Plasma corticosterone in nestling american kestrels: effects of age, handling stress, yolk androgens, and body condition

General and Comparative Endocrinology
K W Sockman, H Schwabl

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. These findings indicate that even very young, developing birds can show stress-induced increases in corticosterone and that age-...Continue Reading

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Citations

Jun 3, 2011·Proceedings. Biological Sciences·Graham D FairhurstGary R Bortolotti
Jan 2, 2014·General and Comparative Endocrinology·Thomas MerklingEtienne Danchin
May 27, 2014·General and Comparative Endocrinology·Alexander BraaschTon G G Groothuis
Apr 28, 2007·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Airica M StaleySteven L Monfort
Apr 30, 2008·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·David CostantiniGiacomo Dell'omo
May 1, 2013·Physiological and Biochemical Zoology : PBZ·Lynn SieffermanGeoffrey E Hill
Jul 12, 2011·Physiological and Biochemical Zoology : PBZ·Julio BlasFernando Hiraldo
May 21, 2011·General and Comparative Endocrinology·Garth Herring, Joshua T Ackerman
Feb 5, 2011·General and Comparative Endocrinology·Michelle A RenselStephan J Schoech
Aug 7, 2010·General and Comparative Endocrinology·Corinne P KozlowskiRobert E Ricklefs
Feb 23, 2010·Hormones and Behavior·Vallo TilgarRaivo Mänd
Dec 23, 2009·General and Comparative Endocrinology·Ricardo José Garcia PereiraJosé Maurício Barbanti Duarte
Nov 26, 2009·General and Comparative Endocrinology·Nanette VerbovenNeil P Evans
Nov 3, 2009·Hormones and Behavior·Michelle A RenselStephan J Schoech
Sep 1, 2009·General and Comparative Endocrinology·Lisa M F EggertKathleen M O'Reilly
Jul 15, 2009·General and Comparative Endocrinology·Michelle A RenselStephan J Schoech
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