapilla stopping over at the desert edge; physiological state and flight-range estimates

IDO IZHAKI & ASAF MAITAV
Blackcaps Sylvia atricapilla stopping over at the desert edge; inter- and intra-sexual differences in spring and autumn migration

IAN JOHNSTONE
Territory structure of the Robin Erithacus rubecula outside the breeding season

GUILLERMO BLANCO, JUAN A. FARGALLO, JEScS A. CUEVAS & JOSE L. TELLA
Effects of nest-site availability and distribution on density-dependent clutch size and laying date in the Chough Pyrrhocorax pyrrhocorax

NGUYIN QUANG PHACH & JEAN-FRANCOIS VOISIN
Influence of cave structure, microclimate and nest harvesting on the breeding of the White-nest Swiftlet Collocalia fuciphaga germani in ViLtnam

MICHAEL S. ROY, JUAN CARLOS TORRES-MURA & FRITZ HERTEL
Evolution and history of hummingbirds (Aves: Trochilidae) from the Juan Fernandez Islands, Chile

K. P. BROWN, H. MOLLER, J. INNES, & P. JANSEN
Identifying predators at nests of small birds in a New Zealand forest

J. R. SPEAKMAN & D. BANKS
The function of flight formations in Greylag Geese Anser anser; energy saving or orientation?

A. TOWNSEND PETERSON, ADOLFO G. NAVARRO-SIGgENZA & HESIQUIO BENQTEZ-DQAZ
The need for continued scientific collecting; a geographic analysis of Mexican bird specimens

D. J. HALLEY & J. O. GJERSHAUG
Inter- and intra-specific dominance relationships and feeding behaviour of Golden Eagles Aquila chrysaetos and Sea Eagles Haliaeetus albicilla at carcasses

J. T. GARCQA, J. VINUELA & C. SUNYER
Geographic variation of the winter diet of Red Kite Milvus milvus in the Iberian Peninsula

M. P. HARRIS, S. WANLESS & D. A. ELSTON
Age-related effects of a nonbreeding event and a winter wreck on the survival of Shags Phalacrocorax aristotelis

N. D. COBLEY, J. P. CROXALL & P. A. PRINCE
Individual quality and reproductive performance in the Grey-headed Albatross Diomedea chrysostoma

LEO W. BRUINZEEL & THEUNIS PIERSMA
Cost reduction in the cold: heat generated by terrestrial locomotion partly substitutes thermoregulation costs in Knot Calidris canutus

SHORT COMMUNICATIONS

P. M. SAGAR & D. S. HORNING, JR
Mass-related survival of fledgling Sooty Shearwaters Puffinus griseus at The Snares, New Zealand

ROBERTO CARBONELL AND JOSI LUIS TELLERQA
Increasing asymmetry of tarsus-length in three populations of Blackcaps Sylvia atricapilla as related to proximity to range boundary

PHILIPPE PROVENCAL & UFFE GJOL SORENSEN
Medieval record of the Siberian White Crane Grus leucogeranus in Egypt

NOBUKIKO KOTAKA
Classical polyandry in the Great Spotted Woodpecker Dendrocopos major

P. ELLIS, N. RATCLIFFE & D. SUDDABY
Seasonal variation in diurnal attendance and response to playback by Leach's Petrels Oceanodroma leucorhoa on Gruney, Shetland

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