Immunity, growth and begging behaviour of nestling Barn Swallows Hirundo rustica in relation to hatching order

Citation
N. Saino et al., Immunity, growth and begging behaviour of nestling Barn Swallows Hirundo rustica in relation to hatching order, J AVIAN BIO, 32(3), 2001, pp. 263-270
Citations number
68
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
JOURNAL OF AVIAN BIOLOGY
ISSN journal
0908-8857 → ACNP
Volume
32
Issue
3
Year of publication
2001
Pages
263 - 270
Database
ISI
SICI code
0908-8857(200109)32:3<263:IGABBO>2.0.ZU;2-W
Abstract
In altricial birds, asynchronous hatching often results in a size hierarchy among nestlings. However, laying order and hatching order may affect compo nents of offspring condition differentially. Since parasites can have a hea vy impact on their hosts, strategies may have evolved that allow parents an d offspring to allocate critical resources to immunity depending on hatchin g order. In this study of the Barn Swallow Hirundo rustica we (1) analyse t he relationship between laying and hatching order of eggs, (2) compare morp hological, serological and immunological traits between early- and late-hat ched siblings, and (3) compare the begging behaviour of early- and late-hat ched nestlings. Hatching order strictly reflected laying order. Late-hatche d chicks begged more for food but had smaller body mass throughout the nest ling period. Immunoglobulin concentration and intensity of T cell-mediated immunity were larger in late-hatched nestlings. Large concentration of immu noglobulins in late-hatched nestlings may reflect transfer of immunity from the mother via the egg. Alternatively, in association with larger T cell-m ediated immunity, immunoglobulin production may indicate larger investment in immunity by late-hatched nestlings. Laying order and hatching order may therefore affect components of nestling condition differentially.