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Titolo:
Plasma corticosterone in nestling American kestrels: Effects of age, handling stress, yolk androgens, and body condition
Autore:
Sockman, KW; Schwabl, H;
Indirizzi:
Washington State Univ, Ctr Reprod Biol, Sch Biol Sci, Pullman, WA 99164 USA Washington State Univ Pullman WA USA 99164 iol Sci, Pullman, WA 99164 USA
Titolo Testata:
GENERAL AND COMPARATIVE ENDOCRINOLOGY
fascicolo: 2, volume: 122, anno: 2001,
pagine: 205 - 212
SICI:
0016-6480(200105)122:2<205:PCINAK>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
ADRENOCORTICAL-RESPONSE; MATERNAL TESTOSTERONE; BIRDS; MIGRATION; BEHAVIOR; CHICKS; GROWTH;
Keywords:
avian growth; development; Falco sparverius; glucocorticosteroids; hypothalamic-pituitary-adrenal (HPA) axis; maternal effects; sibling competition; stress response;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
29
Recensione:
Indirizzi per estratti:
Indirizzo: Sockman, KW Johns Hopkins Univ, Dept Psychol, Baltimore, MD 21218 USA Johns Hopkins Univ Baltimore MD USA 21218 imore, MD 21218 USA
Citazione:
K.W. Sockman e H. Schwabl, "Plasma corticosterone in nestling American kestrels: Effects of age, handling stress, yolk androgens, and body condition", GEN C ENDOC, 122(2), 2001, pp. 205-212

Abstract

The effects of age, handling-induced stress, yolk androgens, and body condition on plasma corticosterone levels were investigated in free-living nestling American kestrels, Falco sparverius, a semialtricial falcon species. In an observational study, corticosterone levels varied with age and handling time. Specifically, corticosterone was low until age 15 days and then rose from age 20 through 25 days. Nestlings as young as age 10 days showed a handling-induced rise in corticosterone. Neither sex nor hatching order of the nestling affected corticosterone levels. Concentrations of maternally derived yolk androgens have previously been shown to be lower in first-laid than in later-laid eggs in the clutch. In an experimental study, androgens were injected into the yolk of the first-laid egg to elevate its levels to those of later-laid eggs, a treatment that substantially reduces nestling body condition compared with that of controls. Yolk androgen treatment elevated posthatching corticosterone levels compared with those of controls, and corticosterone levels were negatively correlated with body condition. Thesefindings indicate that even very young, developing birds can show stress-induced increases in corticosterone and that age-related changes in corticosterone secretion may be modified by body condition and maternal effects such as yolk androgen deposition. The short- and long-term consequences of high glucocorticosteroid levels in young, developing vertebrates are largely unknown. (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 00:34:20