期刊
SCIENCE OF NATURE
卷 103, 期 1-2, 页码 -出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s00114-015-1328-x
关键词
Collared flycatcher; 2D:4D; Digit ratio; Prenatal testosterone; Testosterone; Manipulation
资金
- Hungarian Scientific Research Fund (OTKA) [T049650, K75618]
- Eotvos Lorand University
- Hungarian State PhD Scholarship
- Erdok a Kozjoert Alapitvany
- Pilis Park Forestry
Second-to-fourth digit ratio is a widely investigated sexually dimorphic morphological trait in human studies and could reliably indicate the prenatal steroid environment. Conducting manipulative experiments to test this hypothesis comes up against ethical limits in humans. However, oviparous tetrapods may be excellent models to experimentally investigate the effects of prenatal steroids on offspring secondto-fourth digit ratio. In this field study, we injected collared flycatcher (Ficedula albicollis) eggs with physiological doses of testosterone. Fledglings from eggs with elevated yolk testosterone, regardless of their sex, had longer second digits on their left feet than controls, while the fourth digit did not differ between groups. Therefore, second-to-fourth digit ratio was higher in the testosterone-injected group, but only on the left foot. This is the first study which shows experimentally that early testosterone exposure can affect second-to-fourth digit ratio in a wild population of a passerine bird.
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