Testosterone Increase in Free-Living Young Blackcaps Sylvia atricapilla and Wood Warblers Phylloscopus sibilatrix During Post-Juvenile Molt with Possible Implications for Juvenile Dispersal

IF 0.8 4区 生物学 Q3 ORNITHOLOGY Acta Ornithologica Pub Date : 2021-03-19 DOI:10.3161/00016454AO2020.55.2.002
M. Goretskaia, Eldar Rakhimberdiev, S. Naidenko, V. Moskalenko, E. Veselovskaya, V. Gavrilov, E. Vostretsova, I. Beme
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Abstract

Abstract. Testosterone may affect many aspects of passerine maturation including the expression of plumage coloration and spring migration in adult birds. However, how the testosterone level changes during bird development is not well known. We compared the testosterone profile during juvenile development of a sexually dimorphic species, the Blackcap Sylvia atricapilla, and a monomorphic species, the Wood Warbler Phylloscopus sibilatrix. We first tested whether testosterone influences plumage coloration and increases at the onset of molt in males of the dimorphic but not the monomorphic species. We found that a testosterone level increase occurred in both sexes and species during later stages of molt, and thus was not related to male plumage coloration. We also investigated whether the increase in testosterone level coincides with juvenile dispersal. If testosterone affects dispersal behavior in these species, both sexes should show an elevated testosterone level during dispersal, but this increase should occur earlier in the Wood Warbler, which disperses earlier than the Blackcap. In juvenile Blackcaps, the increase in testosterone level occurred on the 43–68th day after hatching, while in Wood Warblers it occurred on the 32–36th day (i.e. 11–32 days earlier). The increase in testosterone level coincided with the onset of the post-juvenile dispersal in both species. This study provides the first direct evidence of a testosterone level increase during juvenile development in two free-living migratory birds. While not correlated with species plumage coloration, this increase might affect other aspects of behavior, e.g. juvenile dispersal.
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幼年后蜕皮过程中自由生活的小黑帽Sylvia atricapilla和Wood Warblers Phylloscopus sibilatrix的睾酮增加可能对幼年分散有影响
摘要睾酮可能影响雀形目成熟的许多方面,包括成年鸟类羽毛颜色的表达和春季迁徙。然而,鸟类发育过程中睾酮水平的变化尚不清楚。我们比较了性二型物种黑冠Sylvia atricapilla和单型物种Wood Warbler Phylloscopus sibilatrix在幼年发育过程中的睾酮水平。我们首先测试了睾酮是否会影响二形态而非单形态物种雄性的羽毛颜色,并在蜕皮开始时增加。我们发现,在蜕皮的后期,性别和物种的睾酮水平都会增加,因此与雄性羽毛的颜色无关。我们还调查了睾酮水平的增加是否与青少年的扩散相一致。如果睾酮影响这些物种的传播行为,那么在传播过程中,两性的睾酮水平都应该升高,但这种增加应该发生在比黑帽莺更早传播的木莺身上。在幼年黑帽鹬中,睾酮水平的增加发生在孵化后的第43–68天,而在Wood Warblers中,则发生在第32–36天(即提前11–32天)。睾酮水平的增加与这两个物种幼年后扩散的开始相吻合。这项研究首次提供了两种自由生活候鸟在幼年发育过程中睾酮水平升高的直接证据。虽然与物种的羽毛颜色无关,但这种增加可能会影响行为的其他方面,例如幼年的传播。
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来源期刊
Acta Ornithologica
Acta Ornithologica 生物-鸟类学
CiteScore
2.10
自引率
0.00%
发文量
14
审稿时长
>12 weeks
期刊介绍: Publishes scientific papers (original research reports, reviews, short notes, etc.) and announcements from all fields of ornithology. All manuscripts are peer-reviewed. Established in 1933 as Acta Ornithologica Musei Zoologici Polonici, since 1953 continued under the present title. Published twice a year by the Natura Optima Dux Foundation under the auspices of the Museum and Institute of Zoology, Polish Academy of Sciences.
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