Corticosterone in feathers is a long-term, integrated measure of avian stress physiology

By G. Bortolotti, T. Marchant, Julio Blas, T. German. 2008

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A meta-analysis of the effects of geolocator application on birds (2013, background): “A second approach would rely on the fact that corticosterone is deposited in feathers during molt (Bortolotti et al., 2008), and that the use of a tracking device might permanently increase the level of circulating corticosterone (see Supplementary Material), if an individual was stressed by the…”
Corticosterone: effects on feather quality and deposition into feathers (2015, neutral): “However, only few validation studies of hormone analysis in feathers have been published (Bortolotti et al. 2008, 2009; Lattin et al. 2011; H~orak et al. 2013).”
Measuring stress in wildlife: techniques for quantifying glucocorticoids (2011, methodology): “Most studies have been correlational studies or have contrasted GC levels in individuals with different behaviours (Koren et al. 2002, 2008; Bortolotti et al. 2008; Martin and Réale 2008).”
Concentration of fecal cortisol metabolites in chamois in relation to tourist pressure in Tatra National Park (South Poland) (2013, background): “…of stress hormone metabolites in fecal, feather, or hair samples have been proven to accurately reflect the levels of these hormones in the plasma (Bortolotti et al. 2008; MacBeth et al. 2010; Sheriff et al. 2010) and are becoming more popular in conservation (see reviews byWikelski and Cooke…”