雄性长颈鹿的雄激素变化与灵活的交配行为。
Androgen changes and flexible rutting behaviour in male giraffes.
机构信息
Department of Medical Genetics, Molecular and Clinical Pharmacology, Medical University Innsbruck, Innsbruck, Austria.
出版信息
Biol Lett. 2013 Aug 7;9(5):20130396. doi: 10.1098/rsbl.2013.0396. Print 2013 Oct 23.
Abstract
The social organization of giraffes (Giraffa camelopardalis) imposes a high-cost reproductive strategy on bulls, which adopt a 'roving male' tactic. Our observations on wild giraffes confirm that bulls indeed have unsynchronized rut-like periods, not unlike another tropical megaherbivore, the elephant, but on a much shorter timescale. We found profound changes in male sexual and social activities at the scale of about two weeks. This so far undescribed rutting behaviour is closely correlated with changes in androgen concentrations and appears to be driven by them. The short time scale of the changes in sexual and social activity may explain why dominance and reproductive status in male giraffe in the field seem to be unstable.
摘要
长颈鹿（Giraffa camelopardalis）的社会组织形式对公牛施加了高成本的生殖策略，公牛采取了“流浪雄性”策略。我们对野生长颈鹿的观察证实，公牛确实存在非同步的发情期，与另一种热带大型草食动物大象类似，但时间尺度要短得多。我们发现，雄性的性和社交活动在大约两周的时间内发生了深刻的变化。这种迄今为止尚未描述的发情行为与雄激素浓度的变化密切相关，似乎是由其驱动的。性和社交活动变化的短时间尺度可能解释了为什么雄性长颈鹿在野外的支配地位和生殖状态似乎不稳定。
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