2019
DOI: 10.1002/ece3.5447
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Feather steroid hormone concentrations in relation to age, sex, and molting time in a long‐distance migratory passerine

Abstract: In birds, concentrations of testosterone (T) and corticosterone (Cort) are closely connected with many morphological, behavioral, and other physiological traits, including reproduction, metabolism, immunity, and fitness. The direction of the effect of these hormones on above‐mentioned traits, and the potential feedback between hormones are in general unclear; in addition, knowledge on how age and sex can affect T and Cort concentrations is still inconsistent. Our study used a novel method to analyze testostero… Show more

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Cited by 11 publications
(13 citation statements)
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“…Similarly, in longed-lived common terns ( Sterna hirundo), male plasma T levels first sharply increased and reached a peak at maturity (2-5 years), the started to moderately decrease with age (Nisbet et al, 1999). An analogous trend suggesting the effects of hormonal senescence was also described for feather T levels in barn swallows (Adámková et al 2019). These results are in contrast with most other avian studies (none using a longitudinal design), which have not detected any age-related changes in male T levels.…”
Section: Discussionsupporting
confidence: 70%
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“…Similarly, in longed-lived common terns ( Sterna hirundo), male plasma T levels first sharply increased and reached a peak at maturity (2-5 years), the started to moderately decrease with age (Nisbet et al, 1999). An analogous trend suggesting the effects of hormonal senescence was also described for feather T levels in barn swallows (Adámková et al 2019). These results are in contrast with most other avian studies (none using a longitudinal design), which have not detected any age-related changes in male T levels.…”
Section: Discussionsupporting
confidence: 70%
“…While physiologically important (Goymann & Wingfield, 2014), no longitudinal study has yet examined whether female T undergoes age-related changes through ontogeny in birds. Recently, female T levels have been shown to decline with age in two passerines, the pied flycatcher ( Ficedula hypoleuca; Moreno et al 2014) and the barn swallow (Adámková et al, 2019) both using cross-sectional data. In contrast, in our study female plasma T levels remained stable during their lifetime.…”
Section: Discussionmentioning
confidence: 99%
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“…In our previous laboratory research on the methodological validation of using a bead beater (BB) and surgical scissors (SS) in the hair of Hanwoo cattle, revealed the importance of hair processing method in obtaining constant and reliable hair cortisol [18]. Equally, some literature indicated methods of pulverizing feather into a powder or finely chopping the feather into small pieces for extraction of corticosterone include a) using the SS [4,17], b) the ball mill [9,19,20], and c) the BB [9]. Each of these processing methods has claimed to have some limitations of using, such as long processing time for chopping into small pieces or pulverization of feathers, and homogenization [9,21] that could possibly confound interpretation of the result.…”
Section: Introductionmentioning
confidence: 99%